WO2023029562A1

WO2023029562A1 - Defect detection system for wirecord fabric

Info

Publication number: WO2023029562A1
Application number: PCT/CN2022/091911
Authority: WO
Inventors: 戚务昌; 张凯; 王虎岩; 林永辉; 王彭通
Original assignee: 威海华菱光电股份有限公司
Priority date: 2021-09-03
Filing date: 2022-05-10
Publication date: 2023-03-09
Also published as: CN113624832A

Abstract

A defect detection system for a wirecord fabric (41), comprising a limiting device for limiting the wirecord fabric (41), a magnetic image acquisition device for acquiring a magnetic image signal of the wirecord fabric (41), and a magnetic image detection device for detecting a defect of the wirecord fabric (41) according to the magnetic image signal. The limiting device comprises a plurality of limiting wheels (11) which are oppositely provided on the two sides of the wirecord fabric (41); the magnetic image acquisition device comprises a magnetic field unit, a magnetic sensor module (221), and a signal processing unit (23); and the magnetic field unit comprises a first permanent magnet module (211) and a second permanent magnet module (212) which are oppositely provided on the two sides of the wirecord fabric (41). The detection system can be used for generating the magnetic image signal of the wirecord fabric (41) on the basis of a change condition of a background magnetic field caused by the wirecord fabric (41) penetrating through the background magnetic field, and for detecting the magnetic image signal.

Description

Steel cord defect detection system

technical field

The present application relates to the field of industrial non-destructive testing, in particular to a detection system capable of generating and detecting magnetic field images of steel cords.

Background technique

Steel cord is an important part of truck tires. It is composed of an outer rubber layer and steel cords wrapped in the rubber layer at equal intervals. As a belt layer of truck tires, it provides important support for strengthening the structural strength and bearing capacity of truck tires. During the manufacturing process of steel cord, due to the influence of production equipment and process flow, the steel wires in the steel cord may have uneven distribution such as bending, dislocation, disconnection, crossing, etc. If the distribution of steel wires in the steel cord cannot be detected in real time, then It will have an adverse effect on the quality of the steel cord, and directly affect the performance and safety of the truck tire.

The traditional defect detection technology for steel cord is the non-destructive detection method based on X-rays. This method is gradually replaced by more economical, safe and convenient technical solutions due to high equipment costs and physical harm to operators.

An alternative technical solution is the steel cord defect detection technology based on the magnetic field, which uses the change of the magnetic field caused by the movement of the steel wire relative to the magnetic field to detect the defects of the steel cord. However, the existing magnetic field-based steel cord defect detection devices generally have the following problems:

1. The magnetic field detection unit used is composed of ordinary magnetic heads and coils, and its volume is often much larger than the arrangement period of the steel wires in the steel cord. The detected magnetic field changes are the result of the superposition of magnetic field changes caused by multiple steel wires, making the detection results The accuracy is not high, and there are problems such as missed detection and wrong detection. Additional processing steps for missed detection and wrong detection need to be set, which is not conducive to real-time detection of steel cord defects.

2. Due to the uneven distribution and scattered direction of the magnetic force lines on the edge of the magnetic field detection used, it is easily affected by external magnetic interference, which has a great impact on the accuracy of the detection results, and is prone to problems such as false alarms.

3. The existing steel cord defect detection technology based on magnetic field changes can only detect whether the steel wires are evenly spaced along the moving direction based on the analysis of the periodic changes in the magnetic field, and cannot detect the bending, misalignment, and disconnection of the steel wires in two-dimensional space. , Crossover and other defects are detected.

In order to solve the problems existing in the above steel cord defect detection technology, this application is hereby proposed.

Contents of the invention

The purpose of the present application is to provide a system capable of accurately generating magnetic image signals of steel cords in real time and detecting defects of the steel cords according to the magnetic image signals.

This application can be realized through the following technical solutions:

A steel cord defect detection system, used to generate a magnetic image signal of the steel cord and detect defects of the steel cord according to the magnetic image signal, including a limiting device for limiting the steel cord, The magnetic image acquisition device is used to generate the magnetic image signal of the steel cord, and the magnetic image detection device is used to detect the defects of the steel cord according to the magnetic image signal; The limit wheels on both sides of the steel cord, the number of the limit wheels on each side of the steel cord is not less than two and are distributed at intervals along the moving direction of the steel cord; the magnetic image acquisition The device includes a magnetic field unit, a magnetic sensor module and a signal processing unit; the magnetic field unit is used to generate a background magnetic field, including a first permanent magnet module and a second permanent magnet module oppositely arranged on both sides of the steel cord, The line connecting the first permanent magnet module and the second permanent magnet module is perpendicular to the surface of the steel cord, and the background magnetic field includes The magnetic lines of force passing through the steel cord vertically between the modules; the magnetic sensor module is used to obtain and output the magnetic field signal of the steel cord; the signal processing unit is used to generate the magnetic field signal according to the steel cord The magnetic image signal of the steel cord.

Further, the distance between the edge of the limiting wheel facing the side of the steel cord and the steel cord is less than 5mm.

Further, the distance between the surface of the first permanent magnet module facing the steel cord and the steel cord is greater than the distance between the edge of the limiting wheel facing the steel cord and the steel cord; The distance between the surface of the second permanent magnet module facing the side of the steel cord and the steel cord is greater than the distance between the edge of the limiting wheel facing the side of the steel cord and the steel cord.

Further, the first permanent magnet module includes a permanent magnet or a plurality of permanent magnets arranged at intervals along a direction perpendicular to the moving direction of the steel cord; the second permanent magnet module includes a permanent magnet or a plurality of permanent magnets Two permanent magnets are arranged at intervals along the direction perpendicular to the moving direction of the steel cord.

Preferably, the first permanent magnet module further includes a first magnetically conductive plate, and the first magnetically conductive plate is arranged on the surface of the first permanent magnet module facing the side of the steel cord; the second The permanent magnet module also includes a second magnetically conductive plate, and the second magnetically conductive plate is arranged on the surface of the second permanent magnet module facing the side of the steel cord; the first magnetically conductive plate, the second magnetically conductive plate The magnetic plate is made of magnetically permeable material.

Further, the magnetic sensor module includes: a plurality of magnetic sensitive elements arranged at intervals along a direction perpendicular to the moving direction of the steel cord, for acquiring and outputting the magnetic field of the steel cord at the position of the magnetic sensitive element signal, the magnetic field signal of the steel cord at the position of the magnetic sensitive element is an electrical signal; the control chip includes a plurality of input terminals and an output terminal, and the plurality of input terminals correspond to the plurality of magnetic sensitive elements one by one The output end is used to output the magnetic field signal of the steel cord, and the magnetic field signal of the steel cord is a serial electrical signal.

Further, the magnetic sensor module is arranged between the connection line of the first permanent magnet module and the second permanent magnet module, and the surface of the magnetic sensor module facing the side of the steel cord The distance from the steel cord is greater than the distance between the edge of the limiting wheel on the side facing the steel cord and the steel cord.

Further, the signal processing unit includes: an AD conversion module, connected to the control chip, for converting the magnetic field signal of the steel cord into a digital magnetic field signal of the steel cord; a data processing module, connected with the AD The conversion module is connected to process the digital magnetic field signal of the steel cord to generate the magnetic image signal of the steel cord; and the data sending module is used to send the magnetic image signal of the steel cord.

Further, the magnetic image detection device includes: a defect detection unit, configured to generate a defect detection result of the steel cord according to the magnetic image signal of the steel cord, and the defect detection result includes defect type and defect location information; A display unit, configured to display the magnetic image signal of the steel cord and the defect detection result of the steel cord; a calculation unit, configured to determine defect mark information according to the defect detection result of the steel cord and the moving speed of the steel cord , the defect marking information includes marking position information and marking trigger time; an execution processing unit is used to mark a defect according to the defect marking information; an alarm unit is used to perform an abnormal alarm; and a main control unit communicates with the data transmission The module is connected to receive the magnetic image signal of the steel cord and control the defect detection unit, the display unit, the calculation unit, the execution processing unit and the alarm unit.

Preferably, the steel cord defect detection system further includes a first frame and a second frame; the first frame is used to insert and fix the first permanent magnet module; the second frame Used to place and fix the second permanent magnet module, the magnetic sensor module and the signal processing unit; the surfaces of the first frame and the second frame facing the side of the steel cord for the cover.

A steel cord magnetic image signal detection system provided by an embodiment of the present application has at least the following beneficial effects:

1. With the first permanent magnet module and the second permanent magnet module facing each other, the distribution of the magnetic force lines of the background magnetic field is more uniform, and the consistency of the direction of the magnetic force lines is good, especially in the vicinity of the steel cord, which can pass through the steel cord vertically , so that the periodically arranged steel wires of the steel cord can cut the magnetic force lines at a vertical angle, so that 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 magnetic field change is effectively improved.

2. Set the limit wheel with a certain distance from the steel cord. Under the condition that the steel cord is not in contact with the magnetic field acquisition device, the steel cord has a certain movement space at the detection position. At this time, because the magnetic force line is uniform and vertical Through the steel cord plane, the accuracy of the detected magnetic field change signal remains unchanged, and the limit wheel does not press the steel cord, which can effectively avoid the wear on the surface of the steel cord.

3. The magnetic sensor module is composed of multiple magnetic sensitive elements, which effectively increases the detection range, and converts the change signal of the background magnetic field obtained by multiple magnetic sensitive elements into a two-dimensional magnetic image signal of the steel cord, which can analyze the steel cord. Based on the one-dimensional periodic arrangement of wires, the ability to detect defects such as bending, staggering, disconnection, and crossing of steel cords on a two-dimensional plane is added.

Description of drawings

Fig. 1 is the electrical schematic diagram of the magnetic field signal obtained by the magnetic sensitive element;

Fig. 2 is a system composition block diagram of the steel cord magnetic image signal detection system of the embodiment of the present application;

Fig. 3 is an assembly perspective view of a preferred implementation manner of the embodiment of the present application;

Fig. 4 is an assembly side view of a preferred embodiment of the embodiment of the present application;

Fig. 5 is the distribution situation of the background magnetic field line of force of the embodiment of the present application;

Fig. 6 is the distribution situation of the background magnetic field magnetic force line of an embodiment contrasted with the embodiment of the present application;

Fig. 7 is the preferred embodiment of the first permanent magnet module of the embodiment of the present application;

FIG. 8 is a perspective view of a magnetic sensor module and a signal processing unit in a preferred embodiment of the 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 sensor module in a preferred embodiment of the embodiment of the present application;

Fig. 11 is a working flow chart of the signal processing unit of the embodiment of the present application;

Fig. 12 is the magnetic image signal of the steel cord fabric generated by the signal processing unit of the embodiment of the present application;

Fig. 13 is a working flow chart of the magnetic image detection device according to the embodiment of the present application;

Fig. 14 is a schematic diagram of marking a defect position on a magnetic image signal of a steel cord according to an embodiment of the present application.

Label in the figure

11 limit wheel, 211 first permanent magnet module, 212 second permanent magnet module, 213 first magnetic plate, 214 second magnetic plate, 221 magnetic sensor module, 2210 magnetic sensitive element, 2211 control chip, 23 signal processing unit, 41 steel cord, 51 first frame body, 52 second frame body, 53 cover plate, 61 first circuit substrate, 62 second circuit substrate, 70 signal connection line.

Detailed ways

Hereinafter, the present application will be further described based on preferred embodiments with reference to the drawings.

In addition, for the convenience of understanding, various components on the drawings are enlarged (thick) or reduced (thin), but this approach is not intended to limit the scope of protection of the present application.

Words in the singular include the plural and vice versa.

In the description of the embodiments of the present application, it should be noted that if the orientation or positional relationship indicated by the terms "upper", "lower", "inner" and "outer" appear, it is based on the orientation or position shown in the drawings relationship, or the orientation or positional relationship that is conventionally placed when the embodiments of the application are used, are only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, in a specific configuration and operation, and therefore should not be construed as limiting the application. In addition, in the description of the present application, in order to distinguish different units, words such as first and second are used in this specification, but these are not limited by the order of manufacture, nor can they be interpreted as indicating or implying relative importance. The detailed description of the embodiments of the present application and the claims may have different titles.

The terms used in this specification are used to describe the embodiments of the present application, but are not intended to limit the present application. It should also be noted that, unless otherwise clearly stipulated and limited, the terms "set", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediary, or an internal connection between two components. Those skilled in the art can specifically understand the above-mentioned specific meanings in this application.

In order to better illustrate the technical solution of the embodiment of the present application, we first introduce the principle of magnetic field signal acquisition by the magnetic sensor with reference to FIG. 1 .

Figure 1 is the electrical schematic diagram of the magnetic field signal obtained by the magnetic sensitive element. As shown in Figure 1, the magnetic sensitive element is a component that can sense the magnetic field and convert the magnetic field signal into an electrical signal for output, including a series magneto-sensitive resistor and a reference resistance, wherein the resistance value Rs of the magneto-sensitive resistor changes with the change of the induced magnetic field, and the resistance value Rf of the reference resistance is a constant value.

When it is necessary to obtain a magnetic field signal, place the magnetic sensitive element in the background magnetic field, and as shown in Figure 1, apply a voltage VDD to one end of the magnetic sensitive element, and ground the other end, and at the same time draw the output voltage from between the magnetic sensitive resistor and the reference resistor Vo. At this time, the resistance Rs of the magneto-sensitive resistor is the resistance corresponding to the background magnetic field. According to the principle of voltage division, Vo=VDD*Rf/(Rf+Rs), the output voltage signal Vo is the signal reflecting the background magnetic field.

When an object containing a magnetic material approaches and enters the background magnetic field, the movement of the magnetic material will cause a change in the background magnetic field, thereby causing a change in Rs, and further causing a change in the output voltage signal Vo. At this time, the output voltage signal Vo is A magnetic field signal that reflects changes in the location of each magnetic sensor.

In actual manufacturing and use, in order to obtain a wide range of magnetic field signals, a plurality of magnetic sensitive elements are generally arranged at intervals along a preset direction, and the magnetic field signals output by a plurality of magnetic sensitive elements are processed in parallel to serial, and the serial output in the form of a magnetic field signal.

The specific implementation of the embodiment of the present application will be described in detail below with reference to FIG. 2 to FIG. 14 .

Fig. 2 is a system block diagram of the embodiment of the present application, Fig. 3 is an assembly perspective view of a preferred implementation of the embodiment of the present application (the magnetic image detection device is not included in the figure), and Fig. 4 is a preferred embodiment of the present application The assembled side view of the embodiment of (the magnetic image detection device is not included in the figure).

As shown in Figures 2 to 4, the embodiment of the present application provides a steel cord defect detection system, which is used to generate a magnetic image signal of the steel cord and detect the defect of the steel cord according to the magnetic image signal, including a limit device, Used to limit the steel cord 41, the magnetic image acquisition device is used to generate the magnetic image signal of the steel cord 41, and the magnetic image detection device is used to detect the defect of the steel cord according to the magnetic image signal.

Hereinafter, specific implementation manners of the limiting device of the embodiment of the present application will be described in detail with reference to FIG. 3 and FIG. 4 .

As shown in Fig. 3 and Fig. 4, the limit device includes limit wheels 11 oppositely arranged on both sides of the steel cord 41 (in order to clearly illustrate the embodiment of the application, the steel cord 41 is periodically distributed in the steel cord The number of limit wheels 11 located on each side of the steel cord 41 is not less than two and are distributed at intervals along the moving direction of the steel cord 41. Driven by the device, it moves in the direction shown by the dotted arrow, and the transmission device is well known to those skilled in the art, and will not be repeated here.

Further, the distance between the edge of the limiting wheel 11 facing the steel cord 41 and the steel cord 41 is less than 5mm, and by setting the distance between the edge of the limiting wheel 11 facing the steel cord 41 and the steel cord 41, the limiting wheel 11 The steel cord 41 is kept in a non-contact position instead of being pressed against the steel cord 41 , thereby effectively avoiding the abrasion of the surface of the steel cord 41 by the magnetic image acquisition device.

Hereinafter, a specific implementation manner of the magnetic image acquisition device according to the embodiment of the present application will be described in detail with reference to FIG. 2 to FIG. 11 .

As shown in FIGS. 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 Figure 4, the magnetic field unit is used to generate the background magnetic field, including the first permanent magnet module 211 and the second permanent magnet module 212 oppositely arranged on both sides of the steel cord 41, the first permanent magnet module 211 and the second permanent magnet module 212 The connecting line between the two permanent magnet modules 212 is perpendicular to the surface of the steel cord 41 , and the background magnetic field includes a magnetic field line between the first permanent magnet module 211 and the second permanent magnet module 212 passing through the steel cord 41 perpendicularly.

Further, as shown in FIG. 4 , the distance between the surface of the first permanent magnet module 211 facing the steel cord 41 and the steel cord 41 is greater than the distance between the edge of the limiting wheel 11 facing the steel cord 41 and the steel cord 41 ; The distance between the surface of the second permanent magnet module 212 facing the steel cord 41 and the steel cord 41 is greater than the distance between the edge of the limiting wheel 11 facing the steel cord 41 and the steel cord 41 .

Further, the first permanent magnet module 211 includes a permanent magnet or a plurality of permanent magnets arranged at intervals along a direction perpendicular to the moving direction of the steel cord; the second permanent magnet module 212 includes a permanent magnet or a plurality of permanent magnets along the Permanent magnets arranged at intervals in a direction perpendicular to the moving direction of the steel cord.

Preferably, as shown in FIG. 4, the first permanent magnet module 211 also includes a first magnetically conductive plate 213, and the first magnetically conductive plate 213 is arranged on the surface of the first permanent magnet module 211 facing the steel cord 41; The second permanent magnet module 212 also includes a second magnetically conductive plate 214, and the second magnetically conductive plate 214 is arranged on the surface of the second permanent magnet module 212 facing the steel cord 41 side; the first magnetically conductive plate 213, the second magnetically conductive plate 213 Plate 214 is made of magnetically permeable material.

In the specific implementation of the embodiment of the present application, the first magnetically permeable plate 213 and the second magnetically permeable plate 214 can be made of iron plate, ferrite plate, permalloy plate and/or silicon steel plate, etc., for The magnetic force lines of the background magnetic field generated by the first permanent magnet module 211 and the second permanent magnet module 212 are guided to make the distribution of intensity and direction more uniform.

FIG. 5 shows the distribution of the magnetic force lines of the background magnetic field in the embodiment of the present application. As a comparison, FIG. 6 shows the distribution of the magnetic force lines of the background magnetic field when the permanent magnet module is only installed on the steel cord 41 side.

Comparing Fig. 5 and Fig. 6, it can be seen that since the first permanent magnet module 211 and the second permanent magnet module 212 are oppositely arranged on both sides of the steel cord 41, the magnetic field lines of the background magnetic field generated by them are more concentrated It is distributed on the connecting line between the first permanent magnet module 211 and the second permanent magnet module 212 and is perpendicular to the moving plane of the steel cord 41 . Utilizing the arrangement of the magnetic field module in the embodiment of the present application can make the distribution of the magnetic force lines of the background magnetic field more uniform and concentrated in the direction perpendicular to the direction of movement of the steel cord 41, so that the steel cords in the steel cord 41 can cut the magnetic force lines vertically , thereby greatly increasing the variation range of the background magnetic field when the steel cord 41 moves, and effectively improving the signal-to-noise ratio of the obtained magnetic field signal.

In the technical solution of the embodiment of the present application, since the magnetic force lines of the background magnetic field are concentrated in the direction perpendicular to the direction of motion of the steel cord 41, even if the steel cord 41 is displaced in the direction perpendicular to the direction of motion by the magnetic attraction force of the magnetic field unit, for the obtained magnetic field signal The influence of precision is also relatively small. At the same time, by setting the limit wheel 11 closer to the steel cord 41, the steel cord 41 cannot be adsorbed on the magnetic field unit. The position is limited by tightening the steel cord 41, thereby avoiding damage to the surface of the steel cord 41.

Preferably, the cross-sectional width of the first permanent magnet module 211 towards the side of the steel cord 41 is smaller than the distance between adjacent steel cords of the steel cord 41; Line spacing.

Specifically, as shown in FIG. 7 , in a preferred implementation of the embodiment of the present application, the cross-sectional shape of the first permanent magnet module 211 can be set as a trapezoid that gradually shrinks toward the steel cord 41, and set it toward The cross-sectional width of one side of the steel cord 41 is smaller than the distance between adjacent steel cords, and the cross-sectional shape of the second permanent magnet module 212 is set to be rectangular, and its cross-sectional width is set to be smaller than the distance between adjacent steel cords of the steel cord 41 .

In other implementations of the embodiment of the present application, the cross-sectional shape of the first permanent magnet module 211 may also be set as a wedge shape gradually shrinking toward the steel cord 41 or other gradually shrinking shapes.

By setting the cross-sectional width of the first permanent magnet module 211 and the second permanent magnet module 212 towards the side of the steel cord 41 to be smaller than the distance between adjacent steel cords, and further setting the cross-section of the first permanent magnet module 211 It is a gradually shrinking trapezoid or wedge shape, which can make the distribution of the magnetic field lines of the background magnetic field concentrated in an interval period of the steel cord, which can greatly reduce the change of the background magnetic field acquired by the magnetic sensor due to the movement of the steel cord outside the detection area. Signal interference makes the change signal of the background magnetic field acquired by the magnetic sensor more sensitive to the movement of the steel cord in the detection area, which can effectively improve the accuracy of the change signal of the background magnetic field acquired by the magnetic sensor.

Fig. 8 is a perspective view of the magnetic sensor module 221 and the signal processing unit 23 of the embodiment of the present application (for a clearer description, the blocked part in the figure is shown with a dotted line), and Fig. 9 is a perspective view of the magnetic sensor module of the embodiment of the present application Electrical schematics.

As shown in Fig. 4, Fig. 8 and Fig. 9, the magnetic sensor module 221 includes: a plurality of magnetic sensitive elements 2210 arranged at intervals along the direction perpendicular to the moving direction of the steel cord, used to obtain and output the steel cord 41 The magnetic field signal at the position of the magnetic sensitive element 2210, wherein, the magnetic field signal of the steel cord 41 at the position of the magnetic sensitive element 2210 is an electric signal; the control chip 2211 includes a plurality of input terminals and an output terminal, and a plurality of input terminals and a plurality of magnetic sensitive components The elements 2210 are connected in one-to-one correspondence, and the output end is used to output the magnetic field signal of the steel cord 41, wherein the magnetic field signal of the steel cord 41 is a serial electrical signal.

Further, the magnetic sensor module 221 is arranged between the connecting line of the first permanent magnet module 211 and the second permanent magnet module 212, and the surface of the magnetic sensor module 221 facing the side of the steel cord 41 is in contact with the surface of the steel cord 41. The distance is greater than the distance between the edge of the limiting wheel 11 facing the side of the steel cord and the steel cord 41 .

In the specific implementation of the embodiment of the present application, as shown in Figure 8 and Figure 9, a plurality of magnetic sensitive elements 2210 are located in the background magnetic field, arranged at intervals in a direction perpendicular to the direction of motion of the steel cord 41, and the sensed steel wires The magnetic field signal of the curtain 41 at this position is output to the control chip 2211 through the signal connection line 70 in the form of an electric signal Vo. The 2211 also includes a clock signal terminal for receiving the clock signal CLK and a start signal terminal for receiving the start signal SI. After receiving the start signal SI, the control chip 2211 sequentially reads a plurality of magnetic sensors under the synchronization of the clock signal CLK. The magnetic field signal Vo obtained by the element 2210 is converted from parallel to serial processing to form a serial magnetic field signal Vout of the steel cord, and is output to the signal processing unit 23 through the output terminal.

Fig. 10 is an electrical schematic diagram of another specific implementation of the magnetic image acquisition device of the embodiment of the present application. In this implementation, in order to expand the detection range, multiple magnetic sensor modules 221 can also be combined with the The movement direction of 41 is arranged and connected at intervals in the direction perpendicular to the movement direction. After receiving the start signal SI, multiple magnetic sensor modules output the magnetic field signal Vout of the steel cord to the signal processing unit 23 in sequence under the synchronization of the clock signal CLK.

The specific implementation manner of the signal processing unit 23 will be described in detail below with reference to the working flowchart of the signal processing unit 23 in the embodiment of the present application shown in FIG. 11 .

As shown in Figure 11, signal processing unit 23 comprises AD conversion module, is connected with control chip 2211, is used to convert the magnetic field signal of steel cord to the digital magnetic field signal of steel cord 41; Data processing module, is connected with AD conversion module, uses The digital magnetic field signal of the steel cord 41 is processed to generate a magnetic image signal of the steel cord 41 ; and the data sending module is used for sending the magnetic image signal of the steel cord 41 .

Specifically, in the specific implementation of the embodiment of the present application, the AD conversion module may be an 8-bit analog-to-digital conversion chip, connected to the control chip 2211 through the signal connection line 70, and converts the magnetic field signal Vout of the serial steel cord 41 into The output interval is the digital magnetic field signal Dout of the serial steel cord 41 of 0-255 (total 256 levels); the AD conversion module can also be an analog-to-digital conversion chip with a higher number of digits, so as to divide the output interval more finely;

The data processing module may include a clock signal interface, which converts the digital magnetic field signal Dout of the steel cord 41 into a magnetic image signal Dimage of the steel cord 41 under the synchronization of the clock signal CLK;

The data sending module sends the magnetic image signal Dimage of the steel cord 41 to the magnetic image detection device in a wired or wireless manner.

Fig. 12 shows the magnetic image signal generated by the signal processing unit in the specific implementation manner of the embodiment of the present application.

In a preferred implementation of the embodiment of the present application, a correction module may also be provided between the AD conversion module and the data processing module to correct the digital magnetic field signal Dout of the steel cord 41 .

Hereinafter, a preferred implementation manner of the magnetic image acquisition device in the embodiment of the present application will be introduced with reference to FIG. 3 to FIG. 5 .

As shown in Figures 3 to 5, the steel cord defect detection system of the embodiment of the present application also includes a first frame body 51 and a second frame body 52, the first frame body 51 is used to insert and fix the first permanent magnet module 211; the second frame body 52 is used to insert and fix the second permanent magnet module 212, the magnetic sensor module 221 and the signal processing unit 23; the first frame body 51 and the second frame body 52 face the side of the steel cord 41 The surface is a cover plate 53 .

Specifically, as shown in Figure 5, in a preferred implementation of the embodiment of the present application, the first frame body 51 and the second frame body 52 are oppositely arranged on both sides of the steel cord 41; the first permanent magnet module 211 is fixedly placed in the first frame body 51 and the first magnetically permeable plate 213 is placed on the surface of the first permanent magnet module 211 facing the steel cord 41 side, and the second permanent magnet module 212 is fixedly placed in the second frame body 52 and the second magnetic plate 214 is placed on the surface of the second permanent magnet module 213 facing the steel cord 41; a plurality of magnetic sensitive elements 2210 and control chips 2211 are respectively packaged on one side of the first circuit substrate 61 facing the steel cord 41. The side and the side facing away from the steel cord 41, and a plurality of magnetic sensitive elements 2210 are placed between the connecting lines of the first permanent magnet module 211 and the second permanent magnet module 212, and the first circuit board 61 is fixed on the second In the second frame body 52 and located on the surface of the second magnetically conductive plate 214 facing the steel cord 41 side; the signal processing unit 23 is packaged on the second circuit substrate 62, and is connected with the control chip 2211 by a signal connection line 70 (not shown in FIG. 4 The signal connection line 70 is shown), and the second circuit board 62 is fixed on the side of the second frame 52 away from the steel cord 41; the surface of the frame 51 and the frame 52 facing the steel cord 41 is a cover plate 53, and the cover The plate 53 is made of a material with high wear resistance, and is used to protect the signal magnetic sensor module 221 and the first magnetic field module 211 and prevent the steel cord 41 from being worn.

Hereinafter, specific implementation manners of the magnetic image detection device according to the embodiment of the present application will be described in detail with reference to FIG. 13 and FIG. 14 .

Fig. 13 is a system block diagram of a magnetic image detection device. As shown in Fig. 13, the magnetic image detection device includes a defect detection unit for generating a defect detection result of the steel cord 41 according to a magnetic image signal of the steel cord 41, and the defect detection result includes a defect type and location information of the defect; a display unit for displaying the magnetic image signal of the steel cord 41 and the defect detection result of the steel cord 41; a calculation unit for determining according to the defect detection result of the steel cord 41 and the moving speed of the steel cord 41 defect mark information, the defect mark information includes mark position information and mark trigger time; the execution processing unit is used to mark the defect according to the defect mark information; the alarm unit is used for abnormal alarm; and the main control unit is connected with the data sending module, It is used to receive the magnetic image signal of the steel cord 41 and control the defect detection unit, display unit, calculation unit, execution processing unit and alarm unit.

In a specific implementation manner of the embodiment of the present application, the main control unit may be the main processor in a desktop computer or a notebook computer, by reading and running the control program in a storage device such as a hard disk or an optical disk, and the defect detection unit, The display unit, calculation unit, execution processing unit, and alarm unit communicate and control the above-mentioned units to execute their respective workflows.

The main control unit receives the magnetic image signal Dimage sent by the data sending module of the signal processing unit 23 through a wired data interface or a wireless transmission data interface.

According to the magnetic image signal Dimage of the steel cord 41 displayed in the form of a two-dimensional grayscale image, the defect detection unit analyzes defects such as position deviation, bending, disconnection, and crossing of the periodically arranged steel cords contained therein, and generates defects Detection results, defect detection results include defect type and defect location information.

The display unit displays magnetic image signals and defect detection results, and the display unit can be a monitor of a desktop computer, a screen of a notebook or a tablet computer. Fig. 14 shows the magnetic image signal of the steel cord 41 including the defect detection result displayed by the display unit in a specific implementation of the embodiment of the present application.

The calculation unit obtains the defect detection result generated by the defect detection unit, and determines the defect mark information such as the mark position and mark trigger time required by the execution processing unit for defect mark according to the moving speed of the steel cord 41, and sends the above defect mark information to Execution processing unit.

The execution processing unit can be a device such as a mechanical arm with a marking function, which can perform two-dimensional movement in the horizontal direction and move up and down in the vertical direction. After the execution processing unit receives the defect marking information, it will check the marking position to mark.

The alarm unit issues an alarm when detecting a defect in the steel cord 41 through sound, light, image and other means.

The specific implementation of the application has been described in detail above. For those skilled in the art, without departing from the principle of the application, some improvements and modifications can be made to the application, and these improvements and modifications also belong to the application. The scope of the claims.

Claims

A steel cord defect detection system, used to generate a magnetic image signal of the steel cord and detect defects of the steel cord according to the magnetic image signal, including a limiting device for limiting the steel cord, The magnetic image acquisition device is used to generate the magnetic image signal of the steel cord, and the magnetic image detection device is used to detect the defect of the steel cord according to the magnetic image signal, which is characterized in that:

The limiting device includes limiting wheels oppositely arranged on both sides of the steel cord, the number of the limiting wheels on each side of the steel cord is not less than two and moves along the steel cord direction interval distribution;

The magnetic image acquisition device includes a magnetic field unit, a magnetic sensor module and a signal processing unit;

The magnetic field unit is used to generate a background magnetic field, including a first permanent magnet module and a second permanent magnet module oppositely arranged on both sides of the steel cord, the first permanent magnet module and the second permanent magnet The connection line of the magnet module is perpendicular to the surface of the steel cord, and the background magnetic field includes a magnetic field line between the first permanent magnet module and the second permanent magnet module that passes through the steel cord vertically ;

The magnetic sensor module is used to acquire and output the magnetic field signal of the steel cord;

The signal processing unit is used for generating the magnetic image signal of the steel cord according to the magnetic field signal of the steel cord.
The steel cord defect detection system according to claim 1, characterized in that:

The distance between the edge of the limiting wheel facing the steel cord and the steel cord is less than 5mm.
The steel cord defect detection system according to claim 2, characterized in that:

The distance between the surface of the first permanent magnet module facing the steel cord and the steel cord is greater than the distance between the edge of the limiting wheel facing the steel cord and the steel cord;

The distance between the surface of the second permanent magnet module facing the side of the steel cord and the steel cord is greater than the distance between the edge of the limiting wheel facing the side of the steel cord and the steel cord.
The steel cord defect detection system according to claim 3, characterized in that:

The first permanent magnet module includes a permanent magnet or a plurality of permanent magnets arranged at intervals along a direction perpendicular to the moving direction of the steel cord;

The second permanent magnet module includes one permanent magnet or a plurality of permanent magnets arranged at intervals along a direction perpendicular to the moving direction of the steel cord.
The steel cord defect detection system according to claim 4, characterized in that:

The first permanent magnet module also includes a first magnetically conductive plate, and the first magnetically conductive plate is arranged on the surface of the first permanent magnet module facing the side of the steel cord;

The second permanent magnet module also includes a second magnetically conductive plate, and the second magnetically conductive plate is arranged on the surface of the second permanent magnet module facing the side of the steel cord;

The first magnetically conductive plate and the second magnetically conductive plate are made of magnetically permeable materials.
The steel cord defect detection system according to claim 1, wherein the magnetic sensor module comprises:

A plurality of magnetic sensitive elements arranged at intervals in a direction perpendicular to the moving direction of the steel cord are used to acquire and output the magnetic field signal of the steel cord at the position of the magnetic sensitive element, and the steel cord is at the position of the magnetic sensitive element The magnetic field signal at the component position is an electrical signal;

The control chip includes a plurality of input ends and an output end, the plurality of input ends are connected to the plurality of magnetic sensitive elements in one-to-one correspondence, the output end is used to output the magnetic field signal of the steel cord, and the The magnetic field signal of the steel cord is a serial electrical signal.
The steel cord defect detection system according to claim 6, characterized in that:

The magnetic sensor module is arranged between the connecting line of the first permanent magnet module and the second permanent magnet module, and the surface of the magnetic sensor module facing the side of the steel cord is in contact with the The distance of the steel cord is greater than the distance between the edge of the limiting wheel facing the side of the steel cord and the steel cord.
The steel cord defect detection system according to claim 7, wherein the signal processing unit comprises:

An AD conversion module, connected to the control chip, for converting the magnetic field signal of the steel cord into a digital magnetic field signal of the steel cord;

A data processing module, connected to the AD conversion module, for processing the digital magnetic field signal of the steel cord to generate a magnetic image signal of the steel cord; and

The data sending module is used for sending the magnetic image signal of the steel cord.
The steel cord defect detection system according to claim 8, wherein the magnetic image detection device comprises:

A defect detection unit, configured to generate a defect detection result of the steel cord according to the magnetic image signal of the steel cord, the defect detection result including defect type and defect location information;

a display unit for displaying the magnetic image signal of the steel cord and the defect detection result of the steel cord;

A calculation unit, configured to determine defect marker information according to the defect detection result of the steel cord and the moving speed of the steel cord, where the defect marker information includes marker position information and marker trigger time;

Executing a processing unit, configured to perform defect marking according to the defect marking information;

an alarm unit, used for abnormal alarm; and

a main control unit, connected with the data sending module, for receiving the magnetic image signal of the steel cord and controlling the defect detection unit, the display unit, the calculation unit, the execution processing unit and the alarm unit.
The steel cord defect detection system according to any one of claims 1 to 9, characterized in that:

The steel cord defect detection system also includes a first frame and a second frame;

The first frame is used to insert and fix the first permanent magnet module;

The second frame is used to place and fix 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 facing the side of the steel cord are cover plates.