CN111272061B - Nondestructive testing device and method for box-shaped transformer eddy current of tin foil paper in carton - Google Patents
Nondestructive testing device and method for box-shaped transformer eddy current of tin foil paper in carton Download PDFInfo
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Abstract
The invention discloses a box-shaped transformer eddy current nondestructive testing device and method for tin foil paper inside a paper box, wherein the device comprises a conveying mechanism, an installation rack, an eddy current displacement sensor, a data acquisition card and an upper computer, wherein the eddy current displacement sensor is used for measuring the relative position of the tin foil paper box inside the to-be-tested encapsulation paper box and the end face of a probe in conveying, and converting the relative position into a corresponding electric signal to be output; the data acquisition card is used for acquiring the electric signal converted by the eddy current displacement sensor; and the upper computer is connected with the data acquisition card and is used for comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in the electric signal and judging whether the surface of the paper box is deformed. According to the device and the method for nondestructive testing of the box-shaped power transformation eddy current of the tin foil paper in the paper box, the deformation of the tin foil paper box in the paper box is detected in a harmless nondestructive testing mode, and whether the two sides of the paper box before and after entering a detection point are deformed or not is analyzed by adopting the angle of the slope, so that the detection precision and accuracy are improved.
Description
Technical Field
The invention relates to the field of eddy current nondestructive testing, and particularly discloses a tin foil paper box-shaped transformer eddy current nondestructive testing device and method inside a paper box.
Background
In high-grade food and commodity products, the requirement on packaging is extremely high, but when a paper box containing inner-layer tin foil paper is pressed into a packaging paper box to be detected by an automatic packaging line, the paper box is occasionally deformed, and the product quality and the packaging attractiveness are affected, so that a harmless nondestructive detection method is required to be adopted for finished product detection before product delivery and unqualified products are removed.
Patent document No. 201720855697.X discloses a cigarette case extrusion detection and aluminum-foil paper breakage detection device for a packaging machine, wherein cigarette cases are conveyed through a conveying belt and are detected through a door frame type mounting frame, and an inductive proximity switch is used for detecting breakage of the aluminum-foil paper and a radiation type optical fiber sensor is used for detecting extrusion of the cigarette cases. However, this technique can only detect the through deformation of the cigarette case, and cannot detect the non-through local deformation of the cigarette case, and the local deformation of the cigarette case may occasionally occur by being pressed when the cigarette case is loaded into the packing box, but the extrusion detection of the cigarette case by this technique is disabled due to the shielding of the packing box.
Patent No. 201220740184.1 discloses an imaging detection device for small cigarette case packages, which conveys cigarette cases at a fixed distance by a conveying mechanism, and realizes imaging detection of three surfaces of cigarette cases by matching a camera and a reflector. However, the technology detects the shape of a single cigarette case more comprehensively, but the deformation of the cigarette case is possibly caused in the process of loading the cigarette case into the packaging carton to be detected, and the quality of the packaged cigarette case cannot be detected due to the fact that the shielding camera of the packaging carton to be detected cannot detect the cigarette case in the packaging carton to be detected.
Therefore, the existing product packaging box deformation detection device is only limited to the detection of the shape quality of the paper box before packaging, but in an automatic production line, when the packaging box is packaged into the packaging paper box to be detected, the packaging box is extruded with the side wall of the packaging paper box to be detected and the included angle between the side walls of the packaging paper box to be detected, sometimes the packaging box is deformed, and the existing nondestructive packaging box detection technology fails due to the shielding of the packaging paper box to be detected, so that the technical problem to be solved urgently is solved.
Disclosure of Invention
The invention provides a nondestructive testing device and a nondestructive testing method for box-shaped power transformation eddy currents of tin foil paper in a paper box, and aims to solve the technical problem that the existing product packaging box deformation testing device is only limited to the detection of the shape quality of the paper box before packaging.
According to one aspect of the invention, a box-shaped variable eddy current nondestructive testing device for tin foil paper inside a paper box comprises a conveying mechanism, a mounting rack, an eddy current displacement sensor, a data acquisition card and an upper computer, wherein,
the conveying mechanism is used for conveying the packaging carton to be detected;
the mounting rack is mounted on the conveying mechanism;
the eddy current displacement sensor is arranged on the mounting rack and used for measuring the relative position of the tin foil paper box in the to-be-detected packaging paper box in conveying and the end face of the probe, and converting the relative position into a corresponding electric signal to be output;
the data acquisition card is electrically connected with the eddy current displacement sensor and is used for acquiring the electric signal converted by the eddy current displacement sensor;
and the upper computer is connected with the data acquisition card and is used for comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in an electric signal acquired by the data acquisition card and judging whether the surface of the paper box is deformed.
Further, the voltage mapping table maps the corresponding relation between the relative position and the voltage threshold;
the upper computer comprises a comparison module and a judgment module,
the comparison module is used for acquiring the relative position of the tin foil paper box in the to-be-detected packaging paper box during conveying and the end face of the probe, finding a voltage threshold matched with the relative position in a voltage mapping table, and comparing the voltage threshold with a voltage value in an electric signal;
the judging module is used for judging the surface deformation of the paper box if the voltage value is larger than the voltage threshold value; and if the voltage value is less than or equal to the voltage threshold range, judging that the surface of the paper box is not deformed.
Further, the upper computer also comprises a first judgment module,
the first judgment module is used for acquiring slopes of two groups of data on two sides of a tin foil paper box in the to-be-detected packaging paper box during conveying and comparing the acquired slopes with a preset slope threshold; if the obtained slope is larger than the slope threshold, judging that the two side edges of the paper box deform; and if the obtained slope is less than or equal to the slope threshold, judging that the two side edges of the carton are not deformed.
Further, the upper computer comprises a sorting module, a selecting module, a fitting module, a second judging module and a comparing and judging module,
the sorting module is used for combining the acquired relative position with the voltage value in the electric signal to obtain a data point set, and sorting the data point set from small to large by taking the voltage value in the electric signal as a reference;
the selecting module is used for selecting the sorted data point set of which the voltage values in the electric signals belong to a set interval;
the fitting module is used for fitting the data point set in the set interval by using a least square method to obtain a linear function; adding the voltage threshold value into the linear function to obtain a self-adaptive threshold value function;
the second judgment module is used for judging whether the surface data of the paper box in the data set falls above the self-adaptive threshold function or not, and if so, judging that the surface of the paper box deforms;
the comparison and judgment module is used for extracting two groups of data on two sides of the paper box in the data point set if the data point set is not the same as the data point set, comparing the slope with a slope threshold value by calculating the slopes of the two groups of data, and judging that the two sides of the paper box are not deformed if the slope is greater than or equal to the slope threshold value; and if the slope is smaller than the slope threshold value, judging that the two side edges of the paper box deform.
Further, the eddy current displacement sensor comprises a probe and a front-end device,
the probe is arranged on the mounting rack and used for measuring the relative position of the tin foil paper box in the to-be-detected packaging paper box during conveying and the end face of the probe;
and the front-end device is electrically connected with the probe and is used for converting the relative position measured by the probe into a corresponding electric signal and outputting the electric signal.
Further, the pre-amplifier comprises an oscillator, a detection circuit, an amplification circuit and a linear compensation unit, wherein the oscillator is electrically connected with the probe and used for generating sine waves;
the detection circuit is electrically connected with the oscillator and is used for converting the alternating current signal into a direct current signal;
the amplifying circuit is electrically connected with the detection circuit and is used for amplifying the direct current signal converted by the detection circuit;
and the linear compensation unit is respectively electrically connected with the oscillator and the amplifying circuit and is used for compensating the measured relative position into a linear relation in the measuring range of the probe.
According to another aspect of the present invention, there is further provided a nondestructive testing method for box-shaped transformer eddy current in a carton, which is applied to the nondestructive testing device for box-shaped transformer eddy current in a carton, and the nondestructive testing method for box-shaped transformer eddy current in a carton comprises the following steps:
measuring the relative position of a tin foil paper box in the to-be-detected packaging paper box and the end face of the probe in conveying by using an eddy current displacement sensor, and converting the relative position into a corresponding electric signal to be output;
acquiring an electric signal converted by the eddy current displacement sensor by using a data acquisition card;
and comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in an electric signal acquired by the data acquisition card through the upper computer, and judging whether the surface of the paper box is deformed.
Further, the step of comparing the voltage threshold value in the preset voltage mapping table with the voltage value in the electric signal collected by the data acquisition card through the upper computer to judge whether the surface of the paper box is deformed comprises the following steps:
acquiring the relative position of a tin foil paper box in a to-be-detected packaging paper box in conveying and the end face of a probe, finding a voltage threshold matched with the relative position in a voltage mapping table, and comparing the voltage threshold with a voltage value in an electric signal;
if the voltage value is larger than the voltage threshold value, judging that the surface of the paper box deforms; and if the voltage value is less than or equal to the voltage threshold range, judging that the surface of the paper box is not deformed.
Further, if the voltage value is larger than the voltage threshold value, judging that the surface of the paper box deforms; if the voltage value is less than or equal to the voltage threshold range, the step of determining that the surface of the paper box is not deformed further comprises the following steps:
acquiring slopes of two groups of data on two sides of a tin foil paper box in a to-be-detected packaging paper box during conveying, and comparing the acquired slopes with a preset slope threshold; if the obtained slope is larger than the slope threshold, judging that the two side edges of the paper box are not deformed; and if the obtained slope is less than or equal to the slope threshold, judging that the two side edges of the carton deform.
Further, the step of comparing the voltage threshold value in the preset voltage mapping table with the voltage value in the electric signal collected by the data acquisition card through the upper computer to judge whether the surface of the paper box is deformed comprises the following steps:
combining the obtained relative position with the voltage value in the electric signal to obtain a data point set, and sequencing the data point set from small to large by taking the voltage value in the electric signal as a reference;
selecting a data point set which is sequenced and the voltage value in the electric signal belongs to a set interval;
fitting a data point set in a set interval by using a least square method to obtain a linear function; adding the voltage threshold value into the linear function to obtain a self-adaptive threshold value function;
judging whether the surface data of the paper box in the data set falls above the self-adaptive threshold function or not, and if so, judging that the surface of the paper box deforms; if not, extracting two groups of data on two sides of the paper box in the data point set, comparing the slope with a slope threshold value by calculating the slopes of the two groups of data, and if the slope is greater than or equal to the slope threshold value, judging that the two sides of the paper box are not deformed; and if the slope is smaller than the slope threshold value, judging that the two side edges of the paper box deform.
The beneficial effects obtained by the invention are as follows:
the invention provides a box-shaped transformer eddy current nondestructive testing device and method for tin foil paper inside a paper box, wherein the device adopts a conveying mechanism, an installation rack, an eddy current displacement sensor, a data acquisition card and an upper computer, measures the relative position of the tin foil paper box inside the to-be-tested packaged paper box and the end face of a probe in conveying through the eddy current displacement sensor, and converts the relative position into a corresponding electric signal to output; acquiring an electric signal converted by the eddy current displacement sensor by using a data acquisition card; and the upper computer is adopted to compare the voltage threshold value in the preset voltage mapping table with the voltage numerical value in the electric signal acquired by the data acquisition card, and whether the paper box deforms or not is judged. According to the device and the method for nondestructive testing of the box-shaped power transformation eddy current of the tin foil paper in the paper box, the deformation of the tin foil paper box in the paper box is detected in a harmless nondestructive testing mode, and whether the two sides of the paper box before and after entering a detection point are deformed or not is analyzed by adopting the angle of the slope, so that the detection precision and accuracy are improved; compared with the quality control of manual sampling detection, the eddy current nondestructive carton deformation detection technology is based on the comprehensive investigation, and the quality control capability is greatly improved; compared with manual quality control, the eddy current detection nondestructive carton deformation detection technology realizes product quality control under the condition that products are not damaged, and reduces product detection loss cost.
Drawings
FIG. 1 is a functional block diagram of a nondestructive testing device for box-shaped electric eddy current of tin foil paper inside a paper box according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of a box-shaped electric eddy current nondestructive testing apparatus for tinfoil paper inside a carton according to the present invention;
FIG. 3 is a functional block diagram of a first embodiment of the upper computer in FIG. 1;
FIG. 4 is a functional block diagram of a second embodiment of the upper computer in FIG. 1;
FIG. 5 is a functional block diagram of a third embodiment of the upper computer in FIG. 1;
FIG. 6 is a functional block diagram of a nondestructive testing device for box-shaped electric eddy current of tin foil paper inside a paper box according to a second embodiment of the present invention;
FIG. 7 is a schematic view of a detection image of a box-shaped electric eddy current nondestructive detection device for tinfoil paper inside a carton according to the present invention;
FIG. 8 is a schematic flow chart of a nondestructive testing method for box-shaped eddy current testing of tin foil paper inside a carton according to a first embodiment of the present invention;
FIG. 9 is a detailed flowchart of the first embodiment of step S300 in FIG. 8;
FIG. 10 is a detailed flowchart of the second embodiment of step S300 in FIG. 8;
FIG. 11 is a schematic flow chart of a nondestructive testing method for box-shaped eddy current testing of tin foil paper inside a paper box according to a second embodiment of the present invention;
fig. 12 is a schematic flow chart of a nondestructive testing method for box-shaped electrical eddy current of tin foil paper inside a paper box according to a third embodiment of the present invention.
The reference numbers illustrate:
10. a conveying mechanism; 20. installing a frame; 30. an eddy current displacement sensor; 40. a data acquisition card; 50. an upper computer; 51. a comparison module; 52. a decision module; 53. a first judgment module; 54. a sorting module; 55. selecting a module; 56. a fitting module; 57. a second judgment module; 58. a comparison and judgment module; 31. a probe; 32. a pre-positioning device; 321. an oscillator; 322. a detection circuit; 323. an amplifying circuit; 324. a linear compensation unit; 100. packaging a carton to be tested; 200. a carton.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
As shown in fig. 1 and fig. 2, the present invention provides a tin foil paper box-shaped transformer eddy current nondestructive testing apparatus inside a paper box, which includes a conveying mechanism 10, an installation rack 20, an eddy current displacement sensor 30, a data acquisition card 40 and an upper computer 50, wherein the conveying mechanism 10 is used for conveying an encapsulated paper box 100 to be tested; the mounting frame 20 is mounted on the conveying mechanism 10; the eddy current displacement sensor 30 is arranged on the mounting rack 20 and used for measuring the relative position of the tin foil paper box 200 in the to-be-detected packaging paper box 100 during conveying and the end face of the probe, and converting the relative position into a corresponding electric signal to be output; the data acquisition card 40 is electrically connected with the eddy current displacement sensor 30 and is used for acquiring the electric signal converted by the eddy current displacement sensor 30; the upper computer 50 is connected with the data acquisition card 40 and is used for comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in an electric signal acquired by the data acquisition card 40 and judging whether the surface of the paper box 200 is deformed. In the present embodiment, the correspondence between the relative position and the voltage threshold is mapped in the voltage map, and the voltage threshold in the voltage map changes with the change in the relative position (paper cassette reference surface). The eddy current displacement sensor 30 can statically and dynamically measure the distance between the measured metal conductor and the probe in a non-contact manner with high linearity and high resolution, and is a non-contact linear metering tool.
The inside tin foil paper box-shaped power transformation eddy current nondestructive test device of carton that this embodiment provided, its theory of operation is:
the distance between the detection point of the tin foil paper and the probe 31 and the output voltage of the eddy current sensor 30 are in a linear relationship, when the paper box 200 deforms, the tin foil paper is extruded and deformed by the paper box, and the output voltage of the eddy current sensor 30 is greatly changed when the tin foil paper passes through the deformation position, so that whether the surface of the paper box 200 deforms or not is detected.
Referring to fig. 1 to 3, fig. 3 is a functional block diagram of a first embodiment of the upper computer in fig. 1, in this embodiment, the upper computer 50 includes a comparison module 51 and a determination module 52, where the comparison module 51 is configured to obtain a relative position between a tin foil paper box and an end surface of a probe in an encapsulation paper box 100 to be detected during transportation, find a voltage threshold matched with the relative position in a voltage mapping table, and compare the voltage threshold with a voltage value in an electrical signal; the determination module 52 is configured to determine that the surface of the paper box 200 is deformed if the voltage value is greater than the voltage threshold; if the voltage value is less than or equal to the voltage threshold range, it is determined that the carton surface 200 is not deformed.
Referring to fig. 4, fig. 4 is a functional block diagram of a second embodiment of the upper computer in fig. 1, in this embodiment, the upper computer 50 further includes a first determining module 53, where the first determining module 53 is configured to obtain slopes of two sets of data on two sides of a tin foil paper box inside an encapsulation paper box to be detected during transportation, and compare the obtained slopes with a preset slope threshold; if the obtained slope is larger than or equal to the slope threshold, judging that the two side edges of the paper box are not deformed; and if the obtained slope is smaller than the slope threshold, judging that the two side edges of the paper box deform.
Referring to fig. 5, fig. 5 is a functional block diagram of a third embodiment of the upper computer in fig. 1, in this embodiment, the upper computer 50 includes a sorting module 54, a selecting module 55, a fitting module 56, a second judging module 57, and a comparing and determining module 58, where the sorting module 54 is configured to combine the obtained relative position with a voltage value in an electrical signal to obtain a data point set, and sort the data point set in a small-to-large manner with the voltage value in the electrical signal as a reference; a selecting module 55, configured to select a data point set that is sorted and in which voltage values in the electrical signals belong to a set interval; the fitting module 56 is configured to fit the set of data points in the set interval by using a least square method to obtain a linear function; adding the voltage threshold value into the linear function to obtain a self-adaptive threshold value function; a second judging module 57, configured to judge whether there is carton surface data in the data set falling above the adaptive threshold function, and if so, judge that the carton surface is deformed; a comparison and judgment module 58, configured to extract two sets of data on two sides of the paper box in the data point set if the two sets of data are not in the data point set, calculate slopes of the two sets of data, compare the slopes with a slope threshold, and judge that two sides of the paper box are not deformed if the slopes are greater than or equal to the slope threshold; and if the slope is smaller than the slope threshold value, judging that the two side edges of the paper box deform.
As shown in fig. 6 and 7, fig. 6 is a functional block diagram of a second embodiment of the electrical eddy current nondestructive testing apparatus for tin foil paper boxes inside cartons, provided by the invention, based on the first embodiment, an electrical eddy current displacement sensor 30 includes a probe 31 and a pre-positioner 32, where the probe 31 is disposed on the mounting rack 20 and is used for measuring the relative position of a tin foil paper box inside an encapsulated carton to be tested and the end surface of the probe; and the front-end device 32 is electrically connected with the probe 31 and used for converting the relative position measured by the probe 31 into a corresponding electric signal to be output. Specifically, the pre-stage 32 includes an oscillator 321, a detection circuit 322, an amplification circuit 323, and a linearity compensation unit 324, the oscillator 321 for generating a sine wave; a detection circuit 322 electrically connected to the oscillator 321, for converting an ac signal into a dc signal; an amplifying circuit 323 electrically connected to the detection circuit 322 for amplifying the converted dc signal; and the linear compensation unit 324 is electrically connected with the amplifying circuit 323 and is used for compensating the measured relative position into a linear relation in the measuring range of the probe. In this embodiment, the oscillator 321 is used to improve the sensitivity and accuracy of the system measurement, and the oscillator 321 is a frequency source, generally used in a phase-locked loop, and is a device that can convert dc into ac without external signal excitation. In the nondestructive testing apparatus for electrical eddy current in a tin foil paper box shape provided in this embodiment, the image for detection is shown in fig. 7.
The transformer eddy current nondestructive testing device for the tin foil paper box inside the carton provided by the embodiment adopts a conveying mechanism, an installation rack, an eddy current displacement sensor, a data acquisition card and an upper computer, measures the relative position of the tin foil paper box inside the to-be-tested packaged carton and the end face of a probe in conveying through the eddy current displacement sensor, and converts the relative position into a corresponding electric signal to output; acquiring an electric signal converted by the eddy current displacement sensor by using a data acquisition card; and comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in an electric signal acquired by the data acquisition card by using an upper computer, and judging whether the surface of the paper box is deformed. According to the box-shaped power transformation eddy current nondestructive testing device for the tin foil paper in the paper box, the deformation of the tin foil paper box in the paper box is detected in a harmless nondestructive testing mode, and whether the front side and the rear side of the paper box entering a detection point are deformed or not is analyzed by adopting the angle of the slope, so that the detection precision and the accuracy are improved; compared with the quality control of manual sampling detection, the eddy current nondestructive carton deformation detection technology is based on the comprehensive investigation, and the quality control capability is greatly improved; compared with manual quality control, the eddy current detection nondestructive carton deformation detection technology realizes product quality control under the condition that products are not damaged, and reduces product detection loss cost.
As shown in fig. 8, fig. 8 is a schematic flow chart of a nondestructive testing method for transformer eddy current of a tin foil paper box inside a carton according to a first embodiment of the present invention, where the nondestructive testing method for transformer eddy current of a tin foil paper box inside a carton is applied to the nondestructive testing device for transformer eddy current of a tin foil paper box inside a carton, and includes the following steps:
and S100, measuring the relative position of the tin foil paper box inside the to-be-detected packaging paper box and the end face of the probe in conveying by adopting an eddy current displacement sensor, and converting the relative position into a corresponding electric signal to be output.
And S200, acquiring the electric signal converted by the eddy current displacement sensor by using a data acquisition card.
And S300, comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in an electric signal acquired by a data acquisition card through an upper computer, and judging whether the surface of the carton is deformed.
In the present embodiment, the voltage mapping table maps the correspondence between the relative position and the voltage threshold, and the voltage threshold in the voltage mapping table changes with the change of the relative position (paper cassette reference surface). The eddy current displacement sensor can statically and dynamically measure the distance between a measured metal conductor and a probe in a non-contact manner, high linearity and high resolution manner, and is a non-contact linear metering tool.
Referring to fig. 9, fig. 9 is a detailed flowchart of the first embodiment of step S300 in fig. 8, and step S300 includes:
and S310, acquiring the relative position of the tin foil paper box in the to-be-detected packaging paper box during conveying and the end face of the probe, finding a voltage threshold matched with the relative position in a voltage mapping table, and comparing the voltage threshold with a voltage value in an electric signal.
Step S320, if the voltage value is larger than the voltage threshold value, judging that the surface of the paper box deforms; and if the voltage value is less than or equal to the voltage threshold range, judging that the surface of the paper box is not deformed.
Referring to fig. 10, fig. 10 is a schematic diagram of a detailed flow of the second embodiment of step S300 in fig. 8, and after step S320, the method further includes:
s330, acquiring slopes of two groups of data on two sides of a tin foil paper box in the to-be-detected packaging paper box during conveying, and comparing the acquired slopes with a preset slope threshold value; if the obtained slope is larger than or equal to the slope threshold, judging that the two side edges of the paper box are not deformed; and if the obtained slope is smaller than the slope threshold, judging that the two side edges of the paper box deform.
As shown in fig. 11, fig. 11 is a schematic flow chart of a nondestructive testing method for electrical eddy current of a tin foil paper box inside a paper box according to a second embodiment of the present invention, in this embodiment, step S300 includes:
and step S340, combining the acquired relative position with the voltage value in the electric signal to obtain a data point set, and sequencing the data point set from small to large by taking the voltage value in the electric signal as a reference.
And step S350, selecting the sorted data point set of which the voltage values in the electric signals belong to the set interval.
S360, fitting a data point set in a set interval by using a least square method to obtain a linear function; and adding the voltage threshold value into the linear function to obtain an adaptive threshold value function.
And step S370, judging whether the surface data of the paper box in the data set falls above the adaptive threshold function, and if so, judging that the surface of the paper box is deformed.
Step S380, if not, extracting two groups of data on two sides of the paper box in the data point set, comparing the slope with a slope threshold value by calculating the slopes of the two groups of data, and if the slope is greater than or equal to the slope threshold value, judging that the two sides of the paper box are not deformed; and if the slope is smaller than the slope threshold value, judging that the two side edges of the paper box deform.
As shown in fig. 12, fig. 12 is a detailed flowchart of the third embodiment of step S300 in fig. 8, in this embodiment, the acquired relative position and the voltage value in the electrical signal are combined to obtain (t)i,ui) E.g. phi, and uiThe value will be (t) from small to largei,ui) Sorting; u is selectedi∈(umin,umin+ g) data (t)j,uj) E.g. D, fitting the data (t) using least squaresj,uj) E, obtaining u as b + at; adding the voltage threshold value c into the function u-b + at to obtain a self-adaptive threshold value function u-b + at + c; judging whether a data point (t) existsi,ui) E phi is positioned above the straight line u-b + at + c, so as to judge whether the surface of the paper box is deformed; extracting the first and last slaves uiTo ui+1Two groups of data with large value changes are calculated by calculating the slope k of the two groups of dataiComparing the slope kiAnd judging whether the two sides of the paper box deform or not according to the slope threshold value d.
Because the tinfoil paper detection planes in different cartons of the same model are slightly changed, the detection precision and accuracy of the cartons can be reduced by adopting an absolute fixed threshold mode, so that the self-adaptive threshold needs to adjust the threshold plane according to the position of the detection carton plane, and the distance of the detection carton plane relative to the threshold plane is ensured to be fixed. In addition, when the probe starts and finishes detecting the paper box, the acquired voltage signals are suddenly changed, the threshold method adopting the voltage is not applicable, and the sudden change of the voltage can be reduced after the side edge of the paper box is deformed, so that in the embodiment, whether the two sides of the paper box before and after entering the detection point are deformed or not is analyzed from the angle of the slope.
In the method for nondestructive testing of the box-shaped transformer eddy current of the tin foil paper in the carton, the relative position of the tin foil paper box to be tested in the conveying process and the end surface of the probe is measured by an eddy current displacement sensor, and the relative position is converted into a corresponding electric signal to be output; acquiring an electric signal converted by the eddy current displacement sensor by using a data acquisition card; and comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in an electric signal acquired by the data acquisition card by using an upper computer, and judging whether the surface of the paper box is deformed. According to the power transformation eddy current nondestructive testing method for the tin foil paper box in the paper box, deformation of the tin foil paper box in the paper box is detected in a harmless nondestructive testing mode, and whether deformation occurs on the front side and the rear side of the paper box entering a detection point or not is analyzed by adopting the angle of the slope, so that the detection precision and accuracy are improved; compared with the quality control of manual sampling detection, the eddy current nondestructive carton deformation detection technology is based on the comprehensive investigation, and the quality control capability is greatly improved; compared with manual quality control, the eddy current detection nondestructive carton deformation detection technology realizes product quality control under the condition that products are not damaged, and reduces product detection loss cost.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A tin foil paper box-shaped transformer eddy current nondestructive testing device in a paper box is characterized by comprising a conveying mechanism (10), an installation rack (20), an eddy current displacement sensor (30), a data acquisition card (40) and an upper computer (50),
the conveying mechanism (10) is used for conveying the packaging carton to be detected;
the mounting rack (20) is mounted on the conveying mechanism (10);
the eddy current displacement sensor (30) is arranged on the mounting rack (20) and is used for measuring the relative position of the tin foil paper box in the to-be-detected packaging paper box during conveying and the end face of the probe, and converting the relative position into a corresponding electric signal to be output;
the data acquisition card (40) is electrically connected with the eddy current displacement sensor (30) and is used for acquiring the electric signal converted by the eddy current displacement sensor (30);
the upper computer (50) is connected with the data acquisition card (40) and is used for comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in an electric signal acquired by the data acquisition card (40) and judging whether the surface of the paper box deforms or not;
mapping a corresponding relation between the relative position and the voltage threshold value in the voltage mapping table;
the upper computer (50) comprises a comparison module (51) and a judgment module (52),
the comparison module (51) is used for acquiring the relative position between the tin foil paper box in the to-be-detected packaging paper box during conveying and the end face of the probe, finding a voltage threshold matched with the relative position in the voltage mapping table, and comparing the voltage threshold with a voltage value in the electric signal;
the determination module (52) is used for determining that the surface of the paper box deforms if the voltage value is larger than the voltage threshold value; if the voltage value is smaller than or equal to the voltage threshold range, determining that the surface of the paper box is not deformed;
the upper computer (50) also comprises a first judgment module (53),
the first judgment module (53) is used for acquiring slopes of two groups of data on two sides of a tin foil paper box in the to-be-detected packaging paper box during conveying and comparing the acquired slopes with a preset slope threshold; if the obtained slope is larger than or equal to the slope threshold, judging that the two side edges of the carton are not deformed; and if the obtained slope is smaller than the slope threshold, judging that the two side edges of the paper box deform.
2. The box-shaped electrical eddy current nondestructive testing device for tinfoil paper inside a carton according to claim 1,
the upper computer (50) comprises a sorting module (54), a selecting module (55), a fitting module (56), a second judging module (57) and a comparing and judging module (58),
the sorting module (54) is used for combining the acquired relative position with the voltage value in the electric signal to obtain a data point set, and sorting the data point set from small to large by taking the voltage value in the electric signal as a reference;
the selecting module (55) is used for selecting the sorted data point set of which the voltage values in the electric signals belong to a set interval;
the fitting module (56) is used for fitting the data point set in the set interval by using a least square method to obtain a linear function; adding the voltage threshold value into the linear function to obtain an adaptive threshold value function;
the second judging module (57) is used for judging whether the surface data of the paper box in the data set falls above the adaptive threshold function, and if so, judging that the surface of the paper box deforms;
the comparison and judgment module (58) is used for extracting two groups of data of two sides of the paper box in the data point set if the data points are not in the data point set, comparing the slope with the slope threshold value by calculating the slopes of the two groups of data, and judging that the two sides of the paper box are not deformed if the slope is greater than or equal to the slope threshold value; and if the slope is smaller than the slope threshold value, judging that the two side edges of the paper box deform.
3. The box-shaped electrical eddy current nondestructive testing device for tinfoil paper inside a carton according to claim 1,
the eddy current displacement sensor (30) comprises a probe (31) and a front-end device (32),
the probe (31) is arranged on the mounting rack (20) and used for measuring the relative position of the tin foil paper box in the to-be-detected packaging paper box during conveying and the end face of the probe;
the front-end device (32) is electrically connected with the probe (31) and used for converting the relative position measured by the probe (31) into a corresponding electric signal for outputting.
4. The box-shaped electrical eddy current nondestructive testing device for tinfoil paper inside a carton according to claim 3,
the pre-processor (32) comprises an oscillator (321), a detection circuit (322), an amplification circuit (323) and a linear compensation unit (324),
the oscillator (321) is electrically connected with the probe (31) and used for generating sine waves;
the detection circuit (322) is electrically connected with the oscillator (321) and is used for converting an alternating current signal into a direct current signal;
the amplifying circuit (323) is electrically connected with the detection circuit (322) and is used for amplifying the direct current signal converted by the detection circuit (322);
the linear compensation unit (324) is respectively electrically connected with the oscillator (321) and the amplifying circuit (323) and is used for compensating the measured relative position into a linear relation in the measuring range of the probe (31).
5. The nondestructive testing method for the box-shaped variable eddy current in the tin foil paper in the carton is applied to the nondestructive testing device for the box-shaped variable eddy current in the tin foil paper in the carton according to any one of claims 1 to 4, and is characterized by comprising the following steps of:
measuring the relative position of a tin foil paper box in the to-be-detected packaging paper box and the end face of a probe in conveying by using an eddy current displacement sensor, and converting the relative position into a corresponding electric signal to output;
acquiring the electric signal converted by the eddy current displacement sensor by using a data acquisition card;
and comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in an electric signal acquired by a data acquisition card through an upper computer, and judging whether the surface of the paper box is deformed.
6. The method for nondestructive testing of box-shaped electrical eddy current of tin-foil paper in the carton according to claim 5,
the step of comparing a voltage threshold value in a preset voltage mapping table with a voltage numerical value in an electric signal collected by a data acquisition card through an upper computer and judging whether the surface of the paper box is deformed comprises the following steps:
acquiring the relative position of a tin foil paper box in the to-be-detected packaging paper box during conveying and the end face of a probe, finding a voltage threshold matched with the relative position in the voltage mapping table, and comparing the voltage threshold with a voltage value in the electric signal;
if the voltage value is larger than the voltage threshold value, judging that the surface of the paper box deforms; and if the voltage value is smaller than or equal to the voltage threshold range, judging that the surface of the paper box is not deformed.
7. The method for nondestructive testing of box-shaped electrical eddy current of tin-foil paper in the carton according to claim 5,
if the voltage value is larger than the voltage threshold value, judging that the surface of the paper box deforms; if the voltage value is less than or equal to the voltage threshold range, the step of determining that the surface of the paper box is not deformed further comprises the following steps:
acquiring slopes of two groups of data on two sides of a tin foil paper box in a to-be-detected packaging paper box during conveying, and comparing the acquired slopes with a preset slope threshold; if the obtained slope is larger than or equal to the slope threshold, judging that the two side edges of the carton are not deformed; and if the obtained slope is smaller than the slope threshold, judging that the two side edges of the paper box deform.
8. The method for nondestructive testing of box-shaped electrical eddy current of tin-foil paper in the carton according to claim 7,
combining the obtained relative position with the voltage value in the electric signal to obtain a data point set, and sequencing the data point set from small to large by taking the voltage value in the electric signal as a reference;
selecting a data point set which is sequenced and the voltage value in the electric signal belongs to a set interval;
fitting the data point set in the set interval by using a least square method to obtain a linear function; adding the voltage threshold value into the linear function to obtain an adaptive threshold value function;
judging whether the surface data of the paper box in the data set falls above the self-adaptive threshold function or not, and if so, judging that the surface of the paper box deforms;
if not, extracting two groups of data on two sides of the paper box in the data point set, calculating the slopes of the two groups of data, comparing the slopes with the slope threshold, and if the slopes are larger than or equal to the slope threshold, judging that the two sides of the paper box are not deformed; and if the slope is smaller than the slope threshold value, judging that the two side edges of the paper box deform.
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