CN112114030B - Drill rod thread detection device and method based on ferrite eddy current thermal imaging - Google Patents
Drill rod thread detection device and method based on ferrite eddy current thermal imaging Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 95
- 238000001931 thermography Methods 0.000 title claims abstract description 28
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 19
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- 230000007547 defect Effects 0.000 claims abstract description 78
- 230000006698 induction Effects 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 claims abstract description 21
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000033001 locomotion Effects 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims abstract description 7
- 230000005284 excitation Effects 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims 1
- 230000008439 repair process Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000007822 coupling agent Substances 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- AXWLFOKLQGDQFR-UHFFFAOYSA-N zinc iron(2+) manganese(2+) oxygen(2-) Chemical compound [O-2].[Fe+2].[Zn+2].[Mn+2].[O-2].[O-2] AXWLFOKLQGDQFR-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a drill rod thread detection device based on ferrite eddy current thermal imaging, which comprises a rotary fixing device for fixing a drill rod, wherein an induction coil is arranged beside the rotary fixing device, a manganese zinc ferrite rod is arranged in the induction coil, two ends of the induction coil are fixed on an alternating current heating device, and two ends of the induction coil are electrically connected with the alternating current heating device; the alternating current heating device is fixed on the moving device; an infrared thermal imager is arranged above the rotary fixing device, and the controller and the infrared thermal imager are electrically connected with the PC end. The thread defect detection method adopting the detection device comprises the following steps: setting the motion trail of each part, applying excitation to the induction coil, recording the temperature change of the thread surface by the infrared thermal imager, judging the defect position by utilizing the temperature change, and the like. The scheme has high detection efficiency and provides data support for the prediction of the residual service life of the screw thread and the repair work of the arranged screw thread. Has stronger universality and high automation degree.
Description
Technical Field
The invention relates to the technical field of nondestructive testing, in particular to a drill rod thread detection device and method based on ferrite eddy current thermal imaging.
Background
The drill rod is a steel pipe with threads at the tail part and is used for connecting surface equipment of a drilling machine and drilling and grinding equipment or a bottom hole device at the bottom end of the drilling well. The purpose of the drill pipe is to carry drilling mud to the drill bit and to raise, lower or rotate the bottom hole assembly with the drill bit. The drill pipe must be able to withstand significant internal and external pressure, twisting, bending and vibration. The drill pipe can be used for multiple times in the exploitation and refining process of oil gas. The drill pipes are divided into three types, namely, kelly, drill pipe and weighted drill pipe. The total amount of the drill pipes used in each oil field in China is about 23-25 ten thousand tons, which accounts for about 1/4 of the total demand of the oil well pipes in China. The drill rod thread has similar problems in the use process, and various thread failure forms such as crack, broken buckle, trip, corrosion leakage, taper change of a thread area and the like of the drill rod thread root can be caused under the conditions of long-term bearing of alternating force, repeated screwing and severe working environment, so that the drill rod is seriously broken, and great economic loss and labor loss are brought to production and operation. Particularly, in recent years, with the acceleration of the localization process of the special petroleum pipe, the sticking buckle failure accident of the drill rod occurs, the service life of the drill rod is greatly shortened, the workover workload of an oil well is increased, the production of the oil field is influenced, and meanwhile, the great economic loss is brought to the oil field. Therefore, the developed and effective drill rod thread detection device has great engineering significance and practical value.
Aiming at the detection of the drill rod threads, currently, common detection methods such as manual visual inspection, magnetic powder detection, penetration detection, magnetic leakage detection, ultrasonic detection and the like mainly exist.
The manual visual inspection is suitable for detecting drill rod threads with smaller batches; the penetration detection is similar to the magnetic powder detection principle, and adopts a penetrating agent as a detection medium, and the penetrating agent is added on the threaded surface of the drill rod. After the permeation is completed, the redundant penetrant is removed, and then the defects can be found out through the penetrant remained in the defects by adopting a corresponding development method. Because the penetrating agent can penetrate into the defects with smaller size, the two methods have better detection effect on the microcracks; because the drill rod thread is positioned at the end of the drill rod, a conventional magnetic flux leakage detection signal can be submerged in a strong interference magnetic field, and the detection of the conventional magnetic flux leakage detection signal is difficult. The weak magnetic detection method is adopted in engineering to detect the drill rod threads, so that partial defects can be detected; the ultrasonic detection can detect defects at the bottom of the drill rod thread by adopting an echo method, and has great advantages for detecting deeper defects or puncture cracks because the ultrasonic can propagate for a longer distance in the drill rod thread.
The manual detection method is time-consuming and labor-consuming, and cannot meet the detection requirement of the drill rod threads in a large scale. Although the penetration detection and the magnetic powder detection have higher detection precision, the processes of penetration, imaging, defect observation and the like are completed manually, the efficiency is low, the surface of the thread is polluted, and certain influence is caused on the environment. The magnetic leakage detection has larger background noise even if the weak magnetic detection is adopted due to the end effect, and the detection rate is not high. Although the ultrasonic detection can detect deeper defects, the detection rate is not high because the threaded structure of the drill rod is complex and only partial defects at the bottom can reflect ultrasonic waves back to the probe. And the ultrasonic detection needs couplant, which also affects the efficiency to a certain extent. It can be seen that the existing drill rod thread detection schemes have great problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a drill rod thread detection device and method based on ferrite vortex thermal imaging, which are convenient for detecting the defect of the tooth root position of the drill rod thread.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the drill rod thread detection device based on ferrite eddy current thermal imaging comprises a rotary fixing device for fixing a drill rod, wherein an induction coil is arranged beside the rotary fixing device, a manganese zinc ferrite rod is arranged in the induction coil, two ends of the induction coil are fixed on an alternating current heating device, and two ends of the induction coil are electrically connected with the alternating current heating device; the alternating current heating device is fixed on a sliding block of the vertical first linear moving module, and the first linear moving module is fixed on a sliding block of the horizontal second linear moving module; the stepping motors of the first linear moving module and the second linear moving module are electrically connected with a motor driver, and the motor driver is electrically connected with the controller; an infrared thermal imager is arranged above the rotary fixing device, and the controller and the infrared thermal imager are electrically connected with the PC end.
A thread defect detection method adopting a drill rod thread detection device based on ferrite vortex thermal imaging comprises the following steps:
s1: inputting screw thread parameters of the drill rod to be detected to a PC end, wherein the screw thread parameters comprise screw pitch, screw diameter and teeth;
s2: generating a moving path of the first linear moving module, a moving path of the second linear moving module and a rotating speed of a three-phase asynchronous motor driving roller according to the screw pitch, the screw diameter and the teeth, and ensuring that the manganese zinc ferrite rod can be attached to the screw surface to move axially along the drill rod in the rotating process of the drill rod;
s3: the drill rod is placed on the two pairs of rollers, and a certain gap is reserved between the manganese zinc ferrite rod and the bottom of the thread;
s2: the three-phase asynchronous motor drives the roller to rotate, the drill rod is driven to rotate around the axis, the alternating current heating device applies excitation to the induction coil, and the infrared thermal imager records the temperature change of the threaded surface;
s5: taking the temperature which does not enter the thread detection area when the detection is started as a comparison temperature;
s6: after entering a detection area, the infrared thermal imager compares the temperature detected by each frame with a comparison temperature;
s7: if the temperature of a certain position on the thread is detected to be greater than a certain threshold value H of the comparison temperature, the position starts to generate the thread defect, the position is the thread defect starting position, and otherwise, the thread defect does not occur;
s8: if the temperature of a certain position on the thread is detected to be smaller than the comparison temperature by a certain threshold h, the position is the middle position of the thread defect, otherwise, the thread defect does not appear;
s8: taking two adjacent defect initial positions at two sides of the defect middle position as two ends of a complete defect, wherein the length between the two defect initial positions is the length of the complete defect, and marking the positions of the defects on the thread surface;
s9: and judging the size of the defect size by adopting the difference value between the temperature of the defect starting position and the contrast temperature, wherein the larger the difference value between the temperature of the defect starting position and the contrast temperature is, the larger the defect size is, and otherwise, the smaller the defect size is.
The beneficial effects of the invention are as follows: compared with the traditional drill rod thread detection device, the induction heating device has the advantages that the speed of generating heat is high, detection can be completed in extremely short time, non-contact measurement is realized, a coupling agent is not needed, the thread surface cannot be influenced, and no pollution is caused to the environment. This allows the detection process to be performed at a relatively high speed and with high efficiency.
Because of the skin effect of induction heating, eddy currents can be distributed along the near surface of the thread, so that cracks with small depth can also disturb the temperature field, and the thermal imaging detection has a high detection rate on fatigue cracks on the surface.
And the defects cause disturbance to the eddy current, so that the generated uneven temperature distribution can be transmitted to a computer in a numerical matrix mode by means of the infrared thermal imager. The thermal imaging detection method not only can detect defects, but also can scale the geometric dimensions of the defects, and can provide data support for predicting the residual life of the threads and arranging the repair work of the threads.
The shape similar to the thread surface is adopted when the thermal imaging detection is adopted, so that the influence of lift-off caused by the uneven thread surface can be reduced, the bottom surface of the thread can be uniformly heated, and the defect calibration is facilitated. The scanning detection of the thread surface is realized by the rotary scanning thermal imaging detection method. Thus, the requirement of full-circle detection of the threads can be met.
According to the scheme, aiming at drill rod threads of different models, the trend of the threaded surface can be fitted through the rotating speed of the motor and the motion trail of the induction coil, so that the drill rod thread has stronger universality and high automation degree.
Drawings
Fig. 1 is a block diagram of a drill rod thread detection device based on ferrite eddy current thermal imaging.
FIG. 2 is a schematic illustration of the contact of a manganese zinc ferrite rod with threads.
FIG. 3 is a graph showing a temperature profile of a thermal infrared imager when a defect is detected.
Wherein, 1, PC end, 2, controller, 3, motor driver, 4, stepping motor, 5, AC heating power supply, 6, circulating water tank, 7, bracket, 8, AC heating device, 9, hollow copper tube, 10, screw threads, 11, a three-phase asynchronous motor, 12, a drill rod, 13, a roller, 14, a manganese zinc iron oxide rod, 15, an infrared thermal imager, 16, screw thread bottoms, 17, a heated temperature field, 18 and defects.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, the drill rod thread detection device based on ferrite eddy current thermal imaging in the scheme comprises a rotary fixing device for fixing a drill rod 12, an induction coil is arranged beside the rotary fixing device, a manganese zinc ferrite rod 14 is arranged in the induction coil, two ends of the induction coil are fixed on an alternating current heating device 8, and two ends of the induction coil are electrically connected with the alternating current heating device 8; the alternating current heating device 8 is fixed on a sliding block of a vertical first linear movement module, the first linear movement module is fixed on a sliding block of a horizontal second linear movement module, and the second linear movement module is fixed on the bracket 7; the stepping motors 4 of the first linear moving module and the second linear moving module are electrically connected with the motor driver 3, and the motor driver 3 is electrically connected with the controller 2; an infrared thermal imager 15 is arranged above the rotary fixing device, and the controller 2 and the infrared thermal imager 15 are electrically connected with the PC terminal 1.
The infrared thermal imager 15 continuously reads the heat radiation in the visual angle at a certain frequency, converts the heat radiation into temperature distribution parameters, and transmits the temperature distribution parameters into the PC end 1; the induction coil outputs high-frequency alternating current to provide a high-frequency magnetic field for the manganese zinc ferrite rod 14; the manganese zinc ferrite rod 14 can gather a high-frequency magnetic field induced by the induction coil and form a magnetic loop with the detection part of the thread 10 to form fixed-point heating. The infrared thermal imager 15 is perpendicular to the detection surface of the threads 10 of the drill pipe 12 so that the attenuation of thermal radiation is minimized, thereby improving the accuracy of temperature capture.
The first linear motion module and the second linear motion module are perpendicular to each other, and provide motion along the circumferential direction and the horizontal direction of the drill rod 12 for the induction coil to adapt to the change of the height of the thread 10 of the drill rod 12 during rotation.
The rotary fixing device comprises two pairs of rollers 13, each pair of rollers 13 are meshed with each other, the two pairs of rollers 13 are arranged on the same straight line, each pair of rollers 13 is driven by a three-phase asynchronous motor 11, and the three-phase asynchronous motor 11 is electrically connected with the controller 2. The three-phase alternating current motor drives the two pairs of rollers 13 to rotate, so that the drill rod 12 is driven to rotate around the axial direction, and rotary motion is provided for rotary scanning detection.
The circulating water tank 6, circulating water tank 6 is connected with alternating current heating device 8 through the water pump, and the water pump is connected with the controller 2 electricity, and alternating current heating device 8 is connected with alternating current heating power supply 5 electricity, can provide circulating cooling water for alternating current heating device 8, guarantees heating device's temperature is invariable.
The two ends of the induction coil are connected with the alternating current heating device 8 through the hollow copper pipe 9, and the alternating current heating coil is wound on the periphery of the ferrite by adopting a uniform multi-turn structure, so that the magnetic field intensity of the center of the coil is increased, more energy is provided for the manganese zinc ferrite rod 14, and the screw thread 10 can be ensured to be sufficiently heated in the detection process. The induction coil can be placed freely, so that detection requirements under various working conditions are guaranteed.
The front end of the manganese zinc ferrite rod 14 is fitted to the edge of the thread 10 of the drill rod 12 so that the manganese zinc ferrite rod 14 can extend into the bottom of the thread 10 to solve the problem of uneven energy distribution between the crests and roots when the thread 10 is heated.
As shown in fig. 2, the thread defect detection method of the drill rod thread detection device based on ferrite eddy current thermal imaging comprises the following steps:
s1: inputting screw thread parameters of the drill rod 12 to be detected into the PC end 1, wherein the screw thread parameters comprise screw pitch, screw diameter and teeth;
s2: generating a moving path of a first linear moving module, a moving path of a second linear moving module and a rotating speed of a driving roller 13 of a three-phase asynchronous motor 11 according to the screw pitch, the screw diameter and the teeth, and ensuring that a manganese zinc ferrite rod 14 can axially move along the drill rod 12 by being attached to the surface of the screw thread 10 in the rotating process of the drill rod 12; the thread 10 of the drill rod 12 detects the root of the tooth where stress is concentrated, and thus a rotational scan is required to cover the entire circumference of the thread 10.
S3: the drill rod 12 is placed on the two pairs of rollers 13, and a certain gap is ensured between the manganese zinc ferrite rod 14 and the threaded bottom 16;
s2: the three-phase asynchronous motor 11 drives the roller 13 to rotate, drives the drill rod 12 to rotate around the axis, the alternating current heating device 8 applies excitation to the induction coil, and the infrared thermal imager 15 records the temperature change of the surface of the thread 10;
the method for calculating the surface temperature of the thread 10 comprises the following steps:
wherein J is e For the eddy current density induced by the induction coil, sigma is the conductivity of the material, ρ is the material density, C is the specific heat capacity of the drill rod thread material, k is the heat conductivity coefficient of the drill rod thread material, u is the linear velocity vector of the thread 10 at the detection position, T is the temperature of the thread surface, T is the time, and Q is the total energy output by the induction coil to the drill rod thread. It can be seen that a greater eddy current density is able to induce a higher temperature, and therefore, as shown in fig. 3, the temperature field 17 in which the surface of the thread 10 is heated, the temperature distribution of the surface of the thread 10 is distorted, and the temperature distortion point can be identified by the infrared thermal imager 15, so that the presence of the defect 18 is judged.
The infrared thermal imager 15 is kept fixed during the detection process, the visual angle of the infrared thermal imager is always kept in a region at the upper end of the thread 10 of the drill rod 12, and all surfaces of the thread 10 of the drill rod 12 pass through the region in time in the rotation process, so that the full-circle detection of the thread 10 of the drill rod 12 can be ensured. The infrared thermal imager 15 disperses the temperature distribution in the field of view into 640 x 120 pixels, each pixel corresponds to a temperature value, and the temperature of the surface of the thread 10 is read by data of 200 times per second and is transmitted into the PC end 1.
S5: taking the temperature which does not enter the detection area of the thread 10 when the detection is started as the comparison temperature;
s6: after entering the detection area, the thermal infrared imager 15 compares the temperature detected by each frame with a comparison temperature;
s7: if the temperature of a certain position on the thread 10 is detected to be greater than the comparison temperature by a certain threshold value H, the thread defect 18 starts to appear at the position, the position is the starting position of the thread defect 18, otherwise, the thread defect 18 does not appear;
s8: if the temperature of a certain position on the thread 10 is detected to be smaller than the comparison temperature by a certain threshold h, the position is the middle position of the thread defect 18, otherwise, the thread defect 18 does not appear;
s8: taking two adjacent initial positions of the defect 18 on two sides of the middle position of the defect 18 as two ends of a complete defect 18, wherein the length between the initial positions of the two defects 18 is the length of the complete defect 18, and marking the positions of the defects 18 on the surface of the thread 10;
s9: and judging the size of the defect 18 by adopting the difference between the temperature of the initial position of the defect 18 and the contrast temperature, wherein the larger the difference between the temperature of the initial position of the defect 18 and the contrast temperature is, the larger the size of the defect 18 is, and otherwise, the smaller the size of the defect 18 is.
Compared with the traditional drill rod thread detection device, the induction heating device has the advantages that the speed of generating heat is high, detection can be completed in extremely short time, non-contact measurement is realized, a coupling agent is not needed, the surface of the thread 10 cannot be influenced, and no pollution is caused to the environment. This allows the detection process to be performed at a relatively high speed and with high efficiency.
Because of the skin effect of induction heating, eddy currents are distributed along the near surface of the thread 10, cracks of small depth can also disturb the temperature field, which results in a high detection rate of fatigue cracks on the surface for thermal imaging detection.
And the temperature distribution unevenness generated by the disturbance of the eddy current caused by the defect 18 can be transmitted to a computer in a numerical matrix mode by means of the infrared thermal imager 15. The thermal imaging detection method not only detects the defect 18, but also marks the geometry of the defect 18, which can provide data support for predicting the remaining life of the thread 10 and scheduling the repair work of the thread 10.
The shape similar to the surface of the thread 10 is adopted when the thermal imaging detection is adopted, so that the influence of lift-off caused by the uneven surface of the thread 10 can be reduced, the bottom surface of the thread 10 can be uniformly heated, and the calibration of the defect 18 is facilitated. The rotational scanning thermal imaging detection method achieves scanning detection of the surface of the thread 10. This can fulfill the need for full circumference detection of the thread 10.
The scheme can be used for fitting the trend of the surface of the thread 10 by setting the rotating speed of the motor and the motion trail of the induction coil according to the drill rod 12 threads 10 of different models, and has strong universality and high automation degree.
Claims (8)
1. The drill rod thread detection device based on ferrite eddy current thermal imaging is characterized by comprising a rotary fixing device for fixing a drill rod (12), wherein an induction coil is arranged beside the rotary fixing device, a manganese zinc ferrite rod (14) is arranged in the induction coil, two ends of the induction coil are fixed on an alternating current heating device (8), and two ends of the induction coil are electrically connected with the alternating current heating device (8); the alternating current heating device (8) is fixed on a sliding block of a vertical first linear moving module, and the first linear moving module is fixed on a sliding block of a horizontal second linear moving module; the stepping motors (4) of the first linear movement module and the second linear movement module are electrically connected with the motor driver (3), and the motor driver (3) is electrically connected with the controller (2); an infrared thermal imager (15) is arranged above the rotary fixing device, and the controller (2) and the infrared thermal imager (15) are electrically connected with the PC end (1);
the end part of the manganese zinc ferrite rod (14) is fitted with the edge of the thread (10) of the drill rod (12); when thermal imaging detection is adopted, the manganese zinc ferrite rod (14) adopts a shape similar to the surface of the thread (10), so that the influence of lift-off caused by uneven surface of the thread (10) is reduced, the bottom surface of the thread (10) can be uniformly heated, and the calibration of the defect (18) is facilitated; the rotary scanning thermal imaging detection method realizes scanning detection on the surface of the thread (10) and realizes full-circle detection of the thread (10);
according to the thread pitch, the thread diameter and the tooth shape, a first linear movement module, a second linear movement module and the rotation speed of a three-phase asynchronous motor (11) driving roller (13) are generated, so that the manganese zinc ferrite rod (14) can be attached to the surface of the thread (10) to axially move along the drill rod (12) in the rotation process of the drill rod (12).
2. The drill rod thread detection device based on ferrite eddy current thermal imaging according to claim 1, wherein the rotary fixing device comprises two pairs of rollers (13), each pair of rollers (13) are meshed with each other, the two pairs of rollers (13) are arranged on the same straight line, each pair of rollers (13) is driven by a three-phase asynchronous motor (11), and the three-phase asynchronous motor (11) is electrically connected with the controller (2).
3. The drill rod thread detection device based on ferrite vortex thermal imaging according to claim 1, further comprising a circulating water tank (6), wherein the circulating water tank (6) is connected with an alternating current heating device (8) through a water pump, the water pump is electrically connected with the controller (2), and the alternating current heating device (8) is electrically connected with an alternating current heating power supply (5).
4. The drill rod thread detection device based on ferrite eddy current thermal imaging according to claim 1, wherein two ends of the induction coil are electrically connected with an alternating current heating device (8) through a hollow copper tube (9).
5. The drill rod thread detection device based on ferrite eddy current thermal imaging according to claim 1, wherein the induction coil is of a uniform multi-turn structure and surrounds the periphery of a manganese zinc ferrite rod (14).
6. A thread defect detection method using the ferrite eddy current thermal imaging-based drill rod thread detection device as recited in any one of claims 1 to 5, comprising the steps of:
s1: inputting screw thread parameters of a drill rod (12) to be detected into the PC end (1), wherein the screw thread parameters comprise screw pitch, screw diameter and teeth;
s2: generating a moving path of a first linear moving module, a moving path of a second linear moving module and a rotating speed of a driving roller (13) of a three-phase asynchronous motor (11) according to the screw pitch, the screw diameter and the teeth, and ensuring that a manganese zinc ferrite rod (14) can be attached to the surface of a screw thread (10) to axially move along the drill rod (12) in the rotating process of the drill rod (12);
s3: the drill rod (12) is placed on the two pairs of rollers (13) and a certain gap is ensured between the manganese zinc ferrite rod (14) and the thread bottom (16);
s2: the three-phase asynchronous motor (11) drives the roller (13) to rotate, the drill rod (12) is driven to rotate around the axis, the alternating current heating device (8) applies excitation to the induction coil, the tip of the manganese zinc ferrite rod (14) forms vortex, the surface of the thread (10) is heated, and the infrared thermal imager (15) records the temperature change of the surface of the thread (10);
s5: taking the temperature which does not enter a detection area of the thread (10) when the detection is started as a comparison temperature;
s6: after entering a detection area, the infrared thermal imager (15) compares the temperature detected by each frame with a comparison temperature;
s7: if the temperature of a certain position on the thread (10) is detected to be greater than a certain threshold value H of the comparison temperature, the position starts to generate a defect (18), the position is the initial position of the defect (18), otherwise, the defect (18) does not generate;
s8: if the temperature of a certain position on the thread (10) is detected to be smaller than a certain threshold value h of the comparison temperature, the position is the middle position of the defect (18), otherwise, the defect (18) does not appear;
s8: taking the initial positions of two adjacent defects (18) on two sides of the middle position of the defect (18) as two ends of a complete defect (18), wherein the length between the initial positions of the two defects (18) is the length of the complete defect (18), and marking the position of the defect (18) on the surface of the thread (10);
s9: and judging the size of the defect (18) by adopting the difference between the temperature of the initial position of the defect (18) and the contrast temperature, wherein the larger the difference between the temperature of the initial position of the defect (18) and the contrast temperature is, the larger the size of the defect (18) is, and otherwise, the smaller the size of the defect (18) is.
7. The thread defect detection method of the drill rod thread detection device based on ferrite eddy current thermal imaging according to claim 6, wherein the calculation method of the surface temperature of the thread (10) is as follows:
wherein J is e For the eddy current density induced by the induction coil, sigma is the conductivity of the material, ρ is the material density, C is the specific heat capacity of the drill rod thread material, k is the heat conductivity coefficient of the drill rod thread material, u is the linear velocity vector of the thread (10) at the detection position, T is the temperature of the thread surface, T is the time, and Q is the total energy output by the induction coil to the drill rod thread.
8. The method for detecting thread defects of a drill rod thread detection device based on ferrite eddy current thermal imaging according to claim 6, wherein the infrared thermal imager (15) disperses the temperature distribution in the field of view into 640 x 120 pixels, each pixel corresponds to a temperature value, and the temperature of the surface of the thread (10) is read by data of 200 times per second and is transmitted into the PC end (1).
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