WO2023103276A1

WO2023103276A1 - Testing and calibration device and testing and calibration method for wire cord fabric

Info

Publication number: WO2023103276A1
Application number: PCT/CN2022/091912
Authority: WO
Inventors: 戚务昌; 林永辉; 姜利; 张凯
Original assignee: 威海华菱光电股份有限公司
Priority date: 2021-12-07
Filing date: 2022-05-10
Publication date: 2023-06-15
Also published as: CN114166930B; CN114166930A

Abstract

A testing and calibration device and a testing and calibration method for a wire cord fabric (4), for use in obtaining a testing signal for a wire cord fabric (4) and performing calibration by means of a calibration signal. The testing and calibration device for a wire cord fabric (4) comprises: a testing assembly, a slide rail assembly, and a support (3). The testing assembly comprises a magnetic sensor module (11). The magnetic sensor module (11) is not in the same plane as the wire cord fabric (4), and comprises a substrate (111), a plurality of magnetic sensitive elements (112), a processing unit (114) and a back magnetic unit (113). The slide rail assembly comprises a first slide rail (21) extending in a preset direction. The magnetic sensor module (11) overlaps the first slide rail (21) and can slide along the first slide rail (21) in a reciprocating manner. The support (3) is used for supporting and fixing the slide rail assembly. The testing and calibration device for a wire cord fabric (4) can effectively avoid the influence of magnetized steel cords in the wire cord fabric (4) on a testing device, and is convenient to operate, easy to implement and high in calibration precision.

Description

A steel cord detection and calibration device and detection and calibration method

technical field

The present application relates to the field of industrial non-destructive testing, in particular to a device and method capable of detecting defects in steel cord fabrics and calibrating the detection results.

Background technique

Steel cord is an important part of truck tires. It is composed of an outer rubber layer and steel cords arranged at equal intervals inside the rubber layer. 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.

In the existing non-destructive testing technology for steel cords, there is a device for detecting defects in steel cords based on magnetic images generated by arrayed magnetic sensitive elements, which usually includes an array magnetic field unit for generating initial excitation magnetic field signals; arrayed magnetic sensitive elements, Corresponding to the array magnetic field unit, it is used to detect multi-point magnetic field signal changes; the signal processing unit includes an AD conversion module and a data processing module; the AD conversion module is used to convert the magnetic field signal of the steel cord into a digital magnetic field of the steel cord signal; the data processing module is used to generate the magnetic image signal of the steel cord for subsequent judgment by the defect detection unit.

In this way of detection device, the discretization between the array magnetic sensitive elements causes the initial state of each magnetic sensitive element to be different, and the initial excitation magnetic field signal of the array magnetic field unit is not the same, resulting in that when there is no steel cord passing through each magnetic sensitive element The magnetic field is different, which eventually leads to the original output of each array magnetic sensor element is not the same when there is no steel cord passing through, which brings difficulties to the subsequent image defect detection. In addition, when the steel cord is continuously conveyed on the detection device, due to environmental changes and magnetization of the steel cord, it will cause continuous impact on the magnetic sensor and the magnetic field unit, resulting in a change in the initial excitation magnetic field, which makes the original output of the magnetic sensor deviate from the initial installation. value, resulting in uneven background magnetic images, which will greatly interfere with the judgment of the subsequent image defect detection unit, so online calibration of the detection device is required; since the detection device installed on the production line and with a fixed position is always affected by the steel cord , how to avoid the influence of the steel cord, conveniently and accurately calibrate the detection device, there is no feasible method proposed at present.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the purpose of this application is to provide a method that can combine the non-destructive testing process of the steel cord with the calibration process, and eliminate the influence of the magnetization of the steel cord on the calibration signal, so as to obtain a more accurate calibration signal. And a device and method for detecting signals after calibration.

One aspect of the present application provides a steel cord detection and calibration device, which is used to obtain the detection signal of the steel cord and perform calibration through the calibration signal. The width of the steel cord is perpendicular to the Z axis and along the X axis perpendicular to the Z axis. directional movement, the detection and calibration device includes:

A detection assembly, the detection assembly includes a magnetic sensor module, the magnetic sensor module is not in the same plane as the steel cord, including: a substrate, a plurality of magnetic sensitive elements, a processing unit and a magnetic unit facing away, the substrate is parallel to For the width of the steel cord, the plurality of magnetic sensitive elements are arranged at intervals along a predetermined direction on the surface of the substrate facing the steel cord, for obtaining the detection signal and the calibration signal, the The processing unit and the back-facing magnetic unit are arranged on the surface of the substrate facing away from the steel cord, the back-facing magnetic unit is arranged along the preset direction, and is used to generate an initial excitation magnetic field, and the processing unit electrically connected to the plurality of magnetic sensitive elements for processing the detection signal and the calibration signal;

a slide rail assembly, the slide rail assembly includes a first slide rail extending along the preset direction, the magnetic sensor module overlaps the first slide rail and can reciprocally slide along the first slide rail;

The bracket is used to support and fix the slide rail assembly.

Preferably, the preset direction is a Y-axis direction, and the Y-axis is respectively perpendicular to the X-axis and the Z-axis.

Further, the projection of the first slide rail on the web of the steel cord exceeds the edges of both sides of the web of the steel cord, and the length beyond one side is longer than that of the magnetic sensor module along the preset direction. length.

Preferably, the slide rail assembly and the bracket are made of non-magnetic and non-magnetized rigid material.

Preferably, the sliding rail assembly further includes: a sliding mechanism, the sliding mechanism includes a motor and a screw, the screw is parallel to the first sliding rail, and the motor is used to drive the screw to rotate; the receiving part, the The receiving part is fixedly connected with the magnetic sensor module, and is sleeved on the outside of the screw rod through a screw hole.

Further, the detection signal is a signal obtained by scanning the plurality of magnetic sensitive elements when the magnetic sensor module is located at a detection position, and the detection position satisfies the requirement that the magnetic sensor module is projected on the width of the steel cord. The position within; the calibration signal is the signal obtained by scanning the plurality of magnetic sensitive elements when the magnetic sensor module is located at the calibration position, and the calibration position satisfies the projection of the magnetic sensor module on the steel cord position outside the format.

Preferably, the slide rail assembly further includes: a detection positioning mark, which is set at one end of the slide rail assembly close to the steel cord, for positioning the magnetic sensor module to the detection position; a calibration positioning mark, which is set The end of the slide rail assembly away from the steel cord is used to position the magnetic sensor module to the calibration position.

Preferably, the detection assembly further includes a first opposing magnetic module, the first opposing magnetic module is arranged on the side of the steel cord facing away from the magnetic sensor module, and includes The first opposing magnetic unit; the slide rail assembly also includes a second slide rail parallel to and equal in length to the first slide rail, the first slide rail and the second slide rail are on the side of the steel cord The projections on the web are overlapped; the first opposing magnetic module is overlapped on the second slide rail and can reciprocally slide along the second slide rail.

Preferably, the first opposing magnetic module is positioned at the detection position; the detection assembly further includes a second opposing magnetic module, and the second opposing magnetic module is overlapped on the second slide rail and positioned at the calibration position; the second opposing magnetic module includes a second opposing magnetic unit arranged along the preset direction, the first opposing magnetic unit and the second opposing magnetic unit are strong The magnetic structure and the magnetic field characteristics of the second opposing magnetic unit are the same as those of the first opposing magnetic unit.

Preferably, the magnetic sensor module further includes a magnetic sensor module frame and a cover plate, and the magnetic sensor module frame is used to insert and fix the substrate, the plurality of magnetic sensitive elements, the processing unit and the facing away from the magnetic unit, the cover plate is located on the surface of the magnetic sensor module frame facing the steel cord; the first facing magnetic module also includes a first frame for inserting and fixing the The first opposing magnetic unit; the second opposing magnetic module further includes a second frame for placing and fixing the second opposing magnetic unit.

Another aspect of the present application also provides a detection and calibration method, using the above steel cord detection and calibration device to detect and calibrate the steel cord, the method includes the following steps:

S100: Stop the movement of the steel cord and the scanning of the magnetic sensor module and move the magnetic sensor module to a calibration position;

S200: Start the scanning of the magnetic sensor module, and obtain a calibration signal of each of the magnetic sensitive elements;

S300: Determine a calibration offset value of each of the magnetic sensitive elements according to the calibration signal and a preset calibration target value;

S400: Stop scanning the magnetic sensor module and move the magnetic sensor module to a detection position;

S500: Start the movement of the steel cord and the scanning of the magnetic sensor module, and obtain a detection signal of each of the magnetic sensitive elements;

S600: Determine a calibrated detection signal of each of the magnetic sensitive elements according to the detection signal and the calibration deviation value.

Further, the determining the calibration deviation value of each of the magnetic sensitive elements according to the calibration signal and the preset calibration target value is specifically: subtracting the calibration signal obtained by each of the magnetic sensitive elements from the calibration The target value obtains the calibration deviation value of each of the magnetic sensitive elements;

The determining the calibrated detection signal of each of the magnetic sensitive elements according to the detection signal and the calibration deviation value is specifically: subtracting the detection signal obtained by each of the magnetic sensitive elements from each of the magnetic sensitive elements The calibration offset value of the element obtains the calibrated detection signal of each said magnetic sensitive element.

Further, the detection position is a position satisfying that the magnetic sensor module is projected within the width of the steel cord; the calibration position is a position satisfying that the magnetic sensor module is projected outside the width of the steel cord.

Preferably, the steps S100 to S400 are executed before the first installed operation or when the operating environment changes causing the initial excitation magnetic field to change.

Preferably, the detection assembly further includes a first opposing magnetic module, the first opposing magnetic module is arranged on the side of the steel cord facing away from the magnetic sensor module, and includes The first opposing magnetic unit; the slide rail assembly also includes a second slide rail parallel to and equal in length to the first slide rail, the first slide rail and the second slide rail are on the side of the steel cord The projections on the web are coincident; the first opposing magnetic module is overlapped with the second slide rail, and the connection line between the first opposing magnetic module and the magnetic sensor module is always perpendicular to the Format.

Preferably, the detection assembly further includes a first opposing magnetic module and a second opposing magnetic module arranged on the side of the steel cord facing away from the magnetic sensor module, the first opposing magnetic module includes The first opposing magnetic unit arranged in the preset direction, the second opposing magnetic module includes a second opposing magnetic unit arranged in the preset direction, the first opposing magnetic unit and the second The opposing magnetic units are all strong magnetic structures and the magnetic field characteristics of the second opposing magnetic unit are the same as those of the first opposing magnetic unit; the slide rail assembly also includes The projections of the first slide rail and the second slide rail on the web of the steel cord coincide; the first opposing magnetic module and the second opposing magnetic module overlap on the second slide rail, and the first opposing magnetic module is positioned at the detection position, and the second opposing magnetic module is positioned at the calibration position.

A steel cord detection and calibration device and detection and calibration method provided in the embodiments of the present application have at least the following beneficial effects:

(1) The steel cord detection and calibration device and detection and calibration method provided by the embodiments of the application can correct the output initial value of each magnetic sensitive element, so that the initial value of each magnetic sensitive element in the sensor is roughly equal to the set target value, excluding the magnetic The signal fluctuation caused by the inhomogeneity of the sensitive element and the magnetic field unit makes the amplitude change of the final output signal only related to the shape, angle, spacing and other factors of the steel cord, and makes the detection signal of the steel cord and the subsequent generated magnetic field image background Uniform, effective information is prominent, improving the accuracy and reliability of detection.

(2) The calibration operation is performed by sliding the detection device out of the range of the steel cord width, which can effectively avoid the influence of the magnetized steel cord in the steel cord on the detection device, and is easy to operate, easy to implement, and high in calibration accuracy.

Description of drawings

Fig. 1 is a perspective view of the detection state of a steel cord detection and calibration device provided by an embodiment of the present application;

Fig. 2 is a perspective view of the calibration state of the steel cord detection and calibration device provided by an embodiment of the present application;

Fig. 3 is a side view of a steel cord detection and calibration device provided by an embodiment of the present application;

Fig. 4 is a perspective view of the detection state of the steel cord detection and calibration device provided by another embodiment of the present application;

Fig. 5 is a perspective view of the calibration state of the steel cord detection and calibration device provided by another embodiment of the present application;

Fig. 6 is a perspective view of the detection state of the steel cord detection and calibration device provided by another embodiment of the present application;

Fig. 7 is a perspective view of the calibration state of the steel cord detection and calibration device provided by another embodiment of the present application;

Fig. 8 is a side view of a steel cord detection and calibration device provided by another embodiment of the present application;

Fig. 9 is a perspective view of the detection state of the steel cord detection and calibration device provided by another embodiment of the present application;

Fig. 10 is a perspective view of the calibration state of the steel cord detection and calibration device provided by another embodiment of the present application;

Fig. 11 is a flowchart of a steel cord detection and calibration method provided by an embodiment of the present application;

Fig. 12 is a comparison between the calibrated detection signal obtained by the steel cord detection and calibration method provided in the embodiment of the present application and the uncalibrated detection signal.

Label in the figure

11: Magnetic sensor module, 111: Substrate, 112: Magnetic sensitive element, 113: Backward magnetic unit, 114: Processing unit, 115: Magnetic sensor module frame, 116: Cover plate, 12: First opposing magnetic module, 121: the first opposing magnetic unit, 122: the frame of the first opposing magnetic module, 13: the second opposing magnetic module, 21: the first sliding rail, 22: the second sliding rail, 23: detection and positioning marks, 24 : Calibration positioning mark, 3: Bracket, 4: Steel cord, 5: Accepting piece, 6: Sliding mechanism, 61: Motor, 62: Screw.

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 usual orientation or positional relationship of the products in the embodiments of the application when used, is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, in order to Specific orientation configurations and operations, therefore, are not to be construed as limitations on 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 titles in the detailed description of the application may be different from those in the claims.

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 specific meanings of the above terms in this application.

One aspect of the embodiment of the present application provides a steel cord detection and calibration device. Figure 1 and Figure 2 are perspective views of the steel cord detection and calibration device in different states according to a preferred embodiment of the present application, and Figure 3 is the above detection The side view of the calibration device, the steel cords 4 in the above drawings move under the drive of the transmission mechanism (not shown in the figure), in order to clearly illustrate the technical solution of the embodiment of the application, the steel cords 4 are arranged at equal intervals A plurality of steel cords indicates that the direction of their arrangement is the direction of movement of the steel cord 4, which is represented as the X-axis direction in the above-mentioned drawings; the normal direction of the width of the steel cord 4 is represented as the Z-axis direction in the above-mentioned drawings, and Z The axial direction is perpendicular to the X-axis direction.

As shown in Figures 1 to 3, the steel cord detection and calibration device provided by the embodiment of the present application includes a detection component, and the detection component includes a magnetic sensor module 11, and the magnetic sensor module 11 is not in the same plane as the steel cord 4, including: a substrate 111, a plurality of magnetic sensitive elements 112, a processing unit 114 and a magnetic unit 113 facing away, the substrate 111 is parallel to the web of the steel cord 4, and a plurality of magnetic sensitive elements 112 are arranged at intervals along the preset direction on the substrate 111 facing the steel cord The surface on one side of 4 is used to obtain detection signals and calibration signals. The processing unit 114 and the magnetic unit 113 facing away are arranged on the surface of the substrate 111 facing away from the side of the steel cord 4, and the magnetic units 113 facing away are arranged along a preset direction. For generating the initial excitation magnetic field, the processing unit 114 is electrically connected to the plurality of magnetic sensitive elements 112 for processing detection signals and calibration signals. In some preferred embodiments, the magnetic sensor module 11 also includes a magnetic sensor module frame body 115 and a cover plate 116, and the magnetic sensor module 11 is used to place and fix the above-mentioned substrate 111, magnetic sensitive element 112, processing unit 114 and rear-facing The magnetic unit 113 and the cover plate 116 are located on the surface of the magnetic sensor module frame body 115 facing the steel cord 4, and are used to protect the above-mentioned magnetic sensitive element 112; the above-mentioned substrate 111, the magnetic sensor module frame body 115 and the cover plate 116 are all made of non-magnetic And will not be made of magnetized material.

The specific structure and working principle of the magnetic sensor are known to those skilled in the art, and will not be repeated here.

Each magnetic sensitive element 112 of the magnetic sensor module 11 has its own initial value in the initial excitation magnetic field excited against the magnetic unit 113. When the steel cord 4 moves along the X-axis direction and passes through the initial excitation magnetic field, the steel wire in the steel cord 4 The cord causes disturbance to the initial excitation magnetic field and is acquired by the above-mentioned multiple magnetic sensitive elements 112. By processing and analyzing the changing magnetic field signal caused by the steel cord 4 acquired by the magnetic sensitive element 112, the steel cord in the steel cord 4 can be detected. However, there are at least the following problems in fixing the magnetic sensor module 11 to obtain the detection signal:

1) Since the initial state of each magnetic sensitive element 112 is different, the initial excitation magnetic field generated by the multiple magnets corresponding to the magnetic sensitive element 112 is also different, resulting in the magnetic field applied to the position of each magnetic sensitive element 112 when no steel cord 4 passes through. Different magnetic fields eventually lead to different original outputs of each magnetic sensitive element 112 when no steel cord 4 passes through, which brings difficulties to subsequent image defect detection;

2) In addition, when the steel cord 4 is continuously conveyed on the detection device, due to environmental changes, the magnetization of the steel cord in the steel cord 4 will cause continuous impact on the magnetic sensor 112 and the magnetic field unit, resulting in a change in the initial excitation magnetic field, The magnetic field signal output by the magnetic sensitive element 112 deviates from the initial installed value, thereby causing the background magnetic image to be uneven, which greatly interferes with the judgment of the subsequent image defect detection unit, and because there are still magnetized particles in the initial excitation magnetic field at this time Steel cords, therefore the above-mentioned problem cannot be solved by calibrating the magnetic sensor module 11 in a fixed position.

In order to solve the above problems, the detection device provided by the embodiment of the present application further includes a slide rail assembly and a bracket 3, the slide rail assembly includes a first slide rail 21 extending along a preset direction, and the magnetic sensor module 11 is overlapped on the first slide rail 21 and can reciprocally slide along the first slide rail 21; the bracket 3 is used to support and fix the slide rail assembly. Specifically, in some embodiments of the present application, as shown in FIG. 1 and FIG. 2 , the first sliding rail 21 is composed of two parallel and equal-length sliding rails, and the magnetic sensor module 11 is overlapped on the two sliding rails and Can reciprocally slide, the bracket 3 is fixed with the two ends of each slideway and forms a stable support; The sensor module 11 is adapted to the chute, and the magnetic sensor module 11 can slide reciprocally along the chute.

By arranging the above slide rail assembly, and making the magnetic sensor module 11 reciprocally slide along the first slide rail 21, the magnetic sensor module 11 acquires the detection signal and the calibration signal at different positions respectively, thereby eliminating the The influence of the magnetized steel cord on the calibration process is eliminated, the accuracy of the calibration signal is improved, and the reliability of the calibration of the detection signal is ensured.

In some preferred embodiments of the present application, as shown in FIG. 1 and FIG. 2 , the preset direction is the direction of the Y axis, and the Y axis is perpendicular to the X axis and the Z axis respectively.

In some preferred embodiments of the present application, the projection of the first slide rail 21 on the web of the steel cord 4 exceeds the edges of both sides of the web of the steel cord 4, and the length beyond one side is longer than that of the magnetic sensor module 11 along the predetermined The length of the setting direction, the above-mentioned setting can ensure that the magnetic sensor module 11 can reach any position of the width of the steel cord 4 when performing detection on the one hand, thereby expanding the detection range; It is completely out of the scope of the web of the steel cord 4, thereby eliminating the influence of the magnetized steel cord on the calibration process as much as possible.

In some preferred embodiments of the present application, the slide rail assembly and the bracket 3 are made of non-magnetic and non-magnetized rigid materials, such as non-magnetic aluminum alloy and other materials.

Fig. 1 and Fig. 2 respectively show schematic diagrams of the magnetic sensor module 11 in the detection position and in the calibration position in some preferred embodiments of the present application. As shown in Figure 1, the detection position is to satisfy the position within the width of the steel cord 4 projected by the magnetic sensor module 11. At this time, the magnetic field signal obtained by scanning the multiple magnetic sensitive elements 112 of the magnetic sensor module 11 is a detection signal; As shown in FIG. 2 , the calibration position is a position satisfying that the magnetic sensor module 11 is projected on a position other than the width of the steel cord 4. At this time, the magnetic field signals obtained by scanning the plurality of magnetic sensitive elements 112 of the magnetic sensor module 11 are calibration Signal.

As shown in Fig. 4 and Fig. 5, in some preferred embodiments of the present application, the slide rail assembly further includes: a sliding mechanism 6 and a receiving member 5, the sliding mechanism 6 includes a motor 61 and a screw 62, the screw 62 and the first slide The rails 21 are parallel, and the motor 61 is used to drive the screw 62 to rotate; the receiving part 5 is fixedly connected with the magnetic sensor module 11 , and is sleeved on the outside of the screw 62 through a screw hole. By setting the sliding mechanism 6 driven by the motor 61 , the magnetic sensor module 11 can be moved and positioned automatically and accurately.

In some preferred embodiments of the present application, as shown in FIG. 1 , FIG. 2 , FIG. 4 , and FIG. 5 , the slide rail assembly further includes a detection positioning mark 23 and a calibration positioning mark 24 . The detection positioning mark 23 is set on the end of the slide rail assembly close to the steel cord 4, and is used to position the magnetic sensor module 11 to the detection position; the calibration positioning mark 24 is set on the end of the slide rail assembly away from the steel cord 4, and is used to position the magnetic sensor module 11 to the detection position; 11 Locate to the calibration position.

In some preferred embodiments of the present application, as shown in FIGS. 6 to 8 , the detection assembly further includes a first opposing magnetic module 12 , and the slide rail assembly further includes a second slide rail 22 . The first opposing magnetic module 12 is arranged on the side of the steel cord 4 facing away from the magnetic sensor module 11, including the first opposing magnetic units 121 arranged along the Y-axis direction and used to insert and fix the first opposing magnetic units 121 The first opposing magnetic module frame body 122, the first opposing magnetic module frame body 122 is made of non-magnetic and non-magnetized material; the second slide rail 22 is parallel and equal to the first slide rail 21; The projections of the first sliding rail 21 and the second sliding rail 22 on the web of the steel cord 4 coincide; the first opposing magnetic module 12 is overlapped on the second sliding rail 22 and can reciprocate slide. Specifically, the setting method of the second slide rail 22 is the same as that of the first slide rail 21, and the support 3 is located at the two ends of the first slide rail 21 and the second slide rail 22, and the first slide rail 21 and the second slide rail 22 are Hold firmly.

The first opposing magnetic module 12 and the magnetic sensor module 11 are oppositely arranged on both sides of the web of the steel cord 4, and the first opposing magnetic unit 121 and the magnetic sensor module 11's back-facing magnetic unit 113 work together to generate an initial excitation magnetic field , the distribution of the magnetic lines of force is more uniform; in addition, the first opposing magnetic module 12 can reciprocate along the second slide rail 22, and when the magnetic sensor module 11 performs detection and calibration, it can keep the relative position with the magnetic sensor module 11 unchanged, thereby The consistency of the initial excitation magnetic field signal during detection operation and calibration operation is further improved.

In some preferred embodiments of the present application, as shown in Fig. 9 and Fig. 10, the first opposing magnetic module 12 is positioned at the detection position; the detection assembly also includes a second opposing magnetic module 13, and the second opposing magnetic module 13 overlaps the second slide rail 22 and is positioned at the calibration position; the second opposing magnetic module 13 includes a second opposing magnetic unit arranged along the Y-axis direction and a second opposing magnetic unit for placing and fixing the second opposing magnetic unit. Two opposing magnetic module frames, the second opposing magnetic module frame is made of non-magnetic and non-magnetized materials; the first opposing magnetic unit 121 and the second opposing magnetic unit are both strong magnetic structures and the second opposing magnetic unit The magnetic field characteristics of the two opposing magnetic units are the same as those of the first opposing magnetic unit 121 .

Both the first opposing magnetic unit 121 and the second opposing magnetic unit are of strong magnetic structure, and their exciting magnetic fields are not affected by the steel cords. They are constructed to have the same magnetic field characteristics and are respectively positioned at the detection position and the calibration position, which can be On the basis of ensuring the consistency of the detection operation and the calibration operation, the movable unit modules are reduced, so that the mechanical design of the device is simpler.

Another aspect of the embodiment of the present application provides a method for detecting and calibrating a steel cord, using the above-mentioned steel cord detecting and calibrating device to detect and calibrate the steel cord 4, and Fig. 11 is a flow chart of some preferred embodiments, as shown in Fig. 11 As shown, the above-mentioned steel cord detection and calibration method includes the following steps:

Further, in the embodiment of the present application, the calibration deviation value of each magnetic sensitive element 112 is determined according to the calibration signal and the preset calibration target value, specifically: the calibration signal obtained by each magnetic sensitive element 112 is subtracted from the calibration The target value obtains the calibration deviation value of each magnetic sensitive element 112;

Determine the calibrated detection signal of each magnetic sensitive element 112 according to the detection signal and the calibration deviation value, specifically: subtract the calibration deviation value of each magnetic sensitive element 112 from the detection signal obtained by each magnetic sensitive element 112 to obtain each magnetic sensitive element 112 The calibrated detection signal of the sensitive element 112.

In some preferred embodiments of the present application, the detection position is a position where the magnetic sensor module 11 is projected within the web of the steel cord 4; the calibration position is a position where the magnetic sensor module 11 is projected outside the web of the steel cord 4.

In some preferred embodiments of the present application, steps S100 to S400 are performed before the first installation and operation or when the initial excitation magnetic field changes due to changes in the operating environment.

In some preferred embodiments of the present application, the detection assembly further includes a first opposing magnetic module 12, and the first opposing magnetic module 12 is arranged on the side of the steel cord 4 facing away from the magnetic sensor module 11, including Arranged first opposing magnetic units 121; the slide rail assembly also includes a second slide rail 22 parallel to and equal to the first slide rail 21, and the first slide rail 21 and the second slide rail 22 are on the web of the steel cord 4 The projection coincides; the first opposing magnetic module 12 overlaps the second slide rail 22, and the connection line between the first opposing magnetic module 12 and the magnetic sensor module 11 is always perpendicular to the web of the steel cord 4.

In some preferred embodiments of the present application, the detection assembly further includes a first opposing magnetic module 12 and a second opposing magnetic module 13 arranged on the side of the steel cord 4 facing away from the magnetic sensor module 11, the first opposing magnetic module The module 12 includes a first opposing magnetic unit 121 arranged along a preset direction, the second opposing magnetic module 13 includes a second opposing magnetic unit arranged along a preset direction, the first opposing magnetic unit 121 and the second opposing magnetic unit 121 The magnetic units are all strong magnetic structures and the magnetic field characteristics of the second facing magnetic unit are the same as the first facing magnetic unit 121; the slide rail assembly also includes a second slide rail 22 parallel and equal to the first slide rail 21, The projections of the first slide rail 21 and the second slide rail 22 on the web of the steel cord 4 overlap; the first opposing magnetic module 12 and the second opposing magnetic module 13 overlap the second sliding rail 22, and the first opposing The magnetic module 12 is positioned at the detection position, and the second opposing magnetic module 13 is positioned at the calibration position.

The specific implementation of the technical solution of the present application will be described below in conjunction with multiple preferred embodiments.

Example 1

As shown in FIG. 4 and FIG. 5 , this embodiment provides a steel cord detection and calibration device, including a magnetic sensor module 11 , a first slide rail 21 , a sliding mechanism 6 , a receiving member 5 and a bracket 3 .

The magnetic sensor module 11 includes a substrate 111 made of PCB material. The substrate 111 is parallel to the width of the steel cord 4. On the surface of the substrate 111 facing the steel cord 4, 216 magnetic sensors are arranged at equal intervals of 0.5 mm along the Y axis. Component 112 forms an effective scanning width of 108mm and acquires detection signals and calibration signals, both of which are magnetic field signals, specifically, voltage signals reflecting the magnitude of the magnetic field; the surface of the substrate 111 facing away from the side of the steel cord 4 A magnetic unit 113 facing away and a processing unit 114 are provided, the magnetic unit 113 facing away comprises a plurality of magnets equidistantly arranged along the Y-axis direction, and the processing unit 114 is electrically connected with each magnetic sensitive element 112 through wires, and is used for digitizing the above-mentioned The detection signal and the calibration signal are processed by calculation, storage, and output. The processing unit 114 can also be connected with the subsequent magnetic image generation unit and defect detection unit to generate the magnetic field image of the steel cord according to the output calibration detection signal and identify the magnetic field image of the steel cord. Defect information; after the above-mentioned components are placed into the magnetic sensor module frame 115 and fixed, a detachable cover plate 116 is provided on the surface of the magnetic sensor module frame 115 facing the steel cord 4 side for the magnetic sensor 112 For protection, the distance between the cover plate 116 and the steel cord 4 is 2 mm; the base plate 111 , the magnetic sensor module frame 115 and the cover plate 116 are non-magnetic and will not be magnetized.

The first slide rail 21 extends along the Y axis, and its length covers the entire width of the steel cord 4, and the length beyond the edge of the steel cord 4 on one side is greater than the length of the magnetic sensor module 11 along the Y axis, and the two ends are fixed by the bracket 3; Both the first slide rail 21 and the bracket 3 are made of non-magnetic and non-magnetized aluminum alloy material.

The sliding mechanism 6 includes a screw 62 parallel to the first slide rail 21 and a motor 61 that drives the screw 62 to rotate. The magnetic sensor module 11 overlaps the first slide rail 21 and is fixedly connected to one end of the receiving member 5 . The other end is provided with a screw hole, covering the outside of the screw 62 , and the rotation of the motor 61 can drive the magnetic sensor module 11 to reciprocate along the first slide rail 21 to the detection position and the calibration position.

The detection position is that the projection of the magnetic sensor module 11 falls at a certain position within the width of the steel cord 4, and the calibration position is that the projection of the magnetic sensor module 11 falls at a certain position outside the width of the steel cord 4. In the actual production environment, The detection position and the calibration position are determined according to the size of the steel cord 4, the surrounding working conditions, etc., and are marked by the detection positioning mark 23 and the calibration positioning mark 24 arranged on the first slide rail 21, so as to ensure that each detection and calibration Consistency of conditions.

This embodiment also provides a method for detecting and calibrating the steel cord 4 using the above-mentioned detecting and calibrating device, which will be described in detail below with reference to FIG. 11 and FIG. 12 .

As shown in Figure 11, the method includes the following steps:

S100: Stop the movement of the steel cord and the scanning of the magnetic sensor module and move the magnetic sensor module to a calibration position.

Specifically, in this embodiment, the transmission mechanism of the steel cord 4 is closed to stop the movement of the steel cord 4, stop the scanning of the magnetic sensor module 11, and drive the screw 62 to rotate through the motor 61, so that the receiving part 5 drives the magnetic sensor module 11 along the first A sliding rail 21 moves and is positioned at a calibration position by a calibration positioning mark 24 .

S200: Start scanning of the magnetic sensor module, and acquire a calibration signal of each magnetic sensitive element.

Specifically, start the magnetic sensor module 11 of this embodiment, obtain the magnetic field signals of 216 magnetic sensitive elements 112 at the calibration position as the calibration signal, and the upper part of Fig. 12 shows the first 4 magnetic sensitive elements 112 as an example (Marked as pix1-pix4) The results (in digital signal form) of the acquired calibration signals are respectively Y1=140, Y2=100, Y3=120, Y4=130.

As shown in the upper part of Figure 12, the original output of each magnetic sensitive element 112 is different, and there are deviations. At this time, the image generated by scanning multiple lines has an extremely uneven background, which increases the difficulty of image processing and judgment. It is necessary to obtain its relative The deviation from the standard value is used for the next step of calibration.

S300: Determine a calibration offset value of each of the magnetic sensitive elements according to the calibration signal and a preset calibration target value.

The calibration target value is determined in advance according to the performance and specifications of the magnetic sensor 112 used in the magnetic sensor module 11. Specifically, in this embodiment, the calibration target value is set to 120, and 216 magnetic sensor elements 112 and the calibration target are calculated. The deviation of the value is used as the calibration deviation value of each magnetic sensitive element 112, taking pix1～pix4 as example, its calibration deviation value is respectively: A1=140-120=20, 2=100-120=-20, A3=120- 120=0, A4=130-120=10. The above calibration offset values are stored in the processing unit 114 for use in subsequent steps.

Specifically, in this embodiment, the scanning of the magnetic sensor module 11 is stopped, and the motor 61 drives the screw 62 to rotate, so that the receiving part 5 drives the magnetic sensor module 11 to move along the first slide rail 21 and is positioned to the detection position by detecting the positioning mark 23. location.

S500: Start the movement of the steel cord and the scanning of the magnetic sensor module to obtain a detection signal of each of the magnetic sensitive elements.

Specifically, in this embodiment, the transmission mechanism of the steel cord 4 is turned on to restore the movement of the steel cord 4, the scanning of the magnetic sensor module 11 is started, and the magnetic field signals of 216 magnetic sensitive elements 112 at the detection positions are obtained as detection signals, so as to Taking pix1-pix4 as an example, the detection signals obtained are respectively: C1, C2, C3, and C4.

Specifically, in this embodiment, the detection signals acquired by 216 magnetic sensitive elements 112 are subtracted from the corresponding calibration deviation values to obtain 216 calibrated detection signals. Taking pix1-pix4 as an example, the calibrated detection signals are respectively : Z1=(C1-A1), Z2=(C2-A2), Z3=(C3-A3), Z4=(C4-A4).

The above steps S100 to S400 are the steps to obtain the calibration information of the magnetic sensitive element 112, which is executed before the first installation and operation or every time the initial excitation magnetic field changes due to environmental changes, and the obtained calibration deviation value is stored in the processing unit 114 for The subsequent detection results are calibrated. Steps S500 and S600 are the steps of continuously detecting the steel cord 4. With the movement of the steel cord 4, the magnetic sensor continuously scans and uses the calibration deviation value to calibrate the detection results and output the post-calibration detection The above-mentioned calibrated detection signal can be processed by a subsequent magnetic image generation unit to generate a magnetic field image of the steel cord, and the defect information in it can also be identified by a subsequent defect detection unit.

The lower part of Fig. 12 also shows the output results after the calibration process is performed on the calibration signal obtained by the magnetic sensor 112 at the calibration position. Taking pix1-pix4 as an example, the calibrated results are respectively: Y1'=Y1-A1 =120, Y2'=Y2-A2=120, Y3'=Y3-A3=120, Y4'=Y4-A4=120, that is, the output value of the magnetic sensitive element 112 in the initial excitation magnetic field is uniformly calibrated to the target value, this The detection and calibration method of the embodiment eliminates signal fluctuations caused by the inhomogeneity of the magnetic sensitive element 112 and the magnetic field unit, so that the amplitude change of the final output signal is only related to factors such as the shape, angle, and spacing of the steel cords, and the steel cords The background of the detection signal of 4 and the subsequent generated magnetic field image are uniform, and the effective information is prominent, which improves the accuracy and reliability of detection.

Example 2

Embodiment 2 provides another embodiment of the steel cord detection and calibration device of the present application. FIG. 6 is a schematic diagram of this embodiment in a detection state, FIG. 7 is a schematic diagram of this embodiment in a calibration state, and FIG. 8 is a schematic diagram of this embodiment side view.

As shown in Figures 6 to 8, the difference between this embodiment and Embodiment 1 is that a first opposing magnetic module 12 and a second slide rail 22 are added, and the first opposing magnetic module 12 is arranged on the back side of the steel cord 4. One side of the magnetic sensor module 11 includes a first opposing magnetic unit 121 arranged along the Y-axis direction and a first opposing magnetic module frame 122 for inserting and fixing the first opposing magnetic unit 121, the first pair The magnetic module frame 122 is made of non-magnetic and non-magnetized material; the second slide rail 22 is parallel and equal to the first slide rail 21; The projections on the web are coincident; the first opposing magnetic module 12 is overlapped on the second slide rail 22 and can reciprocally slide along the second slide rail 22 .

When the detection and calibration device of this embodiment is used to detect the steel cord 4, the connecting line between the first opposing magnetic module 12 and the magnetic sensor module 11 is always perpendicular to the width of the steel cord 4, that is: the first opposing magnetic module 12 and the The magnetic sensor module 11 is arranged opposite to the steel cord 4 and moves synchronously.

Example 3

Embodiment 3 provides another embodiment of the steel cord detection and calibration device of the present application. FIG. 9 is a schematic diagram of this embodiment in a detection state, and FIG. 10 is a schematic diagram of this embodiment in a calibration state.

As shown in Figures 9 and 10, the difference between this embodiment and Embodiment 2 is that a second opposing magnetic module 13 is added. In this embodiment, the first opposing magnetic module 12 is positioned at the detection position, and the second The opposing magnetic module 13 is positioned at the calibration position, and includes a second opposing magnetic unit arranged along the Y axis and a second opposing magnetic module frame for placing and fixing the second opposing magnetic unit. The module frame is made of non-magnetic and non-magnetized material, the first magnetic unit and the second magnetic unit are both of strong magnetic structure, and have the same magnetic field characteristics.

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 detection and calibration device for steel cords, used to obtain detection signals for steel cords and perform calibration through the calibration signals. The width of the steel cords is perpendicular to the direction of the Z axis and moves along the direction of the X axis perpendicular to the direction of the Z axis. It is characterized in that the steel cord detection and calibration device includes:

A detection assembly, the detection assembly includes a magnetic sensor module, the magnetic sensor module is not in the same plane as the steel cord, including: a substrate, a plurality of magnetic sensitive elements, a processing unit and a magnetic unit facing away, the substrate is parallel to For the width of the steel cord, the plurality of magnetic sensitive elements are arranged at intervals along a predetermined direction on the surface of the substrate facing the steel cord, for obtaining the detection signal and the calibration signal, the The processing unit and the back-facing magnetic unit are arranged on the surface of the substrate facing away from the steel cord, the back-facing magnetic unit is arranged along the preset direction, and is used to generate an initial excitation magnetic field, and the processing unit electrically connected to the plurality of magnetic sensitive elements for processing the detection signal and the calibration signal;

a slide rail assembly, the slide rail assembly includes a first slide rail extending along the preset direction, the magnetic sensor module overlaps the first slide rail and can reciprocally slide along the first slide rail;

The bracket is used to support and fix the slide rail assembly.
The steel cord detection and calibration device according to claim 1, characterized in that:

The preset direction is a Y-axis direction, and the Y-axis is respectively perpendicular to the X-axis and the Z-axis.
The steel cord detection and calibration device according to claim 1, characterized in that:

The projection of the first sliding rail on the web of the steel cord exceeds the edges of both sides of the web of the steel cord, and the length beyond one side is greater than the length of the magnetic sensor module along the preset direction.
The steel cord detection and calibration device according to claim 1, characterized in that:

The slide rail assembly and the bracket are made of non-magnetic and non-magnetized rigid material.
The steel cord detection and calibration device according to claim 1, wherein the slide rail assembly further comprises:

a sliding mechanism, the sliding mechanism includes a motor and a screw, the screw is parallel to the first slide rail, and the motor is used to drive the screw to rotate;

A receiving part, the receiving part is fixedly connected with the magnetic sensor module, and is sleeved on the outside of the screw rod through a screw hole.
The steel cord detection and calibration device according to claim 1, characterized in that:

The detection signal is a magnetic field signal obtained by scanning the plurality of magnetic sensitive elements when the magnetic sensor module is located at a detection position, and the detection position is such that the magnetic sensor module is projected within the width of the steel cord Location;

The calibration signal is a magnetic field signal obtained by scanning the plurality of magnetic sensitive elements when the magnetic sensor module is located at a calibration position, and the calibration position is such that the magnetic sensor module is projected outside the width of the steel cord. Location.
The steel cord detection and calibration device according to claim 6, wherein the slide rail assembly further comprises:

A detection positioning mark is set at one end of the slide rail assembly close to the steel cord, and is used to position the magnetic sensor module to the detection position;

The calibration positioning mark is arranged on the end of the slide rail assembly away from the steel cord, and is used for positioning the magnetic sensor module to the calibration position.
The steel cord detection and calibration device according to claim 6 or claim 7, characterized in that:

The detection assembly also includes a first opposing magnetic module, the first opposing magnetic module is arranged on the side of the steel cord facing away from the magnetic sensor module, and includes a first pair of magnetic sensors arranged along the preset direction. to the magnetic unit;

The slide rail assembly also includes a second slide rail parallel to and equal in length to the first slide rail, and the projections of the first slide rail and the second slide rail on the web of the steel cord coincide;

The first opposing magnetic module overlaps the second slide rail and can reciprocally slide along the second slide rail.
The steel cord detection and calibration device according to claim 8, characterized in that:

The first opposing magnetic module is positioned at the detection position;

The detection assembly also includes a second opposing magnetic module, the second opposing magnetic module overlaps the second slide rail and is positioned at the calibration position;

The second opposing magnetic module includes second opposing magnetic units arranged along the preset direction;

Both the first opposing magnetic unit and the second opposing magnetic unit are ferromagnetic structures, and the magnetic field characteristics of the second opposing magnetic unit are the same as those of the first opposing magnetic unit.
A steel cord detection and calibration device as claimed in claim 9, characterized in that:

The magnetic sensor module also includes a magnetic sensor module frame and a cover plate, and the magnetic sensor module frame is used to insert and fix the substrate, the plurality of magnetic sensitive elements, the processing unit and the back surface. The magnetic unit, the cover plate is located on the surface of the magnetic sensor module frame facing the steel cord;

The first opposing magnetic module further includes a first frame for placing and fixing the first opposing magnetic unit;

The second opposing magnetic module further includes a second frame for placing and fixing the second opposing magnetic unit.
A detection and calibration method, using the steel cord detection and calibration device according to claim 1 to detect and calibrate the steel cord, characterized in that the method comprises the following steps:

S100: Stop the movement of the steel cord and the scanning of the magnetic sensor module and move the magnetic sensor module to a calibration position;

S200: Start the scanning of the magnetic sensor module, and obtain a calibration signal of each of the magnetic sensitive elements;

S300: Determine a calibration offset value of each of the magnetic sensitive elements according to the calibration signal and a preset calibration target value;

S400: Stop scanning the magnetic sensor module and move the magnetic sensor module to a detection position;

S500: Start the movement of the steel cord and the scanning of the magnetic sensor module, and obtain a detection signal of each of the magnetic sensitive elements;

S600: Determine a calibrated detection signal of each of the magnetic sensitive elements according to the detection signal and the calibration deviation value.
The detection and calibration method according to claim 11, characterized in that:

The determination of the calibration offset value of each of the magnetic sensitive elements according to the calibration signal and the preset calibration target value is specifically: subtracting the calibration target value from the calibration signal obtained by each of the magnetic sensitive elements to obtain a calibration offset value for each of said magnetic sensitive elements;

The determining the calibrated detection signal of each of the magnetic sensitive elements according to the detection signal and the calibration deviation value is specifically: subtracting the detection signal obtained by each of the magnetic sensitive elements from each of the magnetic sensitive elements The calibration offset value of the element obtains the calibrated detection signal of each said magnetic sensitive element.
The detection and calibration method according to claim 11, characterized in that:

The detection position is a position satisfying that the projection of the magnetic sensor module is within the width of the steel cord;

The calibration position is a position satisfying that the projection of the magnetic sensor module is outside the width of the steel cord.
The detection and calibration method according to claim 11, characterized in that:

The steps S100 to S400 are executed before the first installation and operation or when the initial excitation magnetic field changes due to changes in the operating environment.
The detection and calibration method according to any one of claims 11 to 14, characterized in that:

The detection assembly also includes a first opposing magnetic module, the first opposing magnetic module is arranged on the side of the steel cord facing away from the magnetic sensor module, and includes a first pair of magnetic sensors arranged along the preset direction. to the magnetic unit;

The slide rail assembly also includes a second slide rail parallel to and equal in length to the first slide rail, and the projections of the first slide rail and the second slide rail on the web of the steel cord coincide;

The first opposing magnetic module is overlapped with the second slide rail, and the connecting line between the first opposing magnetic module and the magnetic sensor module is always perpendicular to the web of the steel cord.
The detection and calibration method according to any one of claims 11 to 14, characterized in that:

The detection assembly also includes a first opposing magnetic module and a second opposing magnetic module arranged on the side of the steel cord facing away from the magnetic sensor module, the first opposing magnetic module includes The first opposing magnetic unit arranged in a direction, the second opposing magnetic module includes a second opposing magnetic unit arranged in the preset direction, the first opposing magnetic unit and the second opposing magnetic unit The units are all strong magnetic structures and the magnetic field characteristics of the second opposing magnetic unit are the same as those of the first opposing magnetic unit;

The slide rail assembly also includes a second slide rail parallel to and equal in length to the first slide rail, and the projections of the first slide rail and the second slide rail on the web of the steel cord coincide;

The first opposing magnetic module and the second opposing magnetic module are overlapped on the second slide rail, and the first opposing magnetic module is positioned at the detection position, and the second opposing magnetic module A module is positioned in the calibration position.