Flaw detection device for pipeline detection and use method

Abstract

The invention provides a flaw detection device for pipeline detection, which comprises a moving assembly, the moving assembly comprises a cylinder, and a roller is arranged on the cylinder; a rotatable connecting cylinder is arranged in the cylinder, an orienting machine is detachably connected in the connecting cylinder, a ray emitting part of the orienting machine is located outside the cylinder and the connecting cylinder, and a first motor used for driving the connecting cylinder to rotate is fixed to the cylinder. According to the invention, the directional machine does not need to repeatedly enter and exit the pipeline and the angle of the directional machine is adjusted to carry out omnibearing detection on the circumferential welding seam of the pipeline, and the detection operation on the circumferential welding seam of the pipeline can be completed through the rotation of the directional machine in the pipeline, so that the detection efficiency of the pipeline is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flaw detection devices, and in particular to a flaw detection device for pipeline inspection and a use method thereof. Background Art

[0002] In pipeline flaw detection, directional X-ray machines (directional X-ray machines) and circumferential X-ray machines (circumferential X-ray machines) are two commonly used X-ray flaw detection equipment. They are mainly used to detect internal defects in pipeline welds (such as pores, slag inclusions, and incomplete penetration). The main difference between them lies in the X-ray emission direction and coverage, and they are suitable for different inspection scenarios.

[0003] The X-rays from the directional machine are directional cone beams, usually irradiating the weld at a certain angle (such as 40° to 60°) or vertically. A single exposure can only cover a local area, making it suitable for small-scale weld inspection or defect inspection at a specific location. The X-rays from the circumferential machine are emitted in a 360° circular pattern, covering the welds around the entire circumference of the pipe at one time. A single exposure can inspect the entire weld, resulting in high efficiency.

[0004] X-ray inspection of pipe butt joint circumferential seam defects usually uses a special climbing vehicle to transport a portable circumferential machine to the circumferential seam location for imaging. When encountering a small-diameter, thick-walled pipe, a circumferential machine with the X-ray penetration power to penetrate the wall is too large to enter the pipe for operation. However, a directional machine with the same X-ray penetration power is smaller and can enter the pipe for operation.

[0005] In pipeline radiographic inspection, the penetration capabilities of directional and circumferential radiographic machines depend primarily on the equipment's energy and beam focusing method. Circumferential radiographic machines are limited to 360° radiation and typically have lower energy (≤320kV), making them suitable for medium-thick (≤30mm) pipes. In these cases, directional radiographic machines of the same power can serve as an alternative. When inspecting pipes with wall thicknesses greater than 30mm outdoors, directional radiographic machines must be used to penetrate the pipe and detect defects. However, directional radiographic machines can only inspect a limited area of ​​the pipe at a time, requiring frequent manual adjustments and multiple inspections to complete the inspection of the entire circumferential weld. This cumbersome and time-consuming process significantly impacts pipeline inspection efficiency. Summary of the Invention

[0006] The present invention discloses a flaw detection device for pipeline inspection and a method of use, which solves the problem that the inspection of the pipeline circumferential weld must be completed by repeatedly moving an orienting machine in and out of the pipeline, adjusting the angle of the orienting machine, and performing multiple defect inspections on the pipeline, thereby reducing the efficiency of pipeline inspection.

[0007] In order to solve the above technical problems, the present invention specifically adopts the following technical solutions:

[0008] A flaw detection device for pipeline inspection includes a moving assembly, which includes a cylinder with a roller. A rotatable connecting cylinder is provided in the cylinder, and an orienting machine is detachably connected to the connecting cylinder. The ray emitting part of the orienting machine is located outside the cylinder and the connecting cylinder. A No. 1 motor for driving the connecting cylinder to rotate is fixed on the cylinder.

[0009] Furthermore, a connecting ring is provided in the connecting tube, and a fixing ring is fixed to the end of the direction-directing machine away from the ray-emitting part by a bolt, a screw is threadedly connected to the fixing ring, and a screw hole adapted to the screw is provided on the connecting ring; a No. 1 electric telescopic rod for driving the connecting ring to move toward the outside of the connecting tube is fixed in the connecting tube, and a battery is fixed in the connecting tube; a driving gear is fixed on the rotating shaft of the No. 1 motor, and a connecting tube passing through the cylinder is fixed at the axis center of the connecting tube, and a driven gear meshing with the driving gear is fixed on the connecting tube.

[0010] Furthermore, a group of No. 2 electric telescopic rods distributed in a circular array are fixed on the cylinder, and an arc-shaped plate is fixed to the telescopic end of the No. 2 electric telescopic rod, and a sensor is fixed on the arc-shaped plate; a connecting seat is fixed on the side of the arc-shaped plate away from the cylinder, and the roller is rotatably connected in the connecting seat, and a No. 2 motor for driving the roller is fixed on the connecting seat.

[0011] Furthermore, a fixing rod is fixed at one end of the open part of the connecting tube, and a support plate is provided at the end of the connecting tube close to the fixing rod, a connecting block is fixed on the support plate, a through hole is provided on the connecting block for the fixing rod to pass through, and the connecting block is fixed to the fixing rod by bolts; the end of the orienting machine located outside the connecting tube is in contact with the support plate, and a bearing bar in contact with the bottom of the orienting machine is fixed on the support plate.

[0012] Furthermore, a fan fixedly connected to the connecting cylinder passes through the connecting cylinder, and a through hole is opened on the cylinder; a fixing ring rotatably connected to the connecting cylinder is fixed inside the cylinder.

[0013] Furthermore, a lighting lamp and a camera are fixed on the abutment plate.

[0014] Furthermore, a connecting ring is fixed to the cylinder by screws, and an annular groove is provided on one side of the connecting ring facing the open part of the cylinder, a rubber strip in contact with each other end to end is inserted into the groove, and a connecting column passing through the connecting ring is fixed on one side of the rubber strip located in the groove, and a nut in contact with the outer wall of the connecting ring is threadedly connected to the connecting column; a connecting rod is threadedly connected to the fixing rod, and a connecting strip is fixed to the end of the connecting rod away from the fixing rod by a bolt, and a marker pen in contact with the rubber strip is fixed on the connecting strip.

[0015] Furthermore, a bearing plate is fixed in the connecting tube, the connecting ring is slidably connected to the bearing plate, a No. 3 electric telescopic rod is fixed in the connecting tube, and a bearing block that passes through the bearing plate is fixed to the telescopic end of the No. 3 electric telescopic rod.

[0016] Furthermore, the mobile assembly includes a crawling vehicle that can crawl in the pipeline, a No. 4 electric telescopic rod is fixed on the crawling vehicle, and a lifting plate fixed to the telescopic end of the No. 4 electric telescopic rod is provided above the crawling vehicle. Two rotatably connected driving rollers are passed through the lifting plate, and the two driving rollers are symmetrically distributed front to back. A No. 3 motor for driving one driving roller to rotate is fixed on the lifting plate, and the orienting machine is placed between the two driving rollers; an auxiliary roller in contact with the top of the orienting machine is provided above the lifting plate, and a fixed plate rotatably connected to the auxiliary roller is fixed on the lifting plate by bolts.

[0017] A method for using a flaw detection device for pipeline inspection comprises the following steps:

[0018] S1. Install the orienting machine in the connecting cylinder and make the cylinder enter the pipe to be tested;

[0019] S2. The roller drives the cylinder to move in the pipeline, so that the orienting machine moves to the designated position, and the ray emitting part of the orienting machine corresponds to the inspected part of the pipeline;

[0020] S3. Fix the film on the side of the pipe outer wall opposite to the radiation source of the directional machine, ensuring that the radiation penetrates the weld and is projected onto the film;

[0021] S4. By starting the No. 1 motor, the connecting tube drives the orientation machine to rotate to adjust the position of the ray emitting part of the orientation machine. The continuous rotation of the orientation machine completes the comprehensive inspection of the circumferential weld of the pipeline.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] After the orienting machine is installed in the connecting cylinder, the cylinder is placed in the pipeline and moved in the pipeline by the roller. When the orienting machine moves to the specified position, the ray emitting part of the orienting machine is aligned with the weld of the pipeline, and then the film is installed at the corresponding position on the outer wall of the pipeline; then the orienting machine is started to start inspecting the pipeline, and at the same time, the No. 1 motor is started to drive the connecting cylinder to rotate slowly, so that as the orienting machine rotates, the ray emitting part of the orienting machine irradiates the weld of the pipeline. The ray source emitted by the ray emitting part of the orienting machine can cover the entire circumferential weld of the pipeline in turn, completing the inspection of the circumferential weld of the pipeline; the present invention does not need to make the orienting machine repeatedly enter and exit the pipeline and adjust the angle of the orienting machine to perform all-round inspection of the circumferential weld of the pipeline. The inspection of the circumferential weld of the pipeline can be completed by rotating the orienting machine in the pipeline, thereby improving the inspection efficiency of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the front cross-section of the first embodiment of the moving assembly of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the cylinder side view of the present invention;

[0026] Figure 3 for Figure 1 A schematic diagram of the enlarged structure at point A;

[0027] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at point B;

[0028] Figure 5 This is a structural diagram showing the second embodiment of the mobile assembly of the present invention.

[0029] In the figure: 1. Cylinder; 11. Motor No. 1; 12. Fixing ring; 2. Connecting cylinder; 21. Connecting ring; 22. Electric telescopic rod No. 1; 23. Fan; 24. Battery; 25. Fixing rod; 26. Loading plate; 27. Connecting pipe; 3. Orienting machine; 31. Fixing ring; 311. Screw; 4. Curved plate; 41. Connecting seat; 411. Roller; 412. Motor No. 2; 42. Sensor; 5. Electric telescopic rod No. 2; 6. No. 3 Electric telescopic rod; 61, load-bearing block; 7, abutment plate; 71, connecting block; 72, lighting lamp; 73, camera; 74, load-bearing bar; 8, connecting ring; 81, rubber strip; 811, connecting column; 9, connecting rod; 91, connecting strip; 911, marking pen; 10, crawler; 101, No. 4 electric telescopic rod; 102, lifting plate; 1021, driving roller; 1022, No. 3 motor; 1023, auxiliary roller; 1024, fixing plate. DETAILED DESCRIPTION

[0030] The specific contents of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 、 Figure 2 and Figure 4 As shown, the present invention provides a flaw detection device for pipeline inspection, including a moving assembly, which includes a cylinder 1, on which a roller 411 is provided; a rotatable connecting cylinder 2 is provided in the cylinder 1, and an orienting machine 3 is detachably connected to the connecting cylinder 2, wherein the ray emitting part of the orienting machine 3 is located outside the cylinder 1 and the connecting cylinder 2, and a No. 1 motor 11 for driving the connecting cylinder 2 to rotate is fixed on the cylinder 1.

[0032] First embodiment: The first method of pipeline inspection by the orienting machine 3: After the orienting machine 3 is installed in the connecting cylinder 2, the cylinder 1 is placed in the pipeline, and the cylinder 1 is moved in the pipeline by the roller 411. After the orienting machine 3 moves to the specified position, its ray emitting part is aligned with the pipeline weld, and then the film is installed at the corresponding position of the outer wall of the pipeline; then the orienting machine 3 is started to start the pipeline inspection, and at the same time, the No. 1 motor 11 is started to drive the connecting cylinder 2 to rotate slowly. Since the orienting machine 3 is turned on for a long time, its own temperature will increase, and it must be stopped to cool down after a certain period of time. Therefore, the orienting machine 3 is used in a way of starting the orienting machine 3 for three minutes and then turning it off for three minutes; when the ray emitting part of the orienting machine 3 starts to inspect the pipeline weld from the top of the pipeline, During the inspection, the X-rays of the orienting machine 3 are irradiated to the pipe weld in a directional cone beam. The orienting machine 3 rotates clockwise so that the orienting machine 3 rotates along with it. Taking the dial as an example, in the initial position, when the initial coverage area of ​​the X-rays of the orienting machine 3 is within the scale range of 12 to 1 o'clock (including 12 and 1 o'clock), it takes three minutes for the orienting machine 3 to rotate clockwise until the X-rays of the orienting machine 3 completely cover the range of 1 to 2 o'clock. Therefore, the area within the range of 1 o'clock is fully irradiated for three minutes, while the area within the range of 12 o'clock to 1 o'clock (excluding 1 o'clock) is not fully irradiated for three minutes. Therefore, in each test, the X-ray emitting part of the orienting machine 3 needs to return to the initial position to complete the uniform irradiation inspection of all parts of the pipe circumferential weld.

[0033] like Figure 1As shown, a connecting ring 21 is provided in the connecting tube 2, and a fixing ring 31 is fixed to the end of the orienting machine 3 away from the ray emitting part by a bolt. A screw 311 is threadedly connected to the fixing ring 31, and a screw hole adapted to the screw 311 is provided on the connecting ring 21; a No. 1 electric telescopic rod 22 for driving the connecting ring 21 to move toward the outside of the connecting tube 2 is fixed in the connecting tube 2, and a battery 24 is fixed in the connecting tube 2; a driving gear is fixed on the rotating shaft of the No. 1 motor 11, and a connecting tube 27 that passes through the cylinder 1 is fixed at the axis center of the connecting tube 2, and a driven gear meshing with the driving gear is fixed on the connecting tube 27. By starting the No. 1 electric telescopic rod 22, the connecting ring 21 can be driven to move outward, and then the fixing ring 31 of the orienting machine 3 is tightly fixed to the connecting ring 21 by the screw 311, and the No. 1 electric telescopic rod 22 is started again, so that the connecting ring 21 drives the fixing ring 31 to move inward, thereby successfully completing the installation of the orienting machine 3 in the connecting tube 2; the fixed end of the No. 1 electric telescopic rod 22 is fixed to the inner wall of the connecting tube 2, and the telescopic end of the No. 1 electric telescopic rod 22 is fixed to the connecting ring 21, and the battery 24 can supply power to the No. 1 electric telescopic rod 22. After starting the No. 1 motor 11 The rotating shaft of motor No. 11 can drive the driven gear to rotate through the driving gear, so that the connecting tube 27 drives the connecting tube 2 to rotate, and the cable connected to the orienting machine 3 can be connected to the orienting machine 3 through the inner side of the connecting tube 27. The cable is long. When the orienting machine 3 rotates, the cable does not affect the orienting machine 3 to rotate one circle. The cable can support the orienting machine 3 to rotate 540°, which fully meets the rotation requirements of the orienting machine 3; the operation program of motor No. 11 is controlled by an external control system to ensure that the rotation speed and requirements of the orienting machine 3 meet the detection requirements of the pipeline.

[0034] like Figure 2 and Figure 4 As shown, the cylinder 1 is fixed with a set of second electric telescopic rods 5 distributed in a circular array. The telescopic end of the second electric telescopic rod 5 is fixed with an arc plate 4, and the arc plate 4 is fixed with a sensor 42. The side of the arc plate 4 away from the cylinder 1 is fixed with a connecting seat 41, and a roller 411 is rotatably connected in the connecting seat 41. The connecting seat 41 is fixed with a second motor 412 for driving the roller 411. There are two sets of arc plates 4 on the cylinder 1, and the two sets of arc plates 4 are symmetrically distributed (with Figure 1 ), two connecting seats 41 are provided on an arc-shaped plate 4, and a main controller (such as a PLC, STM32, Raspberry Pi, or ESP32) is responsible for calculating motion instructions and sending them to each servo driver. The servo driver receives the instructions and drives the second motor 412 (the second motor 412 uses a servo motor) to ensure that multiple second motors 412 operate synchronously, thereby driving the roller 411 to rotate synchronously, thereby driving the cylinder 1 to move smoothly into the pipe;

[0035] The second way of pipeline inspection by the orienting machine 3: the film can be fixed on the outer wall of the pipeline, corresponding to the weld on the pipeline, and the ray emitting part of the orienting machine 3 is aligned with the pipeline weld to start the inspection. After completing a part of the weld inspection, the No. 1 motor 11 drives the connecting tube 2 to rotate, driving the orienting machine 3 to rotate so that its ray emitting part is aligned with the next part adjacent to the weld, and then the weld part on the pipeline can be continued to be inspected; subsequently, by rotating the orienting machine 3, a full-scale inspection of the circumferential weld of the pipeline can be completed; the telescopic end of the No. 2 electric telescopic rod 5 is fixed with a fixed block, which is connected to the arc plate 4 by bolts. The No. 2 electric telescopic rod can be started according to the inner diameter of the pipeline. After moving the telescopic rod 5, the telescopic end of the No. 2 electric telescopic rod 5 drives the arc plate 4 away from or close to the cylinder 1, so that the roller 411 can contact the inner wall of the pipe with different inner diameters; it is also possible to separate the telescopic end of the No. 2 electric telescopic rod 5 from the arc plate 4 and replace it with a different arc plate 4 so that the roller 411 on the arc plate 4 can better contact the inner wall of the pipe; a group of No. 2 electric telescopic rods 5 are also started by controlling the controller so that the telescopic ends of a group of No. 2 electric telescopic rods 5 can be synchronously extended and retracted; magnets or RFID tags are arranged outside the pipe, and the internal equipment detects the mark point through the sensor 42 to determine that the orienting machine 3 has moved to the specified position.

[0036] like Figure 1 As shown, a fixing rod 25 is fixed to one end of the open portion of the connecting tube 2. A stop plate 7 is provided at the end of the connecting tube 2 near the fixing rod 25. A connecting block 71 is fixed to the stop plate 7. The connecting block 71 has a through hole for the fixing rod 25 to pass through. The connecting block 71 is fixed to the fixing rod 25 by bolts. The end of the orienting machine 3 located outside the connecting tube 2 contacts the stop plate 7. A supporting bar 74 is fixed to the stop plate 7, which contacts the bottom of the orienting machine 3. There are at least two fixing rods 25, and there are two corresponding connecting blocks 71. After the two fixing rods 25 are passed through the through holes of the two connecting blocks 71, the connecting blocks 71 and the fixing rods 25 are fixed together using bolts, so that the stop plate 7 contacts one end of the orienting machine 3 and the bottom of the orienting machine 3 contacts the top of the supporting bar 74, thereby increasing the stability of the orienting machine 3.

[0037] like Figure 1 and Figure 2As shown, a fan 23 is fixedly connected to the connecting tube 2, and a perforation is provided in the cylinder 1. A fixing ring 12 is fixed inside the cylinder 1, which is rotatably connected to the connecting tube 2. A battery 24 powers the fan 23. When activated, the air blown by the fan 23 directly acts on the orienteering machine 3, cooling it and preventing it from overheating. The cooling effect of the fan 23 is determined according to actual conditions. In some dusty environments or when air cooling is not supported, the fan 23 is not activated. There are two fixing rings 12, which are rotatably connected to the connecting tube 2 via bearings, which can increase the stability of the connecting tube 2.

[0038] like Figure 1 As shown, a lighting lamp 72 and a camera 73 are fixed on the abutment plate 7. The lighting lamp 72 and the camera 73 are powered by the battery 24. The lighting lamp 72 can illuminate the inside of the pipeline, and the camera 73 can transmit real-time images to an external display screen for viewing by staff.

[0039] like Figure 1 and Figure 3 As shown, a connecting ring 8 is fixed to the cylinder 1 by screws. The side of the connecting ring 8 facing the open part of the cylinder 1 is provided with an annular groove, into which a rubber strip 81 is inserted, with its end-to-end contact. A connecting column 811 is fixed to the side of the rubber strip 81 located in the groove, which passes through the connecting ring 8. A nut is threadedly connected to the connecting column 811 and contacts the outer wall of the connecting ring 8. The fixing rod 25 is threadedly connected to the connecting rod 9. The other end of the connecting rod 9 is fixed to the connecting strip 91 with a bolt. A marking pen 911 is mounted on the connecting strip 91 and contacts the rubber strip 81. The outer ring surface of the connecting ring 8 contacts the inner wall of the pipe. After the rubber strip 81 is inserted into the groove of the connecting ring 8, the end-to-end contact of the rubber strip 81 is formed into a circular ring. At the same time, after the connecting column 811 passes through the connecting ring 8, the nut is threadedly connected to the connecting column 811 to fix the rubber strip 81. There are three connecting columns 811, which are respectively located at the head, tail and middle part of the rubber strip 81; only one fixing rod 25 is threadedly connected to the connecting rod 9. The connecting strip 91 is fixed to the connecting rod 9 by bolts to ensure that the marker pen 911 is in contact with the head of the rubber strip 81) When the connecting tube 2 drives the orienting machine 3 to rotate to detect the pipeline, the marker pen 911 can leave a mark on the rubber strip 81 after rotating; since the ray emitting part of the orienting machine 3 is on its own back (with Figure 1, and the coverage area of ​​the transmitting part is larger than the marking pen 911. Therefore, when the orientation machine 3 rotates and performs a full range of inspection on the circumferential weld on the pipeline, the mark made by the marking pen 911 on the rubber strip 81 is not a full circle, and there is a gap. After the subsequent staff removes the rubber strip 81, they put the rubber strip 81 into a straight line, and then measure the distance between the end point of the mark made by the marking pen 911 on the rubber strip 81 and the tail of the rubber strip 81. It can be inferred whether the orientation machine 3 has performed a full range of inspection on the circumferential weld on the pipeline and whether there are any undetected missed parts or overlapping parts in the weld on the pipeline; the connecting ring 8 is fixed to the cylinder 1 by screws (the screws are not shown in the figure) and can be disassembled for pipelines with different inner diameters. Connect the ring 8 and replace it with the appropriate model, adjust the height of the connecting rod 9, and fix the connecting strip 91 on the top of the rod; and after the cylinder 1 enters the pipeline, the cylinder 1 drives the connecting ring 8 to the detection part and continues to move forward to clean the impurities on the inner wall of the pipeline to ensure that there are no attachments at the detection part that affect the detection results. When the impurities are cleaned, the cylinder 1 is retreated to make the ray emitting part of the orientation machine 3 correspond to the detection part of the pipeline; the No. 1 motor 11 uses a servo motor, which rotates in steps at a fixed angle (such as 1°~5°), and stops for exposure at each step to ensure that there are no omissions; pulse control, through the PLC or motion controller to send pulse signals to accurately control the rotation step; the setting of the marker pen 911 is mainly used when the orientation machine 3 detects the pipeline in the second way.

[0040] like Figure 1 As shown, a bearing plate 26 is fixed within the connecting tube 2, and a connecting ring 21 is slidably connected to the bearing plate 26. A third electric telescopic rod 6 is fixed within the connecting tube 2, and a bearing block 61 is fixed to the telescopic end of the third electric telescopic rod 6, which passes through the bearing plate 26. There are two bearing plates 26, and the connecting ring 21 is located between the two bearing plates 26. When the connecting ring 21 slides, it can increase the stability of the connecting ring 21 and reduce the pressure on the connecting ring 21 and the first electric telescopic rod 22. When the orienteering machine 3 is fixed to the connecting ring 21 and the connecting ring 21 drives the orienteering machine 3 to move into the connecting tube 2, the third electric telescopic rod 6 can be activated to drive the bearing block 61 to move. The third electric telescopic rod 6 is provided in two groups, and the two bearing blocks 61 can clamp and fix the orienteering machine 3, further increasing the stability of the orienteering machine 3. The first electric telescopic rod 22 and the third electric telescopic rod 6 are each powered by a battery 24.

[0041] like Figure 5As shown, the mobile assembly includes a crawling vehicle 10 that can crawl in the pipeline, and a No. 4 electric telescopic rod 101 is fixed on the crawling vehicle 10. A lifting plate 102 fixed to the telescopic end of the No. 4 electric telescopic rod 101 is provided above the crawling vehicle 10, and two rotatably connected driving rollers 1021 are passed through the lifting plate 102, and the two driving rollers 1021 are symmetrically distributed front to back. A No. 3 motor 1022 for driving one driving roller 1021 to rotate is fixed on the lifting plate 102, and the orienting machine 3 is placed between the two driving rollers 1021; an auxiliary roller 1023 in contact with the top of the orienting machine 3 is provided above the lifting plate 102, and a fixed plate 1024 rotatably connected to the auxiliary roller 1023 is fixed on the lifting plate 102 by bolts.

[0042] Second embodiment: After the orienting machine 3 is placed between two drive rollers 1021, a fixed plate 1024 is fixed to the lifting plate 102 by bolts. There are two fixed plates 1024, and an auxiliary roller 1023 is located between the two fixed plates 1024. At this time, the bottom of the auxiliary roller 1023 contacts the top of the orienting machine 3, which acts as a limit for the orienting machine 3. The crawler 10 in the pipeline is a very mature existing technology and is not described in detail here. The fourth electric telescopic rod 101 is activated to adjust the height of the lifting plate 102 to ensure that the orienting machine 3 is located at the axis of the pipeline. The crawler 10 then pulls the orienting machine 3 into the pipeline. When the orienting machine 3 moves to the specified position (a sensor 42 can also be installed on the fixed plate 1024), the third motor 1022 is activated to drive one drive roller 1021 to rotate. The orienting machine 3 then begins to rotate. The other drive roller 1021 and the auxiliary roller 1023 also begin to rotate, and the circumferential weld of the pipeline can be inspected.

[0043] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, a method for using a flaw detection device for pipeline inspection includes the following steps:

[0044] S1. Install the orienting machine 3 in the connecting cylinder 2 and make the cylinder 1 enter the pipeline to be inspected;

[0045] S2, the roller drives the cylinder 1 to move in the pipeline, so that the orienting machine 3 moves to the specified position, and the ray emitting part of the orienting machine 3 corresponds to the inspected part of the pipeline;

[0046] S3. The film is fixed on the side of the pipe outer wall opposite to the radiation source of the directional machine 3, ensuring that the radiation penetrates the weld and is projected onto the film;

[0047] S4. By starting the No. 1 motor 11, the connecting tube 2 drives the orienting machine 3 to rotate, which can change the position of the ray emitting part of the orienting machine 3. Through the rotation of the orienting machine 3, the detection operation of the circumferential weld of the pipeline is completed.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A flaw detection device for pipeline inspection, characterized in that: It includes a moving component, which includes a cylinder with a roller on it; a rotatable connecting cylinder is provided inside the cylinder, and a direction-directing machine is detachably connected inside the connecting cylinder. The ray-emitting part of the direction-directing machine is located outside the cylinder and the connecting cylinder, and a No. 1 motor for driving the connecting cylinder to rotate is fixed on the cylinder.

2. A pipeline flaw detection device according to claim 1, characterized in that: A connecting ring is provided in the connecting tube, and a fixing ring is fixed to the end of the direction-directing machine away from the ray-emitting part by a bolt. A screw is threadedly connected to the fixing ring, and a screw hole adapted to the screw is provided on the connecting ring; a No. 1 electric telescopic rod for driving the connecting ring to move toward the outside of the connecting tube is fixed in the connecting tube, and a battery is fixed in the connecting tube; a driving gear is fixed on the rotating shaft of the No. 1 motor, and a connecting tube passing through the cylinder is fixed at the axis center of the connecting tube, and a driven gear meshing with the driving gear is fixed on the connecting tube.

3. The pipeline flaw detection device according to claim 1, characterized in that: A group of No. 2 electric telescopic rods distributed in a circular array are fixed on the cylinder, and an arc plate is fixed to the telescopic end of the No. 2 electric telescopic rod, and a sensor is fixed on the arc plate; a connecting seat is fixed on the side of the arc plate away from the cylinder, and the roller is rotatably connected in the connecting seat, and a No. 2 motor for driving the roller is fixed on the connecting seat.

4. The pipeline flaw detection device according to claim 1, characterized in that: A fixing rod is fixed at one end of the open part of the connecting tube, and a butt plate is provided at the end of the connecting tube close to the fixing rod. A connecting block is fixed on the butt plate. A through hole is provided on the connecting block for the fixing rod to pass through. The connecting block is fixed to the fixing rod by bolts; one end of the orienteering machine located outside the connecting tube is in contact with the butt plate, and a bearing bar in contact with the bottom of the orienteering machine is fixed on the butt plate.

5. The pipeline flaw detection device according to claim 1, characterized in that: A fan is fixedly connected to the connecting cylinder and a through hole is provided on the cylinder. A fixing ring rotatably connected to the connecting cylinder is fixed in the cylinder.

6. The pipeline flaw detection device according to claim 4, characterized in that: A lighting lamp and a camera are fixed on the abutment plate.

7. The pipeline flaw detection device according to claim 4, characterized in that: A connecting ring is fixed to the cylinder by screws, and an annular groove is provided on the side of the connecting ring facing the open part of the cylinder, and a rubber strip in contact with each other at the end is inserted into the groove, and a connecting column passing through the connecting ring is fixed on the side of the rubber strip located in the groove, and a nut in contact with the outer wall of the connecting ring is threadedly connected to the connecting column; a connecting rod is threadedly connected to the fixing rod, and a connecting strip is fixed to the end of the connecting rod away from the fixing rod by a bolt, and a marker pen in contact with the rubber strip is fixed on the connecting strip.

8. The pipeline flaw detection device according to claim 1, characterized in that: A bearing plate is fixed in the connecting tube, the connecting ring is slidably connected to the bearing plate, a No. 3 electric telescopic rod is fixed in the connecting tube, and a bearing block that penetrates the bearing plate is fixed to the telescopic end of the No. 3 electric telescopic rod.

9. The pipeline flaw detection device according to claim 1, characterized in that: The mobile assembly includes a crawling vehicle that can crawl in the pipeline, a No. 4 electric telescopic rod is fixed on the crawling vehicle, a lifting plate fixed to the telescopic end of the No. 4 electric telescopic rod is provided above the crawling vehicle, two rotatably connected driving rollers are passed through the lifting plate, and the two driving rollers are symmetrically distributed front to back, a No. 3 motor for driving one driving roller to rotate is fixed on the lifting plate, and the orienting machine is placed between the two driving rollers; an auxiliary roller in contact with the top of the orienting machine is provided above the lifting plate, and a fixed plate rotatably connected to the auxiliary roller is fixed on the lifting plate by bolts.

10. A method for using the pipeline flaw detection device according to claim 1, characterized in that: The steps include: S1. Install the orienting machine in the connecting cylinder and make the cylinder enter the pipe to be tested; S2. The roller drives the cylinder to move in the pipeline, so that the orienting machine moves to the designated position, and the ray emitting part of the orienting machine corresponds to the inspected part of the pipeline; S3. Fix the film on the side of the pipe outer wall opposite to the radiation source of the directional machine, ensuring that the radiation penetrates the weld and is projected onto the film; S4. By starting the No. 1 motor, the connecting tube drives the orientation machine to rotate to adjust the position of the ray emitting part of the orientation machine. The continuous rotation of the orientation machine completes the comprehensive inspection of the circumferential weld of the pipeline.

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