Steel cord defect detection device

Abstract

The present application provides a steel cord defect detection device, which is used to obtain a reinforced magnetic field signal of a steel cord and detect defects of the steel cord based on the reinforced magnetic field signal, including a magnetic field unit, including a permanent magnet for generating a background magnetic field; a signal acquisition unit, which generates a reinforced magnetic field signal of the steel cord based on a plurality of first magnetic field signals and a plurality of second magnetic field signals, including a magnetic sensor module, a differential module and a signal output module; a defect detection unit, which detects defects of the steel cord based on the reinforced magnetic field signal, including an AD conversion module, a signal processing module, a defect detection module, a display module and a control module. The steel cord detection device provided by the present application can effectively improve the signal-to-noise ratio, eliminate the problem of poor accuracy of magnetic field signals caused by uneven distribution of magnetic field lines of the background magnetic field, and effectively reduce the influence of interfering magnetic fields.

Description

Technical Field

[0001] The present application relates to the field of industrial nondestructive testing, and in particular to a device capable of detecting steel cord defects based on a reinforced magnetic field signal of the steel cord. Background Art

[0002] Steel cord is an important component of load-bearing tires. It consists of an outer rubber layer and steel cords wrapped inside the rubber layer at equal intervals. As the belt layer of the load-bearing tire, it provides important support for strengthening the structural strength and load-bearing of the load-bearing tire. 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 be unevenly distributed, such as bending, dislocation, disconnection, and crossing. If the distribution of steel wires in the steel cord cannot be detected in real time, it will have an adverse effect on the quality of the steel cord and directly affect the performance and safety of the load-bearing tire.

[0003] Existing technologies for non-destructive testing of steel cord fabrics include non-destructive testing methods based on X-rays, non-destructive testing methods based on the principle of electromagnetic induction, etc. Among them, the non-destructive testing method based on electromagnetic induction detects the steel cord inside the steel cord fabric according to the changes in the magnetic field caused by the movement of the steel cord fabric in the magnetic field, and is economical, safe and convenient.

[0004] However, the existing magnetic field-based steel cord defect detection devices generally have the following problems:

[0005] 1. The magnetic field detection unit used is composed of a general magnetic head and a coil, 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, which makes the detection result inaccurate, and there are problems such as missed detection and wrong detection. Additional processing steps for missed detection and wrong detection are required, which is not conducive to real-time detection of steel cord defects.

[0006] 2. The placement of the magnetic field detection unit has high requirements, especially the strength of the background magnetic field and the distribution of magnetic lines of force, which have a great impact on the detection results.

[0007] In order to solve the problems existing in the above steel cord defect detection technology, this application is specially proposed. Summary of the invention

[0008] The purpose of the present application is to provide a steel cord defect detection device, which can obtain a reinforced magnetic field signal of the steel cord and detect defects of the steel cord based on the reinforced magnetic field signal.

[0009] This application can be implemented through the following technical solutions:

[0010] A steel cord defect inspection device, used for acquiring a reinforced magnetic field signal of a steel cord and detecting defects of the steel cord based on the reinforced magnetic field signal, comprising: a magnetic field unit, comprising a permanent magnet for generating a background magnetic field; a signal acquisition unit, generating the reinforced magnetic field signal of the steel cord based on a plurality of first magnetic field signals and a plurality of second magnetic field signals, comprising a magnetic sensor module, used for generating the plurality of first magnetic field signals and the plurality of second magnetic field signals, a differential module, connected to the magnetic sensor module, generating a plurality of differential magnetic field signals based on the plurality of first magnetic field signals and the plurality of second magnetic field signals, and a signal output module, connected to the differential module, comprising a plurality of input terminals and at least one output terminal for receiving the plurality of differential magnetic field signals, generating and outputting the reinforced magnetic field signal based on the plurality of differential magnetic field signals; a defect detection unit, detecting defects of the steel cord based on the reinforced magnetic field signal, comprising an AD conversion module, a signal processing module, a defect detection module, a display module and a control module.

[0011] Furthermore, the magnetic sensor module includes: a plurality of first magnetic sensitive elements, used to sense the magnetic field changes caused by the movement of the steel cord in the background magnetic field and generate the plurality of first magnetic field signals; a plurality of second magnetic sensitive elements, used to sense the magnetic field changes caused by the movement of the steel cord in the background magnetic field and generate the plurality of second magnetic field signals; the plurality of first magnetic field signals and the plurality of second magnetic field signals are electrical signals.

[0012] Furthermore, the multiple first magnetic sensitive elements correspond to the multiple second magnetic sensitive elements one by one, and the spacing distance between each first magnetic sensitive element and the corresponding second magnetic sensitive element along the moving direction of the steel cord is half of the spacing distance between adjacent steel cords of the steel cord along the moving direction of the steel cord.

[0013] Furthermore, the plurality of first magnetic sensitive elements are distributed at intervals along a direction perpendicular to the moving direction of the steel cord; and the plurality of second magnetic sensitive elements are distributed at intervals along a direction perpendicular to the moving direction of the steel cord.

[0014] Furthermore, the differential module includes a plurality of differential circuits, and the plurality of differential circuits are connected to the plurality of first magnetic sensitive elements and the plurality of second magnetic sensitive elements in a one-to-one correspondence.

[0015] Specifically, one end of the differential circuit is connected to the first magneto-sensitive element, the other end of the differential circuit is connected to the second magneto-sensitive element, and the output ends of the multiple differential circuits are connected to multiple input ends of the signal output module.

[0016] Furthermore, the magnetic field unit further comprises a magnetic conductive plate, the magnetic conductive plate is located on the surface of the permanent magnet facing the steel cord fabric, and the magnetic conductive plate is made of a magnetic conductive material.

[0017] Furthermore, the AD conversion module is connected to the signal output module, and is used to convert the enhanced magnetic field signal into a digital magnetic field signal; the signal processing module processes the digital magnetic field digital signal to generate a magnetic field signal to be detected; the defect detection module analyzes the magnetic field signal to be detected to generate a detection result of the steel cord defect; the display module displays the signal to be detected and the detection result of the steel cord defect; the control module is used to control the AD conversion module, the signal processing module, the defect detection module and the display module.

[0018] Furthermore, the defect detection unit also includes: a calculation module, which determines defect marking information according to the detection result of the steel cord defect and the movement speed of the steel cord, and the defect marking information includes marking position information and marking trigger time; a defect processing module, which marks the defect according to the defect marking information; and an alarm module, which is used to make an abnormal alarm.

[0019] Furthermore, the steel cord detection device further comprises: a frame, which is used to fix the magnetic field unit and the signal acquisition unit in the frame.

[0020] Furthermore, a surface of the frame body facing the steel cord fabric is a cover plate.

[0021] The steel cord defect detection system provided by the present application has at least the following beneficial effects:

[0022] 1. The intervals between the multiple first magnetic sensitive elements and the multiple second magnetic sensitive elements arranged at intervals along the moving direction of the steel cord are set to half of the intervals between adjacent steel cords in the steel cord along the moving direction of the steel cord, so that a magnetic field signal delayed by half a cycle can be generated. The enhanced magnetic field signal of the steel cord is obtained by differential processing using multiple differential circuits, which can offset the background magnetic field signal and enhance the intensity of the magnetic field signal of the periodically arranged steel cord. Compared with the signal obtained by a single magnetic sensitive element with the background magnetic field superimposed, the signal-to-noise ratio can be effectively improved.

[0023] 2. By offsetting the background magnetic field signal, the influence of the placement of the magnetic field unit on the acquired enhanced magnetic field signal is greatly weakened, eliminating the problem of poor accuracy of the magnetic field signal caused by the uneven distribution of the background magnetic field lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 An electrical schematic diagram for obtaining an output magnetic field signal for a magnetic sensing element;

[0025] Figure 2 A system block diagram of a steel cord defect detection device according to an embodiment of the present application;

[0026] Figure 3 A three-dimensional diagram of a specific implementation method of the embodiment of the present application;

[0027] Figure 4 It is an assembly side view of a specific implementation method of the embodiment of the present application;

[0028] Figure 5 An electrical connection diagram of a signal acquisition unit according to an embodiment of the present application;

[0029] Figure 6 This is an electrical schematic diagram of a signal acquisition unit according to an embodiment of the present application;

[0030] Figure 7 The steel cord fabric magnetic field signal output by the magnetic sensitive element in the prior art;

[0031] Figure 8 A differential magnetic field signal output by the differential circuit of the embodiment of the present application;

[0032] Fig. 9 It is an assembly side view of another specific implementation of the embodiment of the present application;

[0033] Fig.10 It is an assembly side view of another specific implementation of the embodiment of the present application;

[0034] Fig.11 A system block diagram of a defect detection unit according to an embodiment of the present application;

[0035] Fig.12 A magnetic field square wave signal of a certain point of a steel cord fabric marked with defect information in a specific implementation manner of an embodiment of the present application;

[0036] Fig.13 A magnetic image of a steel cord marked with defect information in another specific implementation manner of an embodiment of the present application.

[0037] Numbers in the figure

[0038] 11 magnetic field unit, 111 permanent magnet, 112 magnetic conductive plate, 22 signal acquisition unit, 221 magnetic sensor module, 2211 first magnetic sensitive element, 2212 second magnetic sensitive element, 222 differential module, 2220 differential circuit, 223 signal output module, 41 steel cord, 51 frame, 511 cover plate, 61 substrate, 70 signal connecting line. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments of the present application will be further described based on preferred implementation modes and with reference to the accompanying drawings.

[0040] In addition, various components on the drawings are enlarged (thickened) or reduced (thinned) for ease of understanding, but this practice is not intended to limit the scope of protection of the present application.

[0041] Words importing the singular also include the plural and vice versa.

[0042] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the embodiment is usually placed when in use, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, in order to distinguish different units, the words "first", "second", etc. are used in this specification, but these are not limited by the order of manufacture, nor can they be understood as indicating or implying relative importance, and their names may be different in the detailed description and claims of the present application.

[0043] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a connection between the two components. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0044] In order to better illustrate the technical solution of the embodiment of the present application, we first combine Figure 1 The working principle of magnetic field signal acquisition by magnetic sensitive elements is introduced.

[0045] Figure 1 It is the electrical schematic diagram of the magnetic field signal obtained by the magnetic sensor, such as Figure 1 As shown, the magneto-sensitive element is an element that can sense the magnetic field and convert the magnetic field signal into an electrical signal for output, and includes a magneto-sensitive resistor and a reference resistor connected in series, wherein the resistance Rs of the magneto-sensitive resistor changes with the change of the sensed magnetic field, and the resistance Rf of the reference resistor is a constant value.

[0046] When it is necessary to obtain magnetic field signals, the magnetic sensitive element is placed in the background magnetic field and Figure 1As shown in the figure, a voltage VDD is applied to one end of the magnetic sensitive element, and the other end is grounded, and an output voltage Vo is drawn from between the magnetic sensitive resistor and the reference resistor. At this time, the resistance value Rs of the magnetic sensitive resistor is the resistance value corresponding to the background magnetic field. According to the voltage division principle, Vo = VDD*Rf / (Rf+Rs), and the output voltage signal Vo is the signal reflecting the background magnetic field.

[0047] When an object containing magnetic material approaches and enters the background magnetic field, the movement of the magnetic material will cause the background magnetic field to change, which in turn causes Rs to change, and further causes the output voltage signal Vo to change. At this time, the output voltage signal Vo is the magnetic field signal that reflects the change in the position of each magnetic sensitive element.

[0048] In actual manufacturing and use, in order to obtain a wide-band magnetic field signal, a plurality of magnetically sensitive elements are generally arranged at intervals along a preset direction, and the magnetic field signals output by the plurality of magnetically sensitive elements are processed in parallel to be serially converted and output in the form of a serial magnetic field signal.

[0049] The following combination Figures 2 to 13 The specific implementation method of the embodiment of the present application is described in detail.

[0050] Figure 2 is a system block diagram of a steel cord defect detection device according to an embodiment of the present application, Figure 3 This is a three-dimensional diagram of an embodiment of the present application (the defect detection unit is not shown in the figure). Figure 4 This is an assembly side view of a specific implementation of an embodiment of the present application (the defect detection unit is not shown in the figure).

[0051] like Figures 2 to 4 As shown, an embodiment of the present application provides a steel cord defect inspection device for acquiring a reinforced magnetic field signal of a steel cord and detecting defects of the steel cord based on the reinforced magnetic field signal, comprising: a magnetic field unit 11, comprising a permanent magnet 111 for generating a background magnetic field, a signal acquisition unit 22, generating a reinforced magnetic field signal of the steel cord based on a plurality of first magnetic field signals and a plurality of second magnetic field signals, a defect detection unit, detecting defects of the steel cord based on the reinforced magnetic field signal, comprising an AD conversion module, a signal processing module, a defect detection module, a display module and a control module.

[0052] In a specific implementation of the embodiment of the present application, the magnetic field unit 11 and the signal acquisition unit 22 are fixedly installed in the frame 51 .

[0053] Specifically, in a specific implementation of the embodiment of the present application, a side of the frame 51 facing the steel cord 41 (in order to clearly explain the embodiment of the present application, the steel cord is represented by steel cords periodically distributed in the steel cord) can be provided with a limiting groove for accommodating and fixing the magnetic field unit 11 and the signal acquisition unit 22, and the signal acquisition unit 22 can be packaged on the circuit substrate 61, and the circuit substrate 61 is placed on the surface of the magnetic field unit 11 facing the steel cord 41. The magnetic field unit 11 may include a permanent magnet 111, whose long side is perpendicular to the movement direction of the steel cord 41, and may also include a plurality of permanent magnets distributed at intervals, and the spacing distribution direction is perpendicular to the movement direction of the steel cord 41.

[0054] Furthermore, if Figure 4 As shown, the magnetic field unit 11 may further include a magnetic conductive plate 112 . The magnetic conductive plate 112 is located on a surface of the permanent magnet 111 facing the steel cord fabric 41 . The magnetic conductive plate 112 is made of a magnetic conductive material.

[0055] Specifically, in an embodiment of the present application, the magnetic conductive plate 112 can be made of materials such as iron plate, ferrite alloy plate, Permalloy plate and / or silicon steel plate. The magnetic conductive plate 112 is located on the surface of the permanent magnet 111 facing the steel cord fabric 41, and is used to guide the magnetic lines of force generated by the permanent magnet 111 to make their strength and direction more evenly distributed.

[0056] Preferably, if Figure 4 As shown, the cross-sectional width of the permanent magnet 111 along the moving direction of the steel cord 41 is smaller than the spacing distance between adjacent steel cords of the steel cord 41 along the moving direction of the steel cord 41 .

[0057] Through the above arrangement, the magnetic field lines of the background magnetic field are concentrated in an interval period of the steel cord, which can eliminate the disturbance of the magnetic field caused by the steel cord outside the background magnetic field, thereby effectively reducing the influence of the interfering magnetic field.

[0058] The following combination Figures 3 to 6 The structure and technical solution of the signal acquisition unit 22 in the embodiment of the present application are described in detail. Figure 5 This is an electrical connection diagram of the signal acquisition unit 22 of an embodiment of the present application. Figure 6 2 is a working principle diagram of the signal acquisition unit 22 according to an embodiment of the present application.

[0059] like Figures 3 to 6As shown, the signal acquisition unit 22 includes: a magnetic sensor module 221, used to generate multiple first magnetic field signals and multiple second magnetic field signals, a differential module 222, connected to the magnetic sensor module 221, generating multiple differential magnetic field signals based on the multiple first magnetic field signals and the multiple second magnetic field signals, and a signal output module 223, connected to the differential module 222, including multiple input terminals and at least one output terminal for receiving multiple differential magnetic field signals, generating and outputting enhanced magnetic field signals based on the multiple differential magnetic field signals.

[0060] Furthermore, the magnetic sensor module 221 includes a plurality of first magnetic sensitive elements 2211, which are used to sense the magnetic field changes caused by the movement of the steel cord 41 in the background magnetic field and generate a plurality of first magnetic field signals; a plurality of second magnetic sensitive elements 2212, which are used to sense the magnetic field changes caused by the movement of the steel cord 41 in the background magnetic field and generate a plurality of second magnetic field signals; the plurality of first magnetic field signals and the plurality of second magnetic field signals are electrical signals.

[0061] Furthermore, the plurality of first magnetic sensitive elements 2211 and the plurality of second magnetic sensitive elements 2212 correspond one to one, and the spacing distance between each first magnetic sensitive element 2211 and the corresponding second magnetic sensitive element 2212 along the moving direction of the steel cord 41 is half of the spacing distance between adjacent steel cords of the steel cord 41 along the moving direction of the steel cord 41.

[0062] Furthermore, the plurality of first magnetic sensitive elements 2211 are distributed at intervals along a direction perpendicular to the moving direction of the steel cord 41 ; and the plurality of second magnetic sensitive elements 2212 are distributed at intervals along a direction perpendicular to the moving direction of the steel cord 41 .

[0063] Furthermore, the differential module 222 includes a plurality of differential circuits 2220 , and the plurality of differential circuits 2220 are connected to the plurality of first magnetic sensitive elements 2211 and the plurality of second magnetic sensitive elements 2212 in a one-to-one correspondence.

[0064] Furthermore, one end of the differential circuit 2220 is connected to the first magneto-sensitive element 2211 , the other end of the differential circuit 2220 is connected to the second magneto-sensitive element 2212 , and the output ends of the plurality of differential circuits 2220 are connected to the plurality of input ends of the signal output module 223 .

[0065] Specifically, in an embodiment of the present application, the magnetic sensor module 221 includes a plurality of pairs of first magnetic sensitive elements 2211 and second magnetic sensitive elements 2212, and the spacing distance between each pair of first magnetic sensitive elements 2211 and second magnetic sensitive elements 2212 along the movement direction of the steel cord 41 is M / 2, wherein M is the spacing distance between adjacent steel cords of the steel cord 41 along the movement direction of the steel cord 41; each first magnetic sensitive element 2211 outputs the magnetic field signal of its position in the form of an electrical signal V1 through a signal connection line 70 to one input end of a corresponding differential circuit 2220, and each second magnetic sensitive element 2212 outputs the magnetic field signal of its position in the form of an electrical signal V2 through a signal connection line 70 to another input end of a corresponding differential circuit 2220.

[0066] Multiple differential circuits 2220 perform differential processing on multiple V1 and V2 respectively to obtain multiple differential magnetic field signals V_diff. The output end of each differential circuit 2220 is connected to an input end of the signal output module 223 through a signal connection line 70, and is used to output the differential magnetic field signal V_diff to the signal output module 223.

[0067] The signal output module 223 includes multiple input terminals for receiving the above-mentioned multiple output differential magnetic field signals, and also includes at least one output terminal, as well as 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 signal output module 223 reads the multiple differential magnetic field signals V_diff in sequence under the synchronization of the clock signal CLK, performs parallel-to-serial processing to form a serial enhanced magnetic field signal V_ampli, and outputs it to the AD conversion module through the output terminal.

[0068] In some specific implementations of the embodiments of the present application, Figure 4 As shown, multiple first magnetic sensitive elements 2211 and multiple second magnetic sensitive elements 2212 are located on the side of the substrate 61 facing the steel cord 41, and multiple differential circuits 2220 and signal output modules 223 are located on the side of the substrate 61 facing away from the steel cord 41. The signal connection line 70 is not shown in the figure.

[0069] In some specific implementations of the embodiments of the present application, the signal output module 223 and the AD conversion module can be connected via a signal connection line 70. In other specific implementations of the embodiments of the present application, the signal output module 223 and the AD conversion module can also include a Bluetooth chip, which can be paired to wirelessly transmit the enhanced magnetic field signal V_ampli in the form of Bluetooth.

[0070] By setting the spacing distance between the first magnetic sensitive element 2211 and the second magnetic sensitive element 2212 along the moving direction of the steel cord 41 to half of the spacing distance M between adjacent steel cords of the steel cord 41 along the moving direction of the steel cord 41, that is, M / 2, the magnetic field signals V1 and V2 output by the first magnetic sensitive element 2211 and the second magnetic sensitive element 2212 are delayed by half a cycle, and then V1 and V2 are differentially processed by the differential circuit 2220, which can eliminate the influence of the background magnetic field in the magnetic field signal and the external interference magnetic field on the output magnetic field signal, and effectively amplify the amplitude of the magnetic field change caused by the steel cords in the steel cord 41 cutting the magnetic lines of force, thereby greatly improving the signal-to-noise ratio of the output enhanced magnetic field signal.

[0071] Figure 7 : is a magnetic field signal of the steel cord 41 in motion state detected by a single magnetic sensitive element, and the wireframe part in the figure is a magnetic field signal output in the presence of an interfering magnetic field; Figure 8 The magnetic field signal obtained by the paired first magnetic sensor 2211 and the second magnetic sensor 2212 in the embodiment of the present application is output after the difference is obtained. The change amplitude of the magnetic field signal in the figure is approximately equal to Figure 7 The change amplitude of the magnetic field signal is twice that of the background magnetic field signal, and the signal amplitude change caused by the interfering magnetic field is effectively eliminated, and the magnetic field signal of the background magnetic field is offset (it should be noted that Figure 8 The signal shown in the figure has a reference voltage because the voltage is raised to facilitate subsequent signal processing, not because of the background magnetic field.

[0072] At the same time, since the enhanced magnetic field signal is generated by differentially amplifying the magnetic field signals at two positions, it is only related to the difference between the magnetic field signals at the two positions, and has little to do with the specific magnetic field distribution. It can effectively solve the influence of the different placement positions of the magnetic field unit 11 on the induced and output magnetic field signals, so that the coordination mode of the magnetic field unit 11 and the signal acquisition unit 22 can be flexibly adjusted according to the detection purpose and actual detection conditions.

[0073] Fig. 9 It is an assembly side view of another specific implementation of the embodiment of the present application. In this specific implementation, the magnetic field unit 11 and the signal acquisition unit 22 are arranged on two sides of the steel cord 41 opposite to each other and are fixedly installed in the frame 51 respectively.

[0074] Fig.10This is an assembly side view of another specific implementation of the embodiment of the present application. In this specific implementation, there are two magnetic field units 11, which are arranged oppositely on both sides of the steel cord 41. The signal acquisition unit 22 is located between the connection line of the two magnetic field units 11 and on the surface of one of the magnetic field units 11 facing the steel cord 41. The magnetic field unit 11 and the signal acquisition unit 22 are both fixedly installed in the frame 51.

[0075] In some preferred implementations of the embodiments of the present application, Figure 4 , Fig. 9 , Fig.10 As shown, the surface of the frame 51 facing the steel cord 41 is a cover plate 511 , which is made of a material with high wear resistance and is used to protect the signal acquisition unit 22 and the magnetic field unit 11 and prevent wear on the steel cord 41 .

[0076] The following combination Figure 2 , Figures 11 to 13 The implementation of the defect detection unit in the embodiment of the present application is described in detail.

[0077] In the embodiments of the present application, Figure 2 As shown, the defect detection unit includes an AD conversion module, a signal processing module, a defect detection module, a display module and a control module.

[0078] Furthermore, if Fig.11 As shown in the system block diagram of the defect detection unit of the embodiment of the present application, the AD conversion module is connected to the signal output module 223 (the signal output module 233 is not shown), and converts the enhanced magnetic field signal into a digital magnetic field signal; the signal processing module processes the digital magnetic field digital signal to generate a magnetic field signal to be detected; the defect detection module analyzes the magnetic field signal to be detected, and generates a detection result of the steel cord 41 defect; the display module displays the signal to be detected and the detection result of the steel cord 41 defect; the control module is used to control the AD conversion module, the signal processing module, the defect detection module and the display module.

[0079] Specifically, in an embodiment of the present application, the AD conversion module can be connected to the signal output module 223 via a signal connection line 70, or can be connected to the signal output module 223 via a Bluetooth module in a Bluetooth connection manner to receive a serial enhanced magnetic field signal V_ampli; the AD conversion module can be an 8-bit AD converter, which converts the serial enhanced magnetic field signal V_ampli into a serial magnetic field digital signal D_ampli with an output range of 0-255 (256 levels in total), or it can be an AD converter with a higher bit number to divide the output range more finely.

[0080] The signal processing module may include a clock signal interface, which converts the magnetic field digital signal into a magnetic field signal to be detected in synchronization with the clock signal CLK.

[0081] The defect detection module analyzes the signal to be detected and generates a defect detection result of the steel cord 41 . The detection result may include information such as the location of the defect and the type of the defect.

[0082] The display module can be a display of a desktop computer or a screen of a tablet computer, a laptop computer, or other device, and is used to display the magnetic field signal to be detected and the defect detection result.

[0083] The control module can be a single chip microcomputer equipped with a control program or a processor of a desktop computer, tablet computer, or laptop computer, and is used to control the AD conversion module, the signal processing module, the defect detection module, and the display module.

[0084] Fig.12 A magnetic field square wave signal of a certain point on a steel cord fabric 41 on which defect information has been marked in a specific implementation manner of an embodiment of the present application is shown. In this specific implementation manner, the signal processing module generates magnetic field signals to be detected in the form of square waves at multiple positions by performing threshold judgment and binarization on the magnetic field digital signal D_ampli. The magnetic field detection module analyzes the square wave to generate a defect detection result, which may include the location and type of the defect. The display unit displays the magnetic field signals to be detected in the form of square waves at multiple positions and the defect detection results.

[0085] Fig.13 A magnetic image of a steel cord 41 with defect information marked in another specific implementation of an embodiment of the present application is shown. In this specific implementation, the signal processing module converts the serial digital magnetic field model D_ampli into a grayscale magnetic image of the steel cord 41 as a magnetic field signal to be detected. The magnetic field detection module analyzes the magnetic image to generate a defect detection result, which may include the location and type of the defect. The display unit displays the magnetic image of the steel cord 41 as the magnetic field signal to be detected and the defect detection result.

[0086] Furthermore, if Fig.11 As shown, the defect detection unit also includes: a calculation module, which determines defect marking information according to the detection result of the defect of the steel cord 41 and the movement speed of the steel cord 41, and the defect marking information includes marking position information and marking trigger time; a defect processing module, which marks the defect according to the defect marking information; and an alarm module, which is used to make an abnormal alarm.

[0087] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications may be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A steel cord defect detection device, used for obtaining a reinforced magnetic field signal of a steel cord and detecting defects of the steel cord based on the reinforced magnetic field signal, characterized in that: include: A magnetic field unit, comprising a permanent magnet for generating a background magnetic field; A signal acquisition unit, which generates an enhanced magnetic field signal of the steel cord based on a plurality of first magnetic field signals and a plurality of second magnetic field signals, comprises a magnetic sensor module, which is used to generate the plurality of first magnetic field signals and the plurality of second magnetic field signals, a differential module, which is connected to the magnetic sensor module, and generates a plurality of differential magnetic field signals based on the plurality of first magnetic field signals and the plurality of second magnetic field signals, and a signal output module, which is connected to the differential module, and comprises a plurality of input terminals and at least one output terminal for receiving the plurality of differential magnetic field signals, and generates and outputs the enhanced magnetic field signal based on the plurality of differential magnetic field signals; A defect detection unit, which detects defects of the steel cord based on the enhanced magnetic field signal, comprises an AD conversion module, a signal processing module, a defect detection module, a display module and a control module; The magnetic sensor module comprises: a plurality of first magnetic sensitive elements, used to sense the magnetic field changes caused by the movement of the steel cord in the background magnetic field and generate the plurality of first magnetic field signals; a plurality of second magnetic sensitive elements, used to sense the magnetic field changes caused by the movement of the steel cord in the background magnetic field and generate the plurality of second magnetic field signals; wherein the magnetic field changes are caused by the steel cords in the steel cords cutting the magnetic lines of force; The plurality of first magnetic sensitive elements correspond to the plurality of second magnetic sensitive elements in one-to-one correspondence.

2. The steel cord defect detection device according to claim 1, characterized in that: The plurality of first magnetic field signals and the plurality of second magnetic field signals are electrical signals.

3. The steel cord defect detection device according to claim 2, characterized in that: The spacing distance between each first magnetic sensitive element and the corresponding second magnetic sensitive element along the moving direction of the steel cord is half of the spacing distance between adjacent steel cords of the steel cord along the moving direction of the steel cord.

4. The steel cord defect detection device according to claim 3, characterized in that: The plurality of first magnetic sensitive elements are distributed at intervals along a direction perpendicular to the moving direction of the steel cord; The plurality of second magnetic sensitive elements are distributed at intervals along a direction perpendicular to the moving direction of the steel cord.

5. The steel cord defect detection device according to claim 4, characterized in that: The differential module includes a plurality of differential circuits, and the plurality of differential circuits are connected to the plurality of first magnetic sensitive elements and the plurality of second magnetic sensitive elements in a one-to-one correspondence; One end of the differential circuit is connected to the first magnetic sensitive element, the other end of the differential circuit is connected to the second magnetic sensitive element, and the output ends of the plurality of differential circuits are connected to the plurality of input ends of the signal output module.

6. The steel cord defect detection device according to claim 1, characterized in that: The magnetic field unit further comprises a magnetic conductive plate, which is located on a surface of the permanent magnet facing the steel cord fabric, and is made of a magnetic conductive material.

7. The steel cord defect detection device according to claim 1, characterized in that: The AD conversion module is connected to the signal output module and is used to convert the enhanced magnetic field signal into a digital magnetic field signal; The signal processing module processes the digital magnetic field digital signal to generate a magnetic field signal to be detected; The defect detection module analyzes the magnetic field signal to be detected to generate a detection result of the steel cord defect; The display module displays the signal to be detected and the detection result of the steel cord defect; The control module is used to control the AD conversion module, the signal processing module, the defect detection module and the display module.

8. The steel cord defect inspection device according to claim 7, characterized in that: The defect detection unit also includes: A calculation module, which determines defect marking information according to the detection result of the steel cord defect and the movement speed of the steel cord, wherein the defect marking information includes marking position information and marking triggering time; A defect processing module, marking defects according to the defect marking information; The alarm module is used for abnormal alarm.

9. The steel cord defect detection device according to any one of claims 1 to 8, characterized in that: The steel cord defect detection device also includes: The frame is used to fix the magnetic field unit and the signal acquisition unit in the frame.

10. The steel cord defect detection device according to claim 9, characterized in that: The surface of the frame body facing the steel cord fabric is a cover plate.

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