CN215866491U - Flexible detection device suitable for austenitic stainless steel pipe oxide deposit - Google Patents
Flexible detection device suitable for austenitic stainless steel pipe oxide deposit Download PDFInfo
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- CN215866491U CN215866491U CN202121139852.0U CN202121139852U CN215866491U CN 215866491 U CN215866491 U CN 215866491U CN 202121139852 U CN202121139852 U CN 202121139852U CN 215866491 U CN215866491 U CN 215866491U
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Abstract
The utility model discloses a flexible detection device suitable for oxide accumulation of an austenitic stainless steel pipe, which comprises a first magnetic pole, a second magnetic pole, a Hall element, a probe assembly and a flexible probe protective cover, wherein the first magnetic pole is connected with the second magnetic pole; the probe assembly is positioned in the flexible probe protective cover and comprises an arc-shaped component, a first magnetic pole, a second magnetic pole and a Hall element, wherein the first magnetic pole, the second magnetic pole and the Hall element are arranged on the arc-shaped component; the opening position department of flexible probe safety cover is provided with the safety cover hasp, the both ends of arc component are connected through elastic connection spare, and the device can solve and use magnetic detection method to measure when the oxide piles up the condition in the austenitic stainless steel pipe at present, because the pipe diameter changes the frequent change probe that causes and traditional probe can't be applicable to the low problem of efficiency that the austenitic stainless steel that closely arranges caused.
Description
Technical Field
The utility model belongs to the field of nondestructive testing, and relates to a flexible testing device suitable for oxide deposits of austenitic stainless steel pipes.
Background
Austenitic stainless steel is widely used in recent years in boiler high-temperature heating surface parts of (supercritical) thermal power generating units at home and abroad due to good ductility, weldability, structural stability, high temperature resistance, steam corrosion resistance and higher heat strength. At present, the austenitic stainless steel materials commonly used in domestic boilers are mainly provided with the brands of TP304H, TP347H, TP347HFG, SUPER304H, HR3C and the like. Because the inner wall of the austenitic stainless steel high-temperature heating surface tube is easy to generate high-temperature oxidation under the action of long-term high-temperature steam, the oxidation product contains a large amount of Fe3O4 and a small amount of Fe2O 3. The expansion coefficients of the oxidation products are greatly different from those of the austenitic matrix metal, the expansion and contraction deformation of the two products are inconsistent when the temperature is changed, larger stress is generated between the two products, when the stress value exceeds the tensile/compressive strength of the oxide scale attached to the inner wall and the bonding strength of the oxide scale and the metal matrix, the oxide scale is cracked and peeled off from the metal surface, and partial oxide scale is deposited at the lower elbow of the heating surface and near the lower elbow. The oxide is easy to be stripped from the metal body due to the violent sudden change of the operation condition. Especially, when the temperature changes repeatedly or violently, such as the start-stop process of the boiler and forced ventilation and rapid cooling during the furnace shutdown, the peeling of the oxides is accelerated. Steam flow in normal operation of a boiler usually cannot take away oxides with large sizes, so that oxide scales are accumulated below an elbow, and blockage and even overtemperature pipe explosion are caused.
At present, the traditional device for detecting the falling and accumulation of the oxides basically adopts a ray method and a magnetic detection method. The ray method and the device have the defects of high equipment cost, time consumption, low detection sensitivity, difficulty in identifying and determining the deposited oxides with small quantity from the image, and certain danger in the working process due to the harmfulness of a ray radioactive source. Therefore, the magnetic detection method has the advantages of cross operation, rapid detection result acquisition and the like, and is widely used at present. When the magnetic detection method works, probes with different sizes are required to be prepared according to the pipe diameters of different steel pipes to be detected, the pipe diameter of the austenitic stainless steel pipe of each boiler is different from phi 38mm to phi 60mm, and therefore, a detector is required to change the probes at any time according to different pipe diameters to match the pipe diameters; in addition, the arrangement of the heating surface of the boiler is compact, the minimum interval between the steel pipes is less than 50mm, the related standard requirements, the magnetic detection probe is light, firm and convenient to use, the working surface of the probe is in good contact with the outer surface of the steel pipe, and the traditional probe cannot be placed between the steel pipes which are closely arranged to complete detection due to certain thickness. The imperfection of the existing equipment causes that the efficiency and the detection proportion are low when the magnetic detection method is adopted to carry out the austenitic stainless steel oxide accumulation detection, and the practical requirement cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a flexible detection device suitable for oxide accumulation of an austenitic stainless steel pipe, which can solve the problems of low efficiency caused by frequent probe replacement due to pipe diameter change and incapability of adapting a traditional probe to tightly-arranged austenitic stainless steel when a magnetic detection method is used for measuring the oxide accumulation condition in the austenitic stainless steel pipe at present.
In order to achieve the aim, the magnetic flexibility detection device for oxide deposits in the austenitic stainless steel pipe comprises a first magnetic pole, a second magnetic pole, a Hall element, a probe assembly and a flexible probe protection cover;
the probe assembly is positioned in the flexible probe protective cover and comprises an arc-shaped component, a first magnetic pole, a second magnetic pole and a Hall element, wherein the first magnetic pole, the second magnetic pole and the Hall element are arranged on the arc-shaped component.
The opening position department of flexible probe safety cover is provided with the safety cover hasp, the both ends of arc component are connected through elastic connection spare.
The arc-shaped member comprises a first connecting rod, a second connecting rod, a first connecting piece and a second connecting piece, wherein the first connecting piece and the second connecting piece respectively comprise a plurality of connecting chain links, adjacent connecting chain links are connected through shaft pins, a first magnetic pole, a second magnetic pole and a Hall element are arranged between the first connecting piece and the second connecting piece, one end of the first connecting piece is connected with one end shaft of the first connecting rod, one end of the second connecting piece is connected with the other end shaft of the first connecting rod, one end of an elastic connecting piece is connected with the middle shaft of the first connecting rod, the other end of the first connecting piece is connected with one end shaft of the second connecting rod, the other end of the second connecting piece is connected with the other end shaft of the second connecting piece, and the other end of the elastic connecting piece is connected with the middle shaft of the second connecting rod.
The first connecting rod and the second connecting rod are both of door-shaped structures.
The first magnetic pole and the second magnetic pole are both permanent magnets.
The N pole of the first magnetic pole faces inwards, and the S pole of the second magnetic pole faces inwards.
The first magnetic pole and the second magnetic pole are distributed oppositely.
During detection, the first magnetic pole and the second magnetic pole are respectively positioned right above and right below the steel pipe to be detected.
And during detection, the Hall element is positioned on the neutral plane axis of the steel pipe to be detected.
The utility model has the following beneficial effects:
when the flexible detection device suitable for the oxide accumulation of the austenitic stainless steel pipe is specifically operated, the probe assembly is positioned in the flexible probe protection cover, the protection cover lock catch is arranged at the opening position of the flexible probe protection cover, the two ends of the arc-shaped component are connected through the elastic connecting piece so as to adapt to pipelines with different sizes, the problems that when the oxide accumulation condition in the austenitic stainless steel pipe is measured by using a magnetic detection method at present, the probes are frequently replaced due to the change of pipe diameters and the traditional probes cannot be suitable for the austenitic stainless steel which is tightly arranged, so that the efficiency is low are solved, and the flexible detection device is simple in structure, convenient to operate and extremely high in practicability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the present invention in actual inspection on a steel pipe.
Wherein, 1 is a flexible probe protective cover, 2 is a protective cover lock catch, 3 is an elastic connecting piece, 4 is a first magnetic pole, 5 is a shaft pin, 6 is a connecting chain link, 7 is a Hall element, and 8 is a second magnetic pole.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the utility model. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The austenitic stainless steel belongs to a weak magnetic material, the main component of oxide skin peeling materials is ferroferric oxide, wherein the ferroferric oxide has ferromagnetism, the oxide skin peeling materials on the inner wall of the austenitic stainless steel boiler tube can be detected by adopting magnetic detection equipment, the accumulation degree of the oxide skin peeling materials is detected, the more the ferromagnetic oxide accumulation amount in the boiler tube is, the stronger the output signal is, and the spatial distribution condition of the oxide skin peeling materials in the boiler tube is determined by detecting the strength change of signals at different parts.
Referring to fig. 1, the magnetic flexible detection device for oxide deposits in austenitic stainless steel pipes according to the present invention comprises a first magnetic pole 4, a second magnetic pole 8, a hall element 7, a probe assembly and a flexible probe protection cover 1
The probe assembly is positioned in the flexible probe protective cover 1 and comprises an arc-shaped component, a first magnetic pole 4, a second magnetic pole 8 and a Hall element 7, wherein the first magnetic pole 4 and the second magnetic pole 8 are distributed oppositely.
The opening position of the flexible probe protective cover 1 is provided with a protective cover lock catch 2, and two ends of the arc-shaped component are connected through an elastic connecting piece 3.
The arc-shaped component comprises a first connecting rod, a second connecting rod, a first connecting piece and a second connecting piece, wherein, first connecting piece and second connecting piece all include a plurality of connecting chain links 6, wherein, be connected through pivot 5 between the adjacent connecting chain link 6, first magnetic pole 4, second magnetic pole 8 and hall element 7 all set up between first connecting piece and second connecting piece, the one end of first connecting piece is connected with the one end hub connection of head rod, the one end of second connecting piece is connected with the other end hub connection of head rod, the one end of elastic connection piece 3 is connected with the middle part hub connection of head rod, the other end of first connecting piece is connected with the one end hub connection of second connecting rod, the other end of second connecting piece is connected with the other end hub connection of second connecting piece, the other end of elastic connection piece 3 is connected with the middle part hub connection of second connecting rod, wherein, head rod and second connecting rod are door shape structure.
The flexible probe protective cover 1 is used for preventing the probe assembly from being influenced by collision and dust in the working process; the elastic connector 3 is used for providing the elastic margin of the probe assembly; the first magnetic pole 4 and the second magnetic pole 8 are both permanent magnets and are symmetrically distributed, wherein the N pole of the first magnetic pole 4 faces inwards, and the S pole of the second magnetic pole 8 faces inwards, so that the magnetic field intensity for magnetizing the steel pipe to be tested in a certain space range is provided; the Hall element 7 is used for detecting the magnetic field component of the stray magnetic field which is established after the oxide in the pipeline is magnetized along the circumferential direction of the pipe wall.
The specific using process of the utility model is as follows:
1) acquiring the pipe diameter of the steel pipe to be measured according to drawing information and actual measurement data;
2) adjusting the number of the connecting chain links 6 to enable the length of the detection device in the unfolding state to be slightly larger than the pipe diameter of the steel pipe to be detected;
3) the utility model in an unfolded state is sleeved on the outer wall of the steel pipe to be tested by using the elastic connecting piece 3 and the protective cover lock catch 2, so that the utility model is ensured to be tightly attached to the outer wall of the steel pipe to be tested, as shown in figure 2;
4) adjusting the circumferential direction of the detection device to ensure that the first magnetic pole 4 and the second magnetic pole 8 are respectively positioned right above and right below the steel pipe to be detected, and the Hall element 7 is positioned on the neutral plane axis of the steel pipe to be detected;
5) on the premise of ensuring that the detection device is tightly attached to the outer wall of the steel pipe to be detected, the device slowly moves along the axial direction of the pipe, and the maximum value in the detection signal of the Hall element 7 is recorded.
And the retest is carried out when necessary, the retest is carried out to ensure that the first magnetic pole 4 and the second magnetic pole 8 are positioned on neutral plane axes at two sides of the steel pipe to be tested in half, and the Hall element 7 is positioned right below the steel pipe to be tested.
Claims (8)
1. The flexible detection device is suitable for oxide accumulation of an austenitic stainless steel pipe and is characterized by comprising a first magnetic pole (4), a second magnetic pole (8), a Hall element (7), a probe assembly and a flexible probe protective cover (1);
the probe assembly is positioned in the flexible probe protective cover (1), and comprises an arc-shaped component, a first magnetic pole (4), a second magnetic pole (8) and a Hall element (7), wherein the first magnetic pole, the second magnetic pole and the Hall element are arranged on the arc-shaped component;
the opening position department of flexible probe safety cover (1) is provided with safety cover hasp (2), the both ends of arc component are connected through elastic connection spare (3).
2. The flexible detection device for oxide accumulation of austenitic stainless steel tube according to claim 1, wherein the arc-shaped member comprises a first connecting rod, a second connecting rod, a first connecting piece and a second connecting piece, wherein the first connecting piece and the second connecting piece each comprise a plurality of connecting chain links (6), wherein adjacent connecting chain links (6) are connected by a shaft pin (5), a first magnetic pole (4), a second magnetic pole (8) and a Hall element (7) are arranged between the first connecting piece and the second connecting piece, one end of the first connecting piece is connected with one end shaft of the first connecting rod, one end of the second connecting piece is connected with the other end shaft of the first connecting rod, one end of the elastic connecting piece (3) is connected with the middle shaft of the first connecting rod, the other end of the first connecting piece is connected with one end shaft of the second connecting rod, the other end of the second connecting piece is connected with the other end shaft of the second connecting piece, the other end of the elastic connecting piece (3) is connected with the middle shaft of the second connecting rod.
3. The apparatus for detecting the oxide deposition of austenitic stainless steel pipe as claimed in claim 2, wherein the first connecting rod and the second connecting rod are both door-shaped.
4. The flexible detection device for oxide accumulation of austenitic stainless steel pipe according to claim 1, characterized in that the first magnetic pole (4) and the second magnetic pole (8) are both permanent magnets.
5. The flexible inspection device for oxide accumulation of austenitic stainless steel pipes as claimed in claim 1, wherein the N-pole of the first magnetic pole (4) faces inward and the S-pole of the second magnetic pole (8) faces inward.
6. The flexible detection device for oxide accumulation of austenitic stainless steel pipe according to claim 1, wherein the first magnetic pole (4) and the second magnetic pole (8) are distributed opposite to each other.
7. The flexible detection device for the oxide accumulation of the austenitic stainless steel pipe according to claim 1, wherein the first magnetic pole (4) and the second magnetic pole (8) are respectively located right above and right below the steel pipe to be detected during detection.
8. The flexible detection device for oxide accumulation of austenitic stainless steel pipe according to claim 1, characterized in that, during detection, the Hall element (7) is located on the neutral plane axis of the steel pipe to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121139852.0U CN215866491U (en) | 2021-05-25 | 2021-05-25 | Flexible detection device suitable for austenitic stainless steel pipe oxide deposit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121139852.0U CN215866491U (en) | 2021-05-25 | 2021-05-25 | Flexible detection device suitable for austenitic stainless steel pipe oxide deposit |
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| CN215866491U true CN215866491U (en) | 2022-02-18 |
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| CN202121139852.0U Active CN215866491U (en) | 2021-05-25 | 2021-05-25 | Flexible detection device suitable for austenitic stainless steel pipe oxide deposit |
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- 2021-05-25 CN CN202121139852.0U patent/CN215866491U/en active Active
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