A magnetic particle testing device and testing method for pressure vessel welds

Abstract

The application discloses a kind of magnetic powder detection device and detection method for pressure vessel weld, belong to the technical field of weld detection, the magnetic powder detection device includes moving track, rack is equipped on moving track, the sliding assembly is set on the two side walls of moving track, one side sliding assembly is fixedly connected with motor, output shaft of motor is fixedly connected with rotating shaft, gear tooth is set between sliding assembly, gear tooth is engaged with rack of moving track, rotating shaft is successively penetrated one side sliding assembly, gear tooth, the other side sliding assembly and detection frame, the both sides of detection frame inner wall are fixedly connected with magnetic block, detection frame upper portion is fixedly connected with spray tank, rotating shaft is provided with push rod, sliding assembly close to detection frame is connected with swing lever, torsion spring is set between sliding assembly and swing lever, push rod can be contacted with swing lever.The magnetic powder detection device can more quickly and effectively detect the weld of pressure vessel, and will not cause damage to pressure vessel, to effectively improve detection efficiency.

Description

Technical Field

[0001] This invention belongs to the field of weld inspection technology, specifically relating to a magnetic particle inspection device and method for pressure vessel welds. Background Technology

[0002] Pressure vessels are increasingly used in modern industry. Due to the size of pressure vessels and the conditions of use, welding technology is an indispensable processing technology. Local defects are inevitable during the welding process. In order to ensure safe use and service life, the inspection of welds is extremely important in the inspection of pressure vessels.

[0003] Currently, visual inspection or radiographic inspection is the most common methods for inspecting welds on pressure vessels. Visual inspection involves workers manually examining the welds, but this method suffers from significant omissions, low efficiency, and high manpower consumption. While radiographic inspection can obtain images of defects, it is also prone to missing cracks in pressure vessels and is relatively slow. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a magnetic particle testing device and method for pressure vessel welds, which can detect pressure vessel welds more quickly and effectively without damaging the pressure vessel, thereby effectively improving the testing efficiency.

[0005] To achieve the above objectives, the present invention employs the following technical solution: This invention provides a magnetic particle inspection device for pressure vessel welds, comprising a moving track with a rack on it, sliding components on both side walls of the moving track, a motor fixedly connected to one side sliding component, a rotating shaft fixedly connected to the output shaft of the motor, a missing gear between the sliding components meshing with the rack of the moving track, the rotating shaft sequentially passing through one side sliding component, the missing gear, the other side sliding component, and a testing frame, magnetic blocks fixedly connected to both sides of the inner wall of the testing frame, a spray can fixedly connected to the upper part of the testing frame, a push rod on the rotating shaft, a rocker arm connected to the sliding component near the testing frame, a torsion spring between the sliding component and the rocker arm, and the push rod capable of contacting the rocker arm.

[0006] In one embodiment, the moving track includes a vertical support portion and a U-shaped track located above the vertical support portion. A rack is provided at the center line of the U-shaped track, and a first notch and a second notch are respectively provided on the two side walls of the U-shaped track. The sliding component includes a limiting block and a slider, which are slidably connected to the moving track.

[0007] In one embodiment, the limiting block is an H-shaped block, the limiting block is mounted on the first notch, and the limiting block can slide along the first notch; One side of the limiting block is opposite to the slider, and the lower edge of the other side is fixedly connected to a base, with the motor positioned above the base.

[0008] In one embodiment, the slider is an H-shaped block, the slider is mounted on the second notch, and the slider can slide along the second notch; One side of the slider is opposite to the limiting block, and the rocker arm is disposed on the other side of the slider, with the rocker arm perpendicular to the slider.

[0009] In one embodiment, the moving track is disposed above the base plate, and the base plate is provided with two limiting strips for limiting the pressure vessel.

[0010] In one embodiment, the testing frame is provided with a button.

[0011] In one embodiment, a rotating block is provided on the side of the rotating shaft near the testing frame, and the rotating block can contact the button of the testing frame; The rotating block is circular in shape and has a notch.

[0012] In one embodiment, the rocker arm includes a main rod, a contact rod, and a pressing rod. One end of the main rod is connected to a sliding assembly. The contact rod is disposed at one end of the main rod near the sliding assembly and is perpendicular to the main rod. The contact rod is used to contact the push rod. The pressing rod is disposed at the other end near the main rod and is perpendicular to the main rod. The pressing rod is used to press the nozzle of the spray can. The torsion spring is mounted on the main rod between the sliding assembly and the contact rod. Each end of the torsion spring has a protruding metal rod, one end of which is fixed to the sliding assembly, and the other end is engaged with the contact rod extending from the rocker arm.

[0013] In one embodiment, the push rod includes a first rod, one end of which is connected to a rotation shaft and is perpendicular to the rotation shaft, and the other end of which is connected to a second rod perpendicular to the first rod.

[0014] The present invention also provides a magnetic particle inspection method for pressure vessel welds, based on the above-mentioned magnetic particle inspection device for pressure vessel welds, comprising the following steps: S1: Start the motor and the testing frame. The motor rotation drives the rotating shaft and the missing gear to rotate. The push rod on the rotating shaft pushes the rocker arm on the sliding assembly to swing. The torsion spring is twisted, and the rocker arm swings. The rocker arm squeezes the spray can to spray magnetic powder onto the surface of the pressure vessel. The magnetic powder is magnetically attracted to the surface of the pressure vessel. The magnetic resistance at the crack increases, and the magnetic block cannot attract the magnetic powder inside the crack. At the same time, the rotating shaft rotates and drives the missing gear to move along the moving track. The missing gear continues to rotate and disengages from the rack of the moving track. At the same time, the rotating shaft continues to rotate and disengages from the rocker arm. The torsion spring resets and drives the rocker arm to swing in the opposite direction. The rocker arm swings in the opposite direction and disengages from the spray can. S2: Repeat S1 to make the missing gear move intermittently along the moving track and drive the spray can to spray magnetic powder intermittently. Observe the magnetic powder accumulation and quickly identify the cracks in the pressure vessel.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a magnetic particle inspection device and method for pressure vessel welds. The magnetic particle inspection device uses a motor to drive a rotating shaft to rotate and push a rocker arm to swing, squeezing a spray can and spraying magnetic powder onto the surface of the pressure vessel. The magnetic powder adheres to the surface of the pressure vessel. Simultaneously, the intermittent movement of a magnetic block intermittently attracts the magnetic powder on the pressure vessel surface. If there is a crack, the magnetic powder will adhere to the crack within the pressure vessel. The increased magnetic resistance in the crack prevents the magnetic block from attracting the magnetic powder in the crack, thus exposing the crack with accumulated magnetic powder to the surface of the pressure vessel. This allows for rapid detection of damage to the pressure vessel and improves inspection efficiency.

[0016] Furthermore, the present invention drives the rotating block to rotate by rotating the rotating shaft. The rotation of the rotating block will press the button, which will power on the detection frame, thus eliminating the need for manual activation of the detection frame and effectively improving detection efficiency. Attached Figure Description

[0017] Figure 1 This is a first three-dimensional structural schematic diagram of the magnetic particle inspection device for pressure vessel welds provided by the present invention.

[0018] Figure 2 This is a schematic diagram of a second three-dimensional structure of the magnetic particle inspection device for pressure vessel welds provided by the present invention.

[0019] Figure 3 This is a partial three-dimensional structural diagram of the magnetic particle inspection device for pressure vessel welds provided by the present invention.

[0020] Figure 4 This is a partial three-dimensional structural diagram of the magnetic particle inspection device for pressure vessel welds provided by the present invention.

[0021] The components are: 1-base plate; 2-moving track; 3-motor; 4-rotating shaft; 5-limiting block; 6-slider; 7-detection frame; 8-magnetic block; 9-spray can; 10-swinging rod; 11-torsion spring; 12-missing gear; 13-rotating block. Detailed Implementation

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

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, welding, and bonding that are mature in the prior art, and will not be described in detail here.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings: See Figures 1 to 4 This invention provides a magnetic particle testing device and method for pressure vessel welds. Specifically, the magnetic particle testing device is a non-destructive testing equipment for pressure vessel welds with good testing effect. It can test the welds of pressure vessels more quickly and effectively without damaging the pressure vessel, thereby effectively improving the testing efficiency.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the magnetic particle inspection device for pressure vessel welds includes a moving track 2, a sliding assembly, a motor 3, a rotating shaft 4, an inspection frame 7, a missing gear 12, a push rod, a rocker arm 10, and a torsion spring 11. The system comprises: a moving track 2 with a rack; sliding components on both sides of the moving track 2; a motor 3 fixedly connected to one side of the sliding component, with its output shaft fixedly connected to a rotating shaft 4; a gear 12 positioned between the sliding components and meshing with the rack of the moving track 2; a rotating shaft 4 passing sequentially through one side of the sliding component, the gear 12, the other side of the sliding component, and the detection frame 7; a detection frame 7 with magnetic blocks 8 fixedly connected to both sides of its inner wall and a spray can 9 fixedly connected to its top; a push rod on the rotating shaft 4; a rocker arm 10 connected to the sliding component near the detection frame 7; and a torsion spring 11 positioned between the sliding component and the rocker arm 10.

[0027] Furthermore, such as Figure 1 and Figure 2 As shown, the movable track 2 includes a vertical support section and a U-shaped track located above the vertical support section. A rack is positioned at the center line of the U-shaped track, and a first notch and a second notch are respectively formed on the two side walls of the U-shaped track.

[0028] like Figures 1 to 4 As shown, the sliding component includes a limiting block 5 and a slider 6, which are slidably connected to the moving track 2.

[0029] More specifically, the limiting block 5 is H-shaped and is mounted on the first notch of the U-shaped track of the moving track 2, and can slide along the first notch; the limiting block 5 and the slider 6 are arranged opposite to each other, and the two together constitute a sliding component. One side of the limiting block 5 is opposite to the slider 6, and the lower edge of the other side is fixedly connected to a base. The base provides an installation position for the motor 3, and the motor 3 is set above the base.

[0030] The limiting block 5 is mounted in an H-shape and slidably connected to the first notch of the U-shaped track of the moving track 2. The motor 3 is mounted above the base, forming part of the sliding assembly, and drives the rotating shaft 4 to rotate.

[0031] More specifically, slider 6, which is H-shaped, is mounted on the second notch of the U-shaped track of the moving track 2 and can slide along the second notch; limiting block 5 is arranged opposite to slider 6, and the two together constitute the sliding assembly. One side of slider 6 is opposite to limiting block 5, and rocker arm 10 is arranged on the other side of slider 6, perpendicular to slider 6.

[0032] The slider 6 is mounted in an H-shape and slidably connected to the second notch of the U-shaped track of the moving track 2. The limiting block 5 is positioned opposite to the slider 6, together enabling the sliding component to slide on the moving track 2.

[0033] Furthermore, a base plate 1 is provided below the moving track 2; the base plate 1 is provided with two limit strips, which are used to limit the pressure vessel.

[0034] Furthermore, such as Figure 2 , 3 As shown, the testing frame 7 is equipped with a button, and a rotating block 13 is provided on the side of the rotating shaft 4 near the testing frame 7. The rotating block 13 is designed to contact the button on the testing frame 7 during rotation. The rotating block 13 is annular in shape and has a notch to match the shape of the button.

[0035] Furthermore, such as Figure 1 , 4 As shown, the rocker arm 10 consists of a main rod, a contact rod, and a pressing rod. One end of the main rod is connected to the slider 6 of the sliding assembly. The contact rod is located at the end of the main rod near the slider 6 and is perpendicular to the main rod, used to contact the push rod. The pressing rod is located at the other end of the main rod and is perpendicular to the main rod, used to press the nozzle of the spray can 9.

[0036] Furthermore, the torsion spring 11 is set on the main rod between the slider 6 of the sliding assembly and the contact rod. Each end of the torsion spring 11 has a protruding metal rod. One end is fixed on the slider 6, and the other end is locked on the contact rod extending from the rocker arm 10. Once the torsion spring 11 is tightened and reset, the metal rod will limit its rebound distance.

[0037] The rocker arm 10 is a single integrated component, with one end of its main rod connected to the slider 6 of the sliding component, enabling the rocker arm to be mounted and swing on the slider 6. A contact rod, also part of the rocker arm 10, is vertically positioned at the end of the main rod near the slider 6, and is used to contact the push rod during the swinging of the rocker arm 10. A pressing rod, also part of the rocker arm 10 but located at the other end of the main rod, is used to press the nozzle of the spray can 9 when needed.

[0038] The torsion spring 11 is installed on the main rod between the slider 6 of the sliding assembly and the contact rod. If the rocker arm 10 is pushed to rotate, the torsion spring 11 begins to store force and generates torque accordingly, providing restoring force or torque for the swing of the rocker arm 10, ensuring that the rocker arm 10 can return to its initial position or maintain a certain swing angle after being subjected to external force.

[0039] Furthermore, such as Figure 3 , 4 As shown, the push rod consists of a first rod and a second rod. One end of the first rod is connected to the rotation shaft 4 and is perpendicular to the rotation shaft 4. The other end of the second rod is connected to the first rod and is perpendicular to the first rod.

[0040] The push rod, as a whole, consists of a first rod and a second rod. One end of the first rod is connected to the rotating shaft 4, ensuring that the first rod can move with the rotation of the rotating shaft 4. The first rod is perpendicular to the rotating shaft 4, meaning that the direction of movement of the first rod will be perpendicular to the rotation axis of the rotating shaft 4. The second rod is connected to the other end of the first rod and is also perpendicular to the first rod, thus forming an L-shaped push rod structure. This design allows the push rod to trigger other components when it moves.

[0041] The present invention also provides a magnetic particle inspection method for pressure vessel welds, based on the above-mentioned magnetic particle inspection device for pressure vessel welds, comprising the following steps: S1: Start motor 3 and detection frame 7. Motor 3 rotates, driving rotating shaft 4 and missing gear 12 to rotate. Push rod on rotating shaft 4 pushes rocker arm 10 on sliding assembly to swing. Torsion spring 11 is twisted, rocker arm 10 swings, rocker arm 10 squeezes spray can 9 to spray magnetic powder onto the surface of pressure vessel. Magnetic powder is magnetically attracted to the surface of pressure vessel. Magnetic resistance increases at cracks, and magnetic block 8 cannot attract magnetic powder inside cracks. At the same time, rotating shaft 4 rotates, driving missing gear 12 to move along moving track 2. Missing gear 12 continues to rotate and disengages from rack on moving track 2. Simultaneously, rotating shaft 4 continues to rotate and disengages from rocker arm 10. Torsion spring 11 resets, driving rocker arm 10 to swing in the opposite direction. Rocker arm 10 swings in the opposite direction and disengages from spray can 9. S2: Repeat S1 to make the missing gear 12 move intermittently along the moving track 2, and drive the spray can 9 to spray magnetic powder intermittently. Observe the magnetic powder accumulation and quickly identify the cracks in the pressure vessel.

[0042] Example 1: The magnetic particle inspection device for pressure vessel welds provided in this example has the following technical solution: This pressure vessel weld non-destructive testing equipment with good testing effect includes a base plate 1, a moving track 2, a motor 3, a rotating shaft 4, a limit block 5, a slider 6, a testing frame 7, a magnetic block 8, a spray can 9, a rocker arm 10, a torsion spring 11, and a missing gear 12.

[0043] A movable track 2 is fixedly connected to the base plate 1. Two limit strips are provided on the base plate 1. A rack is provided on the movable track 2. A limit block 5 is slidably connected to one side of the movable track 2. A motor 3 is fixedly connected to the limit block 5. A rotating shaft 4 is fixedly connected to the output shaft of the motor 3. The rotating shaft 4 is rotatably connected to the limit block 5. A slider 6 is slidably connected to the other side of the movable track 2. The rotating shaft 4 is rotatably connected to the slider 6. A detection frame 7 is rotatably connected to the rotating shaft 4. Magnetic blocks 8 are fixedly connected to both sides of the inner wall of the detection frame 7. A spray can 9 is fixedly connected to the upper part of the detection frame 7. A rocker arm 10 is rotatably connected to the slider 6. A torsion spring 11 is connected between the slider 6 and the rocker arm 10. A missing gear 12 is fixedly connected to the rotating shaft 4. The missing gear 12 is located between the limit block 5 and the slider 6. The missing gear 12 meshes with the rack of the movable track 2. A push rod is provided on the rotating shaft 4.

[0044] A U-shaped track is supported above the vertical support of the moving track 2. A first and second notch on the U-shaped track allow for sliding connection between the limiting block 5 and the slider 6, respectively. A rack is positioned along the centerline of the U-shaped track and meshes with the gear 12 for transmission. The limiting block 5 and the slider 6 form a sliding assembly, positioned opposite each other and slidably connected to the moving track 2 via the first and second notches. The gear 12 is positioned between the limiting block 5 and the slider 6. The limiting block 5 is mounted on the first notch and is fixedly connected to the motor 3 via a base. The output shaft of the motor 3 drives the rotating shaft 4 to rotate. The slider 6 is mounted on the second notch and interacts with the push rod via the rocker arm 10, enabling the rocker arm 10 to swing.

[0045] The rotating shaft 4 passes through the limiting block 5, the missing gear 12, the slider 6 and the detection frame 7 in sequence, forming the core transmission component of the entire detection device.

[0046] The testing frame 7 is fixed to the rotating shaft 4 by a rotating connection. The magnetic blocks 8 on both sides of the inner wall are used to adsorb magnetic powder, and the spray can 9 fixed at the top is used to spray magnetic powder.

[0047] The push rod consists of a first rod and a second rod. Its L-shaped structure allows it to push the rocker arm 10 to swing when the rotating shaft 4 rotates.

[0048] One end of the main rod of the rocker arm 10 is connected to the slider 6. The contact rod and the pressing rod are respectively vertically set at both ends of the main rod, and are used to contact the push rod and press the nozzle of the spray can 9.

[0049] Torsion spring 11 is mounted on the main rod between slider 6 and contact rod to provide the necessary restoring force or torque for the swing of rocker arm 10.

[0050] The base plate 1 is located below the moving track 2, and two limit bars are installed on it to limit the pressure vessel.

[0051] Example 2 Based on Embodiment 1 above, this embodiment provides a magnetic particle inspection device for pressure vessel welds, the technical solution of which is as follows: This pressure vessel weld non-destructive testing equipment has good detection performance, such as Figures 1-4 As shown, it includes a base plate 1, a moving track 2, a motor 3, a rotating shaft 4, a limit block 5, a slider 6, a detection frame 7, a magnetic block 8, a spray can 9, a rocker arm 10, a torsion spring 11, and a missing gear 12.

[0052] A movable track 2 is bolted to the base plate 1. A rack is mounted on the movable track 2. A limit block 5 is slidably connected to one side of the movable track 2. The base of a motor 3 is bolted to the limit block 5. A rotating shaft 4 is bolted to the output shaft of the motor 3. The rotating shaft 4 is rotatably connected to the limit block 5. The rotating shaft 4 is horizontally positioned. A slider 6 is slidably connected to the other side of the movable track 2. The rotating shaft 4 is rotatably connected to the slider 6. A detection frame 7 is rotatably connected to the rotating shaft 4. Magnetic blocks 8 are welded to both sides of the inner wall of the detection frame 7. A spray can 9 is riveted to the upper part of the detection frame 7. A rocker arm 10 is rotatably connected to the slider 6. A torsion spring 11 is connected between the slider 6 and the rocker arm 10. The torsion spring 11 is sleeved on the rocker arm 10. A missing gear 12 is connected to the rotating shaft 4 via a flat key. The missing gear 12 is located between the limit block 5 and the slider 6. The missing gear 12 meshes with the rack of the movable track 2.

[0053] Initially, the spray can 9 is filled with magnetic powder. In actual operation, the operator places the pressure vessel between the two limiting strips of the base plate 1. The two limiting strips of the base plate 1 limit the pressure vessel. Then, the operator starts the motor 3 and presses the button on the detection frame 7 to activate the detection frame 7 and increase the magnetic force of the two magnetic blocks 8. The output shaft of the motor 3 rotates, which drives the rotating shaft 4 to rotate. The rotation of the rotating shaft 4 causes the push rod to contact the rocker arm 10, pushing the rocker arm 10 to swing. The torsion spring 11 is twisted, and the swinging of the rocker arm 10 squeezes the spray can 9. 9. When squeezed, magnetic powder is sprayed onto the surface of the pressure vessel. The magnetic powder is attracted to the surface of the pressure vessel. If there are cracks on the surface of the pressure vessel, the magnetic powder will be attracted into the cracks. Magnetic leakage will occur between the cracks, increasing the magnetic resistance within them. Simultaneously, the rotation of the rotating shaft 4 will drive the missing gear 12 to rotate. As the missing gear 12 rotates, it will move along the rack of the moving track 2. As the missing gear 12 continues to rotate, it will disengage from the rack of the moving track 2. At the same time, the rotating shaft 4 will continue to rotate and disengage from the rocker arm 10. When the torsion spring 11 resets, it causes the rocker arm 10 to swing in the opposite direction. The rocker arm 10 then disengages from the spray can 9. The missing gear 12 continues to rotate and re-engages with the rack of the moving track 2. Simultaneously, the rotating shaft 4 continues to rotate and re-engages with the rocker arm 10. This process repeats, causing the missing gear 12 to move intermittently, resulting in the spray can 9 intermittently spraying magnetic powder. The intermittent movement of the missing gear 12 causes the limit block 5, motor 3, rotating shaft 4, slider 6, detection frame 7, magnetic block 8, spray can 9, and rocker arm 10 to move intermittently together. Magnetic powder is intermittently sprayed onto the surface of the pressure vessel, allowing more magnetic powder to be adsorbed and accumulated in cracks. Simultaneously, the intermittent movement of two magnetic blocks 8 intermittently adsorbs the magnetic powder on the pressure vessel surface. If the pressure vessel has cracks, the increased magnetic resistance within the cracks prevents the two magnetic blocks 8 from adsorbing the magnetic powder, exposing the accumulated magnetic powder to the pressure vessel surface. This allows workers to quickly detect cracks on the pressure vessel, thereby rapidly assessing any damage and improving quality inspection efficiency.

[0054] After the pressure vessel inspection is completed, the operator places the next pressure vessel between the two limit bars on the base plate 1, and then adjusts the output shaft of motor 3 to rotate in the reverse direction. The reverse rotation of the output shaft of motor 3 will drive the rotating shaft 4 to rotate in the reverse direction, which will drive the missing gear 12 to rotate in the reverse direction. The reverse rotation of the missing gear 12 will move intermittently along the rack of the moving track 2, thereby causing the limit block 5, motor 3, rotating shaft 4, slider 6, inspection frame 7, magnetic block 8, spray can 9 and rocker arm 10 to intermittently reset together, and then inspect the next pressure vessel.

[0055] Example 3 Based on the above embodiments 1 and 2, the testing frame 7 is provided with a button, and the magnetic particle testing device also includes a rotating block 13. The rotating block 13 is disposed on the side of the rotating shaft 4 near the testing frame 7, and its annular structure and notch design enable it to precisely match and contact the button of the testing frame 7.

[0056] The rotation of the rotating shaft 4 will drive the rotating block 13 to rotate. The rotation of the rotating block 13 will press the button of the detection frame 7. The press of the button will energize the detection frame 7, thereby eliminating the need for manual activation of the detection frame 7 and improving detection efficiency.

[0057] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A magnetic particle inspection device for weld seams of pressure vessels, characterized in that, The device includes a moving track (2), on which a rack is provided. Sliding components are provided on both sides of the moving track (2). A motor (3) is fixedly connected to one side of the sliding component. A rotating shaft (4) is fixedly connected to the output shaft of the motor (3). A missing gear (12) is provided between the sliding components. The missing gear (12) meshes with the rack of the moving track (2). The rotating shaft (4) passes through one side of the sliding component, the missing gear (12), the other side of the sliding component, and the detection frame (7) in sequence. Magnetic blocks (8) are fixedly connected to both sides of the inner wall of the detection frame (7). A spray can (9) is fixedly connected to the upper part of the detection frame (7). A push rod is provided on the rotating shaft (4). A rocker arm (10) is connected to the sliding component near the detection frame (7). A torsion spring (11) is provided between the sliding component and the rocker arm (10). The push rod can contact the rocker arm (10).

2. The magnetic particle inspection device for pressure vessel welds according to claim 1, characterized in that, The moving track (2) includes a vertical support part and a U-shaped track located above the vertical support part. A rack is provided at the center line of the U-shaped track, and a first notch and a second notch are respectively provided on the two side walls of the U-shaped track. The sliding component includes a limiting block (5) and a slider (6), which are slidably connected to the moving track (2).

3. A magnetic particle inspection device for pressure vessel welds according to claim 2, characterized in that, The limiting block (5) is an H-shaped block, the limiting block (5) is mounted on the first notch, and the limiting block (5) can slide along the first notch; One side of the limiting block (5) is opposite to the slider (6), and the lower edge of the other side is fixedly connected to the base. The motor (3) is located above the base.

4. A magnetic particle inspection device for pressure vessel welds according to claim 2, characterized in that, The slider (6) is an H-shaped block, the slider (6) is mounted on the second notch, and the slider (6) can slide along the second notch; One side of the slider (6) is opposite to the limiting block (5), and the rocker arm (10) is set on the other side of the slider (6). The rocker arm (10) is perpendicular to the slider (6).

5. A magnetic particle inspection device for pressure vessel welds according to claim 1, characterized in that, The moving track (2) is set above the base plate (1), and the base plate (1) is provided with two limiting strips, which are used to limit the pressure vessel.

6. A magnetic particle inspection device for pressure vessel welds according to claim 1, characterized in that, The testing frame (7) is equipped with a button.

7. A magnetic particle inspection device for pressure vessel welds according to claim 6, characterized in that, A rotating block (13) is provided on the side of the rotating shaft (4) near the detection frame (7), and the rotating block (13) can contact the button of the detection frame (7); The rotating block (13) is circular in shape and has a notch.

8. A magnetic particle inspection device for pressure vessel welds according to claim 1, characterized in that, The rocker arm (10) includes a main rod, a contact rod, and a pressing rod. One end of the main rod is connected to the sliding assembly. The contact rod is located at one end of the main rod near the sliding assembly. The contact rod is perpendicular to the main rod and is used to contact the push rod. The pressing rod is located at the other end of the main rod. The pressing rod is perpendicular to the main rod and is used to press the nozzle of the spray can (9). The torsion spring (11) is set on the main rod between the sliding assembly and the contact rod. The torsion spring (11) has a protruding metal rod at each end. One end is fixed on the sliding assembly, and the other end is stuck on the contact rod extending from the rocker arm (10).

9. A magnetic particle inspection device for pressure vessel welds according to claim 1, characterized in that, The push rod includes a first rod, one end of which is connected to the rotating shaft (4), the first rod is perpendicular to the rotating shaft (4), and the other end of the first rod is connected to a second rod perpendicular to the first rod.

10. A magnetic particle inspection method for welds in pressure vessels, characterized in that, The magnetic particle inspection device for pressure vessel welds according to any one of claims 1 to 9 includes the following steps: S1: Start the motor (3) and the test frame (7). The motor (3) rotates and drives the rotating shaft (4) and the missing gear (12) to rotate. The push rod on the rotating shaft (4) pushes the rocker arm (10) on the sliding assembly to swing. The torsion spring (11) is twisted, and the rocker arm (10) swings. The rocker arm (10) squeezes the spray can (9) to spray magnetic powder onto the surface of the pressure vessel. The magnetic powder is magnetically attracted to the surface of the pressure vessel. The magnetic resistance at the crack increases, and the magnetic block (8) cannot attract the magnetic powder in the crack. At the same time, the rotating shaft (4) rotates and drives the missing gear (12) to move along the moving track (2). The missing gear (12) continues to rotate and disengages from the rack of the moving track (2). At the same time, the rotating shaft (4) continues to rotate and disengages from the rocker arm (10). The torsion spring (11) resets and drives the rocker arm (10) to swing in the opposite direction. The rocker arm (10) swings in the opposite direction and disengages from the spray can (9). S2: Repeat S1 to make the missing gear (12) move intermittently along the moving track (2) and drive the spray can (9) to spray magnetic powder intermittently. Observe the magnetic powder accumulation and quickly identify the pressure vessel crack.

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