CN101893603A - Thread detection device and crack detection method for drilling tool - Google Patents
Thread detection device and crack detection method for drilling tool Download PDFInfo
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- CN101893603A CN101893603A CN201010247360.3A CN201010247360A CN101893603A CN 101893603 A CN101893603 A CN 101893603A CN 201010247360 A CN201010247360 A CN 201010247360A CN 101893603 A CN101893603 A CN 101893603A
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Abstract
The invention belongs to the technical field of detection appliances, in particular relates to a thread detection device and a crack detection method for a drilling tool. The method is characterized by comprising the following steps that: firstly, an eddy current coil at the crest of a probe framework is tightly attached to the surface of the thread root of the detected drilling tool; secondly, the probe framework performs circumferential scanning and multi-coil detection along the thread rotating direction of the detected drilling tool; and finally, the eddy current coil outputs a detection result to an eddy current detection instrument in a form of an electrical signal, and the eddy current detection instrument displays the detection result, wherein the eddy current coils are uniformly distributed on a probe, the detection coverage rate can reach 100 percent by rotating for q circles, q is equal to N/n, N refers to the number of teeth, and n refers to the number of the eddy current coils. The thread detection device and the crack detection method for the drilling tool can quickly, accurately and quantitatively detect and identify the defects of the thread area of the drilling tool, so that the thread detection efficiency of the drilling tool is improved.
Description
Technical field
The invention belongs to the appliance technical field, particularly a kind of drilling tool screw device and crack detecting method.
Background technology
Drilling tool is the critical component of drilling operation, drilling tool comprises drilling rod, drill collar, extra-weight drillpipe, drilling tool stabilizer, drill string X-over etc., connect by screw thread between them, because the stressed complexity in down-hole, can produce fatigue crack at the screw thread position inevitably, serious meeting causes the drilling tool fracture accident, causes enormous economic loss.
The drilling tool screw thread generally all adopts magnetic detection, ultrasonic detection method at present.
The magnetic detection method detects the restriction that there is the following aspects in the drilling tool screw thread:
(1) magnetic detects only convenient externally threaded detection, detection observation difficulty to internal thread is big, and can only detect thread surface and near surface flaw, and can not detect and bury darker inherent vice, detectable inherent vice depth of burial is generally in 1～2mm scope;
(2) need detected screw thread is cleaned before the employing magnetic detects, the thread surface cleanliness require high, and operation is loaded down with trivial details, and detection efficiency is low, and labour intensity is bigger;
(3) magnetic detects the quantitatively degree of depth of defective;
(4) magnetic detects the defective that all detects by an unaided eye, and the professional that the judgement of magnetic trace and explanation need technical experience carries out, and testing result is influenced greatly by human factor, is easy to generate erroneous judgement or omission.
Be subjected to the influence of drilling tool screw thread form, the remolding sensitivity that ultrasonic detection method detects drilling tool thread root crackle is lower, can only detect bigger, the crackle that can reflect sound wave, and it is bad in the PROCESS COUPLING of drilling tool end face scanning to pop one's head in, and testing result is subjected to artificial factor bigger.Ultrasonic detection method can be judged the position of crackle more exactly, but the degree of depth of drilling tool thread root crackle is carried out quantitative evaluation exists certain difficulty.
Summary of the invention
The purpose of this invention is to provide a kind of drilling tool screw device and crack detecting method that can carry out quantification detection and Identification quickly and accurately, improve drilling tool screw thread detection efficiency drilling tool threaded portion defective.
The technical scheme that the present invention solves its technical matters employing is: the crack detecting method that designs a kind of drilling tool screw device, it is characterized in that: it comprises the following steps: at first, the eddy current coil at probe skeleton crest place is close to the surface of tested drilling tool thread root, then, the probe skeleton carries out circumferential scanning along the direction of tested drilling tool screw thread rotation, multi-thread circle detects, at last, eddy current coil outputs to the electric signal of testing result in the eddy detecting instrument, demonstrates measured result by eddy detecting instrument.
Described eddy current coil evenly distributes on probe, only needs rotation q circle to detect coverage rate and promptly can reach 100%, and q=N/n, N represent the tooth number, and n represents the vorticity line number of turns.
Drilling tool screw device according to the crack detecting method design, it is characterized in that: it comprises the detection probe that the eddy current coil by probe skeleton and probe skeleton crest place constitutes, probe skeleton one side is the tooth that the screw thread of the drilling tool threaded area that detects with needs is complementary, probe skeleton opposite side is fixed with the metallic shield shell, and the crest place of probe skeleton is equipped with eddy current coil.
Described detection probe is divided into external thread detection probe and internal thread detection probe, the eddy current coil of external thread detection probe places the crest with the corresponding internal thread skeleton of external thread detection probe, and the eddy current coil of internal thread detection probe places the crest with the corresponding external thread skeleton of internal thread detection probe.
The top of described eddy current coil extends to the crest place of probe skeleton, and the eddy current coil bottom is fixed with compression spring, and compression spring is pressed on probe skeleton tooth root.
The used material of described probe skeleton is an epoxy resin.
There is metallic channel described probe skeleton inside, metallic channel is communicated with the eddy current coil of each tooth of probe skeleton, metallic channel is communicated with the fixedly connected aviation socket of skeleton one end of popping one's head in, and the eddy current coil extension line is connected to the aviation socket via metallic channel, and eddy current coil is electrically connected with defectoscope through aviation plug.
Described eddy current coil is made up of magnetic core and enameled wire two parts, and magnetic core arranges that perpendicular to thread surface enameled wire is wrapped on the magnetic core, and enameled wire is connected with pin in the aviation socket through metallic channel.
The invention has the beneficial effects as follows, arrange eddy current coil by crest place at the probe skeleton, the utilization electromagnetic induction principle detects, when probe moves in the drilling tool thread surface, because defective causes conductivity of electrolyte materials, the variation of magnetic permeability and size, make that eddy current changes in the metal, and then make eddy current magnetism be different from flawless situation to the retroaction of coil, therefore cause that coil impedance changes, measure this variable quantity by eddy detecting instrument and just can differentiate that material has zero defect, this drilling tool screw thread eddy current probe is because there is compression spring the eddy current coil lower end, therefore make eddy current coil can adapt to the variation of different size drilling tool screw thread, make it have versatility, can guarantee the stationarity of detection probe motion again, reduce the influence of Lift-off effect.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is the B place enlarged drawing of Fig. 1;
Fig. 3 is the left view of Fig. 1;
Fig. 4 is that the embodiment of the invention is applied to externally threaded structural representation;
Fig. 5 is the structural representation that the embodiment of the invention is applied to internal thread;
Fig. 6 is the output signal diagram of assay.
Among the figure: 1, metallic shield shell; 2, compression spring; 3, probe skeleton; 4, eddy current coil; 5, metallic channel; 6, aviation socket; 7, enameled wire; 8, magnetic core; 9, drilling tool body; 10, detection probe; 11, drilling tool threaded area.
Embodiment
Drilling tool screw thread crack detecting method of the present invention, comprise the following steps: at first, the eddy current coil 4 at probe skeleton 3 crest places is close to the surface of tested drilling tool thread root, then, probe skeleton 3 carries out circumferential scanning along the direction of tested drilling tool screw thread rotation, and multi-thread circle detects, and is last, eddy current coil 4 outputs to the electric signal of testing result in the eddy detecting instrument, demonstrates measured result by eddy detecting instrument.
Drilling tool threaded probe of the present invention, it comprises the detection probe 10 that the eddy current coil 4 by probe skeleton 3 and probe skeleton 3 crest places constitutes, probe skeleton 3 one sides are teeth that the screw thread of the drilling tool threaded area 11 that detects with needs is complementary, probe skeleton 3 opposite sides are fixed with metallic shield shell 1, the crest place of probe skeleton 3 is equipped with eddy current coil 4, the screw thread of being close to the drilling tool threaded area 11 of needs detection by the tooth of probe skeleton 3, the crackle situation that the eddy current coil 4 of probe skeleton 3 crests detects tested screw thread realizes the screw thread crack detection.
As Fig. 1, shown in the structural representation of the present invention, the present invention mainly is made up of metallic shield shell 1, compression spring 2, probe skeleton 3, eddy current coil 4, and probe skeleton 3 used materials are epoxy resin.Probe skeleton 3 adopts the cast of epoxy resin mantle, good with the screw thread matching of drilling tool threaded area 11, probe skeleton 3 one sides are teeth that the screw thread of the drilling tool threaded area 11 that detects with needs is complementary, probe skeleton 3 opposite sides are fixed with metallic shield shell 1, metallic shield shell 1 can play the effect of shielding outside electromagnetic interference, make measurement result more accurate, the tooth of probe skeleton 3 is built-in with eddy current coil 4, the top of eddy current coil 4 extends to the crest place of probe skeleton 3, eddy current coil 4 bottoms are fixed with compression spring 2, compression spring 2 is pressed on probe skeleton 3 tooth roots, eddy current coil 4 is under the effect of compression spring 2, with certain pressure, be pressed on the ridge root, realize eddy current coil 4 radially than moderate fluctuation.
There is metallic channel 5 probe skeleton 3 inside, metallic channel 5 is communicated with the eddy current coil 4 of probe skeleton 3 each tooth, metallic channel 5 is communicated with the fixedly connected aviation socket 6 of skeleton 3 one ends of popping one's head in, eddy current coil 4 extension lines are connected to aviation socket 6 via metallic channel 5, and eddy current coil 4 is electrically connected with defectoscope through aviation plug 6.Detection signal is input to defectoscope, and the defectoscope pumping signal is input probe thus also, and defectoscope does not describe in detail at this for existing known device.
As shown in Figure 2, eddy current coil 4 is made up of magnetic core 8 and enameled wire 7 two parts, and magnetic core 8 arranges that perpendicular to thread surface enameled wire 7 is wrapped on the magnetic core 8, and enameled wire 7 is connected with pin in the aviation socket 6 through metallic channel 5.
As Fig. 4, the present invention of Fig. 5 is applied to external thread, shown in the structural representation of internal thread, the probe skeleton 3 of this eddy current probe 10 can become corresponding structure according to the screw thread design of different drilling tool threaded area 11, detection probe 10 is divided into external thread detection probe and internal thread detection probe, the eddy current coil 4 of external thread detection probe places the crest with the corresponding internal thread skeleton of external thread detection probe, the eddy current coil 4 of internal thread detection probe places the crest with the corresponding external thread skeleton of internal thread detection probe, detection probe 10 is close to the thread surface of the drilling tool threaded area 11 of drilling tool body 9 during detection, and detection probe 10 is carried out circumferential scanning along the direction of drilling tool threaded area 11 screw thread rotation.
During use, the eddy current coil 4 at probe skeleton 3 crest places is close to the surface of tested drilling tool thread root, because there is compression spring 2 eddy current coil 4 lower ends, therefore make eddy current coil can adapt to the variation of different size drilling tool screw thread, make it have versatility, can guarantee the stationarity of detection probe motion again, reduce the influence of Lift-off effect; Probe carries out circumferential scanning along the direction of tested drilling tool screw thread rotation, and multi-thread circle detects, and eddy current coil evenly distributes on probe, only need rotation q circle to detect coverage rate and promptly can reach 100%, q=N/n, N represent the tooth number, n represents the vorticity line number of turns, can prevent omission, improves detection efficiency.According to the distribution of detecting element and the corresponding relation of detection signal, the location that can realize defective.
Eddy current test is the utilization electromagnetic induction principle, eddy current flaw detec is failed sine-wave current in the eddy current coil 4 of eddy current test probe by aviation plug 6, eddy current coil 4 both had been a drive coil, it also is magnetic test coil, set up alternating magnetic fields around, when popping one's head near the metal surface, it is eddy current that the alternating magnetic field around the coil produces induction current in the metal surface.This eddy current also produces the magnetic field of same frequency, and its direction is opposite with the coil magnetic field direction.The loss resistance of swirl channel, and the anti-magnetic flux of eddy current generation reflex to probe coil again, thereby have changed the size and the phase place of coil current, have promptly changed the impedance of coil.Therefore, when probe moves in the drilling tool thread surface, because defective causes the variation of conductivity of electrolyte materials, magnetic permeability and size, make that eddy current changes in the metal, and then make eddy current magnetism be different from flawless situation to the retroaction of coil, therefore cause that coil impedance changes, measure this variable quantity by eddy detecting instrument and just can differentiate that material has zero defect.This eddy current probe makes eddy current coil directly near thread root owing to adopt special structure, can effectively detect the defective of thread root.
The output signal of eddy detecting instrument after the detection amplification filtering as shown in Figure 6, each sharp cutting edge of a knife or a sword is a defect waves, the degree of depth of the size of its amplitude reflection defective.
Claims (8)
1. the crack detecting method of drilling tool screw device, it is characterized in that: it comprises the following steps: at first, the eddy current coil (4) at probe skeleton (3) crest place is close to the surface of tested drilling tool thread root, then, probe skeleton (3) carries out circumferential scanning along the direction of tested drilling tool screw thread rotation, and multi-thread circle detects, and is last, eddy current coil (4) outputs to the electric signal of testing result in the eddy detecting instrument, demonstrates measured result by eddy detecting instrument.
2. the crack detecting method of drilling tool screw device according to claim 1, it is characterized in that: described eddy current coil (4) evenly distributes on probe, only needs rotation q circle to detect coverage rate and promptly can reach 100%, q=N/n, N represents the tooth number, and n represents the vorticity line number of turns.
3. according to the drilling tool screw device of crack detecting method design, it is characterized in that: it comprises the detection probe (10) by eddy current coil (4) formation at probe skeleton (3) and probe skeleton (3) crest place, probe skeleton (3) one sides are teeth that the screw thread of the drilling tool threaded area (11) that detects with needs is complementary, probe skeleton (3) opposite side is fixed with metallic shield shell (1), and the crest place of probe skeleton (3) is equipped with eddy current coil (4).
4. drilling tool screw device according to claim 3, it is characterized in that: described detection probe (10) is divided into external thread detection probe and internal thread detection probe, the eddy current coil of external thread detection probe (4) places the crest with the corresponding internal thread skeleton of external thread detection probe, and the eddy current coil of internal thread detection probe (4) places the crest with the corresponding external thread skeleton of internal thread detection probe.
5. drilling tool screw device according to claim 3, it is characterized in that: the top of described eddy current coil (4) extends to the crest place of probe skeleton (3), eddy current coil (4) bottom is fixed with compression spring (2), and compression spring (2) is pressed on probe skeleton (3) tooth root.
6. drilling tool screw device according to claim 3 is characterized in that: the used material of described probe skeleton (3) is an epoxy resin.
7. drilling tool screw device according to claim 3, it is characterized in that: there is metallic channel (5) described probe skeleton (3) inside, metallic channel (5) is communicated with the eddy current coil (4) of each tooth of probe skeleton (3), metallic channel (5) is communicated with the fixedly connected aviation socket (6) of skeleton (3) one ends of popping one's head in, eddy current coil (4) extension line is connected to aviation socket (6) via metallic channel (5), and eddy current coil (4) is electrically connected with defectoscope through aviation plug (6).
8. drilling tool screw device according to claim 3, it is characterized in that: described eddy current coil (4) is made up of magnetic core (8) and enameled wire (7) two parts, magnetic core (8) is arranged perpendicular to thread surface, enameled wire (7) is wrapped on the magnetic core (8), and enameled wire (7) is connected with pin in the aviation socket (6) through metallic channel (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010247360.3A CN101893603A (en) | 2010-08-06 | 2010-08-06 | Thread detection device and crack detection method for drilling tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010247360.3A CN101893603A (en) | 2010-08-06 | 2010-08-06 | Thread detection device and crack detection method for drilling tool |
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| CN101893603A true CN101893603A (en) | 2010-11-24 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344745A (en) * | 2013-07-12 | 2013-10-09 | 爱德森（厦门）电子有限公司 | Device and method for automatically and spirally scanning inner wall of screw hole by eddy |
| CN103913509A (en) * | 2014-04-19 | 2014-07-09 | 中国人民解放军第五七二一工厂 | Defect detection method of paint aluminum alloy frame plate |
| CN104181227A (en) * | 2013-05-21 | 2014-12-03 | 核动力运行研究所 | Outside cross type elastic coil eddy current probe |
| CN106198723A (en) * | 2016-07-07 | 2016-12-07 | 江苏方天电力技术有限公司 | A kind of detection device and method of bolt bottoming hole inner surface cracks |
| CN106645390A (en) * | 2015-11-04 | 2017-05-10 | 江苏爱福特科技开发有限公司 | Pin crack detection equipment |
| CN108132298A (en) * | 2018-02-02 | 2018-06-08 | 山东大学 | A kind of vertical retractable type eddy current probe and its application based on the detection of piston aditus laryngis |
| CN108843301A (en) * | 2018-07-04 | 2018-11-20 | 中国石油集团川庆钻探工程有限公司 | A kind of oil and gas extraction wellhead device on-line checking phased array scanner |
| CN110865119A (en) * | 2019-11-27 | 2020-03-06 | 白海燕 | Bolt detects and uses eddy current detector convenient to installation |
| CN111351847A (en) * | 2020-04-17 | 2020-06-30 | 中国飞机强度研究所 | Positioning guide device, annular probe eddy current detection system and detection method |
| RU198523U1 (en) * | 2020-01-28 | 2020-07-14 | Максим Владимирович Ковалев | A device for magnetic testing of transverse cracks in fasteners and shafts with threads made of ferromagnetic materials using the Hall effect |
| CN113155953A (en) * | 2021-04-19 | 2021-07-23 | 北京工业大学 | Vertical eddy current sensor for CFRP layered defect detection |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181227A (en) * | 2013-05-21 | 2014-12-03 | 核动力运行研究所 | Outside cross type elastic coil eddy current probe |
| CN104181227B (en) * | 2013-05-21 | 2017-02-08 | 核动力运行研究所 | Outside cross type elastic coil eddy current probe |
| CN103344745B (en) * | 2013-07-12 | 2015-07-15 | 爱德森（厦门）电子有限公司 | Device and method for automatically and spirally scanning inner wall of screw hole by eddy |
| CN103344745A (en) * | 2013-07-12 | 2013-10-09 | 爱德森（厦门）电子有限公司 | Device and method for automatically and spirally scanning inner wall of screw hole by eddy |
| CN103913509A (en) * | 2014-04-19 | 2014-07-09 | 中国人民解放军第五七二一工厂 | Defect detection method of paint aluminum alloy frame plate |
| CN103913509B (en) * | 2014-04-19 | 2016-02-10 | 中国人民解放军第五七二一工厂 | A kind of defect inspection method with paint aluminium alloy deckle board |
| CN106645390A (en) * | 2015-11-04 | 2017-05-10 | 江苏爱福特科技开发有限公司 | Pin crack detection equipment |
| CN106198723B (en) * | 2016-07-07 | 2023-07-28 | 江苏方天电力技术有限公司 | Detection device and method for cracks on inner wall of bolt heating hole |
| CN106198723A (en) * | 2016-07-07 | 2016-12-07 | 江苏方天电力技术有限公司 | A kind of detection device and method of bolt bottoming hole inner surface cracks |
| CN108132298A (en) * | 2018-02-02 | 2018-06-08 | 山东大学 | A kind of vertical retractable type eddy current probe and its application based on the detection of piston aditus laryngis |
| CN108843301A (en) * | 2018-07-04 | 2018-11-20 | 中国石油集团川庆钻探工程有限公司 | A kind of oil and gas extraction wellhead device on-line checking phased array scanner |
| CN108843301B (en) * | 2018-07-04 | 2024-03-29 | 中国石油集团川庆钻探工程有限公司 | Online detection phased array scanner for oil extraction wellhead device |
| CN110865119A (en) * | 2019-11-27 | 2020-03-06 | 白海燕 | Bolt detects and uses eddy current detector convenient to installation |
| RU198523U1 (en) * | 2020-01-28 | 2020-07-14 | Максим Владимирович Ковалев | A device for magnetic testing of transverse cracks in fasteners and shafts with threads made of ferromagnetic materials using the Hall effect |
| CN111351847A (en) * | 2020-04-17 | 2020-06-30 | 中国飞机强度研究所 | Positioning guide device, annular probe eddy current detection system and detection method |
| CN113155953A (en) * | 2021-04-19 | 2021-07-23 | 北京工业大学 | Vertical eddy current sensor for CFRP layered defect detection |
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Application publication date: 20101124 |