CN109632943B - High-precision eddy current inductor suitable for wheel - Google Patents
High-precision eddy current inductor suitable for wheel Download PDFInfo
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- CN109632943B CN109632943B CN201910007576.3A CN201910007576A CN109632943B CN 109632943 B CN109632943 B CN 109632943B CN 201910007576 A CN201910007576 A CN 201910007576A CN 109632943 B CN109632943 B CN 109632943B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9093—Arrangements for supporting the sensor; Combinations of eddy-current sensors and auxiliary arrangements for marking or for rejecting
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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Abstract
The invention discloses a high-precision eddy current sensor suitable for a wheel, which comprises an iron fixing sleeve, wherein the inner side of the iron fixing sleeve is provided with an annular opening for sleeving the wheel; the eddy current detection probe is divided into three sections and is respectively used for detecting the tread and two side surfaces of the wheel; the bracket is fixedly connected with the iron fixing sleeve; an engine, one end of which is connected with the wheel through a transmission shaft; the other end is connected with remote monitoring equipment; one end of the signal transmission system is connected with the eddy current detection probe through a wire, and the other end of the signal transmission system is connected with the remote monitoring equipment; the iron fixing sleeve consists of a first fixing sleeve body and a second fixing sleeve body; one side of the first fixed sleeve body, which is far away from the annular opening, is connected with the bracket; the first fixed sleeve body is rotatably connected with one end of the second fixed sleeve body, and the other end of the first fixed sleeve body is connected with the second fixed sleeve body in a buckling mode. The eddy current sensor is suitable for wheels, the eddy current detection probe lines are arranged, the precision is high, and the defect judgment is intuitive.
Description
Technical Field
The invention belongs to the field of nondestructive testing, and particularly relates to a high-precision eddy current sensor suitable for a wheel.
Background
With the rapid development of modern technologies, the types and the number of vehicles are more and more huge. People seek comfort experience and speed, and meanwhile, higher requirements are also put on safety and reliability of riding. The repair mode based on fault repair in Xiri can not meet the requirement of increasingly busy traffic on safety. The track and the wheel are subjected to spot inspection or periodic detection, and the maintenance mode is changed, so that the riding safety is developed towards the direction of integration and intellectualization, and the method becomes one of important means for guaranteeing the riding safety.
At present, the method for measuring the distance of the wheel defect mainly comprises four methods, namely ultrasonic, laser, image recognition and electric eddy current. The laser has high requirements on the smooth finish and the deflection angle of the reflecting surface, and the laser and the image recognition are easily influenced by the state of the wheel, such as large dust, oil stain and the like. However, ultrasonic inspection of a portion having a width of less than 50mm is difficult. The electric eddy current has good detection effect under the same condition. The traditional eddy current sensor adopts a single eddy current probe to calibrate and measure the repeated back and forth and step scanning of the invisible examined surface. The existing eddy current sensor mostly adopts an array type. The method adopts an electronic method, switches the array units in a time-sharing way according to a set logic program, scans all the array units one by one, and connects eddy current response signals acquired by all the units into a signal processing system together to finish the itinerant detection of one array. However, the array eddy current sensor needs a plurality of detection probes, which is not only a waste of resources, but also a plurality of detection probes generate certain interference when working with each other, thereby affecting the final accuracy.
In addition, because of the particular shape of the wheel, which has a tread and two sides, there is currently no eddy current sensor that detects the particular shape of the wheel.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an eddy current sensor which is annular as a whole and suitable for wheel detection.
In order to realize the purpose, the technical scheme provided by the invention is as follows:
a high precision eddy current sensor adapted for use in a vehicle wheel, comprising:
the iron fixing sleeve is provided with an annular opening close to the circle center side and is used for sleeving the wheel;
the eddy current detection probe is arranged on the inner side of the iron fixing sleeve, is divided into three sections and is respectively used for detecting the tread and two side surfaces of the wheel;
the bracket is fixedly connected with the iron fixing sleeve;
an engine, one end of which is connected with the wheels through a transmission shaft; the other end is connected with remote monitoring equipment;
one end of the signal transmission system is connected with the eddy current detection probe through a wire, and the other end of the signal transmission system is connected with the remote monitoring equipment;
the iron fixing sleeve consists of a first fixing sleeve body and a second fixing sleeve body; one side of the first fixed sleeve body, which is far away from the annular opening, is connected with the bracket; the first fixed sleeve body is rotatably connected with one end of the second fixed sleeve body, and the other end of the first fixed sleeve body is connected with the second fixed sleeve body in a buckling mode.
The eddy inductor integrally adopts an annular iron fixing sleeve with an annular opening, and the iron fixing sleeve is divided into two parts, one end of the iron fixing sleeve is rotatably connected, and the other end of the iron fixing sleeve is connected in a buckling manner, so that the wheel is sleeved. The eddy current sensor is characterized in that an eddy current detection probe is further arranged inside the annular opening of the eddy current sensor and is divided into three sections which are respectively used for detecting the tread and two side faces of the wheel, and when the iron fixing sleeve is unfolded to form a plane, the three sections of eddy current detection probes are in a straight line; the eddy current detection probes are arranged in a linear mode, so that the interference generated among the eddy current detection probes when the eddy current detection probes are arranged in an array mode is reduced, and the precision and the accuracy of the eddy current sensor are improved; one part of the eddy current inductor is connected with the bracket and used for fixing the eddy current inductor. The invention is also provided with an engine which is matched with the wire arrangement of the eddy current testing probe for use. One end of the remote monitoring device is connected with the wheels through a transmission shaft, and the other end of the remote monitoring device is connected with the remote monitoring device; because the eddy current inspection probes are arranged in a line, the defect condition of only one line of the wheel can be detected, after the engine is added, the engine enables the wheel sleeved with the eddy current sensor to rotate through the transmission shaft, and the eddy current inspection probes arranged in the line can scan the whole wheel.
As a preferred aspect of the present invention, the first fixing sleeve body includes a first connecting end and a first free end; the second fixed sleeve body comprises a second connecting end and a second free end; the first connecting end is provided with a first blind hole; the second connecting end is provided with a second blind hole; when the first connecting end is inserted into the second connecting end, the first blind hole and the second blind hole form a radial channel and are connected through a hinge shaft; a metal ring is arranged on the first free end; the second free end is provided with a convex part; when the iron fixing sleeve is sleeved on the wheel, the metal ring and the bulge are mutually buckled to play a role in fixed connection. It should be understood that other solutions, such as a switch using a reset structure, which can open and close the first connection end and the second connection end to put in the wheel and fix the iron fixing sleeve, are within the protection scope of the present invention.
As a preferable aspect of the present invention, the eddy current inspection probe is composed of a coil and a magnetic core; the magnetic core is T-shaped, and the coil is wound on the magnetic core. The magnetic core is T-shaped, and the phenomenon of magnetic flux leakage can be effectively reduced.
In a preferred embodiment of the present invention, the eddy current test probe has a diameter of 3 to 50mm. When the requirement on the accuracy of the detection result is not very high, an eddy current detection probe with a larger diameter can be selected for detection; when the requirement on the accuracy of the detection result is high, an eddy current detection probe with a smaller diameter can be selected for detection.
As a preferable scheme of the invention, the remote monitoring device comprises an electronic switching device which is used for controlling and changing the excitation frequency, the strength, the sequence and the filtering parameters of the coil in the eddy current detection probe; the scanning mode of the eddy current detection probe is single excitation/differential receiving scanning, and every three eddy current detection probes form a group.
According to the principle of the sensor, the sensor firstly needs an exciting coil, alternating current is conducted, and the periphery of the exciting coil and the interior of a detected workpiece are excited to form an electromagnetic field; meanwhile, in order to detect signals reflecting various characteristics of the workpiece under the action of an electromagnetic field, a receiving coil is also needed. The exciting coil and the receiving coil of the eddy current inductor can be two coils with different functions, and the same coil can have two functions of exciting and receiving. The eddy current detection probe of the invention does not adopt the traditional array type, but adopts the line arrangement. However, when the wires are arranged, interference exists between the coils in the left eddy current detection probe and the right eddy current detection probe. The electronic switching device is connected with the eddy current detection probe, and the excitation and receiving modes of the probe can be flexibly changed and switched. The excitation sequence can be various, for example, when a certain coil is excited, other adjacent excitation coils are not excited, only when the excitation of the certain excitation coil is finished, another adjacent excitation coil starts to be excited, and the excitation time sequence is provided with a certain interval time; alternatively, when a certain excitation coil is excited, the excitation coil is not adjacent to the certain excitation coil, that is, the excitation coil is simultaneously excited by 1 or more coils. The electronic switching device can also control the excitation frequency, intensity and filtering parameters of the coil. When a defect is detected, the coil without the detected defect can be not excited, and the excitation frequency and the excitation intensity of the coil of the section with the detected defect are increased so as to enhance the sensitivity of the coil to the defect. In the preferred embodiment, every third coil is grouped into one group. Because the eddy current inspection probe of the present invention is arranged in a line, the single excitation/differential receive scan is: the coil in the middle position is an exciting coil, and the coils on both sides are receiving coils.
As a preferable aspect of the present invention, the remote monitoring apparatus includes an imaging device and an acousto-optic alarm device; the sound and light alarm device is provided with 3 alarm threshold values. The imaging device can clearly present the defects detected by the eddy current detection probe, so that the defects can be judged more visually. The sound-light alarm device can perform sound-light alarm when the defect is higher than a certain numerical value by setting an alarm threshold value. The two are connected in parallel, namely, when one device fails, the other device can still continue to judge. The judgment of the wheel defect under special conditions is ensured. Further, the set threshold value is that H is less than 0.8mm, H is more than or equal to 0.8mm and less than 1.5mm; h is more than or equal to 1.5mm. In different threshold value ranges, different alarm sounds and indicator lights with different colors can be set for alarming.
As a preferable scheme of the invention, the device further comprises a temperature sensor; the iron fixing sleeve is provided with a through hole; the working end of the temperature sensor is inserted into the through hole and is fixed by rubber cement; a closed structure is arranged on the outer side of the temperature sensor; the temperature sensor is connected with the signal transmission system through a lead. The absolute eddy current detection probe can respond to sudden change or slow change of material performance or shape, the mixed signals are easy to distinguish, the whole length of the defect can be displayed, and the drift is easily generated under the influence of temperature change. A temperature sensor is arranged outside the iron fixing sleeve, and temperature compensation calculation is carried out through a signal transmission system, so that systematic errors are reduced.
As a preferable scheme of the present invention, the fixing device further comprises an infrared thermal imaging instrument connected to the signal transmission system for monitoring the surface temperature of the iron fixing sleeve. The infrared thermal imager mainly utilizes the infrared radiation characteristics of an object, can monitor the temperature of the surface of the object within the courseware range of a camera, and has the temperature difference of 0.05 ℃.
As a preferable scheme of the invention, the vehicle further comprises a wheel rotating speed sensor; the wheel speed sensor is connected with the signal transmission system through a lead. The wheel speed sensor is used for monitoring the wheel speed, the remote monitoring equipment controls the wheel speed by controlling the engine, and the wheel speed is set according to the diameter of the wheel and the diameter of the eddy current measuring probe.
As a preferred scheme of the invention, the outer surfaces of the iron fixing sleeve and the bracket are coated with one of perchloroethylene or high vinyl chloride anticorrosive paint. The iron fixing sleeve is easy to react with oxygen, water vapor and the like in the air, and the outer surface of the iron fixing sleeve is coated with anticorrosive paint, so that the corrosion phenomenon of the outer surface can be avoided, and the service life of the iron fixing sleeve is prolonged.
The invention has the advantages that:
1. the whole eddy current sensor adopts an annular structure, and an annular opening is arranged in the eddy current sensor, so that the eddy current sensor suitable for the shape of a wheel is provided, and the tread and the side surface of the wheel can be detected;
2. three sections of eddy current detection probes are arranged in the eddy current sensor, and the interference generated among the eddy current detection probes is reduced by adopting line arrangement, so that the precision and the accuracy of the eddy current sensor are improved; the engine is connected with the wheels, so that the wheels can be detected by a row of eddy current detection probes, and time and labor are saved;
3. and the vortex imaging device and the acousto-optic alarm device are connected to perform imaging display and acousto-optic alarm on the defects, so that the defects can be judged more visually.
4. The temperature sensor is arranged outside the iron fixing sleeve, and temperature compensation calculation is carried out through the signal transmission system, so that systematic errors are reduced.
Drawings
FIG. 1 is a schematic view of an eddy current inductor of the present invention;
FIG. 2 is a schematic view of a wheel assembled by a first fixing sleeve and a second fixing sleeve according to the present invention;
FIG. 3 is a partial schematic view of the iron fixation sleeve of the present invention when expanded;
FIG. 4 is a schematic illustration of an engine of the present invention;
FIG. 5 is a schematic view of a partial arrangement of eddy current test probes in accordance with the present invention;
FIG. 6 is a schematic view of a stent of the present invention;
FIG. 7 is a schematic view of the temperature sensor of the present invention inserted into the through hole of the iron fixture sleeve;
FIG. 8 is an enlarged schematic view of the first and second link ends;
FIG. 9 is a schematic view of an eddy current configuration sensor coil distribution;
FIG. 10 is a schematic diagram of a single excitation/differential reception scanning rule;
fig. 11 is a schematic imaging diagram.
Wherein, 1, iron fixing sleeves are made; 11. a first fixed sleeve body; 111. a first connection end; 1111. a first blind hole; 112. a first free end; 1121. A metal ring; 12. a second fixed sleeve body; 121 a second connection end; 1211. a second blind hole; 122. a second free end; 1221. a boss portion; 13. hinging shafts; 14. a through hole; 2. An eddy current inspection probe; 21. a magnetic core; 22. a coil; 3. a wire; 4. A support; 41. a top surface; 411. a curved surface; 42. a side surface; 43. a bottom surface; 5. an engine; 51. a drive shaft; 6. A signal transmission system; 7. A temperature sensor; 71. a working end; 72. a closed structure; 8. A wheel; 81. a tread; 82. a side surface; 9. and (5) a defect.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
As shown in fig. 1, a high-precision eddy current sensor for a vehicle wheel 8 includes: the iron fixing sleeve 1 is provided with an annular opening close to the circle center side and is used for sleeving the wheel 8; as shown in fig. 3, the eddy current testing probe 2 is arranged inside the iron fixing sleeve 1, and is divided into three sections, which are respectively used for testing the tread 81 and two side surfaces 82 of the wheel 8, and further, when the iron fixing sleeve 1 is unfolded into a plane, the three sections of eddy current testing probes 2 form a straight line; as shown in fig. 5. The bracket 4 is fixedly connected with the iron fixing sleeve 1; further, as shown in fig. 6, the rack 4 includes a top surface 41, a side surface 42, and a bottom surface 43; the width of the top surface 41 is not less than that of the tread 81 of the wheel 8 and not more than that of the bottom surface 43; at least a portion of the top surface 41 is curved 411. The bracket 4 is of a solid structure, preferably a metal structure with a relatively high density or wood, and the surface of the bracket is painted with corrosion-resistant paint. An engine 5, as shown in fig. 4, having one end connected to the wheel 8 through a transmission shaft 51; the other end is connected with remote monitoring equipment; one end of the signal transmission system 6 is connected with the lead 3 of the eddy current detection probe 2, and the other end of the signal transmission system is connected with the remote monitoring equipment; as shown in fig. 2, the iron fixing sleeve 1 is composed of a first fixing sleeve body 11 and a second fixing sleeve body 12; the side of the first fixed sleeve body 11, which is far away from the annular opening, is connected with the bracket 4; the first fixed sleeve body 11 is rotatably connected with one end of the second fixed sleeve body 12, and the other end of the first fixed sleeve body is connected with the other end of the second fixed sleeve body in a buckling mode.
As another embodiment of the present invention, the first fixing sleeve body includes a first connection end 111 and a first free end 112; the second fixed sleeve body 12 comprises a second connecting end 121 and a second free end 122; as shown in fig. 8, a first blind hole 1111 is formed at the first connection end 111; a second blind hole 1211 is formed in the second connecting end 121; when the first connection end 111 is inserted into the second connection end 121, the first blind hole 1111 and the second blind hole 1211 form a radial channel and are connected through a hinge shaft 13; a metal ring 1121 is arranged on the first free end 112; the second free end 122 is provided with a convex portion 1221; when the iron fixing sleeve 1 is sleeved on the wheel 8, the metal ring 1121 and the protruding portion 1221 are buckled with each other to play a role in fixing and connecting.
As another embodiment of the present invention, the eddy current inspection probe 2 is composed of a coil 22 and a magnetic core 21; the magnetic core 21 has a "T" shape, and the coil 22 is wound around the magnetic core 21, as shown in fig. 7. Further, the core 21 is a ferrite core 21; the coil 22 is wound on the ferrite core 21; the contact end face of the eddy current detection probe 2 and the wheel 8 is made of flexible materials, and the non-contact end face is made of magnetic field shielding materials. Preferably, the contact end face of the probe on the wheel 8 is made of wear-resistant flexible material, so that the service life of the probe is prolonged.
As another embodiment of the present invention, the eddy current inspection probe 2 has a diameter of 3 to 50mm.
As another embodiment of the invention, the remote monitoring device comprises electronic switching means for controlling and varying the excitation frequency, intensity, sequence and filtering parameters of the coils 22 in the eddy current testing probe 2; the scanning mode of the eddy current detection probe 2 is single excitation/differential receiving scanning, and every three eddy current detection probes 2 form a group. The eddy current inspection probe 2 of the present invention is not a conventional array type, but a line arrangement. However, when the wires are arranged, interference is caused between the coils 22 of the left and right eddy current inspection probes 2. The electronic switching device is connected with the eddy current detection probe, and the excitation and receiving modes of the probe can be flexibly changed and switched. The excitation sequence may be various, for example, when a certain coil 22 is excited, the other excitation coil 22 adjacent to the certain coil is not excited, and only after the excitation of the certain excitation coil 22 is finished, the other excitation coil 22 adjacent to the certain coil starts to be excited, and the excitation timing sequence is set to have a certain interval time; alternatively, when a certain excitation coil 22 is excited, the coils 22 which are not adjacent to the certain excitation coil 22, that is, which are spaced 1 or more apart from the certain excitation coil, are excited simultaneously. The electronic switching device may also control the excitation frequency, intensity, and filtering parameters of the coil 22. When a defect 9 is detected, the coil 22 in which the defect 9 is not detected may not be excited, and the excitation frequency and intensity of the coil 22 in a section in which the defect 9 is detected are increased to enhance the sensitivity thereof to the defect 9. Specifically, when a certain excitation coil 22 is excited, the other excitation coil 22 adjacent thereto is not excited, and only after the excitation of this excitation coil 22 is completed, the other excitation coil 22 adjacent thereto starts to be excited, and the excitation timing is set at a certain interval. As shown in fig. 10, A2 is an exciting coil 22, and A1 and A3 adjacent to A2 receive the exciting coil 22. As shown in fig. 9, when A2 is excited, the other coils 22 are not excited, and only after the excitation of the A2 coil 22 is completed, A5 starts the excitation, and the excitation timing is set to 0.1 second. The excitation coils 22 may be excited while coils 22 that are not adjacent to each other are used as the excitation coils 22. That is, in fig. 9, A2 is excited simultaneously with A5, a8.
As another embodiment of the invention, the remote monitoring device comprises an imaging device and an acousto-optic alarm device; the sound and light alarm device is provided with 3 alarm threshold values. When the acousto-optic alarm device is used, four alarm areas are set, wherein H is less than 0.4mm, H is less than 0.4mm and less than 0.8mm, H is less than 0.8mm and less than 1.2mm, and H is more than mm. Different alarm areas are set with different alarm sounds and different light colors, or different sound durations and light flashing times which can be obviously distinguished are distinguished. The imaging device can clearly and intuitively present an image of the defect 9 as shown in fig. 11.
As another embodiment of the present invention, a temperature sensor 7; the iron fixing sleeve 1 is provided with a through hole 13; the working end 71 of the temperature sensor 7 is inserted into the through hole 13 and fixed by rubber cement; a closed structure 72 is arranged outside the temperature sensor 7; the temperature sensor 7 is connected with the conducting wire 3 of the signal transmission system 6. The absolute eddy current probe reacts to sudden or slow changes in material properties or shape, the mixed signal is easily distinguishable, the entire length of the defect 9 is displayed, but drift is easily caused by temperature changes. A temperature sensor 7 is arranged outside the iron fixing sleeve 1, and temperature compensation calculation is carried out through a signal transmission system, so that systematic errors are reduced.
As another embodiment of the invention, the device further comprises an infrared thermal imager, which is connected with the signal transmission system 6 and is used for monitoring the surface temperature of the iron fixing sleeve 1. The infrared thermal imager can monitor the surface temperature of the iron fixing sleeve 1, and the temperature compensation calculation is carried out through the signal transmission system, so that the systematic error is reduced.
As another embodiment of the invention, the device also comprises a wheel 8 rotating speed sensor; the wheel 8 rotating speed sensor is connected with the signal transmission system 6 through the wire 3.
As another embodiment of the present invention, the outer surfaces of the iron fixing sleeve 1 and the bracket 4 are coated with one of perchloroethylene or high vinyl chloride anticorrosive paint.
The use method of the eddy current inductor comprises the following steps: the second fixed sleeve body 12 is taken up to rotate along the second connecting end 121, the wheel 8 is then placed in the first fixed sleeve body 11, the second fixed sleeve body 12 is rotated continuously to make the second free end 122 connected with the first free end 112 of the first fixed sleeve body 11, and then the metal ring 1121 is taken up to rotate to match with the raised portion 1221 on the second fixed sleeve body 12, so that the first fixed sleeve body 11 is sleeved and fixedly connected with the second fixed sleeve body 12. One end of the transmission shaft 51 is connected with the output end of the engine 5, and the other end is connected with the wheel 8. The power supply is turned on and the electronic switching device, imaging device and audible and visual alarm are turned on, which controls the excitation frequency, intensity, sequence and filtering parameters of the coils 22 in the eddy current test probe 2. At this moment, the wheel 8 slightly rotates, the rotating speed of the wheel 8 at this moment is transmitted to the remote monitoring equipment by the rotating speed sensor, and the remote monitoring equipment regulates and controls the rotating speed of the wheel 8 accordingly. The electronic switching device controls an oscillator module in the signal transmission system 6 to generate high-frequency oscillation current which flows into the probe coil 22 through the lead 3, and the coil 22 generates a high-frequency electromagnetic field. The coils 22 which are not adjacent to each other serve as excitation coils 22. The eddy current detection probe is connected with the oscillator module through a lead 3. When the iron fixing sleeve 1 is fitted to the wheel 8 to be detected, an induced current, i.e., an eddy current, is generated on the surface of the wheel 8 due to the action of the high-frequency magnetic field. This current generates an alternating magnetic field in a direction opposite to that of the magnetic field of the coil 22, which fields, superimposed on each other, change the impedance of the primary coil 22. The change of the distance between the coil 22 and the metal conductor is converted into a voltage or current change by the linear compensation module. The oscillator module converts (rectifies and filters) the alternating voltage signal output by the oscillator module into a direct voltage signal, and transmits the direct voltage signal to the detection module. A temperature sensor 7 is arranged outside the iron fixing sleeve 1, and temperature compensation calculation is carried out through a signal transmission system, so that systematic errors are reduced. And the transmission buffer stage module amplifies the direct-current voltage signal and transmits the amplified direct-current voltage signal to the imaging system. When the detected defect 9 is small, the excitation frequency and the intensity of the coil 22 of the eddy current inspection probe 2 where the defect 9 is small are increased by the electronic switching device. And after the detection is finished, recording and storing the image of the defect 9 in the imaging device, and turning off the imaging device, the audible and visual alarm, the electronic switching device and the power supply. The engine 5 and the transmission shaft 51 are stored after being detached, the metal ring 1121 is pulled up to be separated from the boss 1221, then the second stationary sleeve body 12 is taken up to be rotated along the second connecting end 121, the wheel 8 is taken out, and the second stationary sleeve body 12 is continuously rotated so that the second free end 122 is connected with the first free end 112 of the first stationary sleeve body 11. Finally, the iron fixing sleeve 1 is stored, stored and preserved for the next use.
Detection test
Taking 3 wheels 8, adopting a manual nicking mode to nick 75 scars on the surface, wherein the depth is between 0.001mm and 5mm in sequence, testing by using the eddy current sensor disclosed by the invention, and calibrating the probe of the eddy current sensor to be zero when no manual nicking exists. The value of the detected minimum defect 9 is 0.003mm through testing, and the value is the detection sensitivity of the eddy current sensor.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (1)
1. A high accuracy eddy current sensor adapted for use in a vehicle wheel, comprising: the iron fixing sleeve is provided with an annular opening close to the circle center and used for sleeving the wheel; the eddy current detection probe is arranged on the inner side of the iron fixing sleeve, is divided into three sections and is respectively used for detecting the tread and two side surfaces of the wheel; the bracket is fixedly connected with the iron fixing sleeve; an engine, one end of which is connected with the wheels through a transmission shaft; the other end is connected with remote monitoring equipment; one end of the signal transmission system is connected with the eddy current detection probe through a wire, and the other end of the signal transmission system is connected with the remote monitoring equipment; the iron fixing sleeve consists of a first fixing sleeve body and a second fixing sleeve body; one side of the first fixed sleeve body, which is far away from the annular opening, is connected with the bracket; one end of the first fixed sleeve body is rotatably connected with one end of the second fixed sleeve body, and the other end of the first fixed sleeve body is connected with the second fixed sleeve body in a buckling mode; the first fixed sleeve body comprises a first connecting end and a first free end; the second fixed sleeve body comprises a second connecting end and a second free end; a first blind hole is formed in the first connecting end; a second blind hole is formed at the second connecting end; when the first connecting end is inserted into the second connecting end, the first blind hole and the second blind hole form a radial channel and are connected through a hinge shaft; a metal ring is arranged on the first free end; the second free end is provided with a convex part; when the iron fixing sleeve is sleeved on the wheel, the metal ring and the bulge are mutually buckled to play a role in fixed connection, and the eddy current detection probe consists of a coil and a magnetic core; the magnetic core is T-shaped, the coil is wound on the magnetic core, the diameter of the eddy current detection probe is 3-50mm, and the remote monitoring equipment comprises an electronic switching device which is used for controlling and changing the excitation frequency, the intensity, the sequence and the filtering parameters of the coil in the eddy current detection probe; the eddy current detection probe scanning mode is single excitation/differential receiving scanning, every three eddy current detection probes form a group, and the remote monitoring equipment comprises an imaging device and an acousto-optic alarm device; the sound and light alarm device is provided with 3 alarm thresholds and also comprises a temperature sensor; the iron fixing sleeve is provided with a through hole; the working end of the temperature sensor is inserted into the through hole and is fixed by rubber cement; a closed structure is arranged on the outer side of the temperature sensor; the temperature sensor is connected with the signal transmission system through a lead, and the temperature sensor also comprises an infrared thermal imager, a wheel speed sensor and a signal transmission system, wherein the infrared thermal imager is connected with the signal transmission system and used for monitoring the surface temperature of the iron fixing sleeve; the wheel speed sensor is connected with the signal transmission system wire, and the iron fixing sleeve and the outer surface of the bracket are coated with one of perchloroethylene or high vinyl chloride anticorrosive paint.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910007576.3A CN109632943B (en) | 2019-01-04 | 2019-01-04 | High-precision eddy current inductor suitable for wheel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910007576.3A CN109632943B (en) | 2019-01-04 | 2019-01-04 | High-precision eddy current inductor suitable for wheel |
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| CN109632943A CN109632943A (en) | 2019-04-16 |
| CN109632943B true CN109632943B (en) | 2023-04-14 |
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| CN112684000A (en) * | 2021-01-15 | 2021-04-20 | 中国工程物理研究院激光聚变研究中心 | Eddy current detection device suitable for ball-type subassembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001074614A (en) * | 1999-09-01 | 2001-03-23 | Sunx Ltd | Tire inspecting apparatus |
| CN201203594Y (en) * | 2008-06-03 | 2009-03-04 | 林俊明 | Electromagnetic detection probe apparatus for double/multi-channel railway wheel |
| CN104280397B (en) * | 2013-07-01 | 2016-09-07 | 北京中研国辰测控技术有限公司 | A kind of eddy current video synthesis check and evaluation method of in-service rail tread fish scale crackle |
| CN103472138B (en) * | 2013-09-25 | 2017-01-11 | 北京新联铁科技股份有限公司 | Track vehicle rim and tread flaw detection probe assembly system |
| CN103487502B (en) * | 2013-09-26 | 2015-12-02 | 上海海事大学 | The eddy current array probe of detection of complex conductive structure surfaces defect and system |
| CN105806935B (en) * | 2016-05-27 | 2024-03-12 | 三峡大学 | Quick detection device for weld defects of large-scale metal round pipe |
| CN206766001U (en) * | 2017-01-05 | 2017-12-19 | 翟家怡 | A kind of tire iron nail safety check instrument |
| CN206695997U (en) * | 2017-03-31 | 2017-12-01 | 天津威衡自动化科技有限公司 | A kind of Electricmotor car wheel detects fixture |
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