A seamless steel tube non-destructive ultrasonic inspection apparatus and method

Abstract

The application discloses a seamless steel pipe nondestructive ultrasonic flaw detection equipment and method, belongs to the technical field of workpiece detection, and is used for providing a seamless steel pipe nondestructive ultrasonic flaw detection equipment with better efficiency and higher precision and a method using the flaw detection equipment, comprising a rack, a feeding mechanism arranged on the rack, a pushing and discharging mechanism arranged at a discharging end of the feeding mechanism, a vertical flaw detection pipe arranged above the pushing and discharging mechanism and the feeding mechanism, an ultrasonic transceiver arranged in a vacuum partition layer separating the inside and the outside of the flaw detection pipe, and a resetting mechanism arranged above the flaw detection pipe. The utility model is characterized in that the flaw detection pipe is designed to have a multilayer structure, and the ultrasonic reflector and the ultrasonic receiver are arranged to be separated from each other in the flaw detection pipe; the ultrasonic transmitter can move along the inner wall of the seamless steel pipe, the ultrasonic receiver can move along the outer wall of the seamless steel pipe, the material uniformity of the seamless steel pipe in each direction can be accurately detected, and the flaw detection precision of the seamless steel pipe is greatly improved.

Description

Technical Field

[0001] This application relates to the field of workpiece inspection technology, and in particular to a non-destructive ultrasonic testing device and method for seamless steel pipes. Background Technology

[0002] Currently, seamless steel pipes are mostly used as oil and gas geological drilling pipes, cracking pipes for petrochemicals, boiler tubes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation. In order to ensure that seamless steel pipes can work stably for a long time, damage detection is required after the steel pipes are produced, including whether there are cracks and whether the material of the pipe wall is uniform. Manual inspection methods have low accuracy and low efficiency, so flaw detection equipment is needed.

[0003] Existing seamless steel pipe flaw detection equipment mostly uses ultrasonic flaw detection. By passing ultrasonic waves through the wall of the seamless steel pipe, the changes in sound waves before and after passage can be compared to determine whether there are any defects in the seamless steel pipe. However, existing flaw detection equipment can only detect on the outside of the seamless steel pipe, using the reflection of sound waves to determine whether there is damage to the pipe wall. Although this detection reflection is highly efficient, its accuracy is low. It is necessary to increase the threshold for damage determination in order to ensure that the seamless steel pipe has a high pass rate. Summary of the Invention

[0004] The purpose of this application is to provide a non-destructive ultrasonic testing device for seamless steel pipes that is more efficient and has higher accuracy, as well as a method for using the testing device.

[0005] To achieve the above objectives, this application provides a non-destructive ultrasonic testing device for seamless steel pipes: including a frame, a feeding mechanism on the frame, steel pipes to be tested arranged inside the feeding mechanism, a pushing mechanism at the discharge end of the feeding mechanism, a vertical testing tube above the pushing mechanism and the feeding mechanism, the pushing mechanism being adapted to vertically push the steel pipes into the testing tube, the testing tube having a vacuum layer between the inside and outside of the inserted steel pipe, an ultrasonic transceiver being arranged within the vacuum layer separating the inside and outside of the testing tube, adapted to detect defects in the steel pipe, and a reset mechanism above the testing tube, adapted to move the ultrasonic transceiver to an initial position.

[0006] As a preferred embodiment, the flaw detection tube comprises an inner tube, a middle tube, and an outer tube that are coaxial and expand sequentially from the inside out. The lower end of the inner tube has a bottom sealing disc, and the upper ends of the inner tube and the middle tube are fixedly connected to a top sealing ring. The lower ends of the middle tube and the outer tube are fixedly connected to a bottom sealing ring. A steel tube cavity with an open lower end is formed between the inner tube and the middle tube, which is suitable for accommodating the steel tube body. Flaw detection can be performed on the steel tube body inside the flaw detection tube.

[0007] As a preferred embodiment, the reset mechanism includes a longitudinal hydraulic cylinder, into which a vertically downward extending telescopic rod and a telescopic sleeve are inserted. The telescopic rod is located within the telescopic sleeve and is coaxial. A sealing ring is provided on the upper inner wall of the inner tube, suitable for tightly fitting with the outer side of the telescopic rod to form a sealing structure. An intermediate cavity with an air density of less than 10% is formed inside the inner tube. Sealing rings are also provided on the outer wall of the middle tube and the inner wall of the outer tube near their upper ends, suitable for tightly fitting with the inner and outer walls of the telescopic sleeve to form a sealing structure. An outer cavity with an air density of less than 10% is formed between the middle tube and the outer tube. The frame includes a back plate, and the hydraulic cylinder is fixedly connected to the back plate through a connecting sleeve. A limiting plate and a clamping claw are fixedly connected to the side of the back plate facing the flaw detection tube. A connecting plate is fixedly connected to the top of the outer tube, and a connecting hole is provided on the connecting plate for the connecting piece to pass through and be fixedly connected to the limiting plate. The clamping claw is suitable for clamping the flaw detection tube to improve its stability.

[0008] As a preferred embodiment, the ultrasonic transceiver includes an ultrasonic transmitter and an ultrasonic receiver. The ultrasonic transmitter is disposed in the intermediate cavity with a gap between it and the inner wall of the inner tube. The ultrasonic receiver is annular and disposed in the peripheral cavity with gaps between it and the outer wall of the intermediate tube and the inner wall of the outer tube. The outer side of the ultrasonic transmitter has a sound wave emitting groove, and the inner wall of the ultrasonic receiver has a sound wave receiving groove to facilitate the transmission of ultrasonic waves.

[0009] As a preferred embodiment, the lower end of the telescopic rod is provided with a circular electromagnetic handle, and the lower end of the telescopic sleeve is provided with an annular electromagnetic ring. Excitation coils are disposed inside the electromagnetic handle and the electromagnetic ring. A ferromagnetic material sheet is disposed on the top of the ultrasonic transmitter, suitable for being attracted by the electromagnetic handle. Similarly, a ferromagnetic material sheet is disposed on the top of the ultrasonic receiver, suitable for being attracted by the electromagnetic ring. Both the telescopic rod and the telescopic sleeve have retaining rings at their lower ends, and the upper surfaces of the electromagnetic handle and the electromagnetic ring are provided with retaining grooves, suitable for engaging with the retaining rings to form a locking structure. Electrode grooves are provided on both end faces. The upper end face of the ultrasonic transmitter is provided with a transmitter electrode, which is suitable for electrical connection with the electrode groove at the lower end of the electromagnetic handle. The upper end face of the ultrasonic receiver is provided with a receiver electrode, which is suitable for electrical connection with the electrode groove at the lower end of the electromagnetic ring. The inner tube, middle tube and outer tube are made of insulating material. The inner bottom surface of the intermediate cavity and the outer cavity is provided with a soft pad. The soft pad includes a damping disc provided on the upper surface of the bottom sealing disc and a damping ring provided on the upper surface of the bottom sealing ring to reduce the impact of the ultrasonic transmitter and ultrasonic receiver.

[0010] As a preferred embodiment, the frame further includes a wheel frame, and the pushing mechanism includes a pair of rollers arranged vertically, the rollers being rotatably connected to the wheel frame. A belt is externally connected to the two rollers, the belt having longitudinal sides and a groove on its outer surface. A replacement post is placed within the groove, the length of which is greater than the length of the steel pipe, and the length of the belt minus the length of the replacement post is greater than the length of the steel pipe. A motor and a reducer are arranged on the outer surface of the wheel frame, the motor driving the rollers to rotate via the reducer. A roller is also rotatably connected to the wheel frame, suitable for providing support force to the inner wall of the side of the belt that can contact the steel pipe, preventing subsequent steel pipes awaiting inspection from interfering with the steel pipes actually being inspected.

[0011] As a preferred embodiment, the feeding mechanism is fixedly connected to the frame. The feeding mechanism includes a smoothly transitioning arc slide and a horizontal slide. The steel pipes in the horizontal slide are all in a vertical position. The end of the arc slide away from the horizontal slide is higher. The distance between the end of the horizontal slide away from the arc slide and the belt is greater than one time the diameter of the steel pipe and less than twice the diameter of the steel pipe, so as to facilitate the removal of the inspected steel pipes from the pushing mechanism.

[0012] As a preferred embodiment, a diversion mechanism is provided below the pushing mechanism and the feeding mechanism. The diversion mechanism includes a defective product slide and a good product slide. Both the defective product slide and the good product slide include inclined plates with a higher relative end and a lower distant end. A baffle fixedly connected to the frame is provided on the opposite side of the inclined plates. A dividing plate is provided between the two inclined plates and located directly below the pushing mechanism and the feeding mechanism. Both ends of the dividing plate have end shafts rotatably connected to the baffles. A cylinder is fixedly connected to the outer side of the baffle. A connecting rod is hinged to the movable end of the cylinder. A swing arm is hinged to the other end of the connecting rod. A pin hole is provided at the other end of the swing arm. One of the end shafts passes through the baffle and is fixedly connected to a pin. The pin passes through the pin hole and is fixedly connected to a limit ring, forming a stable crank-slider mechanism.

[0013] This application also provides a flaw detection method using a non-destructive ultrasonic flaw detection device for seamless steel pipes, the specific steps of which are as follows:

[0014] S1. The steel pipe located on the far left of the horizontal slide is pressed against the groove side of the belt by the pressure of the other steel pipes on the right.

[0015] S2. The belt drives the replacement column to rotate together, and the replacement column pushes the leftmost steel pipe into the steel pipe cavity of the flaw detection tube until the upper end of the replacement column abuts against the bottom of the flaw detection tube.

[0016] S3. The electromagnetic handle and electromagnetic ring together stop supplying power to the internal excitation coil, and simultaneously release the ultrasonic transmitter and ultrasonic receiver. At the same time, the ultrasonic transmitter starts to emit ultrasonic waves and the ultrasonic receiver starts to receive ultrasonic waves. The two fall synchronously in the vacuum cavity with the same acceleration, maintaining an almost identical height, until they fall onto the soft pad at the same time.

[0017] S4. The ultrasonic receiver determines whether the side wall material of the steel pipe body that it passes during the descent is uniform. If it is not uniform, the ultrasonic transmitter and ultrasonic receiver remain on. When the electromagnetic handle and electromagnetic ring of the reset mechanism descend and come into contact with them for charging, the non-uniform signal is transmitted to the main control computer. The reset mechanism lifts the ultrasonic transmitter and ultrasonic receiver upward at a constant speed to determine the position and length of the steel pipe body where the material is non-uniform, and proceeds to S5. If the detection result is uniform, the ultrasonic transmitter and ultrasonic receiver immediately turn off after stopping. When they come into contact with the lower end of the reset mechanism, the qualified signal of the steel pipe is transmitted to the main control computer. Then, under the magnetic attraction of the excitation coil, they quickly return to the upper limit position, and proceeds to S6.

[0018] S5. Driven by the cylinder, the upper end of the dispensing plate deflects toward one side of the genuine product slide.

[0019] S6. Driven by the cylinder, the upper end of the dispensing plate deflects toward one side of the defective product slide.

[0020] S7. The belt rotates in the reverse direction, and the steel pipe inside the flaw detection tube falls under its own weight. If the material of the steel pipe is not uniform, it falls onto the defective product slide; if the material of the steel pipe is uniform, it falls onto the good product slide.

[0021] S8. The belt rotates forward again, returning to S1.

[0022] As a preferred embodiment, in step S2, the belt is made of rubber, the replacement column is made of plastic, the length of the replacement column is 105% to 120% of the length of the steel pipe, and the length of the belt is 200% to 220% of the length of the replacement column.

[0023] As a further preferred embodiment, electrical structures such as an acceleration sensor, a battery, a memory, and a controller are disposed inside the housing of the ultrasonic transmitter and the ultrasonic receiver.

[0024] Compared with the prior art, the beneficial effects of this application are as follows:

[0025] (1) By designing a flaw detection tube with a multi-layer structure and setting up an ultrasonic reflector and ultrasonic receiver that are separated from each other in the flaw detection tube, the ultrasonic transmitter can move along the inner wall of the seamless steel pipe and the ultrasonic receiver can move along the outer wall of the seamless steel pipe. The ultrasonic reflector and ultrasonic receiver move in a cavity with almost a vacuum. Without power drive, they can ensure high alignment by relying only on their own free fall. This allows for accurate detection of the material uniformity of the seamless steel pipe wall in all directions, which greatly improves the flaw detection accuracy of the seamless steel pipe.

[0026] (2) Since the ultrasonic reflector and ultrasonic receiver fall freely in a straight line, the falling speed is very fast, so even for very long seamless steel pipes, the detection can be completed quickly, and the detection efficiency is high. Attached Figure Description

[0027] Figure 1 This is a first three-dimensional schematic diagram of the overall structure of the non-destructive ultrasonic flaw detection equipment for seamless steel pipes.

[0028] Figure 2 This is a second three-dimensional schematic diagram of the overall structure of the seamless steel pipe non-destructive ultrasonic flaw detection equipment.

[0029] Figure 3 This is a three-dimensional view of the seamless steel pipe non-destructive ultrasonic flaw detection equipment after the reset mechanism has been removed.

[0030] Figure 4 This is a schematic diagram of the transmission of the pushing mechanism of the non-destructive ultrasonic testing equipment for seamless steel pipes.

[0031] Figure 5 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 4 A 3D view after removing one side panel.

[0032] Figure 6 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 5 A 3D view after removing the baffle and sloping plate.

[0033] Figure 7 This is a schematic diagram of the transmission structure of the diversion mechanism of the non-destructive ultrasonic testing equipment for seamless steel pipes.

[0034] Figure 8 This is a three-dimensional structural diagram of the sorting plate of the non-destructive ultrasonic flaw detection equipment for seamless steel pipes.

[0035] Figure 9 This is a three-dimensional structural diagram of the genuine slide rail for the non-destructive ultrasonic flaw detection equipment for seamless steel pipes.

[0036] Figure 10 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 9 A magnified view of part A.

[0037] Figure 11 This is a schematic diagram showing the coordination between the reset mechanism and the feeding mechanism of the non-destructive ultrasonic testing equipment for seamless steel pipes.

[0038] Figure 12 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 11 A 3D diagram after removing the scrolling structure.

[0039] Figure 13 This is a schematic diagram showing the correspondence between the steel pipe body and the testing tube of the non-destructive ultrasonic flaw detection equipment for seamless steel pipes.

[0040] Figure 14 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 13 A magnified view of section B.

[0041] Figure 15 This is a three-dimensional sectional view of the reset mechanism and the testing tube of the non-destructive ultrasonic flaw detection equipment for seamless steel pipes.

[0042] Figure 16 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 15 A magnified view of a portion of point C.

[0043] Figure 17 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 15 A magnified view of a portion of point D.

[0044] Figure 18 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 15 A magnified view of a portion at point E.

[0045] Figure 19 This is a three-dimensional cross-sectional view of the flaw detection tube of the non-destructive ultrasonic flaw detection equipment for seamless steel pipes.

[0046] Figure 20 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 19 A magnified view of a portion at point F.

[0047] Figure 21 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 19 A magnified view of a portion of point G.

[0048] Figure 22 This is a first three-dimensional view of the ultrasonic transceiver of the non-destructive ultrasonic testing equipment for seamless steel pipes.

[0049] Figure 23 This is a second three-dimensional view of the ultrasonic transceiver of the non-destructive ultrasonic testing equipment for seamless steel pipes.

[0050] Figure 24This is a three-dimensional sectional view of the reset mechanism of the non-destructive ultrasonic testing equipment for seamless steel pipes.

[0051] Figure 25 For the non-destructive ultrasonic testing equipment of the seamless steel pipe Figure 24 A magnified view of a portion of point H.

[0052] Figure 26 This is a diagram showing the positional correspondence of the end structure of the reset mechanism in the non-destructive ultrasonic testing equipment for seamless steel pipes.

[0053] Figure 27 This is a three-dimensional sectional view of the end structure of the reset mechanism of the seamless steel pipe non-destructive ultrasonic testing equipment.

[0054] Figure 28 A flowchart illustrating the flaw detection method using non-destructive ultrasonic testing equipment for seamless steel pipes.

[0055] In the diagram: 1. Steel pipe body; 2. Flaw detection tube; 201. Inner layer pipe; 202. Middle layer pipe; 203. Outer layer pipe; 204. Bottom sealing disc; 205. Bottom sealing ring; 206. Top sealing ring; 207. Connecting disc; 208. Connecting hole; 209. Sealing ring; 210. Steel pipe cavity; 211. Intermediate cavity; 212. Outer cavity; 3. Pushing mechanism; 301. Motor; 302. Reducer; 303. Belt; 304. Replacement column; 305. Roller; 306. Roller; 4. Diverting mechanism; 401. Defective product slide; 402. Good product slide; 403. Cylinder; 404. Connecting rod; 405. Swing arm; 406. End shaft; 407. Diverting plate; 408. Baffle; 409. Inclined plate; 41 0. Pin; 411. Limiting ring; 412. Pin hole; 5. Reset mechanism; 501. Hydraulic cylinder; 502. Connecting sleeve; 503. Telescopic rod; 504. Telescopic sleeve; 505. Electromagnetic handle; 506. Electromagnetic ring; 507. Electrode groove; 508. Snap ring; 509. Snap groove; 6. Feeding mechanism; 601. Arc slide; 602. Horizontal slide; 7. Frame; 701. Back plate; 702. Wheel frame; 703. Limiting plate; 704. Clamping claw; 8. Ultrasonic transceiver; 810. Ultrasonic transmitter; 811. Acoustic wave emitting groove; 812. Transmitter electrode; 820. Ultrasonic receiver; 821. Acoustic wave receiving groove; 822. Receiver electrode; 9. Soft pad; 901. Vibration damping disc; 902. Vibration damping ring. Detailed Implementation

[0056] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0057] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and should not be construed as limiting the specific protection scope of this application.

[0058] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0059] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0060] like Figure 1-27 The seamless steel pipe non-destructive ultrasonic flaw detection equipment shown includes a frame 7 that provides the main fixed support. A feeding mechanism 6 is installed on the frame 7, and steel pipes 1 to be tested are arranged inside the feeding mechanism 6. The feeding mechanism 6 is used to transport the steel pipes 1 to the testing area. The feeding mechanism 6 is fixedly connected to the frame 7 to ensure its own stability. The feeding mechanism 6 includes a smoothly transitioned arc slide 601 and a horizontal slide 602. The steel pipes 1 in the horizontal slide 602 are all in a vertical state. The end of the arc slide 601 away from the horizontal slide 602 is higher, which makes it easier for the steel pipes 1 to slide automatically into the horizontal slide 602 by their own weight, and provides a pre-pressure to the steel pipes 1 in the horizontal slide 602 to maintain their vertical state.

[0061] The feeding mechanism 6 has a pushing mechanism 3 at its discharge end, used to vertically push the steel pipe 1 into the flaw detection tube 2. The frame 7 includes a wheel frame 702, and the pushing mechanism 3 includes a pair of rollers 305 arranged vertically. The rollers 305 are rotatably connected to the wheel frame 702. The two rollers 305 are externally connected to a belt 303. The belt 303 is made of rubber material, which has good flexibility and a high surface friction coefficient. The two sides of the belt 303 are longitudinal, and the outer side of the belt 303 has a groove. A replacement post 304 is set in the groove of the belt 303. When the leftmost steel pipe 1 rises or falls, it replaces the leftmost steel pipe 1 and contacts the next steel pipe 1 to provide support for the following steel pipe 1. It should be noted that the replacement post 304 is made of plastic. Plastic has a certain degree of flexibility to adapt to the bending of the belt 303. At the same time, the surface friction coefficient is small. Therefore, the relative sliding friction force when in contact with the side of the steel pipe 1 is small. As for lifting the next steel pipe 1, the length of the replacement column 304 is greater than the length of the steel pipe 1. The diameter of the replacement column 304 should be slightly larger than the diameter of the steel pipe 1, by a few millimeters. This can prevent the rising steel pipe 1 from colliding with the end of the nearest steel pipe 1 below, making it difficult to descend normally. The length of the belt 303 minus the length of the replacement column 304 is greater than the length of the steel pipe 1. Generally, the length of the replacement column 304 is 105% to 120% of the length of the steel pipe 1, and the length of the belt 303 is 200% to 220% of the length of the replacement column 304. Since the actual length of the steel pipe 1 that needs to be inspected may vary, the model of the inspection equipment used will also be different. In order to reduce the cost of using the equipment and ensure normal inspection work, in this embodiment, the length of the replacement column 304 is taken as 108% of the length of the suitable steel pipe 1, and the length of the belt 303 is taken as 200% of the length of the replacement column 304.

[0062] The outer side of the wheel frame 702 is equipped with a motor 301 and a reducer 302. The motor 301 drives the roller 305 to rotate at a lower speed and a larger torque through the reducer 302. The wheel frame 702 is also rotatably connected to a roller 306, which is suitable for providing support force to the inner wall of the side of the belt 303 that can contact the steel pipe body 1, and preventing the belt 303 from being squeezed and deformed by multiple steel pipe bodies 1. The distance between the end of the horizontal slide 602 away from the arc slide 601 and the belt 303 is greater than one times the diameter of the steel pipe body 1 and less than twice the diameter of the steel pipe body 1. Usually, 1.25 times is sufficient.

[0063] A vertical flaw detection tube 2 is installed above the pushing mechanism 3 and the feeding mechanism 6. Its interior is the working space for flaw detection of the steel pipe body 1. The flaw detection tube 2 has vacuum partitions inside and outside the inserted steel pipe body 1. These partitions are formed by the flaw detection tube 2 comprising an inner tube 201, a middle tube 202, and an outer tube 203, which are coaxial and expand sequentially from the inside out. The inner tube 201, middle tube 202, and outer tube 203 need to be made of insulating material. The lower end of the inner tube 201 has a bottom sealing disc 204. The inner tube 201 and the middle tube 202... A top sealing ring 206 is fixedly connected to the upper end of the tube, and a bottom sealing ring 205 is fixedly connected to the lower end of the middle tube 202 and the outer tube 203. In this embodiment, the bottom sealing disc 204, the bottom sealing ring 205 and the top sealing ring 206 are integrally formed with the inner tube 201, the middle tube 202 and the outer tube 203. They are made of transparent tempered glass. A steel tube cavity 210 with an open lower end is formed between the inner tube 201 and the middle tube 202, which is suitable for accommodating the steel tube body 1. After the steel tube body 1 is inserted into the steel tube cavity 210, the flaw detection operation can be performed.

[0064] The flaw detection tube 2 has an ultrasonic transceiver 8 installed within a vacuum partition separating the inner and outer layers. This transceiver is suitable for detecting defects in the steel pipe body 1. Specifically, the ultrasonic transceiver 8 includes a separate ultrasonic transmitter 810 and an ultrasonic receiver 820. The ultrasonic transmitter 810 is located within the intermediate cavity 211, with a gap between it and the inner wall of the inner tube 201. Because the intermediate cavity 211 contains almost no air, the ultrasonic transmitter 810 can remain horizontal during its descent and does not contact the inner wall of the inner tube 201. The ultrasonic receiver 820 is annular and located within the outer cavity 212. A gap is left between the outer wall of the middle tube 202 and the inner wall of the outer tube 203. Similarly, the ultrasonic receiver 820 can maintain its horizontal state during the fall and does not contact the tube walls of the middle tube 202 and the outer tube 203. The outer side of the ultrasonic transmitter 810 is provided with annularly arranged sound wave emitting grooves 811 to facilitate the propagation of sound waves from the ultrasonic transmitter 810 housing. The inner wall of the ultrasonic receiver 820 is provided with annularly arranged sound wave receiving grooves 821 to facilitate the sound waves entering the ultrasonic receiver 820 housing and acting on the built-in sound wave probe.

[0065] A reset mechanism 5 is provided above the flaw detection tube 2, suitable for moving the ultrasonic transceiver 8 to its initial position. The specific structure of the reset mechanism 5 includes a longitudinal hydraulic cylinder 501, in which a vertically downward extending telescopic rod 503 and a telescopic sleeve 504 are inserted. The telescopic rod 503 is located inside the telescopic sleeve 504 and is coaxial. It should be noted that this is an uncommon hydraulic telescopic structure. The upper end of the telescopic sleeve 504 inside the hydraulic cylinder 501 has a through hole communicating with the inside of the hydraulic cylinder 501, allowing hydraulic oil to enter the space between the telescopic rod 503 and the telescopic sleeve 504 to provide hydraulic pressure when the telescopic rod 503 and the telescopic sleeve 504 retract. The upper inner wall of the inner tube 201 is provided with A sealing ring 209 is provided, which is suitable for tightly fitting with the outer surface of the telescopic rod 503 to form a sealing structure. In this way, an intermediate cavity 211 with an air density of less than 10% can be stably formed inside the inner tube 201. Sealing rings 209 are also provided near the upper end of the outer wall of the middle tube 202 and the inner wall of the outer tube 203, which are suitable for tightly fitting with the inner and outer walls of the telescopic sleeve 504 to form a sealing structure. Similarly, an outer cavity 212 with an air density of less than 10% can be stably formed between the middle tube 202 and the outer tube 203. An air density of less than 10% of the air density under natural conditions is generally understood as a vacuum state. Under reasonable control, when the telescopic rod 503 and the telescopic sleeve 504 are at their upper limits, the cavity... The air density inside the cavity reaches 5% of the external air density. Since this is not a complete vacuum, the thin air can be used as a medium for sound propagation. Furthermore, the extremely low air density means that the ultrasonic transmitter 810 and ultrasonic receiver 820 experience negligible air resistance during descent. Therefore, they can maintain a consistent height during this short descent distance, completing the transmission of ultrasonic signals. When the telescopic rod 503 and telescopic sleeve 504 descend, the internal space of the cavity is compressed, causing the air density inside the cavity to increase, potentially approaching 10%. However, under the traction of the telescopic rod 503 and telescopic sleeve 504, the air density within the cavity will remain relatively constant. The 504 sleeve can maintain synchronous ascent, eliminating the need to consider air resistance. On the other hand, the inner bottom surfaces of the intermediate cavity 211 and the outer cavity 212 are equipped with soft pads 9, which effectively reduces the impact when the ultrasonic transmitter 810 and ultrasonic receiver 820 fall to the bottom, resulting in very little impact noise. The soft pads 9 specifically include a vibration damping disc 901 set on the upper surface of the bottom sealing disc 204 and a vibration damping ring 902 set on the upper surface of the bottom sealing ring 205. The vibration damping disc 901 and vibration damping ring 902 are not made of highly elastic materials such as rubber, but are made of materials such as sponge or memory foam that will sink under pressure, which can better absorb the impact when falling and produce almost no noise.

[0066] The lower end of the telescopic rod 503 is provided with a circular electromagnetic handle 505, and the lower end of the telescopic sleeve 504 is provided with an annular electromagnetic ring 506. Excitation coils are installed inside the electromagnetic handle 505 and the electromagnetic ring 506. A ferromagnetic material sheet is provided on the top of the ultrasonic transmitter 810, which can be attracted by the electromagnetic handle 505. Similarly, a ferromagnetic material sheet is provided on the top of the ultrasonic receiver 820, which can be attracted by the electromagnetic ring 506. Once magnetically fixed, the ultrasonic transmitter 810 and ultrasonic receiver 820 can rise together with the telescopic rod 503 and the telescopic sleeve 504. The lower ends of both the telescopic rod 503 and the telescopic sleeve 504 have retaining rings 508. The upper surfaces of the electromagnetic handle 505 and the electromagnetic ring 506 are each provided with a retaining groove 509, suitable for engaging with the retaining rings 508 to form a locking structure, ensuring the stability of the electromagnetic handle 505 and the electromagnetic ring 506, and facilitating disassembly. Installation, replacement, and maintenance: Electrode grooves 507 are provided on the lower end faces of both the electromagnetic handle 505 and the electromagnetic ring 506. The upper end face of the ultrasonic transmitter 810 is provided with a transmitter electrode 812, which is suitable for engaging and electrically connecting with the electrode groove 507 at the lower end of the electromagnetic handle 505 to charge the ultrasonic transmitter 810. The upper end face of the ultrasonic receiver 820 is provided with a receiver electrode 822, which is suitable for engaging and electrically connecting with the electrode groove 507 at the lower end of the electromagnetic ring 506, also for charging the ultrasonic receiver 820. During use, the ultrasonic transmitter 810 and the ultrasonic receiver 820 are equipped with electrical components such as an acceleration sensor, battery, memory, and controller inside their housings to achieve automatic power supply and operation control, as well as data recording. The electrodes are not only used to acquire electrical energy, but also to transmit electrical signals, and the transmission is carried out after the magnetic field environment is stable to ensure the accuracy of the signal.

[0067] The frame 7 also includes a back plate 701. The hydraulic cylinder 501 is fixedly connected to the back plate 701 through a connecting sleeve 502 to ensure its own stability. The back plate 701 is fixedly connected to a limiting plate 703 and a clamping claw 704 on the side facing the flaw detection tube 2. A connecting plate 207 is fixedly connected to the top of the outer tube 203. A connecting hole 208 is opened on the connecting plate 207 for the connecting piece to pass through and be fixedly connected to the limiting plate 703 to ensure the connection strength of the flaw detection tube 2, thereby ensuring that the height of the flaw detection tube 2 remains unchanged. There are generally several clamping claws 704, which are used to clamp the flaw detection tube 2, and generally clamp the middle and near the bottom of the outer tube 203.

[0068] To distinguish between qualified and defective products, a diversion mechanism 4 is installed below the pushing mechanism 3 and the feeding mechanism 6. The diversion mechanism 4 is fixedly connected to the frame 7. The diversion mechanism 4 includes a defective product slide 401 and a qualified product slide 402. Both the defective product slide 401 and the qualified product slide 402 include inclined plates 409 with the opposite end higher and the far end lower, which facilitates the automatic sliding of the steel pipe 1. A baffle 408 fixedly connected to the frame 7 is provided on the opposite side of the inclined plate 409 to prevent the steel pipe 1 on the inclined plate 409 from rolling off from the side. A separating plate 407 is provided between the two inclined plates 409 and located directly below the pushing mechanism 3 and the feeding mechanism 6 to guide the falling steel pipe 1. The steel pipe body 1 is guided to the corresponding slide. The two ends of the dispensing plate 407 have end shafts 406 that are rotatably connected to the baffle 408. The outer side of the baffle 408 is fixedly connected to the cylinder 403. The movable end of the cylinder 403 is hinged to the connecting rod 404. The other end of the connecting rod 404 is hinged to the swing arm 405. The other end of the swing arm 405 is provided with a pin hole 412. One of the end shafts 406 passes through the baffle 408 and is fixedly connected to the pin 410. The pin 410 passes through the pin hole 412 and is fixedly connected to the limit ring 411, forming a crank-slider mechanism. When the movable end of the cylinder 403 extends or retracts, the dispensing plate 407 will rotate accordingly.

[0069] like Figure 28 As shown, the method for using the seamless steel pipe non-destructive ultrasonic testing equipment is as follows:

[0070] In the first step, the leftmost steel pipe 1 located in the horizontal slide 602 is pressed against the groove side of the belt 303 by the pressure of the other steel pipes 1 on the right.

[0071] The second step is that the belt 303 rotates counterclockwise, causing the replacement column 304 to rotate together. The right end of the replacement column 304 pushes the leftmost steel pipe body 1 into the steel pipe cavity 210 of the flaw detection tube 2 until the upper end of the replacement column 304 presses against the bottom of the flaw detection tube 2.

[0072] Third, the electromagnetic handle 505 and the electromagnetic ring 506 together stop supplying power to the internal excitation coil, and simultaneously release the ultrasonic transmitter 810 and the ultrasonic receiver 820. At the same time, the ultrasonic transmitter 810 starts to emit ultrasonic waves and the ultrasonic receiver 820 starts to receive ultrasonic waves. The two fall synchronously in the vacuum cavity with the same acceleration, and the height remains almost the same until they fall onto the soft pad 9 at the same time.

[0073] In the fourth step, the ultrasonic receiver 820 determines whether the side wall material of the steel pipe 1 that it passes by during the fall is uniform by measuring the uniformity of the received ultrasonic signal. If it is not uniform, the ultrasonic transmitter 810 and the ultrasonic receiver 820 remain on. When the electromagnetic handle 505 and electromagnetic ring 506 of the reset mechanism 5 descend and come into contact with them for charging, the non-uniform signal is transmitted to the main control computer of the device. The reset mechanism 5 lifts the ultrasonic transmitter 810 and the ultrasonic receiver 820 upward at a uniform speed, thereby further determining the location and length of the non-uniform material in the steel pipe 1, and then proceeds to the fifth step. If the detection result is uniform, the ultrasonic transmitter 810 and the ultrasonic receiver 820 immediately shut down and stop working after falling onto the soft pad 9. When they come into contact with the lower end of the reset mechanism 5, they transmit the qualified signal of the steel pipe to the main control computer, and then quickly return to the upper limit under the magnetic attraction of the excitation coil, and proceed to the sixth step.

[0074] Fifth step, driven by cylinder 403, the upper end of the dispensing plate 407 deflects to one side of the genuine slide rail 402;

[0075] The sixth step is that, driven by cylinder 403, the upper end of the dispensing plate 407 deflects to one side of the defective product slide 401.

[0076] Step 7: When belt 303 rotates in the reverse direction, that is, clockwise, the steel pipe 1 inside the flaw detection tube 2 loses the support of the substitute column 304 and falls under its own weight. If the material of the steel pipe 1 is not uniform, it will fall onto the defective product slide 401 under the guidance of the separating plate 407; if the material of the steel pipe is uniform, it will fall onto the good product slide 402 under the guidance of the separating plate 407, thus separating qualified products from defective products.

[0077] Step 8: Belt 303 rotates forward again, and we can return to step 1 to begin the next round of flaw detection.

[0078] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A non-destructive ultrasonic testing device for seamless steel pipes, characterized in that: Includes a frame (7), on which a feeding mechanism (6) is provided, in which steel pipes (1) to be tested are arranged, and a pushing mechanism (3) is provided at the discharge end of the feeding mechanism (6). A vertical flaw detection tube (2) is provided above the pushing mechanism (3) and the feeding mechanism (6). The pushing mechanism (3) is adapted to push the steel pipes (1) vertically into the flaw detection tube (2). The flaw detection tube (2) has a vacuum layer inside and outside the inserted steel pipe (1). An ultrasonic transceiver (8) is provided in the vacuum layer inside and outside the flaw detection tube (2), which is adapted to detect defects in the steel pipe (1). A reset mechanism (5) is provided above the flaw detection tube (2), which is adapted to move the ultrasonic transceiver (8) to the initial position. The flaw detection tube (2) includes an inner tube (201), a middle tube (202) and an outer tube (203) that are coaxial and expand from the inside to the outside. The lower end of the inner tube (201) has a bottom sealing disc (204). The upper ends of the inner tube (201) and the middle tube (202) are fixedly connected to a top sealing ring (206). The lower ends of the middle tube (202) and the outer tube (203) are fixedly connected to a bottom sealing ring (205). A steel tube cavity (210) with an open lower end is formed between the inner tube (201) and the middle tube (202), which is suitable for accommodating the steel tube body (1). The reset mechanism (5) includes a longitudinal hydraulic cylinder (501), into which a vertically extending telescopic rod (503) and a telescopic sleeve (504) are inserted. The telescopic rod (503) is located inside the telescopic sleeve (504) and is coaxial. A sealing ring (209) is provided on the upper inner wall of the inner tube (201), which is suitable for tightly fitting with the outer side of the telescopic rod (503) to form a sealing structure. An intermediate cavity (211) with an air density of less than 10% is formed inside the inner tube (201). The outer wall of the middle tube (202) and the inner wall of the outer tube (203) are also provided with sealing rings (209) near the upper end, which are suitable for fitting with the inner and outer walls of the telescopic sleeve (504). The two layers are tightly fitted to form a sealed structure, and an outer cavity (212) with an air density of less than 10% is formed between the middle tube (202) and the outer tube (203); the frame (7) includes a back plate (701), the hydraulic cylinder (501) is fixedly connected to the back plate (701) through a connecting sleeve (502), the back plate (701) is fixedly connected to a limiting plate (703) and a clamping claw (704) on the side facing the flaw detection tube (2), the top of the outer tube (203) is fixedly connected to a connecting plate (207), the connecting plate (207) is provided with a connecting hole (208) for the connecting piece to pass through and be fixedly connected to the limiting plate (703), and the clamping claw (704) is adapted to clamp the flaw detection tube (2); The ultrasonic transceiver (8) includes an ultrasonic transmitter (810) and an ultrasonic receiver (820). The ultrasonic transmitter (810) is disposed in the intermediate cavity (211) with a gap between it and the inner wall of the inner tube (201). The ultrasonic receiver (820) is annular and is disposed in the outer cavity (212) with a gap between it and the outer wall of the middle tube (202) and the inner wall of the outer tube (203). The outer side of the ultrasonic transmitter (810) is provided with a sound wave emitting groove (811), and the inner wall of the ultrasonic receiver (820) is provided with a sound wave receiving groove (821).

2. The seamless steel pipe non-destructive ultrasonic flaw detection equipment as described in claim 1, characterized in that: The lower end of the telescopic rod (503) is provided with a circular electromagnetic handle (505), and the lower end of the telescopic sleeve (504) is provided with an annular electromagnetic ring (506). Excitation coils are provided inside the electromagnetic handle (505) and the electromagnetic ring (506). A ferromagnetic material sheet is provided on the top of the ultrasonic transmitter (810), suitable for being attracted by the electromagnetic handle (505). A ferromagnetic material sheet is also provided on the top of the ultrasonic receiver (820), suitable for being attracted by the electromagnetic ring (506). Both the lower ends of the telescopic rod (503) and the telescopic sleeve (504) have retaining rings (508). The upper surfaces of the electromagnetic handle (505) and the electromagnetic ring (506) are provided with retaining grooves (509), suitable for engaging with the retaining rings (508) to form a locking structure. The electromagnetic handle (505) and the electromagnetic ring (506)... 6) The lower end face of each of the ultrasonic transmitter (810) is provided with an electrode groove (507). The upper end face of the ultrasonic transmitter (810) is provided with a transmitter electrode (812), which is suitable for fitting and electrically connecting with the electrode groove (507) at the lower end of the electromagnetic handle (505). The upper end face of the ultrasonic receiver (820) is provided with a receiver electrode (822), which is suitable for fitting and electrically connecting with the electrode groove (507) at the lower end of the electromagnetic ring (506). The inner tube (201), the middle tube (202) and the outer tube (203) are made of insulating material. The inner bottom surface of the intermediate cavity (211) and the outer cavity (212) is provided with a soft pad (9). The soft pad (9) includes a damping cake (901) provided on the upper surface of the bottom sealing cake (204) and a damping ring (902) provided on the upper surface of the bottom sealing ring (205).

3. The seamless steel pipe non-destructive ultrasonic flaw detection equipment as described in claim 2, characterized in that: The frame (7) also includes a wheel frame (702). The pushing mechanism (3) includes a pair of rollers (305) arranged vertically. The rollers (305) are rotatably connected to the wheel frame (702). The two rollers (305) are externally connected to a belt (303). The two sides of the belt (303) are longitudinal. The outer side of the belt (303) has a groove. A replacement post (304) is provided in the groove of the belt (303). The length of the replacement post (304) is greater than that of the steel pipe body (1). The length of the belt (303) minus the length of the replacement column (304) is greater than the length of the steel pipe body (1); the outer side of the wheel frame (702) is provided with a motor (301) and a reducer (302), the motor (301) drives the roller (305) to rotate through the reducer (302), and the wheel frame (702) is also rotatably connected with a roller (306), which is suitable for providing support force to the inner wall of the side of the belt (303) that can contact the steel pipe body (1).

4. The seamless steel pipe non-destructive ultrasonic flaw detection equipment as described in claim 3, characterized in that: The feeding mechanism (6) is fixedly connected to the frame (7). The feeding mechanism (6) includes a smoothly transitioned arc slide (601) and a horizontal slide (602). The steel pipes (1) in the horizontal slide (602) are all in a vertical state. The end of the arc slide (601) away from the horizontal slide (602) is higher. The distance between the end of the horizontal slide (602) away from the arc slide (601) and the belt (303) is greater than twice the diameter of the steel pipe (1) and less than twice the diameter of the steel pipe (1).

5. The seamless steel pipe non-destructive ultrasonic flaw detection equipment as described in claim 4, characterized in that: A diversion mechanism (4) is provided below the pushing mechanism (3) and the feeding mechanism (6). The diversion mechanism (4) includes a defective product chute (401) and a good product chute (402). Both the defective product chute (401) and the good product chute (402) include inclined plates (409) that are higher at the opposite end and lower at the far end. A baffle (408) fixedly connected to the frame (7) is provided on the opposite side of the inclined plates (409). A partition plate (407) is provided between the two inclined plates (409) and located directly below the pushing mechanism (3) and the feeding mechanism (6). The two ends of the device have end shafts (406) that are rotatably connected to the baffle (408). A cylinder (403) is fixedly connected to the outer side of the baffle (408). A connecting rod (404) is hinged to the movable end of the cylinder (403). A swing arm (405) is hinged to the other end of the connecting rod (404). A pin hole (412) is opened at the other end of the swing arm (405). One of the end shafts (406) passes through the baffle (408) and is fixedly connected to a pin (410). The pin (410) passes through the pin hole (412) and is fixedly connected to a limit ring (411).

6. A flaw detection method using the non-destructive ultrasonic flaw detection equipment for seamless steel pipes as described in claim 5, comprising the following specific steps: S1. The steel pipe located on the far left of the horizontal slide is pressed against the groove side of the belt by the pressure of the other steel pipes on the right. S2. The belt drives the replacement column to rotate together, and the replacement column pushes the leftmost steel pipe into the steel pipe cavity of the flaw detection tube until the upper end of the replacement column abuts against the bottom of the flaw detection tube. S3. The electromagnetic handle and electromagnetic ring together stop supplying power to the internal excitation coil, and simultaneously release the ultrasonic transmitter and ultrasonic receiver. At the same time, the ultrasonic transmitter starts to emit ultrasonic waves and the ultrasonic receiver starts to receive ultrasonic waves. The two fall synchronously in the vacuum cavity with the same acceleration, maintaining an almost identical height, until they fall onto the soft pad at the same time. S4. The ultrasonic receiver determines whether the side wall material of the steel pipe body that it passes during the descent is uniform. If it is not uniform, the ultrasonic transmitter and ultrasonic receiver remain on. When the electromagnetic handle and electromagnetic ring of the reset mechanism descend and come into contact with them for charging, the non-uniform signal is transmitted to the main control computer. The reset mechanism lifts the ultrasonic transmitter and ultrasonic receiver upward at a constant speed to determine the position and length of the steel pipe body where the material is non-uniform, and proceeds to S5. If the detection result is uniform, the ultrasonic transmitter and ultrasonic receiver immediately turn off after stopping. When they come into contact with the lower end of the reset mechanism, the qualified signal of the steel pipe is transmitted to the main control computer. Then, under the magnetic attraction of the excitation coil, they quickly return to the upper limit position, and proceeds to S6. S5. Driven by the cylinder, the upper end of the dispensing plate deflects toward one side of the genuine product slide. S6. Driven by the cylinder, the upper end of the dispensing plate deflects toward one side of the defective product slide. S7. The belt rotates in the reverse direction, and the steel pipe inside the flaw detection tube falls under its own weight. If the material of the steel pipe is not uniform, it falls onto the defective product slide; if the material of the steel pipe is uniform, it falls onto the good product slide. S8. The belt rotates forward again, returning to S1.

7. The flaw detection method using the non-destructive ultrasonic flaw detection equipment for seamless steel pipes as described in claim 5, as described in claim 6, is characterized in that: In step S2, the belt is made of rubber, the replacement column is made of plastic, the length of the replacement column is 105% to 120% of the length of the steel pipe, and the length of the belt is 200% to 220% of the length of the replacement column; the ultrasonic transmitter and ultrasonic receiver are equipped with an acceleration sensor, a battery, a memory and a controller inside their housings.

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