CN113624832B - Steel cord defect detection system - Google Patents
Steel cord defect detection system Download PDFInfo
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- CN113624832B CN113624832B CN202111032892.XA CN202111032892A CN113624832B CN 113624832 B CN113624832 B CN 113624832B CN 202111032892 A CN202111032892 A CN 202111032892A CN 113624832 B CN113624832 B CN 113624832B
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- 230000007547 defect Effects 0.000 title claims description 85
- 238000001514 detection method Methods 0.000 title claims description 69
- 229910000831 Steel Inorganic materials 0.000 title claims description 25
- 239000010959 steel Substances 0.000 title claims description 25
- 239000004744 fabric Substances 0.000 claims description 206
- 230000033001 locomotion Effects 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000005856 abnormality Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 10
- 238000009826 distribution Methods 0.000 description 10
- 239000000758 substrate Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- 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
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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Abstract
本申请提供一种钢丝帘布缺陷检测系统，包括限位装置，用于对所述钢丝帘布进行限位，磁图像获取装置，用于获取钢丝帘布的磁图像信号，以及磁图像检测装置，用于根据所述磁图像信号对所述钢丝帘布的缺陷进行检测；所述限位装置包括对向设置于所述钢丝帘布两侧的多个限位轮，所述磁图像获取装置包括磁场单元、磁传感器模组和信号处理单元，所述磁场单元包括对向设置于所述钢丝帘布两侧的第一永磁体模组和第二永磁体模组。本申请提供的钢丝帘布磁图像信号检测系统能够基于穿过背景磁场的钢丝帘布引起所述背景磁场的变化情况生成所述钢丝帘布的磁图像信号并对所述磁图像信号进行检测。
The present application provides a steel cord defect detection system, including a limiting device for limiting the steel cord, a magnetic image acquisition device for acquiring a magnetic image signal of the steel cord, and a magnetic image detection device for detecting the defects of the steel cord according to the magnetic image signal; the limiting device includes a plurality of limiting wheels arranged oppositely on both sides of the steel cord, the magnetic image acquisition device includes a magnetic field unit, a magnetic sensor module and a signal processing unit, the magnetic field unit includes a first permanent magnet module and a second permanent magnet module arranged oppositely on both sides of the steel cord. The steel cord magnetic image signal detection system provided by the present application can generate a magnetic image signal of the steel cord and detect the magnetic image signal based on the change of the background magnetic field caused by the steel cord passing through the background magnetic field.
Description
Technical Field
The application relates to the field of industrial nondestructive detection, in particular to a detection system capable of generating and detecting a magnetic field image of a wirecord fabric.
Background
The wirecord fabric is an important component of the truck tire, and is composed of an outer rubber layer and wirecord wires wrapped in the rubber layer at equal intervals, and the wirecord wires are used as a truck tire belt layer to provide important support for reinforcing the structural strength and bearing of the truck tire. In the manufacturing process of the wirecord fabric, due to the influence of production equipment and process flow, the wirecords in the wirecord fabric may have uneven distribution phenomena such as bending, dislocation, disconnection, intersection and the like, if the distribution situation of the wirecords in the wirecord fabric cannot be detected in real time, the quality of the wirecord fabric is adversely affected, and the performance and the safety of the truck tire are directly affected.
The traditional technology for detecting the defects of the wirecord fabric is a nondestructive detection method based on X rays, and the method is gradually replaced by a more economical, safe and convenient technical scheme due to high equipment cost and harm to the body of operators.
An alternative technical solution is a steel wire cord fabric defect detection technology based on a magnetic field, which utilizes the magnetic field change caused by the movement of the steel wire relative to the magnetic field to detect the defect of the steel wire cord fabric. However, the existing steel wire cord fabric defect detection device based on magnetic fields has the following general problems:
1. The used magnetic field detection unit is composed of a common magnetic head and a coil, the volume of the magnetic field detection unit is often far longer than the arrangement period of steel wires in the wirecord fabric, the detected magnetic field change is the result of superposition of magnetic field changes caused by a plurality of steel wires, so that the detection result has low precision, the problems of missing detection, wrong detection and the like, and the processing steps of missing detection and wrong detection are required to be additionally arranged, thereby being not beneficial to detecting the defects of the wirecord fabric in real time.
2. Because the magnetic field used for detecting the magnetic force lines at the edge is unevenly distributed and scattered in direction, the magnetic field is easily influenced by external magnetic interference, the influence on the precision of a detection result is large, and the problems of false alarm and the like are easily caused.
3. The existing steel wire cord defect detection technology based on magnetic field variation can only detect whether the arrangement interval of the steel wires along the moving direction is uniform according to the analysis of the periodic variation of the magnetic field, and can not detect defects such as bending, dislocation, disconnection, crossing and the like of the steel wires in a two-dimensional space.
The application is provided for solving the problems existing in the steel wire cord fabric defect detection technology.
Disclosure of Invention
The application aims to provide a system capable of accurately generating magnetic image signals of a wirecord fabric in real time and detecting defects of the wirecord fabric according to the magnetic image signals.
The application can be realized by the following technical scheme:
A wire curtain defect detection system is used for generating magnetic image signals of a wire curtain and detecting defects of the wire curtain according to the magnetic image signals, and comprises a limiting device, a magnetic image acquisition device and a magnetic image detection device, wherein the limiting device is used for limiting the wire curtain, the magnetic image acquisition device is used for generating magnetic image signals of the wire curtain, the magnetic image detection device is used for detecting the defects of the wire curtain according to the magnetic image signals, the limiting device comprises limiting wheels which are oppositely arranged on two sides of the wire curtain, the number of the limiting wheels on each side of the wire curtain is not less than two and are distributed at intervals along the moving direction of the wire curtain, the magnetic image acquisition device comprises a magnetic field unit, a magnetic sensor module and a signal processing unit, the magnetic field unit is used for generating a background magnetic field, the connecting line of the first permanent magnet module and the second permanent magnet module which are oppositely arranged on two sides of the wire curtain is perpendicular to the surface of the wire curtain, the background magnetic field comprises magnetic field lines which vertically penetrate through the wire curtain between the first permanent magnet module and the second permanent magnet module, and the magnetic field module is used for acquiring the magnetic field signals of the wire curtain, and the magnetic field line signal is used for processing the wire curtain.
Further, the distance between the edge of the limit wheel facing one side of the wirecord fabric and the wirecord fabric is smaller than 5mm.
Further, the distance between the surface of the first permanent magnet module facing the side of the wirecord fabric and the wirecord fabric is larger than the distance between the edge of the limiting wheel facing the side of the wirecord fabric and the wirecord fabric, and the distance between the surface of the second permanent magnet module facing the side of the wirecord fabric and the wirecord fabric is larger than the distance between the edge of the limiting wheel facing the side of the wirecord fabric and the wirecord fabric.
Further, the first permanent magnet module comprises a permanent magnet or a plurality of permanent magnets which are arranged at intervals along the direction perpendicular to the movement direction of the wirecord fabric, and the second permanent magnet module comprises a permanent magnet or a plurality of permanent magnets which are arranged at intervals along the direction perpendicular to the movement direction of the wirecord fabric.
Preferably, the first permanent magnet module further comprises a first magnetic conduction plate, the first magnetic conduction plate is arranged on the surface of the first permanent magnet module, facing one side of the wirecord fabric, the second permanent magnet module further comprises a second magnetic conduction plate, the second magnetic conduction plate is arranged on the surface of the second permanent magnet module, facing one side of the wirecord fabric, and the first magnetic conduction plate and the second magnetic conduction plate are made of magnetic conduction materials.
The magnetic sensor module comprises a plurality of magnetic sensors which are arranged at intervals along the direction perpendicular to the movement direction of the wirecord fabric and used for acquiring and outputting magnetic field signals of the wirecord fabric at the positions of the magnetic sensors, wherein the magnetic field signals of the wirecord fabric at the positions of the magnetic sensors are electric signals, and the control chip comprises a plurality of input ends and an output end, the plurality of input ends are connected with the plurality of magnetic sensors in a one-to-one correspondence manner, the output ends are used for outputting the magnetic field signals of the wirecord fabric, and the magnetic field signals of the wirecord fabric are serial electric signals.
Further, the magnetic sensor module is arranged between the connecting lines of the first permanent magnet module and the second permanent magnet module, and the distance between the surface of the magnetic sensor module facing one side of the wirecord fabric and the wirecord fabric is larger than the distance between the edge of the limiting wheel facing one side of the wirecord fabric and the wirecord fabric.
Further, the signal processing unit comprises an AD conversion module, a data processing module and a data transmitting module, wherein the AD conversion module is connected with the control chip and used for converting the magnetic field signal of the wirecord fabric into the digital magnetic field signal of the wirecord fabric, the data processing module is connected with the AD conversion module and used for processing the digital magnetic field signal of the wirecord fabric to generate the magnetic image signal of the wirecord fabric, and the data transmitting module is used for transmitting the magnetic image signal of the wirecord fabric.
Further, the magnetic image detection device comprises a defect detection unit, a display unit, a calculation unit, an execution processing unit and a main control unit, wherein the defect detection unit is used for generating a defect detection result of the wirecord fabric according to a magnetic image signal of the wirecord fabric, the defect detection result comprises a defect type and position information of a defect, the display unit is used for displaying the magnetic image signal of the wirecord fabric and the defect detection result of the wirecord fabric, the calculation unit is used for determining defect mark information according to the defect detection result of the wirecord fabric and the movement speed of the wirecord fabric, the defect mark information comprises mark position information and mark triggering time, the execution processing unit is used for carrying out defect marking according to the defect mark information, the alarm unit is used for carrying out abnormal alarm, and the main control unit is connected with the data transmission module and used for receiving the magnetic image signal of the wirecord fabric and controlling the defect detection unit, the display unit, the calculation unit, the execution processing unit and the alarm unit.
Preferably, the wirecord fabric defect detection system further comprises a first frame body and a second frame body, wherein the first frame body is used for placing and fixing the first permanent magnet module, the second frame body is used for placing and fixing the second permanent magnet module, the magnetic sensor module and the signal processing unit, and the surfaces of the first frame body and the second frame body, which face one side of the wirecord fabric, are cover plates.
The wirecord fabric magnetic image signal detection system provided by the embodiment of the application has at least the following beneficial effects:
1. The first permanent magnet module and the second permanent magnet module are arranged oppositely, so that the distribution of magnetic lines of force of a background magnetic field is more uniform, the uniformity of the magnetic lines of force is good, and especially, the steel wires which are arranged periodically and can pass through the steel wire curtain can cut the magnetic lines of force at a vertical angle near the steel wire curtain, thereby the change of the magnetic field caused by the movement of the steel wires is more obvious, and the signal to noise ratio of the change of the magnetic field is effectively improved.
2. The limiting wheel with a certain distance from the wirecord fabric is arranged, so that the wirecord fabric has a certain movement space at the detection position under the condition that the wirecord fabric is not contacted with the magnetic field acquisition device, and at the moment, the magnetic force lines uniformly and vertically pass through the plane of the wirecord fabric, so that the precision of the detected magnetic field change signal is unchanged, the limiting wheel does not press the wirecord fabric, and the abrasion on the surface of the wirecord fabric can be effectively avoided.
3. The magnetic sensor module is composed of a plurality of magnetic sensors, so that the detection breadth is effectively increased, the change signals of the background magnetic field acquired by the magnetic sensors are converted into two-dimensional magnetic image signals of the steel wire cord, and the capability of detecting the defects of bending, staggering, disconnection, crossing and the like of the steel wire cord on a two-dimensional plane can be increased on the basis of analyzing the one-dimensional periodic arrangement condition of the steel wire cord.
Drawings
FIG. 1 is an electrical schematic diagram of a magnetic sensor acquiring a magnetic field signal;
FIG. 2 is a block diagram of the system components of a wirecord magnetic image signal detection system according to an embodiment of the present application;
FIG. 3 is an assembled perspective view of a preferred implementation of an embodiment of the present application;
FIG. 4 is an assembled side view of a preferred implementation of an embodiment of the present application;
FIG. 5 shows the distribution of magnetic field lines of a background magnetic field according to an embodiment of the present application;
FIG. 6 shows the distribution of field lines of a background magnetic field according to an embodiment of the present application;
FIG. 7 is a preferred implementation of a first permanent magnet module of an embodiment of the present application;
FIG. 8 is a perspective view of a magnetic sensing module and signal processing unit of a preferred implementation of an embodiment of the present application;
FIG. 9 is an electrical schematic diagram of a magnetic sensor module according to an embodiment of the present application;
FIG. 10 is an electrical schematic diagram of a magnetic sensing module of a preferred implementation of an embodiment of the present application;
FIG. 11 is a flowchart illustrating an embodiment of a signal processing unit;
FIG. 12 is a magnetic image signal of a wirecord fabric generated by a signal processing unit in accordance with an embodiment of the present application;
FIG. 13 is a flowchart of the operation of a magnetic image sensing device according to an embodiment of the present application;
FIG. 14 is a schematic representation of marking defect locations on a magnetic image signal of a wirecord fabric in accordance with an embodiment of the present application.
Reference numerals in the figures
11 Limit wheels, 211 first permanent magnet modules, 212 second permanent magnet modules, 213 first magnetic conduction plates, 214 second magnetic conduction plates, 221 magnetic sensor modules, 2210 magnetic sensor elements, 2211 control chips, 23 signal processing units, 41 wireropes, 51 first frames, 52 second frames, 53 cover plates, 61 first circuit substrates, 62 second circuit substrates and 70 signal connecting wires.
Detailed Description
The present application will be further described below based on preferred embodiments with reference to the accompanying drawings.
In addition, various components on the drawings have been enlarged (thick) or reduced (thin) for ease of understanding, but this is not intended to limit the scope of the application.
The singular forms also include the plural and vice versa.
In the description of the embodiments of the present application, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship conventionally put in use of the embodiments of the present application are merely for convenience of describing the present application and simplifying the description, it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, in the description of the present application, the terms first, second, etc. are used herein for distinguishing between different elements, but not necessarily for limiting the order of manufacture, and should not be construed as indicating or implying any relative importance, since the names may be different in the detailed description of an embodiment of the present application and the claims.
The terminology used in the description presented herein is for the purpose of describing embodiments of the application and is not intended to be limiting of the application. It should also be noted that unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, directly connected, indirectly connected via an intermediate medium, or communicating between two elements. The foregoing will be particularly understood by those skilled in the art to which the application pertains.
For better illustrating the technical solution of the embodiment of the present application, we first describe the principle of acquiring magnetic field signals by the magneto-sensitive element with reference to fig. 1.
Fig. 1 is an electrical schematic diagram of a magnetic sensor for acquiring a magnetic field signal, and as shown in fig. 1, the magnetic sensor is a sensor capable of sensing a magnetic field and converting the magnetic field signal into an electrical signal for output, and includes a magnetic resistor and a reference resistor connected in series, wherein the resistance value Rs of the magnetic resistor changes with the change of the magnetic field sensed, and the resistance value Rf of the reference resistor is a constant value.
When a magnetic field signal needs to be acquired, the magneto-sensitive element is placed in a background magnetic field, as shown in fig. 1, a voltage VDD is applied to one end of the magneto-sensitive element, the other end of the magneto-sensitive element is grounded, and meanwhile, an output voltage Vo is led out from between the magneto-sensitive resistor and the reference resistor. At this time, the resistance Rs of the magneto-resistor is the resistance corresponding to the background magnetic field, and according to the voltage division principle, vo=vdd×rf/(rf+rs), the output voltage signal Vo is the signal reflecting the background magnetic field.
When an object containing magnetic materials approaches and enters a background magnetic field, the motion of the magnetic materials causes the change of the background magnetic field, so as to further cause the change of Rs and further cause the change of an output voltage signal Vo, and the output voltage signal Vo at the moment is a magnetic field signal reflecting the change of the position of each magneto-sensitive element.
In practical manufacturing and use, in order to obtain a wide magnetic field signal, a plurality of magnetic sensors are generally arranged at intervals along a preset direction, and the magnetic field signals output by the plurality of magnetic sensors are processed in parallel to serial, and are output in the form of serial magnetic field signals.
Specific implementations of embodiments of the present application are described in detail below in conjunction with fig. 2-14.
Fig. 2 is a system block diagram of an embodiment of the present application, fig. 3 is an assembled perspective view of a preferred embodiment of an embodiment of the present application (not including a magnetic image detection device in the drawings), and fig. 4 is an assembled side view of a preferred embodiment of an embodiment of the present application (not including a magnetic image detection device in the drawings).
As shown in fig. 2 to 4, an embodiment of the present application provides a wire-cord-fabric defect detection system for generating a magnetic image signal of a wire cord fabric and detecting a defect of the wire cord fabric according to the magnetic image signal, including a limiting device for limiting the wire cord fabric 41, a magnetic image acquisition device for generating a magnetic image signal of the wire cord fabric 41, and a magnetic image detection device for detecting a defect of the wire cord fabric according to the magnetic image signal.
The following describes in detail a specific implementation of the limiting device according to the embodiment of the present application with reference to fig. 3 and 4.
As shown in fig. 3 and 4, the limiting device includes limiting wheels 11 (for clarity of illustration, the wirecord 41 is represented by steel cords periodically distributed in the wirecord) disposed opposite to two sides of the wirecord 41, and the number of limiting wheels 11 disposed on each side of the wirecord 41 is not less than two and is distributed at intervals along the movement direction of the wirecord 41.
Further, the distance between the edge of the limiting wheel 11 facing the side of the wirecord fabric 41 and the wirecord fabric 41 is smaller than 5mm, and the distance between the edge of the limiting wheel 11 facing the side of the wirecord fabric 41 and the wirecord fabric 41 is set, so that the limiting wheel 11 keeps limiting the wirecord fabric 41 in a non-contact manner, and the wirecord fabric 41 is not pressed, and abrasion of the surface of the wirecord fabric caused by the magnetic image acquisition device can be effectively avoided.
Hereinafter, a specific implementation of the magnetic image acquisition apparatus according to the embodiment of the present application will be described in detail with reference to fig. 2 to 11.
As shown in fig. 2 to 4, the magnetic image acquisition device includes a magnetic field unit, a magnetic sensor module 221, and a signal processing unit 23.
As shown in fig. 4, the magnetic field unit is configured to generate a background magnetic field, and the background magnetic field includes a first permanent magnet module 211 and a second permanent magnet module 212 opposite to each other, where the connection line between the first permanent magnet module 211 and the second permanent magnet module 212 is perpendicular to the surface of the wirecord fabric 41, and the magnetic field includes magnetic lines of force between the first permanent magnet module 211 and the second permanent magnet module 212, which perpendicularly pass through the wirecord fabric 41.
Further, as shown in fig. 4, the distance between the surface of the first permanent magnet module 211 facing the wirecord fabric 41 and the wirecord fabric 41 is greater than the distance between the edge of the limit wheel 11 facing the wirecord fabric 41 and the wirecord fabric 41, and the distance between the surface of the second permanent magnet module 212 facing the wirecord fabric 41 and the wirecord fabric 41 is greater than the distance between the edge of the limit wheel 11 facing the wirecord fabric 41 and the wirecord fabric 41.
Further, the first permanent magnet module 211 comprises one permanent magnet or a plurality of permanent magnets arranged at intervals in a direction perpendicular to the movement direction of the wirecord fabric, and the second permanent magnet module 212 comprises one permanent magnet or a plurality of permanent magnets arranged at intervals in a direction perpendicular to the movement direction of the wirecord fabric.
Preferably, as shown in fig. 4, the first permanent magnet module 211 further comprises a first magnetic conductive plate 213, the first magnetic conductive plate is arranged on the surface of the first permanent magnet module 211 facing the wirecord fabric 41, the second permanent magnet module 212 further comprises a second magnetic conductive plate 214, the second magnetic conductive plate 214 is arranged on the surface of the second permanent magnet module 212 facing the wirecord fabric 41, and the first magnetic conductive plate 213 and the second magnetic conductive plate 214 are made of magnetic conductive materials.
In a specific implementation manner of the embodiment of the present application, the first magnetic conduction plate 213 and the second magnetic conduction plate 214 may be made of materials such as iron plates, ferrite plates, permalloy plates and/or silicon steel plates, and are used for guiding magnetic lines of force of the background magnetic field generated by the first permanent magnet module 211 and the second permanent magnet module 212, so that the distribution of the intensity and the direction of the magnetic lines of force is more uniform.
Fig. 5 shows the distribution of magnetic lines of the background magnetic field in the embodiment of the present application, and fig. 6 shows the distribution of magnetic lines of the background magnetic field when the permanent magnet modules are provided only on one side of the wirecord fabric 41, by contrast.
Comparing fig. 5 and 6, it can be seen that, since the first permanent magnet module 211 and the second permanent magnet module 212 are disposed opposite to each other on both sides of the wirecord fabric 41, the magnetic lines of the background magnetic field generated by the first permanent magnet module 211 and the second permanent magnet module 212 are more concentrated and distributed on the connecting line of the first permanent magnet module 211 and the second permanent magnet module 212, and are perpendicular to the movement plane of the wirecord fabric 41. By using the arrangement mode of the magnetic field module provided by the embodiment of the application, the distribution of magnetic lines of force of a background magnetic field can be more uniform and concentrated in the direction perpendicular to the moving direction of the wirecord fabric 41, so that the wirecord in the wirecord fabric 41 can cut the magnetic lines of force vertically, the variation amplitude of the background magnetic field when the wirecord fabric 41 moves is greatly increased, and the signal-to-noise ratio of the acquired magnetic field signal is effectively improved.
According to the technical scheme provided by the embodiment of the application, the magnetic force lines of the background magnetic field are concentrated in the direction perpendicular to the moving direction of the wirecord fabric 41, so that even if the wirecord fabric 41 is displaced in the direction perpendicular to the moving direction by the magnetic attraction force of the magnetic field unit, the influence on the accuracy of the acquired magnetic field signal is smaller, meanwhile, the wirecord fabric 41 cannot be adsorbed on the magnetic field unit by arranging the limiting wheel 11 to be closer to the wirecord fabric 41, and the wirecord fabric 41 is not required to be limited in a manner of compacting the wirecord fabric 41 on the basis of ensuring the accuracy of the acquired magnetic field signal, so that the damage to the surface of the wirecord fabric 41 is avoided.
Preferably, the first permanent magnet module 211 has a cross-sectional width toward the side of the wirecord fabric 41 smaller than the spacing between adjacent wirecords of the wirecord fabric 41, and the second permanent magnet module 212 has a cross-sectional width smaller than the spacing between adjacent wirecords of the wirecord fabric 41.
Specifically, as shown in fig. 7, in a preferred embodiment of the present application, the cross-sectional shape of the first permanent magnet module 211 may be set to be a trapezoid gradually shrinking toward the wirecord 41 and having a cross-sectional width toward the wirecord 41 side smaller than the pitch of the adjacent steel cords, and the cross-sectional shape of the second permanent magnet module 212 may be set to be a rectangle and having a cross-sectional width smaller than the pitch of the adjacent steel cords of the wirecord 41.
In other implementations of the embodiments of the present application, the cross-sectional shape of the first permanent magnet module 211 may also be configured as a tapered shape or other tapered shape that tapers toward the wirecord fabric 41.
By setting the widths of the sections of the first permanent magnet module 211 and the second permanent magnet module 212 facing the side of the wirecord fabric 41 to be smaller than the distance between adjacent wirecords and further setting the sections of the first permanent magnet module 211 to be gradually contracted trapezoidal or wedge-shaped, distribution of magnetic force lines of a background magnetic field can be concentrated in one interval period of the wirecord, interference of movement of the wirecord outside a detection area on a change signal of the background magnetic field acquired by the magnetic sensor can be greatly reduced, the change signal of the background magnetic field acquired by the magnetic sensor is more sensitive to movement of the wirecord positioned in the detection area, and accuracy of the change signal of the background magnetic field acquired by the magnetic sensor can be effectively improved.
Fig. 8 is a perspective view of the magnetic sensor module 221 and the signal processing unit 23 (for more clarity, the shaded portion is shown by a dashed line) according to an embodiment of the present application, and fig. 9 is an electrical schematic diagram of the magnetic sensor module according to an embodiment of the present application.
As shown in fig. 4, 8 and 9, the magnetic sensor module 221 includes a plurality of magnetic sensors 2210 arranged at intervals along a direction perpendicular to the movement direction of the wirecord fabric, for acquiring and outputting magnetic field signals of the wirecord fabric 41 at the positions of the magnetic sensors 2210, wherein the magnetic field signals of the wirecord fabric 41 at the positions of the magnetic sensors 2210 are electric signals, and the control chip 2211 includes a plurality of input ends and an output end, the plurality of input ends are connected with the plurality of magnetic sensors 2210 in a one-to-one correspondence manner, and the output ends are used for outputting the magnetic field signals of the wirecord fabric, wherein the magnetic field signals of the wirecord fabric 41 are serial electric signals.
Further, the magnetic sensor module 221 is disposed between the connection lines of the first permanent magnet module 211 and the second permanent magnet module 212, and the distance between the surface of the magnetic sensor module 221 facing the wire curtain 41 and the wire curtain 41 is greater than the distance between the edge of the limit wheel 11 facing the wire curtain 41 and the wire curtain 41.
In a specific implementation manner of the embodiment of the present application, as shown in fig. 8 and 9, the plurality of magnetic sensors 2210 are located in a background magnetic field, and are arranged at intervals in a direction perpendicular to a movement direction of the wirecord fabric 41, magnetic field signals of the sensed wirecord fabric 41 at the position are output to the control chip 2211 in the form of electric signals Vo through the signal connection line 70, the control chip 2211 includes a plurality of input terminals for inputting the magnetic field signals Vo of the plurality of magnetic sensors 2210, the control chip 2211 further includes a clock signal terminal for receiving the clock signal CLK and a start signal terminal for receiving the start signal SI, and after the start signal SI is received by the control chip 2211, the magnetic field signals Vo acquired by the plurality of magnetic sensors 2210 are sequentially read under the synchronization of the clock signal CLK, and are subjected to parallel-serial processing, so as to form the magnetic field signals Vout of the serial wirecord fabric, and are output to the signal processing unit 23 through the output terminals.
Fig. 10 is an electrical schematic diagram of another specific embodiment of the magnetic image capturing device according to the embodiment of the present application, in which, in order to expand the detection width, a plurality of magnetic sensor modules 221 may be arranged and connected at intervals in a direction perpendicular to the movement direction of the wirecord fabric 41, and after receiving the start signal SI, the plurality of magnetic sensor modules sequentially output the magnetic field signal Vout of the wirecord fabric to the signal processing unit 23 in synchronization with the clock signal CLK.
The following describes in detail the specific implementation of the signal processing unit 23 in connection with the workflow diagram of the signal processing unit 23 of the embodiment of the present application of fig. 11.
As shown in fig. 11, the signal processing unit 23 includes an AD conversion module connected to the control chip 2211 for converting the magnetic field signal of the wirecord fabric into the digital magnetic field signal of the wirecord fabric 41, a data processing module connected to the AD conversion module for processing the digital magnetic field signal of the wirecord fabric 41 to generate the magnetic image signal of the wirecord fabric 41, and a data transmitting module for transmitting the magnetic image signal of the wirecord fabric 41.
Specifically, in a specific implementation manner of the embodiment of the application, the AD conversion module may be an 8-bit analog-to-digital conversion chip, which is connected with the control chip 2211 through the signal connection line 70, and converts the magnetic field signal Vout of the serial wirecord fabric 41 into the digital magnetic field signal Dout of the serial wirecord fabric 41 with the output interval of 0-255 (256 steps in total);
the data processing module may include a clock signal interface to convert the digital magnetic field signal Dout of the wirecord fabric 41 into the magnetic image signal Dimage of the wirecord fabric 41 in synchronization with the clock signal CLK;
The data transmission module transmits the magnetic image signal Dimage of the wirecord fabric 41 to the magnetic image detection device in a wired or wireless manner.
Fig. 12 shows a magnetic image signal generated by the signal processing unit in the embodiment of the present application.
In a preferred implementation of the embodiment of the application, a correction module may be further provided between the AD conversion module and the data processing module for correcting the digital magnetic field signal Dout of the wirecord fabric 41.
A preferred implementation of the magnetic image acquisition apparatus according to the embodiment of the present application will be described below with reference to fig. 3 to 5.
As shown in fig. 3 to 5, the wirecord fabric defect detection system according to the embodiment of the present application further includes a first frame 51 and a second frame 52, where the first frame 51 is used for placing and fixing the first permanent magnet module 211, the second frame 52 is used for placing and fixing the second permanent magnet module 212, the magnetic sensor module 221 and the signal processing unit 23, and the surfaces of the first frame 51 and the second frame 52 facing the wirecord fabric 41 are cover plates 53.
Specifically, as shown in fig. 5, in a preferred embodiment of the present embodiment, the first frame 51 and the second frame 52 are disposed opposite to each other on both sides of the wirecord fabric 41; the first permanent magnet module 211 is fixedly arranged in the first frame body 51, the first magnetic conduction plate 213 is arranged on the surface of the first permanent magnet module 211 facing the wirecord fabric 41, the second permanent magnet module 212 is fixedly arranged in the second frame body 52, the second magnetic conduction plate 214 is arranged on the surface of the second permanent magnet module 213 facing the wirecord fabric 41, the plurality of magnetic sensors 2210 and the control chip 2211 are respectively packaged on the side of the first circuit substrate 61 facing the wirecord fabric 41 and the side facing away from the wirecord fabric 41, the plurality of magnetic sensors 2210 are arranged between the connecting lines of the first permanent magnet module 211 and the second permanent magnet module 212, the first circuit substrate 61 is fixedly arranged in the second frame body 52 and is positioned on the surface of the second magnetic conduction plate 214 facing the wirecord fabric 41, the signal processing unit 23 is packaged on the second circuit substrate 62 and is connected with the control chip 2211 through signal connecting lines 70 (the signal connecting lines 70 are not shown in fig. 4), the second circuit substrate 62 is fixedly arranged on the side of the second frame body 52 facing away from the wirecord fabric 41, the surface of the frame body 51 and the frame body 52 facing the wirecord fabric 41 is a cover 53, the cover 53 is made of a material with high wear resistance compared with the wire cord fabric 41, and the wear resistance is used for protecting the wirecord fabric 41, and the magnetic sensor is made of the first magnetic sensor module 211.
A specific implementation of the magnetic image detection device according to the embodiment of the present application will be described in detail below with reference to fig. 13 and 14.
Fig. 13 is a system block diagram of a magnetic image detecting apparatus, as shown in fig. 13, including a defect detecting unit for generating a defect detecting result of a wire rope 41 from a magnetic image signal of the wire rope 41, the defect detecting result including a defect type and position information of the defect, a display unit for displaying the magnetic image signal of the wire rope 41 and the defect detecting result of the wire rope 41, a calculating unit for determining defect marking information including marking position information and marking trigger time from the defect detecting result of the wire rope 41 and a moving speed of the wire rope 41, an execution processing unit for performing defect marking from the defect marking information, an alarm unit for performing abnormality alarm, and a main control unit connected to a data transmitting module for receiving the magnetic image signal of the wire rope 41 and controlling the defect detecting unit, the display unit, the calculating unit, the execution processing unit, and the alarm unit.
In a specific implementation manner of the embodiment of the present application, the main control unit may be a main processor in a desktop computer or a notebook computer, and communicates with the defect detection unit, the display unit, the calculation unit, the execution processing unit, and the alarm unit by reading and running a control program in a storage device such as a hard disk or an optical disk, and controls the units to execute respective workflows.
The main control unit receives the magnetic image signal Dimage transmitted by the data transmission module of the signal processing unit 23 through a wired data interface or a wireless transmission data interface.
The defect detection unit analyzes defects such as positional deviation, bending, breaking, crossing, and the like of the periodically arranged steel cords included therein based on the magnetic image signal Dimage of the steel cord 41 displayed in the two-dimensional gray scale pattern, and generates a defect detection result including defect type and position information of the defects.
The display unit displays the magnetic image signal and the defect detection result, and can be a desktop computer display, a notebook computer or a screen of a tablet computer. Fig. 14 shows a magnetic image signal of the wirecord fabric 41 including the defect detection result displayed by the display unit in an embodiment of the present application.
The calculation unit acquires the defect detection result generated by the defect detection unit, determines defect marking information such as a marking position and a marking trigger time required for marking a defect by the execution processing unit according to the movement speed of the wirecord fabric 41, and transmits the defect marking information to the execution processing unit.
The execution processing unit can be a mechanical arm with a marking function and other devices, can perform two-dimensional movement in the horizontal direction and up-and-down movement in the vertical direction, and marks the marking position at the marking triggering time after receiving the defect marking information.
The alarm unit gives an alarm when detecting the defect of the wirecord fabric 41 by means of sound, light, image and the like.
While the foregoing is directed to embodiments of the present application, other and further embodiments of the application may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. The utility model provides a wire curtain cloth defect detection system for generating the magnetic image signal of wire curtain cloth and according to the magnetic image signal detects wire curtain cloth's defect, includes stop device, is used for spacing wire curtain cloth, magnetic image acquisition device, is used for generating the magnetic image signal of wire curtain cloth, and magnetic image detection device, is used for according to the magnetic image signal detects wire curtain cloth's defect, its characterized in that:
The limiting device comprises limiting wheels which are oppositely arranged at two sides of the wirecord fabric, wherein the number of the limiting wheels at each side of the wirecord fabric is not less than two and the limiting wheels are distributed at intervals along the movement direction of the wirecord fabric;
The magnetic image acquisition device comprises a magnetic field unit, a magnetic sensor module and a signal processing unit;
The magnetic field unit is used for generating a background magnetic field and comprises a first permanent magnet module and a second permanent magnet module which are oppositely arranged at two sides of the wirecord fabric, the connecting line of the first permanent magnet module and the second permanent magnet module is perpendicular to the surface of the wirecord fabric, and the background magnetic field comprises magnetic lines which are positioned between the first permanent magnet module and the second permanent magnet module, vertically penetrate through the wirecord fabric and are vertically cut by steel cord threads in the wirecord fabric;
the magnetic sensor module is arranged between connecting lines of the first permanent magnet module and the second permanent magnet module and is used for acquiring and outputting magnetic field signals of the wirecord fabric;
The signal processing unit is used for generating magnetic image signals of the wirecord fabric according to the magnetic field signals of the wirecord fabric, wherein the magnetic image signals display periodically arranged steel cord threads contained in the wirecord fabric in a two-dimensional gray scale pattern mode.
2. A wirecord fabric defect detection system according to claim 1, wherein:
the distance between the edge of one side of the limiting wheel facing the wirecord fabric and the wirecord fabric is smaller than 5mm.
3. A wirecord fabric defect detection system according to claim 2, wherein:
The distance between the surface of the first permanent magnet module facing one side of the wirecord fabric and the wirecord fabric is larger than the distance between the edge of the limiting wheel facing one side of the wirecord fabric and the wirecord fabric;
the distance between the surface of the second permanent magnet module facing one side of the wirecord fabric and the wirecord fabric is larger than the distance between the edge of the limiting wheel facing one side of the wirecord fabric and the wirecord fabric.
4. A wirecord fabric defect detection system according to claim 3, wherein:
the first permanent magnet module comprises a permanent magnet or a plurality of permanent magnets which are arranged at intervals along the direction perpendicular to the movement direction of the wirecord fabric;
The second permanent magnet module comprises a permanent magnet or a plurality of permanent magnets which are arranged at intervals along the direction perpendicular to the movement direction of the wirecord fabric.
5. A wirecord fabric defect detection system according to claim 4, wherein:
The first permanent magnet module further comprises a first magnetic conduction plate, and the first magnetic conduction plate is arranged on the surface of one side, facing the wirecord fabric, of the first permanent magnet module;
The second permanent magnet module further comprises a second magnetic conduction plate, and the second magnetic conduction plate is arranged on the surface of one side, facing the wirecord fabric, of the second permanent magnet module;
The first magnetic conduction plate and the second magnetic conduction plate are made of magnetic conduction materials.
6. The wirecord fabric defect detection system of claim 1, wherein said magnetic sensor module comprises:
The plurality of magnetic sensors are arranged at intervals along the direction perpendicular to the movement direction of the wirecord fabric and are used for acquiring and outputting magnetic field signals of the wirecord fabric at the positions of the magnetic sensors, and the magnetic field signals of the wirecord fabric at the positions of the magnetic sensors are electric signals;
The control chip comprises a plurality of input ends and an output end, wherein the input ends are connected with the magnetic sensors in a one-to-one correspondence manner, the output ends are used for outputting magnetic field signals of the wirecord fabric, and the magnetic field signals of the wirecord fabric are serial electrical signals.
7. A wirecord fabric defect detection system according to claim 6, wherein:
The distance between the surface of the magnetic sensor module facing one side of the wirecord fabric and the wirecord fabric is greater than the distance between the edge of the limiting wheel facing one side of the wirecord fabric and the wirecord fabric.
8. The wirecord fabric defect detection system of claim 7, wherein said signal processing unit comprises:
The AD conversion module is connected with the control chip and used for converting the magnetic field signal of the wirecord fabric into a digital magnetic field signal of the wirecord fabric;
the data processing module is connected with the AD conversion module and is used for processing the digital magnetic field signal of the wirecord fabric to generate a magnetic image signal of the wirecord fabric, and
And the data transmitting module is used for transmitting the magnetic image signals of the wirecord fabric.
9. A wirecord fabric defect detection system according to claim 8, wherein said magnetic image detection means comprises:
The defect detection unit is used for generating a defect detection result of the wirecord fabric according to the magnetic image signal of the wirecord fabric, wherein the defect detection result comprises defect type and defect position information;
The display unit is used for displaying the magnetic image signals of the wirecord fabric and the defect detection result of the wirecord fabric;
the calculating unit is used for determining defect marking information according to the defect detection result of the wirecord fabric and the movement speed of the wirecord fabric, wherein the defect marking information comprises marking position information and marking triggering time;
An execution processing unit for performing defect marking according to the defect marking information;
An alarm unit for giving an abnormality alarm, and
The main control unit is connected with the data transmission module and is used for receiving the magnetic image signals of the wirecord fabric and controlling the defect detection unit, the display unit, the calculation unit, the execution processing unit and the alarm unit.
10. A wirecord fabric defect detection system according to any one of claims 1 to 9, wherein:
the wirecord fabric defect detection system further comprises a first frame body and a second frame body;
the first frame body is used for placing and fixing the first permanent magnet module;
the second frame body is used for placing and fixing the second permanent magnet module, the magnetic sensor module and the signal processing unit;
the surfaces of the first frame body and the second frame body, which face one side of the wirecord fabric, are cover plates.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111032892.XA CN113624832B (en) | 2021-09-03 | 2021-09-03 | Steel cord defect detection system |
| PCT/CN2022/091911 WO2023029562A1 (en) | 2021-09-03 | 2022-05-10 | Defect detection system for wirecord fabric |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111032892.XA CN113624832B (en) | 2021-09-03 | 2021-09-03 | Steel cord defect detection system |
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| CN113624832A CN113624832A (en) | 2021-11-09 |
| CN113624832B true CN113624832B (en) | 2024-12-03 |
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| CN202111032892.XA Active CN113624832B (en) | 2021-09-03 | 2021-09-03 | Steel cord defect detection system |
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| WO (1) | WO2023029562A1 (en) |
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| CN113624832B (en) * | 2021-09-03 | 2024-12-03 | 威海华菱光电股份有限公司 | Steel cord defect detection system |
| CN114166930B (en) * | 2021-12-07 | 2024-03-01 | 威海华菱光电股份有限公司 | Wirecord fabric detection and calibration device and detection and calibration method |
| CN114166929B (en) * | 2021-12-07 | 2024-01-30 | 威海华菱光电股份有限公司 | Wirecord fabric detection and calibration device and detection and calibration method |
| CN115452935A (en) * | 2022-08-29 | 2022-12-09 | 国珑智能科技(威海)有限公司 | Detection apparatus for tire cord fabric steel wire defect of arranging |
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