Device for detecting socket fillet welds

Abstract

The present invention discloses a device for detecting fillet welds of a pipe socket, comprising a drive device, a transmission ring, a transmission wheel, and a preset function device. The transmission ring can be sleeved on the outside of the pipe, and the inner side of the transmission ring meshes with the outer side of the transmission wheel. The drive device is connected to the transmission wheel and is used to drive the transmission wheel to rotate, so that the transmission wheel drives the transmission ring to rotate around the pipe, and the preset function device is connected to the transmission ring. The rotation of the transmission ring around the pipe can drive the preset function device to move around the pipe, so that the preset function device can move around the pipe and perform grinding, cleaning, and detection on various circumferential positions of the pipe socket fillet welds. The device designed by the present invention can be used to achieve grinding, cleaning, and detection of pipe socket fillet welds in narrow spaces, filling the blind spots for grinding and detection of such parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of non-destructive testing of thermal power plants, in particular to a device for detecting nozzle seat fillet welds. BACKGROUND

[0002] According to public data, the proportion of thermal power generation in total power generation in China in 2021 was as high as 71%, and coal-fired thermal power units are still the absolute main force of current power generation in China. Thermal power units include various levels of headers of superheaters, reheaters, economizers, and water-cooled walls. A unit often contains more than ten or even more headers. Along different angles of the header cylinder, multiple rows of heating surface nozzle seats are designed, and each header contains hundreds to thousands of heating surface tube row nozzle seats.

[0003] Since commissioning and with the continuous extension of the running time, the nozzle seat fillet welds of the header heating surface tube row often crack and fail due to factors such as original material defects, poor manufacturing and welding processes, maintenance repair welding, and technical transformation, and fatigue damage accumulation. After combing the unit failure events in recent years, many units have been non-plannedly shut down due to cracking and leakage of the nozzle seat fillet welds of the header tube row, which has seriously affected the stable operation of the unit and caused great economic and social benefit losses to power generation enterprises.

[0004] The nozzle seat fillet welds of the header have large differences in state and safety due to differences or differences in operating environment, design and manufacturing, installation and maintenance, etc. According to the requirements of standards such as DL / T438-2016 "Metal Technology Supervision Regulations for Thermal Power Plants", during unit A maintenance, non-destructive testing sampling inspection of the nozzle seat fillet welds of the header heating surface and the like needs to be carried out according to a certain proportion (such as 20%) or quantity, and 100% detection of all tube seat fillet welds is completed in 3-4 A-level maintenance.

[0005] For non-destructive testing and hidden trouble investigation of the nozzle seat fillet welds of the header, according to the existing technology, macroscopic examination + penetration or magnetic powder detection is generally used, and ultrasonic or phased array detection is performed when necessary. For the nozzle seat welds in the narrow space of the header, if the above existing scheme is used for detection, after many years of practice, the following problems and limitations are found:

[0006] 1) The fillet welds cannot be effectively polished, and the weld surface finish is poor.

[0007] After the service of the weld header, the surface of the header often has thick oxide skin, floating rust and obvious unevenness due to high temperature. The above detection methods have high requirements for the smoothness of the detected parts. The detection rate of defects is often seriously affected by the poor surface smoothness, which easily causes missed detection. At present, the surface is usually cleaned by an angle grinder and sandpaper, and the metal luster is missed. Figure 1 As shown in FIG. 1, seven rows of tubes, i.e. heating surface connecting pipes 11, are connected to the header 10. The existing electric polishing tool cannot be used to polish the fillet weld in the narrow space. Manual sandpaper polishing is used, which has low polishing efficiency, high labor intensity, large number of welds, long polishing time, and the required construction period is seriously beyond the plan. The quality of manual sandpaper polishing is generally poor, which seriously affects the detection sensitivity and detection rate.

[0008] 2) It is difficult to carry out detection in a narrow space.

[0009] The fillet weld of the header row connecting pipe seat is also arranged densely, and the space is narrow. During the detection process, the handheld detection instrument cannot or is difficult to approach the detected surface, the detection agent cannot be applied, the detected trace and result cannot be observed in real time during the detection process, the detection efficiency is low, the work intensity is high, and misjudgment is easy.

[0010] From the above situation, the fillet weld of the connecting pipe in the header row pipe seat and away from the two side heads in the narrow space cannot be effectively detected and evaluated due to the dense arrangement of the pipe seat and the narrow space. The undetected fillet weld accounts for 33% to 67%. This part of the weld is in a state of undetectable risk, which easily leads to weld failure and leakage, and repeated unplanned shutdown of the unit. The above situation is a common and difficult problem that needs to be solved by each thermal power generation enterprise. SUMMARY

[0011] The purpose of the present application is to provide a device for detecting the fillet weld of the connecting pipe seat, which can detect the fillet weld of the connecting pipe seat in a narrow space and fill the detection blind area.

[0012] To achieve the above purpose, the present application provides the following technical solutions:

[0013] A device for detecting the fillet weld of the connecting pipe seat, comprising a driving device, a transmission ring, a transmission wheel and a preset function device.

[0014] The transmission ring can be sleeved on the outside of the connecting pipe, the inner side of the transmission ring is engaged with the outer side of the transmission wheel, the driving device is connected with the transmission wheel for driving the transmission wheel to rotate, the transmission wheel drives the transmission ring to rotate around the connecting pipe, and the preset function device is connected with the transmission ring, so that the transmission ring drives the preset function device to move around the connecting pipe.

[0015] Optionally, the driving device comprises a first transmission rod, and the driving device is connected with the transmission wheel through the first transmission rod.

[0016] Optionally, a fixing ring is further included, the fixing ring can be sleeved on the outside of the connecting pipe, the fixing ring is provided with a cavity in communication in the circumferential direction of the fixing ring, and a ball is arranged in the cavity, one end of a preset component of the preset function device is connected with the transmission ring, and the other end of the preset component is connected with the ball.

[0017] Optionally, the preset function device comprises a second power output device and a polishing component, the second power output device is connected with the polishing component for outputting power to the polishing component, and the preset component comprises the second power output device.

[0018] Optionally, the second power output device is connected with one end of a second transmission rod, the other end of the second transmission rod is connected with one end of an elastic connecting piece, and the other end of the elastic connecting piece is connected with the polishing component.

[0019] Optionally, a fixing piece is arranged on the transmission ring, the fixing piece comprises a rotatable ball, the ball is connected with the preset function device, and the preset function device can rotate relative to the fixing piece.

[0020] Optionally, the preset function device comprises a cylinder and a magnetic field generating component, the cylinder is used for containing a preset liquid, a liquid inlet and a liquid outlet are arranged on the cylinder, and the magnetic field generating component is used for generating a magnetic field.

[0021] Optionally, an air compressor and a valve allowing air to enter the cylinder from the outside in one direction are arranged on the cylinder, and the air compressor is in communication with the valve.

[0022] Optionally, the magnetic field generating component comprises a first magnetic yoke and a second magnetic yoke which cross each other, an illuminating light source is arranged on the first magnetic yoke, and a camera is arranged on the second magnetic yoke.

[0023] Optionally, a supporting ring and a supporting frame are further included, the supporting ring is sleeved on the outside of the connecting pipe, one end of the supporting frame is connected with the supporting ring, and the other end of the supporting frame is supported on the driving device.

[0024] Optionally, an electric slip ring is arranged on the transmission ring, the electric slip ring is arranged on the outer circumferential surface of the transmission ring, is fixedly connected with the transmission ring, one end of the electric slip ring is electrically connected with the preset function device, and the other end is connected with a power supply system.

[0025] From the above technical solution, the device for detecting the welding seam of the pipe seat provided by the application comprises a driving device, a transmission ring, a transmission wheel and a preset function device, the transmission ring can be sleeved on the outside of the pipe, the inner side surface of the transmission ring is engaged with the outer side surface of the transmission wheel, the driving device is connected with the transmission wheel and is used for driving the transmission wheel to rotate, so that the transmission wheel drives the transmission ring to rotate around the center line of the pipe, the preset function device is connected with the transmission ring, and the transmission ring drives the preset function device to rotate around the pipe, so that the preset function device can move around the pipe and process each position of the pipe seat angle. The device for detecting the welding seam of the pipe seat can be used for detecting the welding seam of the pipe seat in a narrow space and fills the detection blind area. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 A schematic diagram of a typical heating surface pipe of a header of a thermal power generating unit;

[0028] Figure 2 A schematic diagram of a polishing and cleaning device for detecting the welding seam of the pipe seat provided by an embodiment of the application;

[0029] Figure 3 A schematic diagram of the transmission ring and the transmission wheel of an embodiment of the application;

[0030] Figure 4 A schematic diagram of a detection device for detecting the welding seam of the pipe seat provided by an embodiment of the application;

[0031] Figure 5 A schematic diagram of a device for detecting the welding seam in the device for detecting the welding seam of the pipe seat provided by an embodiment of the application;

[0032] Figure 6 A schematic diagram of the transmission ring and the electric slip ring of an embodiment of the application;

[0033] Figure 7 A schematic diagram of the power supply system of an embodiment of the application;

[0034] Figure 8 The schematic diagram of the working interface of the mobile phone APP of an embodiment of the present application.

[0035] The reference signs in the drawings of the specification include:

[0036] 10- header, 11- heated surface connection pipe;

[0037] 100- connection pipe, 101- transmission ring, 102- transmission wheel, 103- first transmission rod, 104- first power output device, 105- fixed ring, 106- ball, 107- support ring, 108- support frame, 109- second power output device, 110- polishing part, 111- elastic connecting piece, 112- transmission ring buckle, 113- fixed ring buckle;

[0038] 201- magnetic field generating part, 202- cylinder, 203- third transmission rod, 204- fixing piece, 205- ball, 206- first magnetic yoke, 207- second magnetic yoke, 208- liquid inlet, 209- air compressor, 210- observation window, 211- corner transformer, 212- illumination light source, 213- camera device;

[0039] 300- electric slip ring, 301- positive electrode, 302- negative electrode, 303- input interface, 304- output interface, 305- switch. DETAILED DESCRIPTION

[0040] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0041] The present embodiment provides a device for detecting the nozzle seat fillet weld, which comprises a driving device, a transmission ring, a transmission wheel and a preset function device.

[0042] The transmission ring can be sleeved on the outside of the nozzle, the inner side surface of the transmission ring is engaged with the outer side surface of the transmission wheel, the driving device is connected with the transmission wheel for driving the transmission wheel to rotate, so that the transmission wheel drives the transmission ring to rotate around the nozzle, and the preset function device is connected with the transmission ring, so that the transmission ring drives the preset function device to move around the nozzle.

[0043] The device can be used for detecting the nozzle seat corner weld. The transmission ring is sleeved on the outside of the nozzle. The driving device drives the transmission wheel to rotate. The inner side surface of the transmission ring is engaged with the outer side surface of the transmission wheel. The rotation of the transmission wheel can drive the transmission ring to rotate around the nozzle. The preset function device is connected with the transmission ring. The rotation of the transmission ring can drive the preset function device to move around the nozzle. The preset function device can move around the nozzle to process each position of the nozzle seat corner in the circumferential direction, so that the nozzle seat corner weld can be detected. The device for detecting the nozzle seat corner weld can be used for detecting the nozzle seat corner weld in a small space, and the detection blind area is filled.

[0044] The radial size of the transmission ring can be designed according to the radial size of the detected nozzle to ensure that the transmission ring can be sleeved on the nozzle. The inner side surface of the transmission ring can be provided with a gear slot. The outer side surface of the transmission wheel is provided with a gear slot. The gear slot on the inner side surface of the transmission ring is engaged with the gear slot on the outer side surface of the transmission wheel, so that the two can transmit power.

[0045] The driving device can support the transmission ring, so that the transmission ring is sleeved on the outside of the nozzle and can rotate around the nozzle under the driving of the transmission wheel. In this embodiment, the driving device transmits power to the transmission wheel to drive it to rotate in any manner. Alternatively, the driving device can include a first transmission rod. The driving device is connected with the transmission wheel through the first transmission rod, and the first transmission rod drives the transmission wheel to rotate. One end of the first transmission rod is connected with the transmission wheel, and the other end is connected with the driving device. The first transmission rod transmits power to the transmission wheel. In other embodiments, the driving device can also transmit power to the transmission wheel to drive it to rotate in other ways, such as through a gear. The driving device can also include a first power output device for outputting power to drive the transmission wheel to rotate. The first power output device can be, but is not limited to, a servo motor.

[0046] In some embodiments, the device can also include a fixed ring, which can be sleeved on the outside of the nozzle. The fixed ring is provided with a cavity which is in communication with the circumferential direction of the fixed ring. A ball is arranged in the cavity. One end of a preset component of the preset function device is connected with the transmission ring, and the other end of the preset component is connected with the ball. In this embodiment, the driving device drives the transmission wheel to rotate. The rotation of the transmission wheel drives the transmission ring to rotate around the nozzle. The transmission ring drives one end of the preset component of the preset function device to move. The other end of the preset component moves along the fixed ring through the ball, so that the preset function device moves around the nozzle. The fixed ring can be fixedly sleeved on the nozzle. The fixed synchronous structure of the preset function device is formed by the transmission ring and the fixed ring, so that the preset function device can be fixed and moved synchronously.

[0047] The radial dimension of the fixing ring can be designed according to the radial dimension of the pipe to be detected, so as to ensure that the fixing ring can be stably sleeved on the pipe. The fixing ring is provided with a cavity in communication along the circumference of the fixing ring, and the cavity forms a sliding rail for the movement of the ball, so that the ball can move along the circumference of the fixing ring, and the one end of the preset component of the preset functional device moves along the circumference of the fixing ring. In the embodiment, the connection mode of the ball and the preset component of the preset functional device is not limited, and optionally, a threaded hole can be arranged on the ball, and a screw rod is arranged on the preset component of the preset functional device, and the preset component of the preset functional device and the ball are fixedly connected through the connection of the screw rod and the threaded hole.

[0048] The device of the embodiment can be a polishing and cleaning device for pipe seat angle weld detection, and the preset functional device can be a device for polishing and cleaning the pipe seat angle. For example, refer to Figure 2 , Figure 2 A schematic diagram of a polishing and cleaning device for pipe seat angle weld detection is provided for an embodiment, as shown in the figure, the transmission ring 101 and the fixing ring 105 are sleeved on the outer side of the pipe 100 respectively, and the fixing ring 105 is closer to the detected part of the pipe 100 than the transmission ring 101, and the specific detected part is the pipe 100 seat angle weld.

[0049] The first power output device 104 is connected with one end of the first transmission rod 103, and the other end of the first transmission rod 103 is provided with a transmission wheel 102. For example, refer to Figure 3 , Figure 3 A schematic diagram of the transmission ring and the transmission wheel of an embodiment is shown, the inner side of the transmission ring 101 is provided with a tooth groove, and the outer side of the transmission wheel 102 is provided with a tooth groove, and the tooth groove on the inner side of the transmission ring 101 and the tooth groove on the outer side of the transmission wheel 102 are fully engaged, so that the rotation of the transmission wheel 102 can drive the transmission ring 101 to rotate around the center line of the pipe 100. For example, refer to Figure 2 The ball 106 is arranged in the fixing ring 105, one end of the preset component 109 of the preset functional device is connected with the transmission ring 101, and the other end of the preset component 109 is connected with the ball 106.

[0050] The preset functional device is a device for polishing and cleaning the pipe seat fillet weld of the butt joint pipe 100. In some embodiments, the preset functional device can include a second power output device and a polishing component, and the second power output device is connected to the polishing component to output power to the polishing component. The preset component includes the second power output device. In this embodiment, the type of the second power output device is not limited, which can be but is not limited to an electric motor. The specific structure of the polishing component is not limited, as long as it can polish the detected part of the pipe seat fillet weld of the butt joint pipe 100. Optionally, the polishing component can be a spherical abrasive disc, which can be a small spherical abrasive disc suitable for polishing the detected part in a small space on the butt joint pipe 100. For example, according to different weld specifications and polishing and detection requirements, the spherical abrasive disc can be designed with a diameter of 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, etc. and a fineness level of 100 mesh, 200 mesh, 320 mesh, 400 mesh, 600 mesh, etc.

[0051] Preferably, the second power output device is connected to one end of a second transmission rod, the other end of the second transmission rod is connected to one end of an elastic connecting piece, and the other end of the elastic connecting piece is connected to the polishing component. The second power output device and the polishing component are connected through the elastic connecting piece, and the elastic connecting piece has elasticity along its length direction, so that when the second power output device outputs power to the second transmission rod and the elastic connecting piece, the polishing component can have a certain pressure on the detected part, such as a certain pressure on the fillet weld of the butt joint pipe, to improve the polishing effect. The elastic connecting piece can be but is not limited to a spring. For reference Figure 2 As shown, the preset component is a second power output device 109, the second power output device 109 is connected to one end of a second transmission rod, the other end of the second transmission rod is connected to one end of an elastic connecting piece 111, and the other end of the elastic connecting piece 111 is connected to a polishing component 110. The elastic connecting piece 111 is a spring.

[0052] Optionally, the connection between the second power output device 109 and the ball 106 can be that a screw rod is arranged at the front end of the second power output device and is fixedly connected to the threaded hole of the ball 106. The ball 106 can be but is not limited to a steel ball.

[0053] Preferably, one end of the preset component of the preset functional device is detachably connected to the transmission ring 101, so that the preset functional device and the transmission ring 101 are easy to install and detach. In this embodiment, the detachable connection between the transmission ring 101 and the preset component of the preset functional device is not limited, and optionally, the two can be buckled connection, specifically, either of the transmission ring 101 and the preset component is provided with a clamping groove, and the other is provided with a clamping key, and the two are connected by clamping the clamping key in the clamping groove.

[0054] The preset component of the preset function device is the second power output device 109, which can be referred to as Figure 2 As shown, the rear end of the second power output device 109 is connected with the transmission ring 101, and the front end of the second power output device 109 is stably connected with the fixed ring 105 without relative movement. Based on the fixed synchronization structure formed by the transmission ring 101 and the fixed ring 105, the preset function device can be driven to rotate around the central axis of the connecting pipe 100.

[0055] Alternatively, the fixed ring 105 can include two half rings that are detachably connected, so as to facilitate the installation of the fixed ring 105 on the connecting pipe 100 (such as a heating surface connecting pipe) and facilitate disassembly, thereby improving work efficiency. The two half rings of the fixed ring 105 can be buckle type connection, which can be referred to as Figure 2 As shown, the fixed ring buckle 113 is arranged at the end of the half ring of the fixed ring 105, and the two half rings are connected through the fixed ring buckle 113. The fixed ring 105 can be a light metal ring.

[0056] Alternatively, the transmission ring 101 can include two half rings that are detachably connected, so as to facilitate the installation of the transmission ring 101 on the connecting pipe 100 (such as a heating surface connecting pipe) and facilitate disassembly, thereby improving work efficiency. The two half rings of the transmission ring 101 can be buckle type connection, which can be referred to as Figure 2 As shown, the transmission ring buckle 112 is arranged at the end of the half ring of the transmission ring 101, and the two half rings are connected through the transmission ring buckle 112. The transmission ring 101 can be a light metal ring.

[0057] In some embodiments, a fixing member is arranged on the transmission ring 101, and the fixing member includes a rotatable ball, which is connected with the preset function device, so that the preset function device is rotatable relative to the fixing member. By connecting the preset function device with the transmission ring 101 in this way, the preset function device can rotate to some extent, and it is more flexible when processing the detected part of the connecting pipe 100.

[0058] The device of the embodiment can be a detection device for detecting the fillet weld of a connecting pipe seat, wherein the preset function device can be a device for detecting the fillet weld of the connecting pipe seat. In some embodiments, the preset function device includes a cylinder for containing a preset liquid, a liquid inlet and a liquid outlet are arranged on the cylinder, and a magnetic field generating component is arranged on the cylinder for generating a magnetic field. For example, refer to Figure 4 , Figure 4A schematic diagram of a detection device for detecting nozzle seat fillet welds is provided in an embodiment, as shown in the figure, a transmission ring 101 is sleeved on the outside of a nozzle 100, a first power output device 104 is connected to one end of a first transmission rod 103, a transmission wheel 102 is arranged at the other end of the first transmission rod 103, the outer side surface of the transmission wheel 102 is engaged with the inner side surface of the transmission ring 101, and the structures and connection modes of the two can be referred to Figure 3 The preset function device is connected to the transmission ring 101.

[0059] In the present embodiment, the structure of the magnetic field generating component is not limited, and a rotating magnetic field can be generated to the detected part to achieve detection. In some embodiments, the structures shown in Figure 4 and Figure 5 can be combined for reference, Figure 5 A schematic diagram of a device for detecting welds in a device for detecting nozzle seat fillet welds is provided in an embodiment, the magnetic field generating component 201 includes a first magnetic yoke 206 and a second magnetic yoke 207 that intersect each other, coils are wound on any one of the magnetic yokes, and a rotating magnetic field is generated by passing alternating current through the coils of each magnetic yoke. The first magnetic yoke 206 and the second magnetic yoke 207 are perpendicular to each other, and each magnetic yoke is wound with an independent circuit loop alternating current coil. According to the principle of rotating magnetic field, a phase difference of 90° between the two alternating currents is obtained by adding a phase transformer in one of the circuits. A rotating magnetic field is generated in the area surrounded by the four magnetic yoke contacts and the surrounding area after energization. Thus, the defects in all directions of the detected weld can be checked by one magnetization, without the need to change the position and direction of the magnetic yoke, thereby improving the detection efficiency and defect detection rate. Any magnetic yoke can be stacked with silicon steel sheets, and the silicon steel sheets at the bottom of the magnetic yoke can be designed as ellipsoidal to ensure that the two groups of magnetic yokes effectively contact the surface of the detected part. Preferably, multiple sets of magnetic yokes with different specifications and sizes can be configured, and in actual application, the appropriate magnetic yoke can be selected and used according to the weld size and detection space.

[0060] The cylinder 202 is used to output a preset liquid to the detected part to achieve detection, and the cylinder 202 is preferably a straight cylinder to minimize the occupied space to be suitable for narrow spaces. The preset liquid is injected into the cylinder 202 through the liquid inlet 208 of the cylinder 202 and sprayed to the detected part through the liquid outlet of the cylinder 202. The preset liquid can be a detection magnetic suspension liquid. Optionally, an end cover can be arranged at one end of the cylinder 202, and a through hole for spraying the preset liquid is arranged on the end cover. Preferably, multiple through holes can be arranged on the end cover, and the preset liquid is sprayed in the form of spraying through the multiple through holes of the end cover, for example, 6-10 through holes can be arranged on the end cover. The end cover can be a rubber end cover.

[0061] Preferably, an air compressor is arranged on the barrel 202, and a valve allowing air to enter the barrel 202 from the outside unidirectionally, the valve can also be called a check valve, which only allows air to enter the barrel 202 from the outside unidirectionally, and is prevented in the opposite direction. The air compressor can be operated to make air enter the barrel 202 through the valve, generate pressure on the preset liquid in the barrel 202, and make the preset liquid in the barrel 202 spray out through the liquid outlet. In actual application, after the magnetic suspension liquid is filled in the barrel 202 and the end cover is locked and sealed, the air compressor is continuously pressed, and according to the pressure principle, the magnetic suspension liquid can be continuously sprayed to the surface of the area composed of the cross magnetic yoke points (i.e. the welding seam and the surrounding area). For reference Figure 5 As shown in FIG. 9, an air compressor 209 is arranged on the barrel 202, and the air compressor 209 is attached with a valve allowing air to enter the barrel 202 from the outside unidirectionally. Considering the small space for on-site detection, an extended hose can be connected with the air compressor 209 to operate the air compressor 209, which is convenient for operation. The air compressor 209 can be a small rubber air compressor, and the hose can be a rubber hose.

[0062] Preferably, as shown in FIG. 10, Figure 5 An observation window 210 can also be arranged on the barrel 202. The magnetic suspension liquid remaining in the barrel 202 can be observed through the observation window 210, the observation window 210 can be arranged along the length direction of the barrel 202, and the observation window 210 can be designed as a transparent window. The magnetic field generating component 201 is connected with the barrel 202 and arranged at one end of the barrel 202, specifically arranged on the outer surface of the end where the liquid outlet is located, and the magnetic field generating component 201 can be fixed by positioning screws. The connecting line connected with the magnetic field generating component 201 can be arranged along the barrel 202, and a corner transformer 211 is connected on the connecting line.

[0063] For reference Figure 4 and Figure 5 As shown in FIG. 11, the proximal end of the barrel 202 is connected with one end of a third transmission rod 203, and the other end of the third transmission rod 203 is connected with the transmission ring 101. When the transmission ring 101 rotates around the connector pipe 100, the barrel 202 and the magnetic field generating component 201 are moved through the third transmission rod 203, can be continuously moved along the welding fusion line of the connector pipe 100, and sequentially detect each position of the welding seam. A fixing member 204 is arranged on the transmission ring 101, the fixing member 204 includes a rotatable ball 205, the ball 205 is connected with the third transmission rod 203, and the third transmission rod 203 and the magnetic field generating component 201 can rotate around the fixing member 204 as a fulcrum, so that each magnetic yoke contact of the magnetic field generating component 201 can closely contact the surface of the detected welding seam.

[0064] Preferably in some embodiments, the magnetic field generating component 201 comprises a first magnetic yoke and a second magnetic yoke which are crossed with each other, an illumination light source is arranged on the first magnetic yoke, and a camera is arranged on the second magnetic yoke, through which the image of the detected part can be photographed. For reference Figure 5 As shown in the figure, an illumination light source 212 is arranged on the first magnetic yoke 206, and a camera 213 is arranged on the second magnetic yoke 207. During the detection process, the image or video recorded by the camera 213 can be transmitted to the monitoring device, which can be transmitted through wireless communication or wired communication. The wireless communication includes but is not limited to Bluetooth or local area network. The monitoring device can be a mobile communication device such as a special mobile phone. The user can use the corresponding software APP of the special mobile phone to observe the magnetic trace in real time and judge whether there is a defect. The detection and defect situation can be observed, judged and recorded in real time. For example, refer to Figure 8 , Figure 8 The schematic diagram of the working interface of the mobile phone APP of an embodiment.

[0065] In some embodiments, the device can further comprise a support ring and a support frame. The support ring is sleeved outside the connecting pipe 100, and the support frame is connected to one end of the support ring and supported on the other end of the support frame. The driving device is fixed by the support ring and the support frame. For example, refer to Figure 2 and Figure 4 As shown in the figure, two sets of support rings 107 and support frames 108 are used. The support ring 107 is sleeved outside the connecting pipe 100, and the support frame 108 is connected to one end of the support ring 107 and supported on the other end of the support frame 108. Alternatively, the support ring 107 can comprise two half rings which are detachably connected. In order to facilitate the installation of the support ring 107 on the connecting pipe 100 and the disassembly, the working efficiency is improved. The two half rings of the support ring 107 can be connected and fixed through the buckle on the outer surface of the ring.

[0066] In the above embodiments, the driving device can control the rotation speed of the transmission wheel 102, and correspondingly control the rotation speed of the transmission ring 101. In a specific example, the driving device controls the rotation rate of the transmission wheel 102 to be designed as 30° / min, 60° / min, 90° / min, 120° / min, 180° / min, a total of 5 levels, and the transmission wheel 102 and the transmission ring 101 rotate at a constant speed. The first power output device 104 can be provided with a rotation speed adjusting button to switch the rotation rate according to the actual situation. For example, the first power output device 104 is a servo motor, and a rotation speed adjusting button is arranged on the servo motor machine shell.

[0067] In some embodiments, an electric slip ring is arranged on the transmission ring 101, which is arranged on the circumferential outer surface of the transmission ring 101 and fixedly connected with the transmission ring 101. One end of the electric slip ring is electrically connected with the preset functional device, and the other end is connected with the power supply system. The electric slip ring is connected with the power supply system, and power supply to the preset functional device is realized through the electric slip ring. Since the preset functional device moves around the connecting pipe 100, the electric slip ring arranged on the transmission ring 101 solves the problem of wire winding. For example, refer to Figure 6 , Figure 6 The schematic diagram of the transmission ring and the electric slip ring of an embodiment is shown in the figure. The electric slip ring 300 is fixed on the circumferential outer surface of the transmission ring 101 and coaxially fixedly connected with the transmission ring 101. The electric slip ring 300 rotates synchronously with the transmission ring 101. The electric slip ring 300 is respectively connected with conductive contacts at two opposite positions. As shown in the figure, a set of positive and negative conductive contacts 301 and 302 are respectively connected at 180° opposite positions of the electric slip ring 300. The set of positive and negative conductive contacts 301 and 302 are connected with the preset functional device, specifically connected with the wires of the second power output device 109. The other set of positive and negative conductive contacts 301 and 302 of the electric slip ring 300 are connected with the power supply system. In this way, the problem of power line winding is avoided, and stable power supply is ensured.

[0068] In this embodiment, the type and structure of the power supply system are not limited. If the device of this embodiment is a polishing and cleaning device for connecting pipe seat corner weld joint detection, and the preset functional device is a device for polishing and cleaning the connecting pipe seat corner, corresponding to the polishing and cleaning device for connecting pipe seat corner weld joint detection shown in Figure 2 , the power supply system can be divided into two circuits and connected with the first power output device 104 and the second power output device 109 respectively to supply power to the two devices. The power supply system can use a rechargeable large-capacity battery. The battery can be designed with two output interfaces. Each output interface is equipped with an independent switch to control the power-on and power-off of the output interface. An input interface and a set of power remaining display lights and a charging signal light can be designed. The input interface is used to charge the battery. Whether the battery is in the charging state or has completed the charging can be observed through the charging signal light. The power remaining of the battery can be observed through the power remaining display light. For example, refer to Figure 7 , Figure 7 The schematic diagram of the power supply system of an embodiment is shown in the figure. As shown in the figure, the battery is designed with two output interfaces 304. Each output interface 304 is equipped with an independent switch 305. An input interface 303 and a charging signal light and a set of power remaining display lights are designed. Preferably, plug-in connectors are designed at both ends of the power supply wire to improve the efficiency of wire connection assembly and disassembly.

[0069] If the device of this embodiment is a detection device for connecting pipe seat corner weld joint detection, and the preset functional device is a device for weld joint detection of the connecting pipe seat corner, corresponding toFigure 4 The power supply system can be connected to the first power output device 104 and the magnetic field generating component 201 (including the illumination light source and the camera device) through two circuits respectively, and power is supplied to the two devices respectively. The power supply system can use a rechargeable large-capacity battery, and the specific implementation can refer to the rechargeable large-capacity battery described above. Preferably, a switch can be additionally arranged on the circuit connected to the magnetic field generating component 201, which is used to control the connection and disconnection of the current output to the magnetic field generating component 201, thereby controlling the magnetization time of the cross-magnetizing yoke, so as to achieve the purpose of magnetization according to the standard specification.

[0070] The polishing and cleaning device and the detection device of the embodiment are used for detecting the nozzle seat fillet weld in the narrow space of the header of a thermal power unit, and the specific implementation steps are as follows:

[0071] 1) Determine the information of the detected component: through the methods such as consulting drawings and actual observation and measurement, the information such as the number of the detected fillet weld of the header nozzle seat, the angle arrangement of each heating surface tube row and the header, the outer diameter of the heating surface nozzle, the width of the fillet weld, etc. is confirmed, and if necessary, a CAD schematic diagram is drawn.

[0072] 2) Select the transmission ring, support frame accessories and polishing piece: according to the outer diameter of the detected nozzle and the inspection space, the appropriate size of the transmission ring, the fixed ring and the support ring in the polishing and cleaning device and the detection device are selected, which specifically includes the support frame and the support ring of the driving device, the transmission ring and the fixed ring supporting the polishing machine, and the transmission ring supporting the magnetic powder detection device, so as to realize the close fixation with the nozzle without relative movement displacement and to support each component stably and orderly.

[0073] 3) Polishing and cleaning device fixing and debugging: the servo motor support frame, the transmission ring and the fixed ring supporting the polishing machine are respectively installed on the header nozzle, the gear joint gap is adjusted, the servo motor and the polishing machine are tightly fastened by threads, the whole polishing and cleaning device is moved forward and backward along the nozzle axis to determine the appropriate adhesion of the polishing piece to the weld, and the battery is connected to the polishing machine and the servo motor. After the power is turned on by the start switch, the rotation rate of the servo motor and the polishing quality of the weld surface are checked. If the polishing quality does not meet the standard requirements, the position of the polishing and cleaning device, the rotation rate and the like should be adjusted to improve and perfect. After the polishing quality meeting the standard is obtained and the adjustment and debugging are completed, the information such as the instrument placement position (such as the distance between the transmission ring and the fixed ring and the length of the weld) and the rotation rate of the servo motor is recorded, so that the weld polishing can be carried out on the nozzles at other same positions.

[0074] 4) Prepare the magnetic suspension: black magnetic paste is used as the solute, water is used as the solvent, and a magnetic suspension with a concentration of 20-25 g / L is prepared. After stirring uniformly, the magnetic suspension is filled into the cylinder body and the end cover is tightly sealed. In order to ensure that the magnetic suspension spraying effect meets the detection requirements, the magnetic suspension in the cylinder body should account for 20%-95% of the total volume of the cylinder body.

[0075] 5) Detection device fixed debugging: after disassembling the polishing and cleaning device on the pipe, fix and connect the detection device accessories (cross magnetic yoke, transmission ring, servo motor and support frame, battery), etc., and adjust the position of the detection instrument to ensure that the cross magnetic yoke contact is across the two sides of the weld and in good contact with the detected surface. A1-30 / 100 magnetic test piece is tightly attached to the surface of the weld, and the artificial crack surface of the test piece is tightly attached to the weld. Turn on the power, check the running state of the lamp and camera, and the picture on the mobile phone APP. Press the air compressor continuously, spray the magnetic suspension liquid to the detected surface, press the magnetization control switch for 3-5 seconds, then disconnect, and detect the test piece and the adjacent area; observe the crack detection on the test piece through the mobile phone, if the known "+" type artificial crack defect of the test piece can be clearly displayed, the magnetization, magnetic suspension liquid spraying, shooting and mobile phone display system running state are good, and the detection system debugging is completed.

[0076] 6) Polishing and detection process implementation: after the debugging is completed, the polishing and detection work is carried out on each pipe girth weld in turn, and the surface magnetic trace and defect information is observed in real time through the mobile phone APP.

[0077] 7) Defect recording: through the observation of the magnetic trace of the detected surface, the relevant defect magnetic trace is confirmed and displayed, and the defect information is stored and recorded by the mobile phone, and the defect weld is marked on site.

[0078] 8) Defect elimination: for the defects found in the detection, when the mechanical polishing method is used to eliminate, the polishing and cleaning device can be used, the original polishing piece for polishing the weld is replaced, the special polishing piece such as conical and small spherical is selected, and the defect is treated for targeted elimination.

[0079] 9) Weld reinspection: the mechanical polishing treated weld area is detected by the detection device for magnetic powder detection and reinspection, and the magnetic trace is recorded and observed in real time.

[0080] 10) Instrument detection is completed, the power is turned off, the whole polishing and detection device is disassembled on the pipe, and the complete instrument equipment is installed on the next detected pipe to continue the polishing and detection work. After the final completion of all detection work, clean the remaining magnetic suspension liquid in the pipe, clean each part, and properly place it for next use.

[0081] The device for detecting the nozzle seat fillet weld of the embodiment can be designed as a polishing and cleaning device for the nozzle seat fillet weld and a detection device for detecting the nozzle seat fillet weld, adopts a transmission ring, a transmission wheel, a fixing ring and a driving device, realizes the rotation of the polisher along the central axis of the nozzle of the heated surface while the polisher is working, and is used for polishing and cleaning the weld surface, adopts the transmission ring, the transmission wheel and the driving device, realizes the detection of the detection device while the detection device is working, and gradually scans and detects the whole weld. The device for detecting the nozzle seat fillet weld of the embodiment can realize the detection of the nozzle seat fillet weld in a narrow space, fill the detection blind area, improve the detection quality, effectively supervise the equipment parts, and avoid missed detection. The present application scheme is novel and unique, the designed polishing and cleaning and detection system is stable and reliable, breaks through the bottleneck of the prior art, solves the problems of poor welding polishing and detection effect, and effectively improves the defect detection rate.

[0082] The contents not described in detail in the specification all belong to the prior art known by the person skilled in the art. Although the present application has been disclosed as above, it is not used to limit the protection scope of the present application, and any modification and improvement made by the person skilled in the art without departing from the concept and scope of the present application shall fall within the protection scope of the present application.

[0083] The device for detecting the nozzle seat fillet weld provided by the present application is described in detail above. The principles and implementation modes of the present application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that the person skilled in the art can make some improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A device for detecting fillet welds of pipe sockets, characterized in that: It includes a driving device, a transmission ring, a transmission wheel and a preset function device; The transmission ring can be sleeved on the outside of the connecting pipe, and a tooth groove is provided on the inner side surface of the transmission ring, and a tooth groove is provided on the outer side surface of the transmission wheel. The tooth groove on the inner side surface of the transmission ring meshes with the tooth groove on the outer side surface of the transmission wheel, so that the inner side surface of the transmission ring meshes with the outer side surface of the transmission wheel. The driving device includes a first transmission rod, and the driving device is connected to the transmission wheel through the first transmission rod, and is used to drive the transmission wheel to rotate, so that the transmission wheel drives the transmission ring to rotate around the connecting pipe, and the preset function device is connected to the transmission ring, so that the transmission ring drives the preset function device to move around the connecting pipe; The invention also includes a support ring and a support frame, wherein the support ring is sleeved on the outside of the pipe, one end of the support frame is connected to the support ring, and the other end of the support frame is supported by the driving device, and the driving device supports the transmission ring so that the transmission ring is sleeved on the outside of the pipe and rotates around the pipe under the drive of the transmission wheel; It also includes a fixing ring, which can be sleeved on the outside of the connecting pipe, and the fixing ring is provided with a cavity connected along the circumference of the fixing ring, and a ball is provided in the cavity. One end of the preset component of the preset function device is connected to the transmission ring, and the other end of the preset component is connected to the ball. The preset function device includes a second power output device and a grinding component. The second power output device is connected to the grinding component for outputting power to the grinding component, and the preset component includes the second power output device.

2. The device for detecting fillet welds of nozzles according to claim 1, characterized in that: The second power output device is connected to one end of the second transmission rod, the other end of the second transmission rod is connected to one end of the elastic connecting member, and the other end of the elastic connecting member is connected to the polishing component.

3. The device for detecting fillet welds of nozzles according to claim 1, characterized in that: A fixing member is provided on the transmission ring. The fixing member includes a rotatable rolling ball. The rolling ball is connected to the preset function device so that the preset function device is rotatable relative to the fixing member.

4. The device for detecting fillet welds of nozzles according to claim 1, characterized in that: The preset function device includes a cylinder and a magnetic field generating component. The cylinder is used to contain a preset liquid and is provided with a liquid inlet and a liquid outlet. The magnetic field generating component is used to generate a magnetic field.

5. The device for detecting fillet welds of nozzles according to claim 4, characterized in that: An air compressor and a valve allowing air to enter the cylinder from the outside in one direction are arranged on the cylinder, and the air compressor is communicated with the valve.

6. The device for detecting fillet welds of a nozzle seat according to any one of claims 1 to 5, characterized in that: An electric slip ring is provided on the transmission ring. The electric slip ring is laid on the circumferential outer surface of the transmission ring and is fixedly connected to the transmission ring. One end of the electric slip ring is electrically connected to the preset functional device, and the other end is connected to the power supply system.

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