CN108828061B - Eddy current detection device for surface micro-defects of stainless steel seamless short pipe - Google Patents
Eddy current detection device for surface micro-defects of stainless steel seamless short pipe Download PDFInfo
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- CN108828061B CN108828061B CN201810613801.3A CN201810613801A CN108828061B CN 108828061 B CN108828061 B CN 108828061B CN 201810613801 A CN201810613801 A CN 201810613801A CN 108828061 B CN108828061 B CN 108828061B
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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- G01N27/902—Arrangements for scanning by moving the sensors
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Abstract
The invention discloses an eddy current testing device for the surface micro-defects of a stainless steel seamless short pipe, wherein a connecting and mounting plate is fixedly connected with an external driving mechanism; one end of the movable guide rod penetrates through the connecting mounting plate to be fixedly connected with a rotary limiting plate for limiting the downward movement of the movable guide rod, and the other end of the movable guide rod is fixedly connected with the mounting bracket; the compression spring is sleeved on the movable guide rod and used for applying downward pressure on the mounting bracket; the detachable plate is detachably connected with the mounting bracket; the V-shaped block is rotationally connected with the detachable plate and the mounting bracket; the bottom of the V-shaped block is provided with a V-shaped groove; the eddy current point type probe is positioned in the central area of the V-shaped block and is arranged outwards opposite to the bottom of the V-shaped groove; the V-shaped groove is used for being clamped on the surface of the detected stainless steel seamless short pipe. The invention ensures that the lift-off distance is kept consistent in the detection process of the eddy current point type probe, avoids the influence of the lift-off effect in the detection process and finally ensures the reliability of the detection result.
Description
Technical Field
The invention belongs to the technical field of eddy nondestructive testing, and particularly relates to an eddy current testing device for micro defects on the surface of a stainless steel seamless short pipe.
Background
The eddy current flaw detection is one of the main detection means for the defects of the outer wall of the stainless steel seamless short pipe, has the advantages of high detection speed and high detection sensitivity, does not need to detect a coupling medium, has no pollution to the environment, and has been widely applied. The two most common types of eddy current inspection are through-type inspection and point-type inspection, as shown in fig. 1 and 2:
when the through type flaw detection is adopted, the stainless steel seamless steel pipe passes through the inner hole of the probe at a high speed to finish the flaw detection; when point type flaw detection is adopted, because the effective detection area of the point probe is small, the scanning of the whole cylindrical surface of the stainless steel seamless steel pipe needs to be completed, relative spiral motion needs to be formed between the point probe and the seamless steel pipe, and the screw pitch does not exceed the effective detection distance of the point probe. From the viewpoint of flaw detection precision, point flaw detection far exceeds penetration type flaw detection, and the main reason is that the resolution of defects far exceeds penetration type eddy current flaw detection because an electromagnetic field is relatively concentrated during eddy current point flaw detection.
When the eddy current point type is detected a flaw, the relative spiral motion between the eddy current point probe and the seamless steel tube is realized, and two modes can be adopted: one mode is that the probe rotates at a high speed around the axis of the seamless steel pipe while the seamless steel pipe moves linearly at a constant speed along the axis, and the problem of coupling transmission of electric signals needs to be considered due to the high-speed rotation of the eddy current probe during detection, so that the detection structure is complex; the other mode is that the eddy current point probe moves along the axis of the steel pipe at a constant speed and the seamless steel pipe rotates around the axis at a high speed, and the coupling transmission of the electric signals is easy to realize during detection, and the detection structure is simple and reliable.
Although eddy current spot flaw detection has high detection accuracy, the eddy current spot flaw detection is greatly affected by lift-off effect (i.e., change in distance between the end face of the eddy current spot probe and the surface of the seamless steel pipe to be detected), and the detection sensitivity is higher when the lift-off distance is smaller, and the lift-off distance is usually less than 0.5 mm. In the engineering detection process, the lifting distance is easy to change under the influence of the position change of the eddy current point probe, the standard exceeding of the cylindricity of the seamless steel pipe, the standard exceeding of the straightness of the seamless steel pipe and the like, and the tiny change can bring great influence to a detection signal, so that the uncertainty of a detection result is finally caused.
Disclosure of Invention
The invention aims to ensure the lifting distance of the eddy current point probe and realize accurate judgment of the micro defects on the outer surface of the stainless steel seamless short pipe by a flexible and reliable detection device based on a detection mode that the stainless steel seamless short pipe rotates at a high speed and the eddy current point probe moves at a constant speed.
In order to achieve the purpose, the invention adopts the technical scheme that:
a vortex detection device for the surface micro-defects of a stainless steel seamless short pipe comprises a connecting mounting plate, a moving guide rod, a rotating limiting plate, a compression spring, a mounting bracket, a detachable plate, a V-shaped block and a vortex point type probe; the connecting mounting plate is fixedly connected with an external driving mechanism; one end of the movable guide rod penetrates through the connecting mounting plate to be fixedly connected with the rotary limiting plate for limiting the downward movement of the movable guide rod, and the other end of the movable guide rod is fixedly connected with the mounting bracket; the compression spring is sleeved on the movable guide rod and used for applying pressure to enable the rotary limiting plate to abut against the connecting mounting plate; the detachable plate is detachably connected with the mounting bracket; the V-shaped block is rotatably connected with the detachable plate and the mounting bracket; the bottom of the V-shaped block is provided with a V-shaped groove; the eddy current point type probe is positioned in the central area of the V-shaped block and is arranged outwards right opposite to the bottom of the V-shaped groove; the V-shaped groove is used for being clamped on the surface of the detected stainless steel seamless short pipe.
Preferably, the eddy current testing device comprises a linear bearing, wherein the upper part of the linear bearing is of a cylindrical structure, and the lower part of the linear bearing is provided with a flange end cover; the cylinder structure protrudes into the connecting mounting plate, and the flange end cover is fixedly connected with the connecting mounting plate; the movable guide rod comprises an upper section guide rod, a middle section guide rod and a lower section guide rod which are coaxially formed from top to bottom, and the radius of the middle section guide rod is larger than that of the upper section guide rod and that of the lower section guide rod; the top of the upper section guide rod sequentially penetrates through the cylindrical structure and the connecting mounting plate to be fixedly connected with the rotary limiting plate; the compression spring is sleeved on the upper section guide rod, the upper end of the compression spring is abutted against the flange end cover, and the lower end of the compression spring is abutted against the upper shaft shoulder of the middle section guide rod; the mounting bracket is provided with a guide rod mounting hole, and the lower guide rod is mounted on the guide rod mounting hole; and the lower shaft shoulder of the middle guide rod is axially positioned with the mounting bracket.
Preferably, a fastening screw hole is vertical to and communicated with the guide rod mounting hole; one side of the lower section guide rod is reamed flat and used for fixing the lower section guide rod through the fastening screw hole by a fastening screw.
Preferably, the rotary limiting plate comprises a horizontal section and a vertical section, and the horizontal section and the vertical section form an L-shaped structure; the horizontal section is in threaded connection with the top of the upper section guide rod through a connecting and positioning bolt, and the vertical section moves linearly along the right-angle groove on the connecting and mounting plate and cannot rotate.
Preferably, step holes are formed in symmetrical positions of the detachable plate and the mounting bracket respectively, miniature self-aligning ball bearings are mounted on the step holes, and two sides of the V-shaped block are connected with the miniature self-aligning ball bearings on two sides through rotating shafts respectively.
Preferably, an arc-shaped groove is formed in the mounting bracket or the detachable plate, a rotary limiting shaft is arranged on one corresponding side of the V-shaped block, and the rotary limiting shaft is matched with the arc-shaped groove to limit excessive rotation of the V-shaped block.
Preferably, two extension springs are connected between the mounting bracket and the V-shaped block; the two extension springs are used for enabling the V-shaped block to return to an initial balance state.
Preferably, the extension spring is a coil spring with a hook.
Preferably, a through hole is formed in the central area of the V-shaped block; and the eddy current point type probe is sleeved with an elastic clamping sleeve, the eddy current point type probe and the elastic clamping sleeve are arranged in the through hole, and the elastic clamping sleeve is tightly propped through a set screw.
Preferably, the elastic clamping sleeve is provided with an opening.
Compared with the prior art, the invention has the beneficial effects that:
the invention ensures that the lift-off distance is kept consistent in the detection process of the eddy current point type probe, avoids the influence of the lift-off effect in the detection process and finally ensures the reliability of the detection result;
the eddy current detection device related by the invention is self-integrated, can be integrated with different detection mechanisms, and is quick and convenient to install;
the eddy current testing device is suitable for detecting the micro defects on the outer walls of various stainless steel seamless short pipes with different diameters, and the probe is quickly and conveniently adjusted when the steel pipes with different diameters are replaced for detection.
Drawings
FIG. 1 is a schematic view of a prior art eddy current flow through inspection;
FIG. 2 is a schematic diagram of eddy current spot inspection of the prior art;
FIG. 3 is a schematic structural diagram of an eddy current testing apparatus for detecting micro-defects on the surface of a stainless steel seamless short pipe according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a connection mounting plate according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a rotation limiting plate according to an embodiment of the invention;
FIG. 6 is a schematic view of a moving guide according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a linear bearing according to an embodiment of the present invention;
FIG. 8 is a schematic view of a compression spring according to an embodiment of the present invention;
FIG. 9 is a schematic view of the mounting bracket and the V-block assembly according to one embodiment of the present invention;
FIG. 10 is a schematic view of the mounting bracket and the removable panel assembly according to one embodiment of the present invention;
FIG. 11 is a schematic view of an assembly of a V-block and components thereon according to an embodiment of the present invention;
FIG. 12 is a cross-sectional view of the V-block of FIG. 11;
FIG. 13 is a schematic view of a resilient clamping sleeve according to an embodiment of the present invention;
FIG. 14 is a schematic structural diagram of an extension spring according to an embodiment of the present invention;
FIG. 15 is a schematic view of an embodiment of the present invention in which the lift-off distance is constant during circumferential rotation;
FIG. 16 is a schematic view of an embodiment of the present invention showing that the lift-off distance is constant when the axis of the steel pipe is not perpendicular to the centerline of the inspection device, wherein (a) the drawing shows that the axis of the steel pipe is perpendicular to the centerline of the inspection device; (b) the drawing shows that the axis of the steel pipe is not perpendicular to the centerline of the detection device.
In the drawings, 1-attachment mounting plate; 2-a linear bearing; 3-compression spring; 4-moving the guide rod; 5, mounting a bracket; 6-detachable plate; 7-a connection screw; 8-a miniature self-aligning ball bearing; 9-a rotating shaft; 10-V shaped blocks; 11-stainless steel seamless short pipe; 12-a rotating shaft; 13-a miniature self-aligning ball bearing; 14-rotating the limiting shaft; 15-eddy current point probe; 16-set screws; 17-rotating the limit plate; 18-connecting a positioning bolt; 19-vortex flow-through probe; 20-guide bar mounting holes; 21-fastening screw holes; 22-a stepped bore; 23-an arc-shaped groove; 24-set screws; 25-elastic clamping sleeve; 26-V type groove; 27-right angle grooves; 28-mounting screw holes; 29-installing screw holes; 30-mounting holes; 31-a connection hole; 32-upper guide rod; 33-middle guide rod; 34-lower section guide rod; 35-upper shaft shoulder; 36-lower shoulder; 38-spot facing plane; 39-positioning screw holes; 40-flange end cap; 41-cylindrical structure; 42. 43-extension spring; 44-set screws; 45. 46-fixing the screw hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 3 to 14, an eddy current testing apparatus for detecting micro defects on the surface of a stainless steel seamless short pipe comprises a connecting mounting plate 1, a moving guide rod 4, a rotation limiting plate 17, a compression spring 3, a mounting bracket 5, a detachable plate 6, a V-shaped block 10 and an eddy current point type probe 15. The connecting and mounting plate 1 is fixedly connected with an external driving mechanism. One end of the movable guide rod 4 penetrates through the connecting and mounting plate 1 to be fixedly connected with a rotary limiting plate 17 used for limiting the downward movement of the movable guide rod 4, and the other end of the movable guide rod is fixedly connected with the mounting bracket 5. The compression spring 3 is sleeved on the movable guide rod 4, the compression spring 3 is used for preventing the movable guide rod 4 from excessively moving upwards to cause the rotation limiting plate 17 to be separated from the connecting mounting plate 1 in the detection process, and meanwhile, pressure is provided for keeping the lifting distance between the eddy current point type probe 15 and the detected stainless steel seamless short pipe 11. The detachable plate 6 is detachably mounted and connected with the mounting bracket 5. The V-block 10 is pivotally connected to the removable plate 6 and the mounting bracket 5. The bottom of the V-block 10 has a V-groove 26. The eddy current point type probe 15 is positioned in the central area of the V-shaped block 10 and is arranged opposite to the bottom of the V-shaped groove 26, and the distance that the eddy current point type probe 15 extends out of the bottom of the V-shaped groove 26 can be adjusted. The V-shaped groove 26 is used for being clamped on the surface of the stainless steel seamless short pipe 11 to be detected.
In one embodiment, the attachment mounting plate 1 (shown in FIG. 4) is provided with 4 mounting screw holes 28, 4 mounting screw holes 29, 1 mounting hole 30, and 1 right-angle recess 27. The whole eddy current testing device is fixedly connected with an external driving mechanism by the connecting and mounting plate 1 through 4 screws and 4 mounting screw holes 28. The upper part of the linear bearing 2 (as shown in fig. 7) is a cylindrical structure 41, the lower part is a flange end cover 40, the cylindrical structure 41 protrudes into the mounting hole 30, the flange end cover 40 is left outside the connecting mounting plate 1, and 4 screws and 4 mounting screw holes 29 are in threaded connection to fixedly connect the linear bearing 2 and the connecting mounting plate 1. The rotation limiting plate 17 (shown in fig. 5) comprises a horizontal section and a vertical section, the two sections form an L-shaped structure, and the horizontal section passes through the connecting hole 31 through the connecting positioning bolt 18 and is in threaded connection with one end of the moving guide rod 4 passing through the connecting mounting plate 1; the vertical section moves linearly along the right-angled groove 27. Wherein, right angle recess 27 plays the spacing effect of circumference, and restriction rotation limiting plate 17 only can be followed right angle recess 27 and made rectilinear movement, can not rotate, avoids the vortex detection device of lower part because of rotating unable and stainless steel seamless nozzle stub 11 cooperation. The rotary limiting plate 17 is fixedly connected with one end of the movable guide rod 4 penetrating through the connecting mounting plate 1 through a connecting positioning bolt 18, and two functions are provided, namely, the rotary limiting plate 17 is used for preventing the lower eddy current detection device from rotating; secondly, play the axial limiting action to the eddy current inspection device of lower part, prevent that lower part eddy current inspection device from breaking away from with connecting mounting panel 1 when downwards.
In one embodiment, the moving guide 4 (shown in fig. 6) includes an upper guide 32, a middle guide 33, and a lower guide 34 coaxially formed from top to bottom, and the middle guide 33 has a larger radius than the upper guide 32 and the lower guide 34. The top of the upper guide rod 32 passes through the linear bearing 2 and the connecting and mounting plate 1 to be fixedly connected with the rotation limiting plate 17. Specifically, the top of the upper-stage guide bar 32 has a positioning screw hole 39, and the connecting positioning bolt 18 is screwed with the positioning screw hole 39 through the connecting hole 31 to fix the moving guide bar 4 and the rotation-restricting plate 17 together. The compression spring 3 is sleeved on the upper-section guide rod 32, the upper end of the compression spring abuts against the flange end cover 40, and the lower end of the compression spring abuts against the upper shoulder 35 of the movable guide rod 4. Wherein, the main function of the compression spring 3 is to provide pressure for keeping the lifting distance between the eddy point type probe 15 and the stainless steel seamless short pipe 11 to be detected. The mounting bracket 5 is provided with a guide rod mounting hole 20, and the lower guide rod 34 is mounted on the guide rod mounting hole 20. The lower shoulder 36 of the mobile guide rod 4 and the mounting bracket 5 play a role in axial positioning. The fastening screw hole 21 is perpendicular to and communicates with the guide bar mounting hole 20. One side of the lower guide rod 34 is reamed to form a reamed plane 38; the set screw 16 passes through the set screw hole 21 and abuts against the spot facing 38, and plays a role in positioning and fixing the movable guide 4 in the circumferential direction, thereby preventing the mounting bracket 5 from rotating.
In one embodiment, the mounting bracket 5 is combined with the removable plate 6, as shown in fig. 10, to collectively provide rotational positioning support for the eddy current spot probe 15. Step holes (meeting the installation and positioning conditions of a rolling bearing) are respectively formed in the symmetrical positions of the detachable plate 6 and the installation support 5 and used for installing the micro self-aligning ball bearing 13. As shown in fig. 11 and 12, a through hole is formed in the center region of the V-block 10; the eddy current point type probe 15 is sleeved with an elastic clamping sleeve 25, the eddy current point type probe 15 and the elastic clamping sleeve 25 are installed in the through hole, and the elastic clamping sleeve 25 is tightly pressed through a set screw 24, so that the eddy current point type probe 15 can be clamped and positioned. Preferably, the resilient clamping sleeve 25 (shown in FIG. 13) is provided with an opening. After the whole probe rotation positioning device (comprising a V-shaped block 10, a rotating shaft 9, a rotating shaft 12, a miniature self-aligning ball bearing 8, a miniature self-aligning ball bearing 13 and a rotation limiting shaft 14) is installed, the installation support 5 and the detachable plate 6 are fixedly connected together through 4 connecting screws 7 and 4 fixing screw holes 46. If the parts in the probe rotary positioning device need to be replaced, the detachable plate 6 and the mounting bracket 5 are separated. The mounting bracket 5 is provided with an arc-shaped slot 23, but not limited to this, the arc-shaped slot 23 functions as: if the centroid of the V-shaped block 10 containing the eddy point type probe 15 deviates from the axis of the movable guide rod 4, the rotation limiting shaft 14 in the arc-shaped groove 23 limits the V-shaped block 10 from over-rotation, so as to ensure that the V-shaped block 10 is accurately matched with the stainless steel seamless short pipe 11 to be detected.
When the outer diameter of the detected stainless steel seamless short pipe 11 changes, two sides of the V-shaped groove 26 are always tangent to the outer wall of the steel pipe, but the lifting distance between the lower end face of the eddy current point type probe 15 and the outer wall of the steel pipe changes, at the moment, the set screw 24 can be loosened, and the set screw 24 is locked after the eddy current point type probe 15 is manually adjusted to a proper position.
In one embodiment, the connection between the mounting bracket 5 and the V-block 10 is by means of tension springs 42, 43 in addition to the rotation shaft 12 and the rotation-limiting shaft 14. The two sides of the mounting bracket 5 and the V-shaped block 10 are respectively provided with a coaxial and horizontally centered fixing screw hole 45; the axes of the four fixing screw holes 45 are positioned on the same vertical central plane; one end of the extension spring 42 is fixed on a fixing screw 44 which is matched with the fixing screw hole 45 and arranged at the left side of the mounting bracket 5, and the other end of the extension spring is fixed on a fixing screw 44 which is matched with the fixing screw hole 45 and arranged at the left side of the V-shaped block 10; one end of the tension spring 43 is fixed on a fixing screw 44 which is matched with the fixing screw hole 45 at the right side of the mounting bracket 5, and the other end is hung on the fixing screw 44 which is matched with the fixing screw hole 45 at the right side of the V-shaped block 10.
The main functions of the extension spring are: in the detection process, under the double actions of external thrust and steel pipe resistance of the V-shaped block, the two V-shaped surfaces are tangent to the surface of the detected steel pipe, the lifting distance of the eddy current point type probe is ensured, and the tension of the tension spring is stretched when being smaller than the external acting force; after the detection is finished, the V-shaped block is separated from the steel pipe to be detected, and at the moment, under the action of the tensile force of the extension spring, the V-shaped block quickly restores to an initial balance state.
The operating principle of the eddy current testing device of one embodiment of the invention is as follows:
before detection, the position of the eddy current point-type probe 15 is adjusted according to the outer diameter of the steel pipe to be detected, and the lifting distance is ensured to be not more than 0.5 mm. After the eddy current detection device is connected with an external driving mechanism through screws, when the stainless steel seamless short pipe 11 enters a detection position, the external driving mechanism pushes the eddy current detection device to move forward, the V-shaped block 10 is in contact with the outer surface of the steel pipe, the detected stainless steel seamless short pipe 11 rotates at a high speed under the action of the external driving mechanism, and the eddy current detection device simultaneously moves at a constant speed along the axis of the steel pipe. At this time, the outer cylindrical surface of the stainless steel seamless short pipe 11 to be measured and the V-shaped block 10 perform relative sliding friction motion. Under the pressure of the compression spring 3, the two bevel edges of the V-shaped groove 26 are always kept tangent to the outer surface of the steel pipe, so that the lifting distance of the eddy point type probe 15 is kept unchanged, as shown in fig. 15. On the other hand, when the axis of the stainless steel seamless short pipe 11 to be detected is not perpendicular to the axis of the movable guide rod 4, the miniature self-aligning ball bearings on the two sides of the V-shaped block 10 automatically adjust the axis direction, so as to ensure that the two oblique sides of the V-shaped groove 26 are in full-width contact with the outer cylindrical surface of the stainless steel seamless short pipe 11, and finally ensure that the lift-off distance of the eddy current point type probe 15 is kept unchanged, thereby avoiding unpredictable detection results caused by the change of the lift-off distance, as shown in fig. 16.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (9)
1. The eddy current detection device for the surface micro-defects of the stainless steel seamless short pipe is characterized by comprising a connecting mounting plate, a movable guide rod, a rotary limiting plate, a compression spring, a mounting bracket, a detachable plate, a V-shaped block, a linear bearing and an eddy current point type probe; the connecting mounting plate is fixedly connected with an external driving mechanism; one end of the movable guide rod penetrates through the connecting mounting plate to be fixedly connected with the rotary limiting plate for limiting the downward movement of the movable guide rod, and the other end of the movable guide rod is fixedly connected with the mounting bracket; the compression spring is sleeved on the movable guide rod and used for applying pressure to enable the rotary limiting plate to abut against the connecting mounting plate; the detachable plate is detachably connected with the mounting bracket; the V-shaped block is rotatably connected with the detachable plate and the mounting bracket; the bottom of the V-shaped block is provided with a V-shaped groove; the eddy current point type probe is positioned in the central area of the V-shaped block and is arranged outwards right opposite to the bottom of the V-shaped groove; the V-shaped groove is used for being clamped on the surface of the detected stainless steel seamless short pipe; the upper part of the linear bearing is of a cylindrical structure, and the lower part of the linear bearing is provided with a flange end cover; the cylinder structure protrudes into the connecting and mounting plate, and the flange end cover is fixedly connected with the connecting and mounting plate; the movable guide rod comprises an upper guide rod, a middle guide rod and a lower guide rod which are coaxially formed from top to bottom, and the radius of the middle guide rod is larger than that of the upper guide rod and that of the lower guide rod; the top of the upper section guide rod sequentially penetrates through the cylindrical structure and the connecting mounting plate to be fixedly connected with the rotary limiting plate; the compression spring is sleeved on the upper section guide rod, the upper end of the compression spring is abutted against the flange end cover, and the lower end of the compression spring is abutted against the upper shaft shoulder of the middle section guide rod; the mounting bracket is provided with a guide rod mounting hole, and the lower section guide rod is mounted on the guide rod mounting hole; and the lower shaft shoulder of the middle guide rod is axially positioned with the mounting bracket.
2. The eddy current inspection device for micro defects on the surface of a stainless steel seamless short pipe according to claim 1, wherein a fastening screw hole is perpendicular to and communicated with the guide rod mounting hole; one side of the lower section guide rod is flattened, and a fastening screw is used for fixing the lower section guide rod through the fastening screw hole.
3. The eddy current testing device for the surface micro defects of the stainless steel seamless short pipe according to claim 1, wherein the rotation limiting plate comprises a horizontal section and a vertical section which form an L-shaped structure; the horizontal section is in threaded connection with the top of the upper section guide rod through a connecting and positioning bolt, and the vertical section moves linearly along the right-angle groove in the connecting and mounting plate and cannot rotate.
4. The eddy current inspection device for the surface micro defects of the stainless steel seamless short pipe according to any one of claims 1 to 3, wherein step holes are respectively formed in symmetrical positions of the detachable plate and the mounting bracket, micro self-aligning ball bearings are mounted on the step holes, and two sides of the V-shaped block are respectively connected with the micro self-aligning ball bearings on two sides through rotating shafts.
5. The eddy current inspection device for the surface micro-defects of the stainless steel seamless short pipe according to claim 4, wherein an arc-shaped groove is formed on the mounting bracket or the detachable plate, a rotation limiting shaft is arranged on one corresponding side of the V-shaped block, and the rotation limiting shaft is matched with the arc-shaped groove to limit the V-shaped block from over-rotating.
6. The eddy current testing device for the surface micro-defects of the stainless steel seamless short pipe according to claim 5, wherein two extension springs are connected between the mounting bracket and the V-shaped block; the two extension springs are used for enabling the V-shaped block to return to an initial balance state.
7. The eddy current testing apparatus for the surface micro-defects of the stainless steel seamless short pipe according to claim 6, wherein the extension spring is a coil spring with hooks.
8. The eddy current testing device for the surface micro-defects of the stainless steel seamless short pipe according to claim 1, wherein a through hole is formed in the center area of the V-shaped block; and the eddy current point type probe is sleeved with an elastic clamping sleeve, the eddy current point type probe and the elastic clamping sleeve are arranged in the through hole, and the elastic clamping sleeve is tightly propped against the elastic clamping sleeve through a set screw.
9. The eddy current inspection device for micro defects on the surface of a stainless steel seamless short pipe according to claim 8, wherein the elastic clamping sleeve is provided with an opening.
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| CN201810613801.3A CN108828061B (en) | 2018-06-14 | 2018-06-14 | Eddy current detection device for surface micro-defects of stainless steel seamless short pipe |
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| CN201810613801.3A CN108828061B (en) | 2018-06-14 | 2018-06-14 | Eddy current detection device for surface micro-defects of stainless steel seamless short pipe |
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| CN108828061B true CN108828061B (en) | 2022-05-27 |
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| CN111024810B (en) * | 2019-11-08 | 2022-10-14 | 上海应用技术大学 | Eddy current detection device capable of simultaneously detecting defects of inner wall and outer wall of stainless steel short pipe |
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