Ultrasonic detection device for large pipe diameter

Abstract

The invention relates to the technical field of engineering detection, in particular to a large-pipe-diameter ultrasonic detection device which comprises a to-be-detected pipeline, a plurality of steel belts are evenly arranged on the outer side of the pipeline, hanging rings are fixedly arranged on the two sides of each steel belt, a first connecting belt is arranged between every two steel belts, and hooks are arranged at the two ends of each first connecting belt. A detection device is further arranged at the upper end of the pipeline, an elastic hanging rope is arranged in the detection device in a penetrating mode, hooks are arranged at the two ends of the elastic hanging rope, and the hooks of the elastic hanging rope hook the hanging rings on the side face of any steel belt. By arranging the steel belt, the connecting belt, the rubber block and the elastic hanging rope, the device can be suitable for different pipe diameters, and by arranging the positioning protection ring and the connecting belt, the interior of the positioning protection ring is filled with a coupling agent, and the ultrasonic transmission efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of engineering detection, and in particular to an ultrasonic detection device for large-diameter pipes. Background Art

[0002] Ultrasonic metal detectors are usually used for metal pipe inspection in engineering inspection. Ultrasonic metal detectors use the propagation characteristics of ultrasonic waves in different media for detection and imaging. The probe contains one or more transmitting elements and receiving elements. The transmitting element converts electrical energy into mechanical vibrations to generate ultrasonic pulses, which are generated in the piezoelectric film or quartz wafer in the probe and propagate into the object being inspected through the coupling agent of the probe. When ultrasonic waves encounter the boundaries of different media, such as the boundaries between tissues or organs, the sound waves will be reflected, refracted and scattered, and part of the ultrasonic waves will return to the receiving element on the probe. The receiving element converts the ultrasonic waves into electrical signals, and through amplification and filtering, it is finally transmitted to the ultrasonic equipment for processing and display.

[0003] Ultrasonic metal detectors are generally used to detect the thickness, cracks, slag inclusions, pores, etc. of metal pipes. Before installation, it is necessary to understand the parameters of the pipe in detail, including pipe material, pipe wall thickness, pipe diameter, fluid type, fluid temperature, etc. This information is crucial for selecting the installation location.

[0004] Things to note when choosing the installation location: 1. Avoid interference sources. Strong magnetic fields and vibration interference sources such as water pumps, high-power radio stations, and frequency converters should be avoided to ensure the stability and accuracy of the ultrasonic signal. 2. Ensure sufficient straight pipe sections. The straight pipe section upstream of the installation point should be greater than 10D (D is the pipe diameter), and the downstream should be greater than 5D to ensure the stability of the fluid flow and reduce the impact of eddy currents and turbulence on the measurement accuracy. 3. Avoid bubbles and precipitation. On horizontal pipes, the probe should generally be installed in the middle of the pipe to avoid bubbles that may be contained at the top and precipitation that may exist at the bottom.

[0005] In summary, ultrasonic metal detectors are limited by the installation environment. Currently, ultrasonic metal detectors are generally installed by vertically clamping them on the pipe through independent clamps, which cannot meet the clamping needs of pipes with different diameters. In actual working conditions, ultrasonic metal detectors often need to be installed tilted relative to the pipe, based on the requirements of avoiding bubbles that may be contained in the top of the pipe and sediment that may exist at the bottom during the upward installation, as well as the reality of obstacles near the installation point.

[0006] Therefore, the installation fixture of the ultrasonic metal detector needs to be adjusted according to the diameter of the pipe to ensure that it can be stably clamped on the pipe at any installation angle. Summary of the invention

[0007] According to the problems raised in the background technology, the present invention provides an ultrasonic detection device for large-diameter pipes to solve the problems. The present invention will be further explained below.

[0008] An ultrasonic detection device for a large pipe diameter comprises a pipe to be detected, a plurality of steel belts are evenly arranged on the outside of the pipe, hanging rings are fixedly arranged on both sides of the steel belts, a first connecting belt is arranged between the two steel belts, hooks are arranged at both ends of the first connecting belt, a detection device is also arranged at the upper end of the pipe, an elastic hanging rope is passed through the detection device, hooks are arranged at both ends of the elastic hanging rope, and the hooks of the elastic hanging rope hook the hanging rings on the sides of any of the steel belts; Preferably, the detection device comprises an installation box, and support rods are provided at the four corners of the bottom of the installation box; the support rods are against the outer wall of the pipeline, and a cylinder is fixedly provided at the upper end of the installation box through a fixing frame, and the output end of the cylinder passes through the upper end of the installation box and is gap-matched with the upper end of the installation box; a sleeve is fixedly connected to the output end of the cylinder, and the two ends of the sleeve are fixedly connected to the elastic hanging rope; an ultrasonic detector is built in the installation box, and the probe of the ultrasonic detector extends to the outside of the bottom of the installation box, facing the pipeline; Preferably, the steel belt is provided with a rubber block on at least one side facing the pipe wall, and the rubber block is provided with a plurality of anti-slip convex points on the side contacting the pipe wall; Preferably, first guide wheels are provided on both sides of the installation box through support frames; Preferably, two L-shaped support plates are provided on both sides of the upper end of the sleeve, and mounting plates are also provided on both sides of the upper end of the sleeve, and a slide groove is provided on the inner side of the mounting plate, and the long end of the L-shaped support plate is slidably connected to the slide groove; the length of the long end of the L-shaped support plate is greater than the sum of the diameters of the two elastic hanging ropes; Preferably, second guide wheels are provided at the bottom of the mounting plates on both sides; Preferably, circular mounting cylinders are provided on both sides of the installation box, supporting ears are provided on both sides of the circular mounting cylinder, and the circular mounting cylinder is fixed to the bottom of the installation box by bolts, a spring is provided inside the circular mounting cylinder, the support rod passes through the bottom of the installation box and is clearance-matched with the bottom of the installation box, a stop plate is provided on the upper end of the support rod, the stop plate is inside the circular mounting cylinder and is slidably connected inside the circular mounting cylinder; one end of the spring abuts against the upper end of the circular mounting cylinder, and the other end abuts against the stop plate; Preferably, a positioning protection ring is provided below the probe, the positioning protection ring is connected to the support rods via a second connecting belt, and the positioning protection ring is located directly below the probe; the second connecting belt is elastic, and the positioning protection ring is connected by the second connecting belt so that its position is located at the center of the rectangle formed by the four support rods; Preferably, a rotatable roller is provided at the lower end of the support rod; Beneficial effects: Compared with the prior art, the present invention can make the device suitable for different pipe diameters by providing steel belts and connecting belts, rubber blocks and elastic hanging ropes, and by providing positioning protection rings and connecting belts and filling coupling agent inside the positioning protection rings, the ultrasonic transmission efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 : Schematic diagram of the structure of the present invention; Figure 2 : An enlarged schematic diagram of the structure at B of the present invention; Figure 3 : An enlarged schematic diagram of the cross-sectional structure at A of the present invention; Figure 4 : An enlarged schematic diagram of the structure at position C of the present invention; Figure 5 : An enlarged top view of the material storage frame of the present invention; In the figure: pipeline 1, steel belt 2, hanging ring 3, first connecting belt 4, detection device 5, elastic hanging rope 6, rubber block 7, installation box 501, cylinder 502, sleeve 503, ultrasonic detector 504, probe 505, first guide wheel 506, support rod 507, circular installation cylinder 508, support ear 509, spring 510, stop plate 511, positioning protection ring 512, second connecting belt 513, installation plate 514, second guide wheel 515, L-shaped support plate 516; DETAILED DESCRIPTION

[0010] Next, combine with Figure 1-5 A specific embodiment of the present invention is described in detail.

[0011] An ultrasonic testing device for large diameter pipes, as shown in the attached Figure 1-2 As shown, it includes a pipeline 1 to be inspected (hereinafter referred to as "pipeline"), and multiple steel belts 2 are evenly arranged on the outside of the pipeline 1. Hanging rings 3 are fixed on both sides of the steel belts 2. A first connecting belt 4 is arranged between the two steel belts 2. Hooks are arranged at both ends of the first connecting belt 4, that is, the hooks at both ends of the first connecting belt 4 are hung inside the hanging rings 3, so that the steel belt 2 can be wrapped and fixed on the outside of the pipeline 1. A detection device 5 is also arranged at the upper end of the pipeline 1. An elastic hanging rope 6 is penetrated in the detection device 5. Hooks are arranged at both ends of the elastic hanging rope 6. The hooks of the elastic hanging rope 6 hook the hanging ring 3 on the side of any steel belt 2. At this time, the number of steel belts 2 wrapped around the pipeline is selected according to the pipe diameter.

[0012] The detection device 5 is used to emit ultrasonic waves to detect the thickness, cracks, slag inclusions, pores, etc. of the pipeline. It should be noted that the number of the steel strips 2 and the first connecting strips 4 is sufficient, that is, for pipelines of any diameter, an appropriate number of steel strips and connecting strips can be selected. In the present invention, by providing the first connecting strip 4 between multiple steel strips 2 that do not have tensile elasticity, the length of a single steel strip 2 and the first connecting strip 4 can be as short as possible, thereby making it fit as closely as possible to the pipeline.

[0013] As attached Figure 2 As shown, the steel belt 2 is provided with a rubber block 7 on at least one side facing the pipe wall. After the steel belt 2 is wrapped around the pipe and under the action of the contraction elastic force of the elastic hanging rope 6, the rubber block 7 is tightly attached to the outer wall of the pipe. The extrusion of the rubber block 7 and the pipe wall forms a great friction force between the rubber block and the outer wall of the pipe. Preferably, the rubber block 7 is provided with a plurality of anti-slip protrusions on the side contacting the pipe wall, that is, the contact surface between the rubber block 7 and the pipe wall is a rough surface, in order to enhance the direct friction between the rubber block 7 and the pipe wall, so that the detection device can be installed more firmly.

[0014] As attached Figure 3 As shown, the detection device 5 includes an installation box 501, and support rods 507 are provided at the four corners of the bottom of the installation box 501; the support rods 507 are against the outer wall of the pipeline 1, and a cylinder 502 is fixedly provided at the upper end of the installation box 501 through a fixing frame, and the output end of the cylinder 502 passes through the upper end of the installation box 501 and is in clearance fit with the upper end of the installation box 501; a sleeve 503 is fixedly connected to the output end of the cylinder 502, and the two ends of the sleeve 503 are fixedly connected to the elastic hanging rope 6, that is, the elastic hanging rope 6 inside the installation box 501 is divided into two ends, which are respectively fixedly connected to the two ends of the sleeve 503; further, first guide wheels 506 are provided on both sides of the installation box 501 through support frames, and the setting of the first guide wheel 506 can make the elastic hanging rope 6 smoother when stretched or loosened; Through the above arrangement, it is ensured that the elastic hanging ropes 6 at both ends can be at the same level and the same height, and then the elastic hanging ropes 6 will not be caused to generate torque between the elastic hanging ropes 6 on both sides when they are rising, so that the installation box 501 cannot be placed vertically on the outside of the pipeline 1; That is, by starting the cylinder 502, the output end of the cylinder 502 is driven to rise, and then the sleeve 503 is driven to rise, pulling the steel belts 2 on both sides and causing the elastic hanging ropes 6 to deform. The tension generated by the symmetrical elastic hanging ropes 6 on both sides makes the support rod 507 contact the surface of the pipeline. At the same time, the elastic force generated makes the steel belt 2 and the rubber block 7 tightly wound around the pipeline. The friction force formed by the extrusion of the rubber block 7 and the pipeline wall overcomes the gravity of the entire device when it is installed tilted and stabilizes on the pipeline. However, in order to ensure that the sleeve 503 rises vertically and prevent the sleeve 503 from being on a different vertical plane from the output end of the cylinder 502 during the rising process, resulting in torque generated at the output end of the cylinder 502, which may cause the output end to break in severe cases, the applicant adopts the following solution, namely, two L-shaped support plates 516 are provided on both sides of the upper end of the sleeve 503, and mounting plates 514 are also provided on both sides of the upper end of the sleeve 503. The inner side of the mounting plate 514 is provided with a slide groove, and the long end of the L-shaped support plate 516 is slidably connected to the slide groove; through the above measures, the sleeve 503 can be vertically risen. Of course, it should be noted that since elastic hanging ropes 6 are fixedly provided at both ends of the sleeve 503, it is necessary to ensure that the elastic hanging rope 6 smoothly enters between the two mounting plates 514 during the rising process of the sleeve 503, that is, the length of the long end of the L-shaped support plate 516 is greater than the sum of the diameters of the two elastic hanging ropes 6; In this embodiment, second guide wheels 515 are further provided at the bottom of the mounting plates 514 on both sides. The provision of the second guide wheels 515 can make the elastic hanging rope 6 stretch or release more smoothly. The installation box 501 has an ultrasonic detector 504 built in, and a probe 505 of the ultrasonic detector 504 extends to the outside of the bottom of the installation box 501 and faces the pipeline; When there is air between the probe and the device being tested, it will affect the transmission of the ultrasonic signal, resulting in deviations in the test results. Therefore, it is necessary to apply enough coupling agent between the center of the probe and the pipe wall to eliminate interference factors such as air bubbles and gravel to ensure the smooth transmission of the ultrasonic signal. Before that, the rust and paint on the surface of the pipe need to be cleaned, and generally an angle grinder is used to polish it until it is bright, smooth and free of pits to ensure good contact between the probe and the pipe.

[0015] The coupling agent is usually a transparent or white viscous liquid with good wettability and sound permeability. Before applying the coupling agent, use a clean cloth or paper towel to wipe the front end of the probe and the surface of the pipe wall to remove impurities such as dirt, grease and oxides. This helps ensure that the coupling agent can be evenly attached between the probe and the pipe wall. Generally speaking, the coupling agent needs to cover the probe. The amount of coupling agent can be increased appropriately. Use your fingers, cotton swabs or special application tools (such as scrapers) to evenly apply the coupling agent on the radiating surface of the probe to ensure that the coupling agent is in full contact with the probe surface. At the same time, apply a thin layer of coupling agent on the surface of the pipe wall to fill the tiny gap between the probe and the pipe wall.

[0016] According to experience, the thickness of the coupling agent is about 1mm, and a protective layer is directly formed between the probe and the pipe wall to ensure that the ultrasonic signal can be stably and evenly transmitted to the inside of the pipe wall. However, in this embodiment, the ultrasonic detection device is suitable for pipes of different diameters. After the four support rods 507 contact the outer wall of the pipe, the distance between the exposed probe 506 of the ultrasonic detector 505 and the outer wall of the pipe needs to be adjustable. This embodiment is achieved by controlling the length of the exposed installation box 501 of the four support rods 507; As attached Figure 4 As shown, circular mounting tubes 508 are provided on both sides of the installation box 501, and ears 509 are provided on both sides of the circular mounting tube 508, and the circular mounting tube 508 is fixed to the bottom of the installation box 501 through bolts, and a spring 510 is provided inside the circular mounting tube 508, and the support rod 507 passes through the bottom of the installation box 501 and is in clearance fit with the bottom of the installation box 501, and a stop plate 511 is provided on the upper end of the support rod 507, and the stop plate 511 is inside the circular mounting tube 508 and is slidably connected inside the circular mounting tube 508; one end of the spring 510 abuts against the upper end of the circular mounting tube 508, and the other end abuts against the stop plate 511; As attached Figure 3 As shown, when installing the device, the cylinder rises and gradually tightens the elastic hanging rope 6. After the support rod 507 contacts the surface of the pipeline, the elastic force of the elastic hanging rope 6 links the support rod 507 to compress the spring 510, so that the probe 505 gradually approaches the outer wall of the pipeline. It should be noted that the probe of the ultrasonic detector is usually in contact with the outer wall of the pipeline to ensure that the ultrasonic wave can be effectively transmitted to the inside of the pipeline and detected. However, this contact is not achieved by applying significant pressure, but by ensuring good acoustic contact through appropriate coupling agents. The elastic force generated by the elastic hanging rope 6 is sufficient to overcome the gravity component when the overall device is tilted, which will also cause the probe 505 to generate an interaction force with the outer wall of the pipeline, causing damage to the probe 505, and will also squeeze the coupling agent coating between the probe and the pipe wall, making it impossible to maintain a coupling agent coating with a thickness of about 1 mm.

[0017] Based on this, as attached Figure 5 As shown, a positioning protection ring 512 is provided below the probe 505 , the positioning protection ring 512 is connected to the support rod 507 via a second connecting belt 513 , and the positioning protection ring 512 is located directly below the probe (the projection point of the probe on the outer wall of the pipeline).

[0018] The second connection belt 513 is elastic, and the positioning protection ring 512 is connected by the second connection belt 513 so that its position is in the center of the rectangle formed by the four support rods 507. It is intended that regardless of the diameter of the pipeline, when the probe 505 descends, it will gradually extend into the positioning protection ring 512. Since the positioning protection ring 512 itself has a certain thickness, when the ultrasonic detector 504 contacts the positioning protection ring 512, it is blocked and no longer moves downward. At this time, the probe 506 is built into the positioning protection ring 512 and does not directly contact the outer wall of the pipeline, so as to protect the probe.

[0019] By controlling the thickness of the positioning protection ring 512, the distance between the installed probe and the outer wall of the pipe can be about 1 mm. This 1 mm gap is used to form a coupling agent coating. In the process of applying the coupling agent, try to avoid the generation of bubbles, which will interfere with the transmission of the ultrasonic signal and reduce the accuracy of the measurement.

[0020] In this embodiment, the positioning protection ring 512 contacts the outer wall of the pipe, and a cavity is formed between the positioning protection ring 512 and the outer wall of the pipe. Based on this, when applying the coupling agent in this embodiment, a sufficient amount of coupling agent can be placed in this cavity. When the probe 505 is gradually built into the positioning protection ring 512, the coupling agent is squeezed downward, so that the air inside the coupling agent can be removed, thereby improving the accuracy of signal transmission.

[0021] The present invention is applicable to pipelines of different diameters. When selecting the detection point, the problems described in the background technology need to be considered. After the detection point is determined, local position adjustment needs to be performed continuously during the installation process. At this time, the contact point of the support rod 507 on the outer wall of the pipeline is constantly moving. Based on this, a rotatable roller is provided at the lower end of the support rod 507 to reduce the friction between the support rod 507 and the outer wall of the pipeline to avoid scratches.

[0022] When using this device, first select the installation location, clean the rust and paint on the pipe surface, and generally use an angle grinder to polish it until it is bright, smooth and without pits to ensure good contact between the probe and the pipe, then use a clean cloth or paper towel to wipe the front end of the probe and the pipe wall surface; fill the positioning protection ring with coupling agent; Select an appropriate amount of steel belt, connecting belt and rubber block, wrap them around the pipe to be tested through the hook and the first hanging ring in sequence, and then hook the hook of the elastic hanging rope to the hanging ring at the end of the steel belt; The cylinder is started to drive the output end of the cylinder to rise, and then the sleeve is driven to rise, pulling the steel belts on both sides and deforming the elastic hanging ropes. The tension generated by the symmetrical elastic hanging ropes on both sides makes the support rod contact the surface of the pipeline. At the same time, the elastic force generated makes the steel belt and the rubber block tightly wrapped around the pipeline. The friction force formed by the extrusion of the rubber block and the pipeline wall overcomes the gravity of the entire device when it is installed tilted and stabilizes it on the pipeline. While the output end of the cylinder rises, the elastic hanging rope is gradually tightened, and after the support rod contacts the surface of the pipeline, the elastic force of the elastic hanging rope links the support rod to compress the spring, so that the probe gradually approaches the outer wall of the pipeline; At this time, the front end of the ultrasonic detector probe is coated with coupling agent, and the distance between the probe and the outer wall of the pipe is about 1mm. Then start the ultrasonic detector to detect the thickness, cracks, slag inclusions, pores, etc. of the pipeline.

[0023] Compared with the prior art, the present invention can make the device applicable to different pipe diameters by providing a steel belt and a connecting belt, a rubber block and an elastic hanging rope, and can improve the ultrasonic transmission efficiency by providing a positioning protection ring and a connecting belt and filling a coupling agent inside the positioning protection ring; The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ultrasonic detection device for large diameter pipes, characterized in that: The invention comprises a pipeline to be inspected (1), a plurality of steel belts (2) are evenly arranged on the outside of the pipeline (1), hanging rings (3) are fixedly arranged on both sides of the steel belts (2), a first connecting belt (4) is arranged between the two steel belts (2), hooks are arranged at both ends of the first connecting belt (4), a detection device (5) is also arranged at the upper end of the pipeline (1), an elastic hanging rope (6) is passed through the detection device (5), hooks are arranged at both ends of the elastic hanging rope (6), and the hooks of the elastic hanging rope (6) hook the hanging ring (3) on the side of any one of the steel belts (2).

2. The ultrasonic detection device for large diameter pipes according to claim 1, characterized in that: The detection device (5) comprises an installation box (501), and support rods (507) are provided at the four corners of the bottom of the installation box (501); the support rods (507) are against the outer wall of the pipeline (1); a cylinder (502) is fixedly provided at the upper end of the installation box (501) through a fixing frame, and the output end of the cylinder (502) passes through the upper end of the installation box (501) and is loosely matched with the upper end of the installation box (501); a sleeve (503) is fixedly connected to the output end of the cylinder (502), and the two ends of the sleeve (503) are fixedly connected to the elastic hanging rope (6); an ultrasonic detector (504) is built in the installation box (501), and a probe (505) of the ultrasonic detector (504) extends to the outside of the bottom of the installation box (501) and faces the pipeline.

3. The ultrasonic detection device for large diameter pipes according to claim 2, characterized in that: The steel belt (2) is provided with a rubber block (7) on at least one side facing the pipe wall, and the rubber block (7) is provided with a plurality of anti-slip protrusions on the side contacting the pipe wall.

4. The ultrasonic detection device for large diameter pipes according to claim 3, characterized in that: First guide wheels (506) are provided on both sides of the installation box (501) via support frames.

5. The ultrasonic detection device for large diameter pipes according to claim 4, characterized in that: Two L-shaped support plates (516) are provided on both sides of the upper end of the sleeve (503), and mounting plates (514) are also provided on both sides of the upper end of the sleeve (503). A sliding groove is provided on the inner side of the mounting plate (514), and the long end of the L-shaped support plate (516) is slidably connected to the sliding groove; the length of the long end of the L-shaped support plate (516) is greater than the sum of the diameters of the two elastic hanging ropes (6).

6. The ultrasonic detection device for large-diameter pipes according to claim 5, characterized in that: Second guide wheels (515) are also provided at the bottom of the mounting plates (514) on both sides.

7. The ultrasonic detection device for large-diameter pipes according to claim 6, characterized in that: Circular mounting tubes (508) are provided on both sides of the mounting box (501), and ears (509) are provided on both sides of the circular mounting tube (508). The circular mounting tube (508) is fixed to the bottom of the mounting box (501) by bolts, and a spring (510) is provided inside the circular mounting tube (508). The support rod (507) passes through the bottom of the mounting box (501) and is clearance-matched with the bottom of the mounting box (501). A stop plate (511) is provided at the upper end of the support rod (507), and the stop plate (511) is located inside the circular mounting tube (508) and is slidably connected inside the circular mounting tube (508); one end of the spring (510) abuts against the upper end of the circular mounting tube (508), and the other end abuts against the stop plate (511).

8. The ultrasonic detection device for large-diameter pipes according to claim 7, characterized in that: A positioning protection ring (512) is provided below the probe (505); the positioning protection ring (512) is connected to the support rods (507) via a second connecting belt (513), and the positioning protection ring (512) is located directly below the probe; the second connecting belt (513) is elastic, and the positioning protection ring (512) is connected via the second connecting belt (513) so that its position is located at the center of a rectangle formed by the four support rods (507).

9. The ultrasonic detection device for large-diameter pipes according to claim 8, characterized in that: A rotatable roller is provided at the lower end of the support rod (507).

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