Online flaw detection device for end part of large-diameter seamless tube

Abstract

The invention discloses a large-diameter seamless pipe end online flaw detection device which comprises a plurality of rotating riding wheel mechanisms, two lifting pressing wheel mechanisms, two pipe end flaw detection mechanisms, two plug pieces and a control terminal. The multiple rotating riding wheel mechanisms are sequentially arranged in the transverse direction and used for jointly supporting the non-end portion of the same large-diameter seamless pipe and jointly driving the same large-diameter seamless pipe to rotate around the transverse axis of the rotating riding wheel mechanisms. The two pipe end flaw detection mechanisms are respectively provided with two coupling flaw detection ends for performing ultrasonic flaw detection after being coupled with the lower ends of the two ends of the same large-diameter seamless pipe, and each pipe end flaw detection mechanism comprises a transverse driving part for driving the corresponding coupling flaw detection end to move in the transverse direction and a vertical driving part for driving the corresponding coupling flaw detection end to move in the vertical direction. According to the invention, the whole end part of the large-diameter seamless tube can be subjected to ultrasonic flaw detection, and the coupling flaw detection end can still keep stable medium coupling at the tail end of the large-diameter seamless tube, so that the length of a flaw detection blind area is reduced to be absolutely zero, and manual detection is completely avoided.

Description

Technical Field

[0001] This invention belongs to the field of flaw detection technology for large-diameter seamless pipes, and particularly relates to an online flaw detection device for the ends of large-diameter seamless pipes. Background Technology

[0002] Large-diameter seamless steel pipes (outer diameter greater than 219mm) are a key basic material that forms the backbone of modern industry. They support energy security, promote the development of heavy equipment, and ensure chemical safety and the construction of major projects.

[0003] The final and crucial step in the production of large-diameter seamless steel pipes is non-destructive testing, with online ultrasonic testing to inspect for internal defects being an essential step. Online ultrasonic testing devices, exemplified by those from the German company KK, scan the entire cross-section by moving along the steel pipe in a straight line while a series of probes rotate within a coupling tank. However, due to poor coupling immediately upon entering the coupling tank and the space occupied by the probe array itself, a detection blind zone exists approximately 600mm from both ends of the pipe. This blind zone requires manual inspection. Given the large diameter of large-diameter seamless steel pipes, manual processing is extremely labor-intensive, inefficient, and inaccurate, thus impacting the production speed of large-diameter seamless steel pipes. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides an online flaw detection device for the end of a large-diameter seamless pipe, which can perform ultrasonic flaw detection on the entire end of the large-diameter seamless pipe.

[0005] The objective of this invention is achieved through the following technical solution: An online flaw detection device for the ends of large-diameter seamless pipes, comprising: Multiple rotating roller mechanisms are arranged sequentially along the transverse direction and are used to jointly support the non-end of the same large-diameter seamless tube and jointly drive the same large-diameter seamless tube to rotate around its own transverse axis. Two lifting pressure roller mechanisms are used to contact the upper end of the non-end of the same large-diameter seamless tube after being lowered, and cooperate with multiple rotating support roller mechanisms to radially limit the same large-diameter seamless tube; The two-pipe-end flaw detection mechanism is provided with two coupled flaw detection ends for ultrasonic flaw detection after being coupled to the lower ends of the two ends of the same large-diameter seamless pipe. The pipe-end flaw detection mechanism includes a transverse driving member for driving the coupled flaw detection ends to move laterally and a vertical driving member for driving the coupled flaw detection ends to move vertically. Two end caps are used to coaxially block both ends of the same large-diameter seamless tube. The diameter of the exposed part of the end cap matches the outer diameter of the large-diameter seamless tube, and the length of the exposed part of the end cap is not less than half the width of the coupling inspection end. The control terminal is electrically connected to the rotating roller mechanism, the lifting pressure roller mechanism, the coupling flaw detection end, the horizontal drive component, and the vertical drive component.

[0006] Furthermore, the online flaw detection device for the ends of large-diameter seamless pipes also includes: Seamless tube stand, the upper end of the seamless tube stand is inclined and has a placement surface, on which several large-diameter seamless tubes extending laterally are placed one by one along the length direction; Pipe pulling machine is used to pull out large-diameter seamless pipes one by one from the surface. The first guide plate, the upper side of the first guide plate is joined to the lower side of the placement surface; Several lifting mechanisms are provided. After the upper end face of the lifting mechanism is lifted to the high side, it is connected to the lower end face of the upper end face of the first guide plate. The several lifting mechanisms are arranged in sequence along the transverse direction and are used to lift the non-end of the same large-diameter seamless pipe. The second guide plate has its upper end face joined to the lower side of the upper end face of the lifting mechanism after it has been lifted. The output roller conveyor is located below the lower side of the upper end face of the second guide plate, and the output roller conveyor outputs laterally. Among them, after the upper surfaces of several lifting mechanisms are lowered simultaneously, the large-diameter seamless pipe is supported by multiple rotating roller mechanisms. The control terminal is electrically connected to the tube shifting machine, the lifting mechanism, and the output roller conveyor.

[0007] Furthermore, the pipe pulling machine includes a lifting baffle and a pipe clamp, both of which are electrically connected to a control terminal; After the lifting baffle moves upward, it blocks the first large-diameter seamless pipe from bottom to top and restricts its downward rolling. After the tube clamp is output downwards, it clamps the second large-diameter seamless tube from bottom to top and restricts its downward rolling.

[0008] Furthermore, an adjustment rail is provided directly above the seamless pipe stand for longitudinally adjusting the longitudinal position of the pipe clamp.

[0009] Furthermore, the inclination angles of the placement surface, the upper surface of the first guide plate, and the upper surface of the second guide plate are consistent.

[0010] Furthermore, the rotating roller mechanism includes two rollers with the same diameter and a first rotation drive mechanism for driving the rollers to rotate. The rotation center lines of the two rollers are at the same height and are parallel to each other.

[0011] Furthermore, the coupling inspection end includes a probe for supplying ultrasonic coupling agent to the lower end of a large-diameter seamless pipe and performing ultrasonic inspection; The pipe end flaw detection mechanism includes several bullseye bearings located on the upper part of the probe and used to contact the lower end of the large-diameter seamless pipe together. The pipe end flaw detection mechanism includes a connecting seat, the output end of the horizontal drive component is fixedly connected to the fixed end of the vertical drive component, and the output end of the vertical drive component is fixedly connected to the connecting seat. The pipe end flaw detection mechanism includes a shaft fork, a self-lubricating bearing is vertically fixedly connected to the upper part of the connecting seat, the shaft part of the shaft fork is vertically inserted into the self-lubricating bearing, the fork part of the shaft fork is longitudinally connected to a connecting shaft, and the lower part of the probe is connected to the connecting shaft.

[0012] Furthermore, the large end of the shaft of the shaft fork is vertically detachably connected to a guide key, and the connecting seat is vertically provided with a guide keyway for key connection of the guide key, and there is a first gap between the guide key and the guide keyway. After the small end of the shaft of the fork passes through the self-lubricating bearing, a retaining ring and a first elastic element are sequentially sleeved on it. The two ends of the first elastic element abut against the lower end face of the retaining ring and the lower part of the connecting seat, respectively. The two ends of the connecting shaft are rotatably connected to the fork of the shaft fork, and there is a second gap between the lower end face of the probe and the fork of the shaft fork; The lower part of the probe is sleeved on the connecting shaft. Both ends of the probe are provided with a second elastic element for sleeved on the connecting shaft and a fastening nut for threaded connection on the connecting shaft. The two ends of the second elastic element abut against the probe and the fastening nut, respectively.

[0013] Furthermore, the probe includes a body, an epoxy resin layer embedded in the upper part of the body, and a water distribution channel for supplying ultrasonic coupling agent, the water distribution channel passing through the body and the epoxy resin layer with the water distribution end facing upward.

[0014] Furthermore, the lateral drive component includes a base, on which a lead screw is rotatably connected and fixedly connected a second rotation drive mechanism for driving the lead screw to rotate. A lead screw nut is threaded onto the lead screw, and a slide is fixedly connected to the lead screw nut. The lower part of the slide is laterally slidably connected to the base. The vertical drive component includes a linear drive mechanism and two parallel connecting rods. Both ends of the linear drive mechanism are hinged longitudinally to the slide and the connecting seat, respectively. The lower ends of the two connecting rods are hinged longitudinally to the slide at the same height, and the upper ends of the two connecting rods are hinged longitudinally to the connecting seat at the same height.

[0015] The beneficial effects of this invention are as follows: Multiple rotating support roller mechanisms can jointly support the large-diameter seamless tube and drive it to rotate around its own axis. Two lifting pressure roller mechanisms can cooperate with multiple rotating support roller mechanisms to radially limit the large-diameter seamless tube. Then, the vertical drive component drives the coupling inspection end to approach the large-diameter seamless tube. The coupling inspection end supplies ultrasonic coupling agent between itself and the large-diameter seamless tube. As the large-diameter seamless tube rotates, the coupling inspection end can perform ultrasonic inspection on one end face of the large-diameter seamless tube. The horizontal drive component can drive the coupling inspection end to move along the length of the large-diameter seamless tube, thereby enabling ultrasonic inspection on the entire end of the large-diameter seamless tube. This invention employs a rotating support roller method and arranges pipe end flaw detection mechanisms below both ends of large-diameter seamless pipes. The stroke of these mechanisms is one-twelfth that of the upward-probing type, allowing for miniaturization of the flaw detection mechanisms, significantly reducing investment costs and the amount of three-dimensional space they occupy. Furthermore, the downward-probing type has its water distribution end facing upward, meaning the ultrasonic coupling agent can only overflow upwards. Therefore, it requires less ultrasonic coupling agent and lower pressure, resulting in stable coupling. This avoids the problem of low ultrasonic penetration caused by the upward-probing type, which necessitates increased flow and pressure to replenish breached water. In this invention, the diameter of the exposed part of the plug is matched with the outer diameter of the large-diameter seamless pipe, and the length of the exposed part of the plug is not less than half the width of the coupling inspection end. This allows the coupling inspection end to maintain stable medium coupling even at the end of the large-diameter seamless pipe, thereby reducing the length of the inspection blind zone to absolute zero and completely eliminating the need for manual inspection. Attached Figure Description

[0016] The invention will now be described in more detail with reference to embodiments and the accompanying drawings. Figure 1 A schematic diagram of the structure of the present invention is shown; Figure 2 Showing Figure 1 Sectional view at point AA; Figure 3 Showing Figure 1 Sectional view at point BB; Figure 4 Showing Figure 1 Sectional view at CC; Figure 5 This shows a schematic diagram of the pipe end flaw detection mechanism in this invention; Figure 6 Showing Figure 5 Sectional view at point DD; Figure 7 A schematic diagram of the probe structure in this invention is shown; Figure 8 Showing Figure 7 Sectional view at EE; Figure 9 A schematic diagram of the installation of the plug component in this invention is shown; In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0017] Figure label: 100 Seamless tube stand; 110 Placement surface; 200 Tube pulling machine; 210 Lifting baffle; 220 Tube clamp; 300 First guide plate; 400 Rotating roller mechanism; 410 First rotation drive mechanism; 420 Support roller; 500 Lifting mechanism; 600 Second guide plate; 700 Output roller conveyor; 800 Lifting pressure roller mechanism; 900 Tube end flaw detection mechanism; 910 Horizontal drive component; 911 Base; 912 Slide; 913 Lead screw nut; 914 Lead screw; 915 Second rotation drive mechanism; 920 Vertical drive component Moving part; 921, linear drive mechanism; 922, connecting rod; 930, coupling flaw detection end; 931, connecting seat; 932, self-lubricating bearing; 933, shaft fork; 934, retaining ring; 935, connecting shaft; 936, second elastic element; 937, fastening nut; 938, probe; 939, bullseye bearing; 1000, epoxy resin layer; 1100, longitudinal defect detection crystal; 1200, water distribution channel; 1300, transverse defect detection crystal; 1400, first mounting hole; 1500, ejection hole; 1600, second mounting hole; 1700, plug. Detailed Implementation

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] This invention provides an online flaw detection device for the ends of large-diameter seamless pipes, such as... Figure 1-9 As shown, it includes: Multiple rotating support roller mechanisms 400 are arranged evenly in the transverse direction and are used to jointly support the non-end of the same large-diameter seamless tube and jointly drive the same large-diameter seamless tube to rotate around its own transverse axis. Two lifting pressure roller mechanisms 800 are used to contact the upper end of the non-end of the same large-diameter seamless tube after being lowered, and cooperate with multiple rotating support roller mechanisms 400 to radially limit the same large-diameter seamless tube. The two-pipe-end flaw detection mechanism 900 is provided with two coupling flaw detection ends 930 for ultrasonic flaw detection after being coupled to the lower ends of the two ends of the same large-diameter seamless pipe. The pipe-end flaw detection mechanism 900 includes a transverse driving member 910 for driving the coupling flaw detection ends 930 to move laterally and a vertical driving member 920 for driving the coupling flaw detection ends 930 to move vertically. Two plugs 1700 are used to coaxially plug both ends of the same large-diameter seamless tube. The diameter of the exposed part of the plug 1700 matches the outer diameter of the large-diameter seamless tube, and the length of the exposed part of the plug 1700 is not less than half the width of the coupling flaw detection end 930. The control terminal is electrically connected to the rotating support roller mechanism 400, the lifting pressure roller mechanism 800, the coupling flaw detection end 930, the horizontal drive component 910, and the vertical drive component 920. The standard large-diameter seamless tube is 6 meters long, and after deburring both ends, end flaw detection is performed.

[0020] Understandably, multiple rotating support roller mechanisms 400 can jointly support the large-diameter seamless tube and drive it to rotate around its own axis. Two lifting pressure roller mechanisms 800 can cooperate with the multiple rotating support roller mechanisms 400 to radially limit the large-diameter seamless tube. Then, the vertical drive member 920 drives the coupling inspection end 930 to approach the large-diameter seamless tube. The coupling inspection end 930 supplies ultrasonic coupling agent between itself and the large-diameter seamless tube. As the large-diameter seamless tube rotates, the coupling inspection end 930 can perform ultrasonic inspection on one end face of the large-diameter seamless tube. The horizontal drive member 910 can drive the coupling inspection end 930 to move along the length of the large-diameter seamless tube, thereby enabling ultrasonic inspection on the entire end of the large-diameter seamless tube. The design employs a 420-degree rotating support system, with pipe end flaw detection mechanisms 900 positioned below both ends of the large-diameter seamless pipe. The stroke of these mechanisms is one-twelfth that of the upward-probing type, allowing for miniaturization of the flaw detection mechanism, significantly reducing investment costs and the amount of three-dimensional space required. Furthermore, the downward-probing cavity faces upwards, correspondingly the water distribution end faces upwards, meaning the ultrasonic coupling agent can only overflow upwards. Therefore, the required ultrasonic coupling agent dosage and pressure are low, resulting in stable coupling. This avoids the problem of low ultrasonic penetration caused by the generation of numerous random small bubbles within the water cavity, which is a consequence of the upward-probing type's requirement to increase flow rate and pressure to replenish breached water. The diameter of the exposed part of the plug 1700 matches the outer diameter of the large-diameter seamless pipe. The length of the exposed part of the plug 1700 is not less than half the width of the coupling inspection end 930. This allows the coupling inspection end 930 to maintain stable medium coupling even at the end of the large-diameter seamless pipe, thereby reducing the length of the inspection blind zone to absolute zero and completely eliminating the need for manual inspection.

[0021] It should be noted that the lifting pressure roller mechanism 800 is located outside the end of the large-diameter seamless pipe and supports the lifting pressure roller in a "C"-shaped cantilever. The lifting pressure roller mechanism 800 may include a "C"-shaped bracket. A lifting oil rod is set vertically downward at one end of the "C"-shaped bracket. The lower end of the lifting oil cylinder is rotatably connected to the pressure roller around the transverse rotation center line. During flaw detection, the support roller 420 of the rotating support roller mechanism 400 rotates, and the pressure roller can prevent the large-diameter seamless pipe from bouncing, so as to avoid affecting the stability of ultrasonic coupling. It should be noted that the pipe end flaw detection mechanism 900 is located below the end of the large-diameter seamless pipe and uses ultrasonic testing technology, which can detect a maximum length of at least 600mm.

[0022] It should also be noted that the plug 1700 can be installed manually or mechanically; if mechanical installation is used, a hydraulic cylinder can be used to push it in laterally from one end of the large-diameter seamless pipe.

[0023] It should also be noted that the control system for the online flaw detection device at the end of large-diameter seamless pipes should include power supply and distribution facilities for each device and ultrasonic testing instruments, and the control terminal should have defect alarm and defect recording functions.

[0024] In one embodiment, such as Figure 1-4 As shown, the online flaw detection device for the ends of large-diameter seamless pipes also includes: Seamless tube stand 100, with a placement surface 110 inclined at the upper end of the seamless tube stand 100, on which several large-diameter seamless tubes extending laterally are placed one by one along the length direction. Pipe pulling machine 200 is used to pull out large-diameter seamless pipes one by one from the placement surface 110. The upper end face of the first guide plate 300 is joined to the lower side of the placement surface 110. Multiple lifting mechanisms 500, after being lifted on the high side of the upper end face of the lifting mechanism 500, are all connected to the low side of the upper end face of the first guide plate 300. The multiple lifting mechanisms 500 are arranged evenly in the transverse direction and are used to lift the non-end of the same large-diameter seamless pipe. The second guide plate 600, the upper end face of the second guide plate 600 is connected to the lower end face of the lifting mechanism 500 after being lifted; The output roller conveyor 700 is located below the lower side of the upper end face of the second guide plate 600, and the output roller conveyor 700 outputs laterally. After the upper surfaces of several lifting mechanisms 500 are lowered simultaneously, the large-diameter seamless pipe is supported by multiple rotating support roller mechanisms 400. The pipe pulling machine 200 includes a lifting baffle and a pipe clamping device 220; After the lifting baffle moves upward, it blocks the first large-diameter seamless pipe from bottom to top and restricts its downward rolling. After the pipe clamp 220 outputs downwards, it clamps the second large-diameter seamless pipe from bottom to top and restricts its downward rolling. The control terminal is electrically connected to the lifting baffle and pipe clamp 220, the lifting mechanism 500 and the output roller conveyor 700.

[0025] It is understandable that the large-diameter seamless tubes to be inspected are placed one by one on the seamless tube stand 100. Since the placement surface 110 is tilted at a certain angle, the large-diameter seamless tubes on the placement surface 110 can roll downwards in a free state. The lifting baffle device on the lower side of the seamless tube stand 100 can raise its baffle to block the large-diameter seamless tube, and lower its baffle to release the first large-diameter seamless tube; the tube clamp 220 above the seamless tube stand 100 can be raised and lowered. By lowering its lower "V"-shaped clamp, it can clamp the upper middle of the second large-diameter seamless tube, preventing it from rolling downwards freely. Raising its "V"-shaped clamp can release the clamped large-diameter seamless tube, allowing it to roll to the position blocked by the baffle; the lifting baffle device 210 and the tube clamp 220 work together to release individual large-diameter seamless tubes one by one onto the first guide plate 300.

[0026] It should be noted that the upper part of the lifting mechanism 500 is an inclined block with a slope, and the lower part is a vertically set lifting cylinder. The output end of the lifting cylinder is fixedly connected to the inclined block. After the large-diameter seamless tube is lifted, the large-diameter seamless tube can roll along the inclined surface onto the second guide plate 600.

[0027] In one embodiment, such as Figure 1-3 As shown, an adjustment rail for longitudinally adjusting the longitudinal position of the pipe clamp 220 is provided directly above the seamless pipe stand 100.

[0028] Understandably, by adjusting the position of the tube clamp 220 longitudinally, it can adapt to the diameter changes of different large-diameter seamless tube specifications.

[0029] It should be noted that an electric wheel that runs on the adjusting track can be installed on the pipe clamp 220. The electric wheel can be electrically connected to the control terminal so as to electrically adjust the longitudinal position of the pipe clamp 220.

[0030] In one embodiment, the tilt angles of the placement surface 110, the upper surface of the first guide plate 300, the upper surface of the lifting mechanism 500, and the upper surface of the second guide plate 600 are the same.

[0031] In one embodiment, the rotating roller mechanism 400 includes two rollers 420 with the same diameter and a first rotation drive mechanism 410 for driving the rollers 420 to rotate. The rotation center lines of the two rollers 420 are at the same height and are parallel to each other.

[0032] It should be noted that the sag at the bottom of large-diameter seamless tubes varies depending on the specifications. Currently, the specifications of large-diameter seamless tubes for flaw detection are generally designed according to Ф219~Ф580, so the vertical travel of probe 938 does not exceed 30mm. If probe 938 is placed directly above the large-diameter seamless tube, its travel will reach 361mm. Therefore, the travel of the downward probe method is one-twelfth that of the upward probe method, which can significantly save space and equipment investment. In addition, the support roller 420 can be driven by a hydraulic motor, which is the first rotation drive mechanism 410. The diameter of the support roller 420 is considered to be Ф350mm, so as to be exactly the same as the support roller 420 used on the production site, thereby facilitating maintenance and spare parts organization and management. The outer circle of the support roller 420 can be cast with a layer of polyurethane material to resist wear and improve the coefficient of friction, thereby achieving an anti-slip effect. When a large-diameter seamless pipe rolls onto the support roller 420, it can prevent the large-diameter seamless pipe from being deformed by impact.

[0033] In one embodiment, such as Figure 6 and Figure 9 As shown, the coupling inspection end 930 includes a probe 938 for supplying ultrasonic coupling agent to the lower end of a large-diameter seamless pipe and performing ultrasonic inspection. The pipe end flaw detection mechanism 900 includes several bullseye bearings 939 disposed on the upper part of the probe 938 and used to contact the lower end of the large-diameter seamless pipe together. The pipe end flaw detection mechanism 900 includes a connecting seat 931, the output end of the horizontal drive member 910 is fixedly connected to the fixed end of the vertical drive member 920, and the output end of the vertical drive member 920 is fixedly connected to the connecting seat 931. The pipe end flaw detection mechanism 900 includes a shaft fork 933, a self-lubricating bearing 932 connected to the upper part of the connecting seat 931 by a vertical screw, the shaft part of the shaft fork 933 being vertically inserted into the self-lubricating bearing 932, the fork part of the shaft fork 933 being longitudinally connected to a connecting shaft 935, and the lower part of the probe 938 being connected to the connecting shaft 935; wherein, the exposed length of the plug 1700 is greater than half the width of the probe 938.

[0034] Specifically, the shaft fork 933 has a guide key connected to the large end of the shaft by a vertical screw, and the connecting seat 931 has a guide keyway for key connection of the guide keyway, and there is a first gap between the guide keyway and the guide keyway. After the small end of the shaft of the shaft fork 933 passes through the self-lubricating bearing 932, a retaining ring 934 and a first elastic element are sequentially sleeved on it. An end cover is provided at the lower part of the connecting seat 931. The two ends of the first elastic element abut against the lower end face of the retaining ring 934 and the end cover at the lower part of the connecting seat 931, respectively. The first elastic element can be a spring. The two ends of the connecting shaft 935 are rotatably connected to the fork of the shaft fork 933, and there is a second gap between the lower end face of the probe 938 and the fork of the shaft fork 933. The lower part of the probe 938 is sleeved on the connecting shaft 935. Both ends of the probe 938 are provided with a second elastic element 936 for sleeved on the connecting shaft 935 and a fastening nut 937 for threaded connection on the connecting shaft 935. The two ends of the second elastic element 936 abut against the probe 938 and the fastening nut 937 respectively.

[0035] Understandably, the probe 938 contacts the lower end of the large-diameter seamless tube via the bullseye bearing 939, and the probe 938 moves with the large-diameter seamless tube to ensure that the relative position between the probe 938 and the workpiece remains constant. Compared with the commonly used probe 938 which uses wear-resistant blocks to slide and rub against the large-diameter seamless tube, the rolling method is more flexible and causes less wear, and will not produce a "gagging" phenomenon. The water coupling layer can be as thick as 10mm or more and is not easily damaged.

[0036] It should be noted that the probe 938 is mounted on the connecting shaft 935, and both ends of the probe 938 can be equipped with a cup-shaped rubber sleeve, which is a second elastic element 936. The position of the probe 938 in the middle position of the connecting shaft 935 can be adjusted by adjusting the position of the fastening nut 937. When the large-diameter seamless tube has a side bend or lateral deformation, it will drive the probe 938 to slide along the axial direction of the connecting shaft 935 to maintain the follow-up relationship. In addition, the second elastic element 936 can also be a spring or other elastic element. The initial tilt range of the probe 938 on the shaft fork 933 is determined by the second gap between the lower end face of the probe 938 and the fork of the shaft fork 933. When the probe 938 rotates at a large angle, the fork of the shaft fork 933 can restrict the probe 938 from continuing to rotate in the same direction. That is, in this invention, the probe 938 can only rotate slightly around the connecting shaft 935 in order to adapt to the up and down bending deformation of the large-diameter seamless tube. The shaft of the shaft fork 933 is inserted into the self-lubricating bearing 932 and is initially positioned by the guide key. There is a first gap between the guide key and the guide keyway so that the shaft fork 933 can rotate adaptively under the drive of the bending deformation of the large-diameter seamless tube, thereby keeping the center line of the probe 938 consistent with the lowest generatrix of the large-diameter seamless tube. The lower part of the shaft fork 933 is provided with a retaining ring 934 and a first elastic element. When the large-diameter seamless tube deforms downward, the shaft fork 933 can drive the probe 938 to move downward by a displacement of up to 10mm, so that the probe 938 and the large-diameter seamless tube can be kept in close contact.

[0037] It should also be noted that when replacing large-diameter seamless pipes, this invention only requires disconnecting the cable of probe 938 and pulling out the entire shaft fork 933 and above. In other words, this invention is very convenient for replacement and maintenance.

[0038] It should also be noted that both ends of the connecting shaft 935 can be mounted on the fork of the shaft fork 933 via through covers and fasteners.

[0039] In one embodiment, such as Figure 7 and Figure 8 As shown, the probe 938 includes a main body, an epoxy resin layer 1000 embedded in the upper part of the main body, and a water distribution channel 1200 for supplying ultrasonic coupling agent. The water distribution channel 1200 passes through the main body and the epoxy resin layer 1000 and the water distribution end faces upward.

[0040] It should be noted that the ultrasonic coupling agent can be water, which is supplied to the third gap between the probe 938 and the large-diameter seamless pipe through the water distribution channel 1200. The internal defects of the large-diameter seamless pipe are jointly scanned by two longitudinal defect detection wafers 1100 and two transverse defect detection wafers 1300, and both types of wafers are encapsulated and fixed by the epoxy resin layer 1000. The positioning of the probe 938 is accomplished by four evenly distributed bullseye bearings 939. The probe 938 is provided with a first mounting hole 1400 for mounting the bullseye bearings 939, and an ejection hole 1500 is provided at the lower end of the first mounting hole 1400 to facilitate the replacement of the bullseye bearings 939. The lower part of the probe 938 is provided with a second mounting hole 1600 for connecting the connecting shaft 935.

[0041] In one embodiment, such as Figure 5 As shown, the transverse drive component 910 includes a base 911, a lead screw 914 is rotatably connected to the base 911 and a second rotation drive mechanism 915 for driving the lead screw 914 to rotate is fixedly connected to the base 911, a lead screw nut 913 is threaded onto the lead screw 914, a slide block 912 is fixedly connected to the lead screw nut 913, and the lower part of the slide block 912 is slidably connected to the base 911 in the transverse direction. The vertical drive component 920 includes a linear drive mechanism 921 and two parallel connecting rods 922. Both ends of the linear drive mechanism 921 are hinged longitudinally to the slide 912 and the connecting seat 931, respectively. The lower ends of the two connecting rods 922 are hinged longitudinally to the slide 912 at the same height, and the upper ends of the two connecting rods 922 are hinged longitudinally to the connecting seat 931 at the same height.

[0042] It is understandable that the two parallel connecting rods 922 can form a parallel four-bar linkage with the slide 912 and the connecting seat 931, so that the probe 938 can swing up and down in parallel under the driving action of the linear drive mechanism 921; before the large-diameter seamless tube rolls into the rotating support roller mechanism 400, the probe 938 is swung away to prevent the large-diameter seamless tube from damaging the probe 938; after the large-diameter seamless tube rotates on the rotating support roller mechanism 400, the probe 938 is swung to make the probe 938 fit with the large-diameter seamless tube. In addition, the second rotary drive mechanism 915 can drive the slide 912 to slide on the base 911, and the reciprocating sliding translation stroke is 600mm.

[0043] It should be noted that the second rotation drive mechanism 915 can be a variable frequency motor, and the linear drive mechanism 921 can be a cylinder; the base 911 can be fixed to the equipment foundation with anchor bolts.

[0044] This invention also discloses an online flaw detection method for the ends of large-diameter seamless pipes, which includes the following steps: Run the pipe clamp 220 until it lowers and jams the second large-diameter seamless pipe from bottom to top; The lifting baffle is operated to lower and no longer block the first large-diameter seamless tube from bottom to top, so that the first large-diameter seamless tube rolls downward, and then the first large-diameter seamless tube rolls on multiple rotating support roller mechanisms 400 via the first guide plate 300. The rotating support roller mechanism 400 is operated to make the large-diameter seamless pipe rotate around its own axis; The lifting pressure roller mechanism 800 is operated to cooperate with the rotating support roller mechanism 400 to radially limit the large-diameter seamless tube, thereby making the large-diameter seamless tube rotate smoothly without bouncing. Activate the corresponding valve to supply clean coupling water to probe 938; The linear drive mechanism 921 is operated to keep the probe 938 in contact with the center of the lower end of the large-diameter seamless tube and to move accordingly. The second rotation drive mechanism 915 is activated to move the probe 938 axially to the tail of the large-diameter seamless tube; The control terminal records the relevant information about the flaw detection; The second rotary drive mechanism 915 stops operating, and the linear drive mechanism 921 reverses and retracts. The lifting pressure roller mechanism is raised and reset at 80°. The lifting mechanism 500 is raised to lift the large-diameter seamless tube, so that the large-diameter seamless tube rolls sequentially from the upper inclined surface of the lifting mechanism 500 and the second guide plate 600 onto the output roller conveyor 700, and then is transported to the next station by the output roller conveyor. This process is repeated until all flaw detection is completed, at which point the corresponding water valves are closed. The control terminal automatically transmits defect records to relevant business departments.

[0045] In summary, the present invention adopts a rotating support method with roller 420, and arranges pipe end flaw detection mechanism 900 below both ends of the large-diameter seamless pipe. Its stroke is one-twelfth of that of the upward-probing arrangement. Accordingly, the flaw detection mechanism can be miniaturized, the investment in the flaw detection mechanism is greatly reduced, and the three-dimensional space occupied is greatly reduced. This invention uses four bullseye bearings 939 to position the probe 938 at the lower end of a large-diameter seamless pipe. The water coupling layer is thick, which, compared with the commonly used sliding friction method on the market, allows for flexible rotation and avoids the phenomenon of "grinding" that damages the extremely thin coupling layer.

[0046] The present invention is a downward-probing type, with its cavity facing upward and the corresponding water distribution end facing upward, meaning that water can only overflow upward. Therefore, the required water volume and pressure are small, and the coupling is stable. This avoids the problem of low ultrasonic penetration caused by the random generation of a large number of small bubbles in the water cavity when the upward-probing type is used to replenish the water from the breach. The present invention designs the diameter of the exposed part of the plug 1700 to be the same as the outer diameter of the large-diameter seamless pipe, and the length of the exposed part of the plug 1700 is greater than half the width of the coupling inspection end 930. This allows the coupling inspection end 930 to maintain stable medium coupling even at the end of the large-diameter seamless pipe, thereby reducing the length of the inspection blind zone to absolute zero and completely eliminating the need for manual inspection. Because the probe 938 has four degrees of freedom, the present invention can fully adapt to the bending of the end of the large-diameter seamless pipe and keep the gap between the probe 938 and the large-diameter seamless pipe unchanged. As long as the coupling water supply is sufficient, there will be no coupling failure. Since the probe 938 is inserted into the self-lubricating bearing 932 along with the shaft fork 933, when changing the specifications of a large-diameter seamless tube, it is only necessary to disconnect the cable of the probe 938 and pull out the shaft fork 933 and the part above it as a whole. In other words, the replacement and maintenance of this invention is very convenient. This invention employs a mature ultrasonic flaw detection process, resulting in high reproducibility of the results. This reduces the requirements for system maintenance personnel, making it easier to promote and use widely.

[0047] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. An online flaw detection device for the ends of large-diameter seamless pipes, characterized in that, include: Multiple rotating roller mechanisms (400) are arranged laterally in sequence and used to jointly support the non-end of the same large-diameter seamless tube and jointly drive the same large-diameter seamless tube to rotate around its own transverse axis. Two lifting pressure roller mechanisms (800) are used to contact the upper end of the non-end of the same large-diameter seamless tube after being lowered, and cooperate with multiple rotating support roller mechanisms (400) to radially limit the same large-diameter seamless tube; Two pipe end flaw detection mechanisms (900) are provided with two coupling flaw detection ends (930) for ultrasonic flaw detection after being coupled to the lower ends of the two ends of the same large-diameter seamless pipe. The pipe end flaw detection mechanism (900) includes a transverse drive member (910) for driving the coupling flaw detection end (930) to move laterally and a vertical drive member (920) for driving the coupling flaw detection end (930) to move vertically. Two plugs (1700) are used to coaxially block both ends of the same large-diameter seamless tube. The diameter of the exposed part of the plug (1700) matches the outer diameter of the large-diameter seamless tube. The length of the exposed part of the plug (1700) is not less than half the width of the coupling flaw detection end (930). The control terminal is electrically connected to the rotating roller mechanism (400), the lifting pressure roller mechanism (800), the coupling flaw detection end (930), the horizontal drive component (910), and the vertical drive component (920).

2. The online flaw detection device for the end of a large-diameter seamless pipe according to claim 1, characterized in that, Also includes: Seamless tube stand (100), the upper end of the seamless tube stand (100) is inclinedly provided with a placement surface (110), and several large-diameter seamless tubes extending laterally are placed one by one on the placement surface (110) along the length direction. Pipe pulling machine (200), the pipe pulling machine (200) is used to pull out large-diameter seamless pipes one by one from the placement surface (110); The first guide plate (300) has its upper end surface high side joined to the lower side of the placement surface (110); A plurality of lifting mechanisms (500) are provided, wherein the upper end face of each lifting mechanism (500) is lifted to the lower side and then engages with the upper end face of the first guide plate (300). The plurality of lifting mechanisms (500) are arranged in sequence along the transverse direction and are used to lift the non-end of the same large-diameter seamless pipe. The second guide plate (600) is joined on the upper side of the lifting mechanism (500) after it has been lifted. Output roller conveyor (700), the output roller conveyor (700) is located below the lower side of the upper end surface of the second guide plate (600), the output roller conveyor (700) outputs laterally; Among them, after the upper surfaces of several of the lifting mechanisms (500) are lowered simultaneously, the large-diameter seamless tube is supported by multiple of the rotating support roller mechanisms (400); The control terminal is electrically connected to the tube-pulling machine (200), the lifting mechanism (500), and the output roller conveyor (700).

3. The online flaw detection device for the end of a large-diameter seamless pipe according to claim 2, characterized in that, The pipe pulling machine (200) includes a lifting baffle and a pipe clamp (220), both of which are electrically connected to a control terminal; After the lifting baffle is output upward, it blocks the first large-diameter seamless pipe from bottom to top and restricts its downward rolling. After the tube clamp (220) is output downward, the tube clamp (220) clamps the second large-diameter seamless tube from bottom to top and restricts its downward rolling.

4. The online flaw detection device for the end of a large-diameter seamless pipe according to claim 3, characterized in that, An adjustment track for longitudinally adjusting the longitudinal position of the tube clamp (220) is provided directly above the seamless tube stand (100).

5. The online flaw detection device for the end of a large-diameter seamless pipe according to claim 2, characterized in that, The inclination angles of the placement surface (110), the upper surface of the first guide plate (300), and the upper surface of the second guide plate (600) are the same.

6. The online flaw detection device for the end of a large-diameter seamless pipe according to claim 2, characterized in that, The rotating roller mechanism (400) includes two rollers (420) with the same diameter and a first rotation drive mechanism (410) for driving the rollers (420) to rotate. The rotation center lines of the two rollers (420) are at the same height and are parallel to each other.

7. The online flaw detection device for the end of a large-diameter seamless pipe according to claim 1 or 2, characterized in that, The coupling inspection end (930) includes a probe (938) for supplying ultrasonic coupling agent to the lower end of a large-diameter seamless pipe and performing ultrasonic inspection. The pipe end flaw detection mechanism (900) includes a number of bullseye bearings (939) disposed on the upper part of the probe (938) and used to contact the lower end of the large-diameter seamless pipe together. The pipe end flaw detection mechanism (900) includes a connecting seat (931), the output end of the horizontal drive member (910) is fixedly connected to the fixed end of the vertical drive member (920), and the output end of the vertical drive member (920) is fixedly connected to the connecting seat (931). The pipe end flaw detection mechanism (900) includes a shaft fork (933), a self-lubricating bearing (932) is vertically fixedly connected to the upper part of the connecting seat (931), the shaft part of the shaft fork (933) is vertically inserted into the self-lubricating bearing (932), the fork part of the shaft fork (933) is longitudinally connected to a connecting shaft (935), and the lower part of the probe (938) is connected to the connecting shaft (935).

8. The online flaw detection device for the end of a large-diameter seamless pipe according to claim 7, characterized in that, The shaft fork (933) has a guide key that is vertically detachably connected to the large end of the shaft. The connecting seat (931) is vertically provided with a guide keyway for keying the guide keyway. There is a first gap between the guide keyway and the guide keyway. The small end of the shaft of the shaft fork (933) passes through the self-lubricating bearing (932) and is then fitted with a retaining ring (934) and a first elastic member in sequence. The two ends of the first elastic member abut against the lower end face of the retaining ring (934) and the lower part of the connecting seat (931), respectively. The two ends of the connecting shaft (935) are rotatably connected to the fork of the shaft fork (933), and there is a second gap between the lower end face of the probe (938) and the fork of the shaft fork (933). The lower part of the probe (938) is sleeved on the connecting shaft (935). Both ends of the probe (938) are provided with a second elastic element (936) for sleeved on the connecting shaft (935) and a fastening nut (937) for threaded connection on the connecting shaft (935). The two ends of the second elastic element (936) abut against the probe (938) and the fastening nut (937) respectively.

9. The online flaw detection device for the end of a large-diameter seamless pipe according to claim 7, characterized in that, The probe (938) includes a body, an epoxy resin layer (1000) embedded in the upper part of the body, and a water distribution channel (1200) for supplying ultrasonic coupling agent, the water distribution channel (1200) passing through the body and the epoxy resin layer (1000) with the water distribution end facing upward.

10. The online flaw detection device for the end of a large-diameter seamless pipe according to claim 7, characterized in that, The transverse drive component (910) includes a base (911), on which a lead screw (914) is rotatably connected in the transverse direction and a second rotation drive mechanism (915) for driving the lead screw (914) to rotate is fixedly connected. A lead screw nut (913) is threaded onto the lead screw (914), and a slide block (912) is fixedly connected to the lead screw nut (913). The lower part of the slide block (912) is slidably connected in the transverse direction to the base (911). The vertical drive component (920) includes a linear drive mechanism (921) and two parallel connecting rods (922). Both ends of the linear drive mechanism (921) are respectively hinged to the slide (912) and the connecting seat (931) in the longitudinal direction. The lower ends of the two connecting rods (922) are both hinged to the slide (912) at the same height in the longitudinal direction, and the upper ends of the two connecting rods (922) are both hinged to the connecting seat (931) at the same height in the longitudinal direction.

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