Ultrasonic detector for pipeline damageTechnical Field
The application relates to the field of detection technology, in particular to an ultrasonic detector for pipeline damage.
Background
The purpose of the pipeline damage detection is to ascertain whether the pipeline is damaged by pipeline corrosion, pipeline cracks, pipeline leakage and the like. The method for detecting the damage of the pipeline comprises detection methods such as magnetic leakage, vortex, rays, magnetic powder, ultrasonic waves and the like.
Ultrasonic refers to elastic mechanical waves having a frequency greater than 20KHz and capable of propagating in a continuous medium. The ultrasonic detection of the damage to the pipeline is to utilize an ultrasonic transducer to emit ultrasonic waves perpendicular to the pipeline wall, and when the ultrasonic waves meet interfaces such as pipeline cracks, air holes in the wall, inner walls and outer walls of the pipeline, etc., the reflected ultrasonic waves contain the information of the pipeline wall, so that the damage to the pipeline is detected.
The basic method of ultrasonic detection comprises a pulse reflection method and a penetration method, wherein the penetration method cannot be applied to in-tube detection because ultrasonic transducers are arranged on two sides of an object to be detected.
Referring to fig. 1, in the pulse reflection method, H represents the wall thickness of the pipe, and L represents the distance between the ultrasonic transducer and the inner wall of the pipe. When the ultrasonic transducer detects external damage, H is reduced, and L is unchanged; when the ultrasonic transducer detects an internal lesion, L increases and H decreases. It is thus possible to determine whether the detected damage is an internal damage or an external damage of the pipeline.
Aiming at the problem that couplant is needed for ultrasonic in-pipe detection, a wheel type ultrasonic probe structure is designed in the industry, and referring to fig. 2, the wheel type ultrasonic probe structure realizes dry coupling of an ultrasonic transducer and the inner wall of a pipeline, and then a pulse reflection method is used for detecting pipeline damage.
In the above related art, since the wheel type ultrasonic probe can only move along the length direction of the pipeline for detection, the circumferential position of the pipeline which cannot be detected often occurs in the detection process, so that the coverage range of the wheel type ultrasonic probe in the detection process is not wide, and a worker is required to detect for many times, so as to ensure complete coverage of the circumferential position of the pipeline in the detection process, thereby reducing the detection efficiency.
Disclosure of utility model
In order to improve the detection efficiency, the application provides a pipeline damage ultrasonic detector.
The application provides a pipeline damage ultrasonic detector which adopts the following technical scheme:
The ultrasonic detector for the pipeline damage comprises a supporting main shaft and a plurality of wheel type detection mechanisms which are sequentially arranged on the supporting main shaft;
The wheel type detection mechanism comprises a sleeve and a plurality of wheel type ultrasonic probes; the sleeve is coaxially arranged on the supporting main shaft, and the wheel type ultrasonic probes are circumferentially arranged on the sleeve along the central line axis of the sleeve;
Projection of a plurality of wheel type ultrasonic probes on the wheel type detection mechanisms on the supporting main shaft is distributed in an equidistant surrounding mode along the central axis of the supporting main shaft.
Through adopting above-mentioned technical scheme, in a detector, because a plurality of wheeled ultrasonic transducer are equidistant around the central axis of supporting the main shaft along supporting the projection on the main shaft and distributing, consequently a plurality of wheeled ultrasonic transducer can carry out equidistant all-round coverage to pipeline circumference direction when moving on the pipeline inner wall. Therefore, when the pipeline damage detection is carried out by a worker, the detector is only required to be placed in the pipeline and then moved to the other end from one end of the pipeline, the circumferential position of the pipeline can be effectively covered in the pipeline damage detection process, the possibility that the worker carries out multiple detection is reduced, and the detection efficiency can be effectively improved.
Optionally, the wheel type detection mechanism further includes a plurality of adjustment support assemblies disposed on the sleeve, and the plurality of wheel type ultrasonic probes are disposed on the plurality of adjustment support assemblies one-to-one;
The adjusting support assembly comprises a connecting plate, two limit sliding rods and a plurality of telescopic pieces capable of adjusting the length, and annular support parts are coaxially arranged at two ends of the sleeve respectively; the two ends of the telescopic piece are respectively and rotatably arranged on one side of the annular supporting part and one side of the wheel type ultrasonic probe;
Two ends of the connecting plate are respectively arranged on the two annular supporting parts; one end of the limiting sliding rod is fixedly connected to one side of the wheel type ultrasonic probe, the other end of the limiting sliding rod slides through the connecting plate, and the limiting sliding rod is perpendicular to the supporting main shaft.
Through adopting above-mentioned technical scheme, annular supporting part can provide connection interface for a plurality of extensible members, and the link plate can slide the support to spacing slide bar, because spacing slide bar and wheeled ultrasonic probe fixed connection, and link plate and spacing slide bar slide and be connected, consequently spacing slide plate can carry out spacingly to wheeled ultrasonic probe to reduce wheeled ultrasonic probe and produce the possibility of skew. The wheeled ultrasound probe can be moved toward the end remote from the sleeve when the telescoping member is extended. The wheel type ultrasonic probe can be moved toward one end close to the sleeve when the telescopic member is shortened. Thereby enabling the detector to be adapted for use in pipe damage detection of different inner diameters.
Optionally, the telescopic piece comprises a sleeve shaft, a sliding shaft and a telescopic spring;
One end of the sleeve shaft is rotatably arranged on the annular supporting part, and the other end of the sleeve shaft is glidingly sleeved at one end of the glide shaft; the other end of the sliding shaft is rotatably arranged at one side of the wheel type ultrasonic probe;
The sleeve shaft is provided with a first annular supporting seat, and one end of the sliding shaft, which is far away from the sleeve shaft, is provided with a second annular supporting seat; the telescopic spring is sleeved on the sliding shaft, and two ends of the telescopic spring are respectively arranged on the first annular supporting seat and the second annular supporting seat.
Through adopting above-mentioned technical scheme, when wheeled ultrasonic probe moved on the inner wall of pipeline, if the pipeline internal diameter is narrowed, then slide the axle and can slide in the sleeve axle, the expansion spring pressurized shortens to make wheeled ultrasonic probe withdraw towards the sleeve. If the inner diameter of the pipeline is increased, the sliding shaft can slide outwards of the sleeve shaft, and the telescopic spring is increased, so that the wheel type ultrasonic probe is far away from the sleeve.
Optionally, the telescopic spring is made of a memory alloy material.
Through adopting above-mentioned technical scheme, the material has good corrosion resistance and resilience effect in the memory total, is applicable to abominable operation environment, can effectively promote expansion spring's life.
Optionally, the wheel type ultrasonic probe comprises a main shaft, an ultrasonic transducer, a rubber wheel, two sealing bearings and two bearing end covers;
The two sealing bearings are respectively and coaxially sleeved at the two ends of the main shaft, the two bearing end covers are coaxially arranged on the two sealing bearings one by one, and the rubber wheel is arranged on the two bearing end covers;
A liquid storage cavity is formed in the rubber wheel, water is filled in the liquid storage cavity, the ultrasonic transducer is arranged on the main shaft, and the ultrasonic transducer is positioned in the liquid storage cavity and faces to one side far away from the sleeve;
The two ends of the main shaft are respectively provided with a connecting plate, the sliding shaft is rotatably arranged on the connecting plates, and the limiting sliding rod is fixedly connected with the connecting plates.
Through adopting above-mentioned technical scheme, when sealed bearing, two bearing end caps rotate along the central axis of main shaft together with the rubber wheel, the main shaft can not rotate to realize wheeled ultrasonic probe's removal on the pipeline inner wall, and guarantee to slide the rotation connection between the axle. And under the spacing of spacing slide bar, whole wheeled ultrasonic probe is difficult for producing the skew to can make ultrasonic transducer perpendicular to the inner wall of pipeline all the time, thereby make ultrasonic transducer transmitted ultrasonic signal pass through "water-rubber-pipeline inner wall", reflect back after reaching the pipeline outer wall, in order to realize the ultrasonic detection to the pipeline damage.
Optionally, the wheel type ultrasonic probe further comprises two sealing end covers coaxially sleeved at two ends of the main shaft respectively, and the sealing end covers are used for sealing the sealing bearing.
By adopting the technical scheme, the sealing end cover can seal the joint of the sealing bearing, so that the possibility that water leaks from the liquid storage cavity can be effectively reduced.
Optionally, the wheeled ultrasonic probe further comprises two compacting plates coaxially sleeved on the two bearing end covers respectively, and one side of the rubber wheel is propped between the sealing end covers and the compacting plates.
Through adopting above-mentioned technical scheme, the pressure strip can compress tightly the rubber wheel to promote the stability of rubber wheel installation, and promote the gas tightness of rubber wheel.
Optionally, a one-way valve communicated with the liquid storage cavity is arranged on the bearing end cover.
Through adopting above-mentioned technical scheme, the check valve can be convenient for to the injection water in the stock solution cavity, also can be convenient for make the stock solution cavity keep certain pressure in the while.
In summary, the present application includes at least one of the following beneficial technical effects: when the pipeline damage is detected, the worker only needs to place the detector in the pipeline and then move the detector from one end of the pipeline to the other end, and the circumferential position of the pipeline can be effectively covered in the pipeline damage detection process, so that the possibility that the worker detects for many times is reduced, and the detection efficiency can be effectively improved.
Drawings
Fig. 1 is a schematic diagram of a pulse reflection method.
Fig. 2 is a schematic diagram of a wheel type ultrasonic probe structure and pipeline defect detection.
Fig. 3 is a schematic overall structure of an embodiment of the present application.
Fig. 4 is a perspective view of a plurality of wheeled ultrasound probes along the central axis of a support shaft in an embodiment of the present application.
Fig. 5 is a schematic diagram of the connection of the wheel inspection mechanism and the support spindle in an embodiment of the present application.
Fig. 6 is a schematic structural view of a wheel type ultrasonic probe in an embodiment of the present application.
Fig. 7 is a schematic cross-sectional view of a wheel type ultrasonic probe according to an embodiment of the present application.
Reference numerals: 1. supporting a main shaft; 11. a guide slot; 2. a wheel type detection mechanism; 3. a sleeve; 31. guiding the strip; 32. an annular support portion; 4. adjusting the support assembly; 41. a sleeve shaft; 411. a first annular support base; 42. a slip shaft; 421. a second annular support seat; 43. a telescopic spring; 44. a connecting plate; 441. a slip support part; 45. a limit sliding rod; 5. a wheeled ultrasonic probe; 51. a main shaft; 511. a connecting circular plate; 512. a sensor fixing sleeve; 513. a seal ring; 52. an ultrasonic transducer; 53. a rubber wheel; 531. an annular protrusion; 54. sealing the bearing; 55. a bearing end cap; 551. an annular groove; 56. a one-way valve; 57. a compacting plate; 58. and sealing the end cover.
Detailed Description
The application is described in further detail below with reference to fig. 3-7.
The embodiment of the application discloses a pipeline damage ultrasonic detector.
Referring to fig. 3 and 4, an ultrasonic detector for pipe damage includes a support main shaft 1 and a plurality of wheel-type detecting mechanisms 2, wherein the wheel-type detecting mechanisms 2 are sequentially sleeved and fixed on the support main shaft 1, and projections of the wheel-type detecting mechanisms 2 on the support main shaft 1 are not overlapped with each other.
Referring to fig. 3, 4 and 5, the wheel type inspection mechanism 2 includes a sleeve 3, a plurality of adjustment support assemblies 4 and a plurality of wheel type ultrasonic probes 5. The sleeve 3 is sleeved and fixed on the supporting main shaft 1, the plurality of adjusting and supporting components 4 are arranged on the outer wall of the sleeve 3, and the plurality of wheel type ultrasonic probes 5 are arranged on the plurality of adjusting and supporting components 4 one by one. And a plurality of adjusting support components 4 are distributed around the central axis of the sleeve 3 at equal intervals, and a plurality of wheel type ultrasonic probes 5 are distributed around the central axis of the sleeve 3 at equal intervals. The projections of the wheel type ultrasonic probes 5 on the supporting main shaft 1 on the plurality of adjusting supporting components 4 are distributed around the central axis of the supporting main shaft 1 at equal intervals.
Meanwhile, a plurality of guide long grooves 11 are formed in the outer wall of the support main shaft 1, the plurality of guide long grooves 11 are formed in the length direction of the support main shaft 1, the number of the guide long grooves 11 is the same as that of the wheel type detection mechanisms 2, and the plurality of guide long grooves 11 are all located on one side of the support main shaft 1. The inner wall of the sleeve 3 is integrally formed with a guiding strip 31, the guiding strip 31 is arranged along the length direction of the sleeve 3, and the guiding strip 31 is slidingly connected in one of the guiding long grooves 11, so that the positions of the wheel type ultrasonic probes 5 are determined.
In the embodiment of the application, the number of the wheel type detection mechanisms 2 is four, the number of the guide long grooves 11 is four corresponding to the number of the wheel type detection mechanisms 2, and the number of the wheel type ultrasonic probes 5 on the single wheel type detection mechanism 2 is five. Since the plurality of wheel type ultrasonic probes 5 on the single wheel type detection mechanism 2 are distributed circumferentially at equal intervals along the central axis of the sleeve 3, the included angle between two adjacent wheel type ultrasonic probes 5 on the single wheel type detection mechanism 2 is 90 degrees (four wheel type ultrasonic probes 5 in total). Since projections of the plurality of wheel type ultrasonic probes 5 on the plurality of wheel type detection mechanisms 2 on the support main shaft 1 are distributed circumferentially at equal intervals along the central axis of the support main shaft 1, an included angle between any two adjacent wheel type ultrasonic probes 5 on the projections is 18 degrees (twenty wheel type ultrasonic probes 5 in total). Therefore, in order to ensure that the included angle between any two adjacent wheel-type ultrasonic probes 5 on projection is 18 degrees, the included angle formed by the connecting lines of the adjacent two guiding long grooves 11 and the central axis of the supporting main shaft 1 is set to be 18 degrees, namely, the dislocation angle is 18 degrees.
In other embodiments, the number of the wheel type detection mechanisms 2 may be two or more, the number of the guide long grooves 11 may be the same as the number of the wheel type detection mechanisms 2, and the number of the wheel type ultrasonic probes 5 on the single wheel type detection mechanism 2 may be two or more. The projection of the wheel type ultrasonic probes 5 on the supporting main shaft 1 only needs to be uniformly distributed along the central axis of the supporting main shaft 1 in a surrounding mode.
When the pipeline is detected, the plurality of wheel type ultrasonic probes 5 on the detector can cover the inner wall of the pipeline as much as possible, and when the detector passes through the pipeline, the detection of the pipeline can be completed at one time, so that the detection efficiency is improved.
Referring to fig. 3 and 5, the adjusting and supporting assembly 4 includes a link plate 44, two limit sliding rods 45, and a plurality of telescopic members capable of length extension and retraction. The sleeve 3 has annular supporting parts 32 formed integrally and coaxially at both ends, and one end of the telescopic member is rotatably connected to the annular supporting parts 32 and the other end is rotatably connected to one side of the wheel type ultrasonic probe 5. And the wheel type ultrasonic probe 5 is positioned above the middle section of the sleeve 3, one side of the wheel type ultrasonic probe 5 is provided with two telescopic pieces, and the two telescopic pieces on one side are respectively connected with the two annular supporting parts 32 in a rotating way.
Two ends of the connecting plate 44 are fixedly connected to edges of the two annular supporting portions 32 respectively, two sides of the middle section of the connecting plate 44 are integrally provided with sliding supporting portions 441 respectively, one end of the limiting sliding rod 45 is fixedly connected to one side of the wheel type ultrasonic probe 5, the other end of the limiting sliding rod slides through the annular supporting portions 32, and the limiting sliding rod 45 is perpendicular to the supporting main shaft 1.
The telescopic member comprises a sleeve shaft 41, a sliding shaft 42 and a telescopic spring 43. One end of the sleeve shaft 41 is hinged on the annular supporting portion 32, one end of the sliding shaft 42 is slidably arranged at one end of the sleeve shaft 41 far away from the annular supporting portion 32, and the other end of the sliding shaft 42 is hinged on one side of the wheel type ultrasonic probe 5. The sleeve shaft 41 is provided with a first annular supporting seat 411 at one end close to the sliding shaft 42, and a second annular supporting seat 421 at one end far away from the sleeve shaft 41. The telescopic spring 43 is sleeved on the sliding shaft 42, and two ends of the telescopic spring 43 are respectively and fixedly connected to the first annular supporting seat 411 and the second annular supporting seat 421.
When the wheel type ultrasonic probe 5 is pressed by the inner wall of the pipeline, the four telescopic members shrink simultaneously and rotate correspondingly, at the moment, the sliding shaft 42 slides into the sleeve shaft 41, the telescopic spring 43 is pressed to be shortened, and the wheel type ultrasonic probe 5 moves towards the sleeve 3 so as to adapt to pipeline inspection with smaller inner diameter. Meanwhile, the limit sliding rod 45 slides towards the support main shaft 1 to make the telescopic change lengths of the plurality of telescopic springs 43 consistent, thereby avoiding the wheel type ultrasonic probe 5 from generating deflection. When the detection is completed, the extension spring 43 is reset, so that the sliding shaft 42 slides out from the sleeve shaft 41, and the wheel type ultrasonic probe 5 moves away from the sleeve 3, thereby resetting the wheel type ultrasonic probe 5.
In the embodiment of the application, the telescopic spring 43 is made of a memory alloy material, the memory alloy material is corrosion-resistant and has good rebound effect, and the service life of the telescopic spring 43 can be effectively prolonged by adopting the telescopic spring 43 as the memory alloy material.
Referring to fig. 3, 5, 6 and 7, the wheel type ultrasonic probe 5 includes a main shaft 51, an ultrasonic transducer 52, a rubber wheel 53, two seal bearings 54, two bearing caps 55. The two ends of the main shaft 51 are respectively and coaxially fixedly connected with a connecting circular plate 511, the connecting circular plate 511 at one end of the main shaft 51 is hinged with the ends of the two sliding shafts 42, and the connecting circular plate 511 at one end of the main shaft 51 is fixedly connected with the limiting sliding rod 45. The limiting sliding rod 45 is located between the two sliding shafts 42, and the two sliding shafts 42 are symmetrically located on two sides of the limiting sliding rod 45. Thereby realizing the connection between the wheel type ultrasonic probe 5 and the plurality of slip shafts 42.
Referring to fig. 5, 6 and 7, two sealing bearings 54 are coaxially sleeved and fixed at both ends of the main shaft 51, respectively, and the two sealing bearings 54 are located between the two connection circular plates 511, and two bearing end caps 55 are coaxially and fixedly connected to the two sealing bearings 54 one by one. The inner side of the rubber wheel 53 is provided with an annular protrusion 531, the bearing end covers 55 are provided with annular grooves 551, the rubber wheel 53 is sleeved and fixed on the two bearing end covers 55, and the annular protrusion 531 is clamped in the annular grooves 551.
The middle section of main shaft 51 has seted up the installation cavity, and the fixed sleeve 512 of sensor of fixedly connected with in the installation cavity, ultrasonic transducer 52 fixed connection is in the fixed sleeve 512 of sensor, and ultrasonic transducer 52 is perpendicular to main shaft 51. Under the limit of the limit sliding rod 45, the detection end of the ultrasonic transducer 52 can always face to the end far away from the sleeve 3, that is, the detection end of the ultrasonic transducer 52 is always vertical to the inner wall of the pipeline during detection. A liquid storage cavity is formed in the rubber wheel 53, the ultrasonic transducer 52 is positioned in the liquid storage cavity, and water is filled in the liquid storage cavity. Meanwhile, in order to prevent water from overflowing, the inner wall of the opening of the fixed sleeve 3 is embedded with a sealing ring 513, and the sealing ring 513 can block water, so that the possibility that water enters the fixed sleeve 3 and affects the ultrasonic transducer 52 is reduced.
Meanwhile, one of the bearing end covers 55 is provided with a one-way valve 56, and the one-way valve 56 is communicated with the liquid storage cavity. The provision of the one-way valve 56 can facilitate injection of water into the reservoir cavity, while also facilitating ensuring that a certain pressure is maintained in the reservoir cavity.
When the rubber wheel 53 is abutted against the inner wall of the pipeline and moves on the inner wall of the pipeline, the main shaft 51 always keeps not rotating because the rubber wheel 53 rotates around the sealing bearing 54, the ultrasonic transducer 52 always faces the inner wall of the pipeline, and the ultrasonic signal emitted by the ultrasonic transducer 52 passes through the water-rubber-inner wall of the pipeline and then is reflected back after reaching the outer wall of the pipeline, so that ultrasonic detection of damage to the pipeline is realized.
Meanwhile, referring to fig. 7, the wheel type ultrasonic probe 5 further includes two pressing plates 57 and two sealing end caps 58. The two compacting plates 57 are coaxially sleeved and fixed on the two bearing end covers 55 one by one, and one side of the rubber wheel 53 is propped between the sealing end cover 58 and the compacting plates 57, so that the air tightness of the liquid storage cavity is improved. The two sealing end covers 58 are respectively and coaxially sleeved at two ends of the main shaft 51, and the two sealing end covers 58 are fixedly connected to the two bearing end covers 55 one by one, so that the joint of the sealing bearings 54 can be sealed by the sealing end covers 58, and the air tightness of the liquid storage cavity is improved.
The implementation principle of the ultrasonic detector for the pipeline damage provided by the embodiment of the application is as follows: when the damage detection of the pipeline is carried out, a worker only needs to place the detector in the pipeline, then the detector is moved from one end of the pipeline to the other end, and in the process, a plurality of wheel type ultrasonic probes 5 on the detector can roll on the inner wall of the pipeline and damage detection is carried out through the ultrasonic transducer 52. Because the projection of a plurality of wheeled ultrasonic transducer 5 on the detector on supporting main shaft 1 is equidistant around the central axis of supporting main shaft 1 and distributes, consequently the detector is along the length direction of pipeline removal detection's in-process, can carry out fine detection to the circumference position of pipeline to reduce the staff and carry out the possibility that detects many times, thereby can effectively promote the efficiency that detects.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.