Eddy current probe and manufacturing method thereof

Abstract

The invention relates to the technical field of detection instrument preparation, and discloses an eddy current probe and a manufacturing method thereof.The manufacturing method comprises the steps that a tool is matched with an adjusting threaded groove, the circumferential angle of a protection cover relative to a metal shell is adjusted, and after adjustment is in place, the tool is matched with a positioning groove; the position of the protective cover relative to the metal shell is locked in the circumferential direction, and at the moment, the locking external threads of the protective cover and the locking internal threads of the metal shell are in threaded fit, and the locking external threads and the locking internal threads lock the position of the protective cover relative to the metal shell in the radial direction. And when the protective cover and the metal shell are moved to a fixing station to be fixed or fixed on site, even if the protective cover and the metal shell are subjected to external force, the protective cover and the metal shell cannot move relatively, so that the relative positions of the protective cover and the metal shell in a final eddy current probe finished product cannot deviate, and the working efficiency is improved. Therefore, the eddy current probe finished product can meet the requirements, and the eddy current probe finished product can keep high enough detection precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection instrument manufacturing, in particular to an eddy current probe and a manufacturing method thereof. BACKGROUND

[0002] The eddy current probe is used for reliable and safe detection of important state parameter variables such as displacement, vibration, rotation speed, expansion difference and eccentricity of a key shafting part of a large equipment in long-term high-speed operation.

[0003] In the manufacturing process of the eddy current probe, the protective cover and the metal shell need to be matched at a predetermined peripheral angle. In the existing eddy current probe, an outer thread is formed on the outer wall of the protective cover, and a locking inner thread is formed on the inner wall of the metal shell. The peripheral angle of the protective cover relative to the metal shell is adjusted by manually screwing the protective cover. After the adjustment is completed, the protective cover and the metal shell are moved to a glue injection station for glue injection and fixation. During the movement before the glue injection, the protective cover and the metal shell will be offset in the circumferential direction under the action of external force, resulting in a deviation between the relative position of the glued protective cover and the metal shell and the adjusted position, which causes the detection accuracy of the formed eddy current probe product to decrease, and even cannot meet the product requirements. SUMMARY

[0004] The purpose of the present application is to overcome the low adjustment efficiency of the peripheral angle between the protective cover and the metal shell in the prior art, and to provide an eddy current probe and a manufacturing method thereof. The manufacturing method of the eddy current probe has the function of improving the adjustment efficiency of the relative peripheral angle between the protective cover and the metal shell.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a manufacturing method of an eddy current probe, comprising the following steps: forming an adjustment thread groove and a locking outer thread arranged in the axial direction on the outer wall of the protective cover, and forming a plurality of positioning grooves extending in the axial direction and communicating with the adjustment thread groove; the plurality of positioning grooves are distributed in the circumferential direction of the protective cover; forming a locking inner thread on the inner wall of the metal shell for thread cooperation with the locking outer thread; inserting part of the protective cover into the metal shell along the end where the locking outer thread is located, so that the protective cover is located at a predetermined position; inserting a tool into the adjustment thread groove while rotating the protective cover, so that the protective cover is driven to rotate and move axially relative to the metal shell under the cooperation of the tool and the adjustment thread groove, until the peripheral angle of the protective cover relative to the metal shell is the same as the predetermined peripheral angle; locking the position of the protective cover at this time through the cooperation of the positioning groove and the tool; fixing the protective cover and the metal shell.

[0006] In some embodiments, the method further comprises the step of forming a protrusion between every two positioning grooves; preferably, the method further comprises the steps of forming a dovetail groove on the protrusion of the adjustment thread groove; and / or forming a sharp corner groove at the end of at least one end of the positioning groove.

[0007] In some embodiments, the method further comprises the steps of: forming a glue injection long hole on the metal shell, which is communicated with the adjusting thread groove, and forming an included angle between the extending direction of the glue injection long hole and the extending direction of the adjusting thread groove; preferably, the step of fixing the protective cover to the metal shell specifically comprises: pouring injection glue into the glue injection long hole, the adjusting thread groove and the positioning groove, so as to glue the protective cover to the metal shell.

[0008] In some embodiments, the method further comprises the steps of: sleeving the fixing cover to the outer periphery of the cable assembly; sleeving the reinforcing copper pipe to the outer periphery of the cable assembly; sleeving the protective cover to the outer periphery of the fixing cover and the reinforcing copper pipe; preferably, the method further comprises the steps of: forming a plurality of first fastening grooves extending in the circumferential direction on the outer wall of the fixing cover along the axial direction, pouring injection glue between the protective cover and the fixing cover and into the first fastening grooves, so as to glue the protective cover to the fixing cover; and / or forming a plurality of second fastening grooves extending in the circumferential direction on the outer wall of the reinforcing copper pipe along the axial direction, pouring injection glue between the protective cover and the reinforcing copper pipe and into the second fastening grooves, so as to glue the protective cover to the reinforcing copper pipe.

[0009] The second aspect of the present application provides an eddy current probe, comprising: a protective cover and a metal shell sleeved to the outer periphery of the protective cover, the outer wall of the protective cover is spaced apart along the axial direction to form an adjusting thread groove and a locking external thread, and a plurality of positioning grooves extending in the axial direction and communicated with the adjusting thread groove, the plurality of positioning grooves are distributed in the circumferential direction of the protective cover, and the inner wall of the metal shell is formed with a locking internal thread threadedly matched with the locking external thread.

[0010] In some embodiments, the eddy current probe is obtained by using the manufacturing method of the eddy current probe described above.

[0011] In some embodiments, a protruding platform is formed between every two positioning grooves, and the protective cover and the metal shell are fixedly connected by injecting injection glue into the positioning grooves and the adjusting thread groove.

[0012] In some embodiments, the adjusting thread groove is formed as a dovetail groove at the protruding platform; and / or the end of at least one end of the positioning groove is formed as a sharp corner groove.

[0013] In some embodiments, a glue injection long hole communicated with the adjusting thread groove is formed on the metal shell, and the extending direction of the glue injection long hole and the extending direction of the adjusting thread groove form an included angle, and the protective cover and the metal shell are further fixedly connected by injecting injection glue into the glue injection long hole; preferably, a plurality of glue injection long holes are formed on the metal shell, the plurality of glue injection long holes are distributed in the circumferential direction of the metal shell, and the extending directions of at least two glue injection long holes form an included angle to form different angles with the extending direction of the adjusting thread groove.

[0014] In some embodiments, the eddy current probe further comprises a cable assembly and a fixing cover fixedly sleeved on the outer periphery of the cable assembly, the outer wall of the fixing cover is provided with a first fastening groove along the circumferential direction for filling with injection glue, and the cable assembly and the fixing cover are fixedly connected through the injection glue injected into the first fastening groove; preferably, the fixing cover is provided with a plurality of first fastening grooves distributed along the axial direction; more preferably, the first fastening groove is an open ring groove provided along the circumferential direction of the fixing cover to form a reinforcing rib extending along the axial direction on the outer wall of the fixing cover; and / or the eddy current probe further comprises a reinforcing copper pipe sleeved on the outer periphery of the cable assembly and arranged in the protective cover, the reinforcing copper pipe is provided with a second fastening groove along the circumferential direction for filling with injection glue, and the cable assembly and the reinforcing copper pipe are fixedly connected through the injection glue injected into the second fastening groove; preferably, the reinforcing copper pipe is provided with a plurality of second fastening grooves distributed along the axial direction.

[0015] Through the above technical solution, the adjusting screw groove is inserted by an external tool such as a mechanical hand, the protective cover is rotated, the circumferential angle of the protective cover relative to the metal shell is adjusted, after being adjusted in place, the position of the protective cover relative to the metal shell is locked in the circumferential direction through the cooperation of the tool and the positioning groove, and at this time, the locking outer thread of the protective cover and the locking inner thread of the metal shell have been threadedly cooperated, the position of the protective cover relative to the metal shell is locked in the radial direction, and then when the protective cover and the metal shell are moved to the fixing station for fixing or fixed in place, even if the protective cover and the metal shell are subjected to external force, they cannot move relative to each other, which can ensure that the relative position of the protective cover and the metal shell in the final eddy current probe product cannot be deviated, thereby ensuring that the eddy current probe product can meet the requirements and making the eddy current probe product can maintain high detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is an explosion schematic diagram of the eddy current probe of the present application;

[0017] Figure 2 is a longitudinal sectional view of the eddy current probe;

[0018] Figure 3 is Figure 2 structure schematic diagram from another angle;

[0019] Figure 4 is a structure schematic diagram of the eddy current probe;

[0020] Figure 5 is a structure schematic diagram of the eddy current probe except the cover;

[0021] Figure 6 is a structure schematic diagram of the eddy current probe except the cover and the metal shell;

[0022] Figure 7is a structural schematic diagram of a cable assembly, a fixing cover and a reinforced copper pipe of an eddy current probe;

[0023] Figure 8 is a structural schematic diagram of a cable assembly of an eddy current probe;

[0024] Figure 9 is a structural schematic diagram of a cable assembly;

[0025] Figure 10 is a structural schematic diagram of a fixing cover of an eddy current probe;

[0026] Figure 11 is a structural schematic diagram of a protective cover of an eddy current probe;

[0027] Figure 12 is Figure 11 is a structural schematic diagram of another angle;

[0028] Figure 13 is a structural schematic diagram of a metal shell of an eddy current probe;

[0029] Figure 14 is Figure 13 is a structural schematic diagram of another angle; and

[0030] Figure 15 is a structural schematic diagram of a reinforced copper pipe of an eddy current probe.

[0031] Explanation of reference signs

[0032] 10, cable assembly; 11, coil; 12, cable; 13, core wire; 14, inner shielding layer; 15, insulation layer; 16, large copper pipe; 17, small copper pipe; 18, isolation ring; 19, outer shielding layer; 20, fixing cover; 21, first fastening groove; 22, reinforcing rib; 23, protruding head; 24, limiting section; 25, connecting section; 30, protective cover; 31, adjusting screw groove; 32, locking external thread; 33, positioning groove; 34, first mounting groove; 35, first sealing ring; 40, metal shell; 41, glue injection long hole; 42, second mounting groove; 43, second sealing ring; 44, mounting external thread; 50, reinforced copper pipe; 51, second fastening groove; 60, cover. DETAILED DESCRIPTION

[0033] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0034] Referring to Figures 1 to 15 The present application provides a manufacturing method of an eddy current probe, comprising the following steps:

[0035] SA1: The adjusting screw grooves 31 and the locking external threads 32 are formed on the outer wall of the protective cover 30 in the axial direction, and a plurality of positioning grooves 33 extending in the axial direction and cross-communicating with the adjusting screw grooves 31 are formed on the outer wall of the protective cover 30, so that the plurality of positioning grooves 33 are distributed along the circumferential direction of the protective cover 30;

[0036] SA2: The locking internal threads for threadedly cooperating with the locking external threads 32 are formed on the inner wall of the metal shell 40;

[0037] SA3: The protective cover 30 is inserted into the metal shell 40 along the end where the locking external threads 32 are located, so that the protective cover 30 is located at a predetermined position;

[0038] SA4: A tool is inserted into the adjusting screw groove 31, and the protective cover 30 is rotated, so that the protective cover 30 is driven to rotate and move in the axial direction relative to the metal shell 40 under the cooperation of the tool and the adjusting screw groove 31, until the circumferential angle of the protective cover 30 relative to the metal shell 40 is the same as a predetermined circumferential angle;

[0039] SA5: The position of the protective cover 30 at this time is locked through the cooperation of the positioning groove 33 and the tool;

[0040] SA6: The protective cover 30 and the metal shell 40 are fixed.

[0041] In the manufacturing process of the eddy current probe, the relative circumferential angle between the protective cover 30 and the metal shell 40 needs to be determined by the data displayed by the instrument after the protective cover 30 is partially inserted into the metal shell 40, to determine whether the relative circumferential angle between the protective cover 30 and the metal shell 40 is adjusted to the position. After the relative circumferential position of the protective cover 30 and the metal shell 40 is adjusted to the position, the protective cover 30 and the metal shell 40 are locked at the position through the cooperation of the positioning groove 33 and the tool, and the relative circumferential position of the protective cover 30 and the metal shell 40 is locked at this time. At this time, the locking external threads 32 of the protective cover 30 and the locking internal threads of the metal shell 40 have formed a threaded connection, and the radial locking of the protective cover 30 relative to the metal shell 40 is formed. Then, the protective cover 30 and the metal shell 40 are moved to a fixing station for fixing, or the protective cover 30 and the metal shell 40 are fixed by using a fixing tool. Even if the protective cover 30 and the metal shell 40 are subjected to external force, the cooperation of the positioning groove 33 and the tool and the cooperation of the locking external threads 32 and the locking internal threads also make the protective cover 30 and the metal shell 40 fixed in the circumferential direction and the radial direction, and unable to move. In this way, it can be ensured that the relative position of the protective cover 30 and the metal shell 40 in the final eddy current probe product will not be deviated, and the eddy current probe product can meet the requirements and maintain a high detection accuracy.

[0042] In addition, the adjustment screw groove 31 and the tool are matched to play a guiding role, so as to ensure the rotation stability of the protective cover 30 during the adjustment process.

[0043] Specifically, the tool can be a mechanical hand, which includes a fixed block for inserting into the adjustment screw groove 31 and a sleeve for rotating the protective cover 30. After the fixed block is inserted into the adjustment screw groove 31, the fixed block is fixed relative to the metal shell 40. The sleeve is fixed to the end of the end of the adjustment screw groove 31 of the protective cover 30, and the sleeve is rotated to drive the protective cover 30 to rotate circumferentially. After step SA4, the fixed block of the mechanical hand is located on the same straight line as the positioning groove 33, and the fixed block of the mechanical hand can be slightly moved axially to be separated from the adjustment screw groove 31 and enter the positioning groove 33. In this way, the protective cover 30 can be locked relative to the metal shell 40 in the circumferential direction. The positioning grooves 33 are uniformly and spacedly distributed on the full circumference of the protective cover 30, and the distance between every two positioning grooves 33 forms an adjustment gear of the adjustment screw groove 31. According to the requirements of different eddy current probes, the distance between the positioning grooves 33 is set.

[0044] Specifically, the pitch of the locking external thread 32 is 0.5 mm. After step SA3, the locking external thread 32 of the protective cover 30 and the locking internal thread of the metal shell 40 can be preliminarily connected or not connected, and only need to be rotated to a predetermined position. After step SA4, the locking external thread 32 of the protective cover 30 and the locking internal thread of the metal shell 40 are threadedly connected. In steps SA3 to SA5, the metal shell 40 is always fixed by an external clamp. The predetermined position in step SA3 is a reference position, the linear range is 2 mm, and the corresponding voltage variation is -0.6 VDC to -23 VDC. The predetermined circumferential angle position in step SA4 is a standard position, the linear range is 2 mm, and the corresponding voltage variation is -2.0 VDC to -18.0 VDC ~ -17.74 VDC. That is, when the eddy current probe approaches the measured body, the voltage is -2 VDC, and when the eddy current probe is 2 mm away from the measured body, the voltage is -18.0 VDC ~ -17.74 VDC. The sensitivity is equal to the voltage variation divided by the change of the axial displacement of the protective cover 30, that is, 7.87 v / mm ~ 8 v / mm. In step SA2, an installation external thread 44 is formed on the outer wall of the metal shell 40, which is used by the user to assemble and use the eddy current probe.

[0045] In other embodiments, step SA3 can be replaced by rotating the metal shell 40 from the end of the locking external thread 32 of the protective cover 30 to the partial outer circumference of the protective cover 30. In step SA5, the protective cover 30 is axially pushed, which can be replaced by axially pushing the metal shell 40.

[0046] Referring to Figures 1 to 15As shown, in some embodiments, step SA1 further includes forming a protruding platform between every two positioning grooves 33.

[0047] In the present embodiment, a stepped structure is formed between the protruding platform and the groove bottom of the positioning groove 33. When the protective cover 30 is rotated to the position where the fixing block of the mechanical hand moves into the positioning groove 33, the fixing block of the mechanical hand moves in the radial direction of the protective cover 30 and is clamped into the groove bottom of the positioning groove 33, at which time the mechanical hand is locked in the circumferential direction of the protective cover 30. In this locking mode, the adjustment time can be reduced instead of slightly moving the fixing block of the mechanical hand in the axial direction.

[0048] In addition, when the data display of the instrument lags, the protective cover 30 can be first rotated to the position where the fixing block of the mechanical hand is located in one positioning groove 33 to achieve circumferential locking. After the data displayed in the instrument is stable, it is determined whether the circumferential angle of the protective cover 30 relative to the metal shell 40 meets the requirements, so as to avoid excessive adjustment due to the lag of the data displayed by the instrument during the rotation of the protective cover 30, and thus avoid affecting the adjustment efficiency and ensuring the adjustment accuracy.

[0049] Referring to Figures 1 to 15 As shown, in some embodiments, step SA1 further includes forming a dovetail groove on the protruding platform.

[0050] In the present embodiment, the dovetail groove is provided to limit the radial position of the fixing block of the mechanical hand, i.e., to lock the fixing block of the mechanical hand in the radial direction, so as to avoid radial drift of the mechanical hand relative to the protective cover 30 during the adjustment process of the protective cover 30. The groove bottom of the dovetail groove protrudes from the groove bottom of the positioning groove 33 in the radial direction of the protective cover 30.

[0051] Specifically, the fixing block of the mechanical hand is adapted to the dovetail groove.

[0052] Referring to Figures 1 to 15 As shown, in some embodiments, step SA1 further includes forming a sharp corner groove at at least one end of the positioning groove 33.

[0053] Specifically, both ends of the positioning groove 33 are sharp corner grooves.

[0054] Referring to Figures 1 to 15 As shown, in some embodiments, step SA2 further includes forming a glue injection long hole 41 on the metal shell 40, which is communicated with the adjustment screw groove 31, and forming an included angle between the extension direction of the glue injection long hole 41 and the extension direction of the adjustment screw groove 31.

[0055] In the present embodiment, after the protective cover 30 is located in the metal shell 40, the glue injection long hole 41 and the adjustment screw groove 31 are located at the same radial position, at which time the injection glue can be poured from the glue injection long hole 41 into the metal shell 40 and the protective cover 30 to fix the two.

[0056] Specifically, the elongated injection hole 41 is formed as a curved waist hole. In step SA2, a plurality of elongated injection holes 41 are formed on the metal housing 40 at uniform intervals along the entire circumference. There is an angle between the extension directions of every two adjacent elongated injection holes 41, so that adjacent elongated injection holes 41 form different angles with the adjusting thread groove 31.

[0057] See Figures 1 to 15 As shown, in some embodiments, the step of fixing the protective cover 30 and the metal housing 40 in step SA6 specifically includes: injecting injection molding compound into the injection hole 41, the adjusting thread groove 31 and the positioning groove 33 to glue the protective cover 30 and the metal housing 40 together.

[0058] In this embodiment, the injection molding compound will solidify in the injection elongated hole 41, the adjusting thread groove 31, and the positioning groove 33. On the one hand, the angle formed between the extension direction of the elongated injection hole 41 and the extension direction of the adjusting thread groove 31 causes the injection molding compound to solidify into an "X" or "+" shaped snap, which strengthens the impact resistance of the eddy current probe head and makes the protective cover 30 and the metal housing 40 more firmly fixed, preventing loosening after long-term use, reducing the deformation of the eddy current probe in working environments with large temperature differences, maintaining its original size, and thus ensuring the stability and consistency of the detection data during the use of the eddy current probe. On the other hand, the dovetail groove formed by the adjusting thread groove 31 can form an inverted trapezoidal fixing snap, which, compared to the inverted triangular groove, can lock in the radial direction of the protective cover 30 and make the protective cover 30 and the metal housing 40 more firmly fixed in the radial direction and less prone to loosening, thus being able to withstand stronger impact forces. Furthermore, the pointed grooves at both ends of the positioning groove 33 can ensure that the injection molding compound fills the entire fixing groove without gaps, making the protective cover 30 and the metal housing 40 more firmly fixed. In addition, adjusting the settings of the threaded groove 31 and the positioning groove 33 allows more injection molding compound to be injected between the protective cover 30 and the metal housing 40, increasing the connection strength between the two. When the eddy current probe operates for a long time in an environment with high temperature, large amount of oil, and frequent vibration, it can prevent the protective cover 30 from separating from the metal housing 40 and ensure that the gap between the protective cover 30 and the metal housing 40 is sealed, preventing the penetration of external oil, strong acid and strong alkali substances, protecting the coil 11 to the greatest extent, and ensuring the long-term reliable use of the eddy current probe.

[0059] See Figures 1 to 15 As shown, in some embodiments, steps SA2 and SA3 may further include:

[0060] SB1: Fit the retaining cover 20 onto the outer periphery of the cable assembly 10;

[0061] SB2: Install 50 sets of reinforcing copper pipes around the outer perimeter of cable assembly 10;

[0062] SB3: The protective cover 30 is sleeved to the fixed cover 20 and the outer periphery of the reinforced copper pipe 50.

[0063] In the embodiment, the protective cover 30 for cooperating with the metal shell 40 in step SA3 is a combined component formed through steps SB1 to SB3. The fixed cover 20 is used to fix the loose cable assembly 10 as a whole, avoiding the components in the cable assembly 10 from falling off or being displaced during use. Figures 8 to 6 SB1 to SB3.

[0064] Specifically, the reinforced copper pipe 50 is a notched structure, which can be opened and buckled and compressed on the outer periphery of the cable assembly 10 through the notches, or can be first sleeved to the outer periphery of the cable assembly 10 and then compressed.

[0065] In other embodiments, the protective cover 30 can be first operated through steps SA1 to SA6 and then operated through SB1 to SB3, and the order of each operation step can be not limited, so as to finally form an eddy current probe product.

[0066] Referring to Figures 1 to 15 In some embodiments, before the step of sleeving the fixed cover 20 to the outer periphery of the cable assembly 10 in step SB1, a plurality of first fastening grooves 21 extending in the circumferential direction are formed on the outer wall of the fixed cover 20 along the axial direction; and before the step of sleeving the reinforced copper pipe 50 to the outer periphery of the cable assembly 10 in step SB2, a plurality of second fastening grooves 51 extending in the circumferential direction are formed on the outer wall of the reinforced copper pipe 50 along the axial direction.

[0067] In the embodiment, the reinforced copper pipe 50 is used for positioning, providing positioning for the installation of the protective cover 30, and the end sleeved with the locking external thread 32 of the protective cover 30 is sleeved on the outer periphery of the reinforced copper pipe 50. In addition, the reinforced copper pipe 50 is also used to connect the fixed cover 20 and the protective cover 30, so that the connection of the protective cover 30, the fixed cover 20 and the cable assembly 10 is more firm.

[0068] Specifically, the first fastening grooves 21 are formed as open-loop grooves extending in the circumferential direction of the fixed cover 20, and the reinforcing ribs 22 extending in the axial direction are formed on the outer wall of the fixed cover 20, so that the outer wall of the fixed cover 20 forms a "vertebral body" type structure, and the plurality of first fastening grooves 21 are uniformly and spacedly distributed along the full axial direction of the fixed cover 20. The plurality of second fastening grooves 51 are uniformly and spacedly distributed along the full axial direction of the reinforced copper pipe 50.

[0069] Referring to Figures 1 to 15As shown, in some embodiments, after step SB3, the method further comprises: pouring the injection glue into the space between the protective cover 30 and the fixing cover 20, into the first fastening groove 21, into the space between the protective cover 30 and the reinforced copper pipe 50, and into the second fastening groove 51, so as to glue the protective cover 30 and the reinforced copper pipe 50 together.

[0070] In the present embodiment, the injection glue flows into the first fastening groove 21 and the second fastening groove 51 and solidifies, forming an integral part of the injection glue that flows into and solidifies between the protective cover 30 and the fixing cover 20 and between the protective cover 30 and the reinforced copper pipe 50, increasing the amount of injection glue between the protective cover 30 and the fixing cover 20 and the reinforced copper pipe 50, thereby increasing the glueing area and further increasing the firmness of the fixing of the protective cover 30 and the fixing cover 20 and the reinforced copper pipe 50, avoiding the fixing cover 20 and the protective cover 30 from sliding relative to each other in the circumferential direction and the axial direction, ensuring the structural stability and ensuring that the components inside the eddy current probe do not shift in a high-temperature working environment. In addition, the "vertebrae" type structure formed by the first fastening groove 21 can increase the impact resistance after the injection glue is injected and solidified, and can avoid loosening and delamination.

[0071] Referring to Figures 1 to 15 As shown, in some embodiments, the forming step of the cable assembly 10 in step SB1 comprises:

[0072] SC1: stripping the outer sheath and the outer shield layer 19 of the cable 12 to expose the inner shield layer 14, the insulating layer 15 and the core wire 13 to form a piece of wire assembly, and then stripping the inner shield layer 14 and the insulating layer 15 of part of the piece of wire assembly to expose the core wire 13 to form a piece of core wire 13;

[0073] SC2: placing the first end of the coil 11 on the outer wall of the piece of wire assembly, sleeving the large copper pipe 16 on the outer periphery of the piece of wire assembly and the first end of the coil 11, and pressing the first end of the coil 11 between the piece of wire assembly and the large copper pipe 16;

[0074] SC3: sleeving the isolation ring 18 on part of the outer periphery of the piece of core wire 13;

[0075] SC4: placing the second end of the coil 11 on the outer wall of the piece of core wire 13, sleeving the small copper pipe 17 on the outer periphery of the piece of core wire 13 and the second end of the coil 11, and pressing the second end of the coil 11 between the piece of core wire 13 and the small copper pipe 17, at this time the isolation ring 18 is located between the large copper pipe 16 and the small copper pipe 17 in the axial direction of the core wire 13.

[0076] In the embodiment, the fixing of the coil 11 and the section of wire group is achieved by the pressing of the large copper tube 16, and the fixing of the coil 11 and the section of core wire 13 is achieved by the pressing of the small copper tube 17. In the prior art, the coil 11 is not provided with the large copper tube 16 and the small copper tube 17, and the coil 11 needs to be welded with the section of wire group and the section of core wire 13. In a high-temperature and vibrating working environment, the welding points are prone to be separated or loose. Compared with such a mode, the present method can increase the firmness of the connection between the coil 11 and the section of wire group and the section of core wire 13 by the cooperation of the large copper tube 16 and the small copper tube 17 and the setting of the pressing process, and ensure reliable connection for a long time. The isolation ring 18 is made of high-temperature-resistant insulating material and is used to ensure that the cable assembly 10 is connected compactly and firmly. Since the inner shielding layer 14 is made of metal wire and is easy to produce metal wire heads of different lengths, the isolation ring 18 is also used to avoid the end of the small copper tube 17 contacting the inner shielding layer 14, thereby avoiding the short circuit caused thereby. In addition, the outer shielding layer 19 is also made of metal wire, and the fixing cover 20 is used to limit the inner shielding layer 14 and the outer shielding layer 19 to a fixed structure, so as to avoid the loosening of the metal wires of the inner shielding layer 14 and the outer shielding layer 19. The reinforcing copper tube 50 is used to press and fix the outer shielding layer 19, limit the structure of the outer shielding layer 19, ensure that the metal wires of the outer shielding layer 19 are tightly buckled, cooperate with the fixing cover 20, ensure the size uniformity of the outer shielding layer 19 in the entire axial direction, and the reinforcing copper tube 50 is located between the fixing cover 20 and the outer skin of the cable 12, thereby increasing the sealing performance of the outer skin of the cable 12 at the peeling fault.

[0077] Specifically, after the fixing cover 20 is sleeved to the outer periphery of the cable assembly 10 in step SB1, the coil 11 is located outside the fixing cover 20 except for the two ends of the coil 11. The cable 12 is a double-shielded coaxial cable 12, that is, the cable 12 includes the outer shielding layer 19 and the inner shielding layer 14. The coil 11 is an alloy coil 11. The large copper tube 16 and the small copper tube 17 are both made of brass.

[0078] Specifically, due to the influence of the slight differences in the materials, tension, size, etc. of each coil 11 and each cable 12, the electrical parameters inside the eddy current probe cannot be uniform, and therefore each eddy current probe needs to be calibrated. A large amount of experience data obtained through long-term research is summarized, the commonly used segmented adjustment distance of the protective cover 30 is summarized into a series of fixed values within the permitted range, the distance between each two positioning grooves 33 is determined according to the fixed values, the adjustment gears are formed by the positioning grooves 33, so as to realize precise adjustment and improve the adjustment efficiency.

[0079] Referring to Figures 1 to 15As shown, in some embodiments, step SA1 further comprises: forming a first mounting groove 34 extending in the circumferential direction on the outer wall of the protective cover 30, and fixing a first sealing ring 35 in the first mounting groove 34; and step SA2 further comprises: forming a second mounting groove 42 extending in the circumferential direction on the outer wall of the metal shell 40, and fixing a second sealing ring 43 in the second mounting groove 42; and between steps SB3 and SA1, further comprising: sleeving the sleeve cover 60 to the coil 11, the one end of the fixing cover 20, and the one end of the protective cover 30 outside, so that the coil 11 except for the two ends, the one end of the fixing cover 20, the one end of the protective cover 30, and the first sealing ring 35 are all located inside the sleeve cover 60.

[0080] In the present embodiment, the first sealing ring 35 is used to form a seal between the protective cover 30 and the metal shell 40. The inner wall of the sleeve cover 60 is attached to the outer wall of the coil 11 to define the position of the coil 11, so as to avoid displacement change of the coil 11. The sleeve cover 60 is also used to increase the connection strength between the coil 11 and the fixing cover 20.

[0081] Specifically, after step SA6, the one end of the metal shell 40 and the second sealing ring 43 are also located inside the sleeve cover 60, and the second sealing ring 43 is used to form a seal between the metal shell 40 and the sleeve cover 60. The one end of the fixing cover 20 and the one end of the protective cover 30 are both one end in the same direction, for example, both located at the front end.

[0082] Specifically, all the injection molding glue in the above method is PPS with a temperature resistance of 450℃, which is injected at 400℃, so as to avoid damage of the eddy current probe in a high-temperature working environment and improve the service life of the eddy current probe in the high-temperature working environment. All the injection molding glue is injected by an automatic injection molding machine, so as to shorten the manufacturing time of the eddy current probe. According to experiments, the manufacturing time can be shortened from one month to three days according to the production of one thousand eddy current probes.

[0083] The present application also provides an eddy current probe, comprising: a protective cover 30 and a metal shell 40 sleeved outside the protective cover 30, an outer wall of the protective cover 30 is spaced apart in the axial direction to form an adjusting screw groove 31, a locking outer thread 32, and a plurality of positioning grooves 33 extending in the axial direction and intersecting with the adjusting screw groove 31, the plurality of positioning grooves 33 are spaced apart in the circumferential direction of the protective cover 30, and an inner wall of the metal shell 40 is formed with a locking inner thread threadedly matched with the locking outer thread 32.

[0084] The present embodiment has the same technical effects as steps SA1 to SA6 of the above method, which will not be described here.

[0085] Referring to Figures 1 to 15 As shown, in some embodiments, the eddy current probe is obtained by using the above method for manufacturing the eddy current probe.

[0086] In the embodiment, the eddy current probe has all the technical effects of the above method, which will not be repeated here. In addition to the above effects, the temperature drift performance of the eddy current probe is reduced, and the full-sealed non-oxidized forming is adopted. Through experiments, the service life of the eddy current probe is increased from the traditional three years to more than fifteen years.

[0087] Referring to Figures 1 to 15 As shown in the figure, in some embodiments, a protruding platform is formed between every two positioning grooves 33.

[0088] The embodiment has the same technical effects as step SA1 of the above method, which will not be repeated here.

[0089] Referring to Figures 1 to 15 As shown in the figure, in some embodiments, the adjusting threaded groove 31 is formed as a dovetail groove at the protruding platform. The groove bottom of the dovetail groove protrudes radially from the groove bottom of the positioning groove 33.

[0090] The embodiment has the same technical effects as steps SA1 and SA6 of the above method, which will not be repeated here.

[0091] Referring to Figures 1 to 15 As shown in the figure, in some embodiments, the end of at least one end of the positioning groove 33 is formed as a sharp corner groove.

[0092] Specifically, the ends of both ends of the positioning groove 33 are formed as sharp corner grooves.

[0093] The embodiment has the same technical effects as steps SA1 and SA6 of the above method, which will not be repeated here.

[0094] Referring to Figures 1 to 15 As shown in the figure, in some embodiments, the metal shell 40 is provided with a glue injection long hole 41 communicated with the adjusting threaded groove 31, and the extension direction of the glue injection long hole 41 and the extension direction of the adjusting threaded groove 31 have an included angle.

[0095] The embodiment has the same technical effects as steps SA2 and SA6 of the above method, which will not be repeated here.

[0096] Referring to Figures 1 to 15 As shown in the figure, in some embodiments, the metal shell 40 is provided with a plurality of glue injection long holes 41, the plurality of glue injection long holes 41 are distributed along the circumference of the metal shell 40, and the extension directions of at least two glue injection long holes 41 have an included angle to form different angles with the extension direction of the adjusting threaded groove 31.

[0097] The embodiment has the same technical effects as steps SA2 and SA6 of the above method, which will not be repeated here.

[0098] Referring to Figures 1 to 15As shown, in some embodiments, the eddy current probe further comprises a cable assembly 10 and a fixing cover 20 fixedly sleeved on a part of the outer periphery of the cable assembly 10, and a first fastening groove 21 for filling with injection molding glue is formed on the outer wall of the fixing cover 20 in the circumferential direction. A plurality of first fastening grooves 21 are formed on the fixing cover 20 and are distributed in the axial direction. The first fastening groove 21 is an open ring groove formed in the circumferential direction of the fixing cover 20, so as to form a reinforcing rib 22 extending in the axial direction on the outer wall of the fixing cover 20.

[0099] The present embodiment has the same technical effects as the steps SB1 before and SB3 after the above method, which will not be described here.

[0100] Specifically, the fixing cover 20 comprises a cylindrical protruding head 23, a limiting section 24 and a connecting section 25, the diameters of the three sections are arranged in descending order; the protruding head 23 is inserted into the inside of the coil 11, and the outer wall of the protruding head 23 can be attached to the inner wall of the coil 11 to limit the size and shape of the coil 11; the diameter of the limiting section 24 is greater than or equal to the outer diameter of the coil 11 to limit the axial position of the limiting section 24; the first fastening groove 21 is formed on the outer wall of the connecting section 25. The protruding head 23, the limiting section 24 and the cover 60 cooperate together to limit the shape and size of the coil 11 from the circumferential and axial directions outside and the circumferential and axial directions inside of the coil 11, so as to avoid changes in the shape, outer diameter, inner diameter, thickness and flatness of the coil 11, to ensure the stability and reliability of signal transmission. The coil 11 is a key component of the eddy current probe, and is prone to small changes in its structure and position under a high-temperature working environment for a long time. Once the coil 11 is displaced or loose, it will affect the stability and reliability of the eddy current probe.

[0101] Referring to Figures 1 to 15 As shown, in some embodiments, the eddy current probe further comprises a reinforcing copper pipe 50 sleeved on a part of the outer periphery of the cable assembly 10 and arranged in the protective cover 30, and a second fastening groove 51 for filling with injection molding glue is formed on the reinforcing copper pipe 50 in the circumferential direction. A plurality of second fastening grooves 51 are formed on the reinforcing copper pipe 50 and are distributed in the axial direction.

[0102] The present embodiment has the same technical effects as the steps SB1 before and SB3 after the above method, which will not be described here.

[0103] Referring to Figures 1 to 15As shown, in some embodiments, the cable assembly 10 comprises a cable 12, a large copper tube 16, a small copper tube 17 and an isolation ring 18 between the large copper tube 16 and the small copper tube 17, the cable 12 comprises a core wire 13, an inner shielding layer 14 wrapped outside the core wire 13 and an insulation layer 15 wrapped outside the inner shielding layer 14, the large copper tube 16 is sleeved outside the insulation layer 15, the first end of the coil 11 is tightly fixed between the large copper tube 16 and the insulation layer 15, the small copper tube 17 is sleeved outside the exposed core wire 13, and the second end of the coil 11 is tightly fixed between the small copper tube 17 and the core wire 13.

[0104] The embodiment has the same technical effects as steps SC1-SC5 of the above method, which will not be described here.

[0105] Referring to Figures 1 to 15 As shown, in some embodiments, the eddy current probe further comprises a cover 60 sleeved outside the coil 11, one end of the fixing cover 20, one end of the protective cover 30 and one end of the metal shell 40.

[0106] The embodiment has the same technical effects as between steps SB3 and SA1 of the above method, which will not be described here.

[0107] The preferred embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present application will not be described again for various possible combination manners. However, these simple modifications and combinations should also be considered as disclosed by the present application and belong to the protection scope of the present application.

Claims

1. A method of fabricating an eddy current probe, comprising: The method comprises the following steps: forming an adjusting thread groove (31) and a locking outer thread (32) and a plurality of positioning grooves (33) extending along the axial direction and cross-communicating with the adjusting thread groove (31) on the outer wall of the protective cover (30) along the axial direction, and spacing the plurality of positioning grooves (33) along the circumferential direction of the protective cover (30); forming a locking inner thread on the inner wall of the metal shell (40) for threadedly cooperating with the locking outer thread (32); inserting the portion of the protective cover (30) along the end where the locking outer thread (32) is located into the metal shell (40), or, rotating the metal shell (40) to be sleeved to the portion of the outer periphery of the protective cover (30) where the locking outer thread (32) is located, so that the protective cover (30) is located at a predetermined position; inserting a tool into the adjusting thread groove (31) while rotating the protective cover (30), so that the protective cover (30) is driven to rotate and move axially relative to the metal shell (40) under the cooperation of the tool and the adjusting thread groove (31), until the circumferential angle of the protective cover (30) relative to the metal shell (40) is the same as a predetermined circumferential angle; locking the position of the protective cover (30) at this time through the cooperation of the positioning groove (33) and the tool; fixing the protective cover (30) and the metal shell (40).

2. The method of claim 1, wherein the step of forming the eddy current probe is performed by a process comprising: The method further comprises the step of forming a protruding platform between every two positioning grooves (33); preferably, the method further comprises the steps of forming a dovetail groove on the protruding platform at the adjusting thread groove (31); and / or, forming a sharp corner groove at the end of at least one end of the positioning groove (33).

3. The method of claim 2, wherein the step of forming the eddy current probe is performed by a process comprising: The method further comprises the step of forming a glue injection long hole (41) on the metal shell, which communicates with the adjusting thread groove (31) and forms an included angle between the extension direction of the glue injection long hole (41) and the extension direction of the adjusting thread groove (31); preferably, the step of fixing the protective cover (30) and the metal shell (40) specifically comprises: pouring injection glue into the glue injection long hole (41), the adjusting thread groove (31) and the positioning groove (33), so as to glue the protective cover (30) and the metal shell (40).

4. The method of manufacturing an eddy current probe according to any one of claims 1 to 3, wherein The method further comprises the steps of: sleeving a fixing cover (20) to the outer periphery of the cable assembly (10); sleeving a reinforcing copper pipe (50) to the outer periphery of the cable assembly (10); sleeving the protective cover (30) to the outer periphery of the fixing cover (20) and the reinforcing copper pipe (50); Preferably, the method further comprises the steps of: forming a plurality of circumferentially extending first fastening grooves (21) on the outer wall of the fixing cover (20) at intervals along the axial direction thereof, injecting injection molding glue between the protective cover (30) and the fixing cover (20) and into the first fastening grooves, and gluing the protective cover (30) and the fixing cover (20); and / or forming a plurality of circumferentially extending second fastening grooves (51) on the outer wall of the reinforced copper pipe (50) at intervals along the axial direction thereof, injecting injection molding glue between the protective cover (30) and the reinforced copper pipe (50) and into the second fastening grooves (51), and gluing the protective cover (30) and the reinforced copper pipe (50).

5. An eddy current probe characterized by, The protective cover (30) and the metal shell (40) are arranged outside the protective cover (30), the outer wall of the protective cover (30) is formed with adjusting screw grooves (31) and locking external threads (32) and a plurality of positioning grooves (33) extending along the axial direction and cross-communicating with the adjusting screw grooves (31), and the plurality of positioning grooves (33) are arranged at intervals along the circumference of the protective cover (30), and the inner wall of the metal shell (40) is formed with locking internal threads threadedly matched with the locking external threads (32).

6. The eddy current probe of claim 5, wherein, The eddy current probe is obtained by using the method for manufacturing the eddy current probe according to claim 1.

7. The eddy current probe of claim 5, wherein, A protrusion is formed between every two positioning grooves (33), and the protective cover (30) and the metal shell (40) are fixedly connected by injection molding glue injected into the positioning grooves (33) and the adjusting screw grooves (31).

8. The eddy current probe according to claim 7, wherein, The adjusting screw groove (31) is formed as a dovetail groove at the protrusion; and / or At least one end of the positioning groove (33) is formed as a sharp corner groove.

9. The eddy current probe of claim 7, wherein, The metal shell (40) is provided with glue injection long holes (41) communicating with the adjusting screw grooves (31), the extension direction of the glue injection long holes (41) and the extension direction of the adjusting screw grooves (31) form an included angle, and the protective cover and the metal shell (40) are further fixedly connected by injection molding glue injected into the glue injection long holes (41); Preferably, the metal shell (40) is provided with a plurality of glue injection long holes (41), the plurality of glue injection long holes (41) are arranged at intervals along the circumference of the metal shell (40), and the extension directions of at least two glue injection long holes (41) form an included angle to form different included angles with the extension direction of the adjusting screw grooves (31).

10. The eddy current probe of claim 7, wherein, The eddy current probe further comprises a cable assembly (10) and a fixing cover (20) fixedly sleeved on a part of the outer periphery of the cable assembly (10), an outer wall of the fixing cover (20) is provided with a first fastening groove (21) filled with injection glue in a circumferential direction, and the cable assembly (10) and the fixing cover (20) are fixedly connected through the injection glue injected into the first fastening groove (21); preferably, a plurality of first fastening grooves (21) are arranged on the fixing cover (20) in an axial direction; more preferably, the first fastening groove (21) is an open ring groove arranged in a circumferential direction of the fixing cover (20), so as to form a reinforcing rib (22) extending in an axial direction on the outer wall of the fixing cover (20); and / or, The eddy current probe further comprises a reinforcing copper pipe (50) sleeved on a part of the outer periphery of the cable assembly (10) and arranged in the protection cover (30), the reinforcing copper pipe (50) is provided with a second fastening groove (51) filled with injection glue in a circumferential direction, and the cable assembly (10) and the reinforcing copper pipe (50) are fixedly connected through the injection glue injected into the second fastening groove (51); preferably, a plurality of second fastening grooves (51) are arranged on the reinforcing copper pipe (50) in an axial direction.

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