Thickness detection method and system for electrical shielding box

Abstract

The invention relates to the technical field of intelligent detection, in particular to a thickness detection method and system for an electrical shielding box, and the method comprises the steps: driving an upper detection surface and a lower detection surface which are oppositely arranged to move to the electrical shielding box at a first speed to a preset distance; continuously moving towards the electrical shielding box at a second speed until any group of vertically corresponding detection points reach a pressure threshold value, and synchronously acquiring instantaneous displacement data of all the detection points at a triggering moment; according to the instantaneous displacement data, calculating a position deviation value of each group of upper and lower corresponding detection points in a horizontal plane, and screening out a detection point group of which the position deviation value is within an allowable deviation value range as an effective detection point pair; and calculating a local thickness value of each effective detection point pair based on the instantaneous displacement data of each effective detection point pair, and obtaining a thickness detection result. According to the invention, the problem that the existing single-point detection cannot reflect the overall thickness distribution of the electrical shielding box is effectively solved, multi-point synchronous measurement is realized, and the comprehensiveness and reliability of a detection result are improved.

Description

Technical Field

[0001] This invention relates to the field of intelligent detection technology, and in particular to a method and system for detecting the thickness of an electrical shielding box. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the number of on-board electronic control systems is constantly increasing. Electrical shielding boxes, as core structural components, are widely used in power battery management, drive motor control, and high-voltage power distribution to achieve electromagnetic shielding and structural protection. Since electrical shielding boxes are typically made of metal, their thickness accuracy directly affects the shielding effect and structural strength; therefore, thickness testing is required during the production process.

[0003] The single-point contact measurement method commonly used in the existing technology has the problem of limited detection range and inability to effectively reflect the overall thickness distribution, resulting in insufficient grasp of local thickness differences, which makes it difficult to meet the requirements of comprehensive and reliable detection in the large-scale production of electrical shielding boxes for new energy vehicles. Summary of the Invention

[0004] This invention provides a method and system for detecting the thickness of an electrical shielding box, thereby effectively solving the problems pointed out in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for detecting the thickness of an electrical shielding box, comprising: The upper and lower detection surfaces, which are arranged opposite each other, move toward the electrical shielding box at a first speed to a preset distance. The upper and lower detection surfaces are provided with multiple detection points that correspond one-to-one in spatial position. Continue moving toward the electrical shielding box at a second speed until any pair of corresponding detection points reach the pressure threshold, and simultaneously acquire the instantaneous displacement data of all detection points at the trigger moment, wherein the second speed is less than the first speed; Based on the instantaneous displacement data, calculate the positional deviation values ​​of the corresponding detection points in each group in the horizontal plane, and select the detection point groups whose positional deviations are within the allowable deviation range as valid detection point pairs. Based on the instantaneous displacement data of each effective detection point pair, the local thickness value of each effective detection point pair is calculated, and the thickness detection result is obtained.

[0006] Furthermore, if any of the aforementioned detection points exceeds the allowable deviation range, the electrical shielding box is determined to be a defective product.

[0007] Furthermore, the method also includes: Obtain displacement data under different contact pressures to obtain the correspondence between contact pressure and material compression. Based on the corresponding relationship and ambient temperature conditions, the material elastic compression compensation amount is determined when the pressure threshold is triggered. The material elastic compression compensation amount is used to supplement and correct the thickness calculation.

[0008] Further, based on the instantaneous displacement data, the positional deviation values ​​of the corresponding upper and lower detection points in the horizontal plane are calculated, including: Establish a horizontal coordinate system based on the clamping reference, and determine the horizontal position coordinates of the corresponding upper and lower detection points of each group respectively; Based on the horizontal position coordinates, calculate the horizontal coordinate difference between the corresponding monitoring points above and below each group; Based on the coordinate difference, the positional deviation value representing the horizontal alignment offset is generated.

[0009] Furthermore, a horizontal coordinate system is established based on the clamping datum, including: The clamping reference plane of the electrical shielding box is used as the physical positioning surface of the three-dimensional spatial coordinate system; A point is selected on the clamping reference plane and defined as the origin of the three-dimensional spatial coordinate system. An orthogonal triaxial system is then constructed based on the origin. Project the corresponding detection points of each group onto the horizontal coordinate system and generate a unique horizontal position coordinate for each detection point.

[0010] Furthermore, at the trigger moment, the instantaneous displacement data of all detection points are acquired synchronously, including: When any set of detection points triggers the pressure threshold, a synchronous acquisition command signal is immediately generated and sent to all detection points, so that each detection point freezes its current position data simultaneously under the same physical time reference. The acquisition time of each displacement data point is marked, and the displacement dataset with acquisition time marks is spatiotemporally aligned.

[0011] Further, based on the instantaneous displacement data of each effective detection point pair, the local thickness value of each effective detection point pair is calculated, and the thickness detection result is obtained, including: Based on the contact pressure value and material elastic parameters at the effective detection points when the pressure threshold is reached, the elastic compression compensation amount of the corresponding measurement group is dynamically calculated. Subtract the elastic compression compensation amount from the spatial position difference of the same group of detection points to obtain the unit thickness value of each effective detection point pair; The thickness detection result is generated based on the unit thickness value of each effective detection point pair.

[0012] Further, based on the unit thickness values ​​of each of the effective detection point pairs, the thickness detection result is generated, including: Statistical analysis was performed on the thickness values ​​of each unit to extract the overall distribution pattern; Based on the overall distribution pattern, detection point pairs that do not conform to the distribution pattern are identified; The detection point pairs are identified as abnormal detection groups and removed, while the remaining valid detection data are used to generate the thickness detection result.

[0013] A thickness detection system for an electrical shielding box, the system comprising: The first speed drive module drives the relatively set upper and lower detection surfaces to move towards the electrical shielding box at a first speed to a preset distance. The upper and lower detection surfaces are provided with multiple detection points with one-to-one spatial positions. The displacement data acquisition module continues to move toward the electrical shielding box at a second speed until any pair of corresponding detection points reach the pressure threshold, and synchronously acquires the instantaneous displacement data of all detection points at the trigger moment. The second speed is less than the first speed. The effective measurement group screening module calculates the position deviation value of the corresponding detection points in the horizontal plane of each group based on the instantaneous displacement data, and selects the detection point group whose position deviation is within the allowable deviation value range as the effective measurement group. The detection result calculation module calculates the local thickness value of each effective measurement group based on the instantaneous displacement data of each effective measurement group, and obtains the thickness detection result.

[0014] Furthermore, the detection result calculation module includes: The compensation calculation unit dynamically calculates the elastic compression compensation amount of the corresponding measurement group based on the contact pressure value and material elastic parameters when the effective detection point reaches the pressure threshold. The unit thickness acquisition unit subtracts the elastic compression compensation amount from the spatial position difference of the same group of detection points to obtain the unit thickness value of each effective detection point pair; The thickness result generation unit generates the thickness detection result based on the unit thickness value of each effective detection point pair.

[0015] The technical solution of this invention can achieve the following technical effects: It effectively solves the problem that existing single-point testing cannot reflect the overall thickness distribution of electrical shielding boxes, and realizes multi-point synchronous measurement, improving the comprehensiveness and reliability of test results. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating a method for detecting the thickness of an electrical shielding box. Figure 2 This is a schematic diagram of an optimized process for measuring the thickness of an electrical shielding box. Figure 3 A flowchart illustrating the process of calculating the positional deviation of corresponding detection points in the horizontal plane for each group; Figure 4 A flowchart illustrating the process of establishing a horizontal coordinate system based on the clamping reference. Figure 5 To synchronously acquire instantaneous displacement data of all detection points at the trigger moment Figure 6 A flowchart illustrating the process for calculating the local thickness value of each effective detection point pair; Figure 7 This is a flowchart illustrating the process of generating thickness detection results based on the unit thickness values ​​of each effective detection point pair. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] Example 1 like Figure 1 As shown, the present invention provides a method for detecting the thickness of an electrical shielding box, the method comprising: S1: Drive the upper and lower detection surfaces that are set relative to each other to move towards the electrical shielding box at a first speed to a preset distance. The upper and lower detection surfaces are set with multiple detection points that correspond one-to-one in spatial position. Specifically, the thickness detection device consists of an upper detection surface and a lower detection surface arranged opposite to each other. These surfaces move precisely relative to each other via a servo motor-driven lead screw mechanism. At the start of the detection phase, the control system drives the upper and lower detection surfaces to move towards the electrical shielding box at a first speed until a preset distance is reached between them and the outer surface of the workpiece being measured. The first speed is preferably set to a relatively high speed to ensure smooth movement while quickly completing the approach action, thus shortening the detection preparation time. The preset distance can be set according to the specific dimensions of the shielding box, typically ranging from a few millimeters to provide buffer space during the subsequent low-speed contact phase, preventing direct impact on the shielding box surface. To ensure the comprehensiveness and accuracy of the thickness detection, multiple detection points are arranged on both the upper and lower detection surfaces. These detection points are spatially corresponding one-to-one, and the spacing between them is determined according to the measurement accuracy requirements. Each detection point integrates a high-precision displacement sensor and a miniature pressure sensor. This arrangement allows the detection device to simultaneously acquire data from multiple detection areas over a large area, avoiding representativeness bias caused by insufficient detection point coverage.

[0021] S2: Continue moving toward the electrical shielding box at the second speed until any set of corresponding upper and lower detection points reach the pressure threshold, and simultaneously acquire the instantaneous displacement data of all detection points at the trigger moment. The second speed is less than the first speed. Specifically, when the upper and lower detection surfaces approach the electrical shielding box at a first speed and reach a preset distance, the control system switches the movement speed to a second speed, continuing to drive the detection surfaces to slowly move towards the tested component. The second speed should be significantly lower than the first speed, for example, it can be controlled within one-tenth to one-twentieth of the first speed, to ensure that the contact process between the detection point and the surface of the shielding box is smooth and controllable, avoiding impact deformation due to excessively rapid contact. During the slow contact process, each set of corresponding upper and lower detection points continuously monitors its own force changes. When the force signal of any set of detection points reaches the preset pressure threshold, a synchronous acquisition command is immediately triggered. At this time, all detection points simultaneously freeze their current position data at the same physical moment, forming a complete instantaneous displacement dataset. Instantaneous displacement data refers to the displacement between each detection point and its initial reference position at the trigger moment. It reflects the spatial state of different parts of the electrical shielding box at the moment of pressure. Since all detection point data are collected under the same time reference, the comparability of the data between each detection point can be guaranteed, which provides a unified data basis for subsequent position deviation analysis and thickness calculation.

[0022] S3: Based on the instantaneous displacement data, calculate the positional deviation of each group of corresponding detection points in the horizontal plane, and select the detection point groups whose positional deviation is within the allowable deviation range as valid detection point pairs; Specifically, after the instantaneous displacement data is acquired, the processing stage compares the corresponding upper and lower detection points in each group. Based on the displacement difference between the two points in the horizontal plane, a positional deviation value is determined. The positional deviation value refers to the relative difference between the upper and lower detection points in the horizontal projection direction at the trigger moment. It reflects whether the detection point group has maintained a reasonable alignment relationship during the detection process. The smaller the deviation value, the closer the upper and lower detection points are to the ideal alignment state in the horizontal position. If the deviation value is too large, it indicates that the detection point group has an alignment deviation or is affected by external factors. Next, the deviation value of each group of detection points is compared with the allowable range. If the deviation value is within the allowable range, the detection point group is selected as a valid detection point pair. If the deviation value exceeds the allowable range, the detection point group is discarded and does not participate in the subsequent thickness calculation. Through this screening mechanism, data anomalies caused by unstable clamping, local unevenness of the shell, or fixed errors of the detection points can be avoided, thereby ensuring that the data entering the next step of thickness calculation is more stable and reliable.

[0023] S4: Based on the instantaneous displacement data of each effective detection point pair, calculate the local thickness value of each effective detection point pair and obtain the thickness detection result.

[0024] Specifically, once the effective detection point pairs are selected and determined, the processing stage directly uses the instantaneous displacement data recorded by these point pairs at the trigger moment to calculate the corresponding local thickness value. The local thickness value refers to the actual thickness of the shielding box in the local area obtained by comparing the displacement data between the corresponding detection points above and below. After calculating each local thickness value, all local thickness values ​​are combined to form the thickness detection result. This result can reflect the thickness of the electrical shielding box in multiple areas, thus providing a basis for overall thickness assessment.

[0025] This invention effectively solves the problem that existing single-point detection cannot reflect the overall thickness distribution of electrical shielding boxes, and realizes multi-point synchronous measurement, thereby improving the comprehensiveness and reliability of the detection results.

[0026] As a preferred embodiment of the above, if any detection point exceeds the allowable deviation range, the electrical shielding box is determined to be a defective product.

[0027] Specifically, if any set of corresponding test points is found to have a deviation value exceeding the preset allowable range during the test, it indicates that there is a significant inconsistency in the horizontal alignment of the test point set. This situation often means that the electrical shielding box has deformation or structural deviation in a local area. In order to ensure the reliability of the test results, this situation should be directly judged as the entire electrical shielding box being unqualified, without having to proceed to the subsequent thickness calculation step.

[0028] As a preferred embodiment of the above, such as Figure 2 As shown, the method also includes: A10: Obtain displacement data under different contact pressures to obtain the correspondence between contact pressure and material compression. A20: Based on the corresponding relationship and ambient temperature conditions, determine the material elastic compression compensation amount under the trigger pressure threshold. The material elastic compression compensation amount is used to supplement and correct the thickness calculation.

[0029] Specifically, firstly, displacement data of the electrical shielding box material under different contact pressures is collected to obtain the correspondence between contact pressure and material compression. In this embodiment, it is preferable to apply progressively increasing pressure on the test bench and record the small deformation of the material at each pressure level to form a pressure-compression mapping curve. This curve can intuitively reflect the compression characteristics of the material within its elastic range. During the testing process, when the test point triggers the pressure threshold, the elastic compression compensation amount of the material under that pressure can be calculated based on the above correspondence and the current ambient temperature conditions. In this embodiment, the influence of temperature on the elastic modulus of metallic materials is preferably considered, and the compression compensation amount is appropriately corrected when the ambient temperature is high to avoid thickness calculation deviations caused by temperature fluctuations. Subsequently, this elastic compression compensation amount is introduced into the thickness calculation stage to supplement and correct local thickness values, making the final test result closer to the true thickness of the tested part.

[0030] As a preferred embodiment of the above, such as Figure 3 As shown, based on the instantaneous displacement data, the positional deviation values ​​of the corresponding detection points above and below in the horizontal plane are calculated, including: B10: Establish a horizontal coordinate system based on the clamping reference, and determine the horizontal position coordinates of the corresponding detection points in each group. B20: Based on the horizontal position coordinates, calculate the horizontal coordinate difference between the corresponding monitoring points above and below each group; B30: Generates positional deviation values ​​representing horizontal alignment offset based on coordinate differences.

[0031] Specifically, a horizontal coordinate system is established with the clamping datum as a reference, and the horizontal position coordinates of each set of corresponding upper and lower detection points in this coordinate system are determined. A preferred method is to fix the clamping datum plane of the shielding box as the zero reference plane during the installation of the detection device, and use a specific point on this plane as the origin of the coordinate system to obtain the horizontal position parameters of each detection point. This ensures that different detection points are compared under the same datum, avoiding errors introduced by different clamping positions. Based on the obtained horizontal position coordinates, the coordinate difference between the upper and lower detection points in the horizontal direction is calculated for each set. This difference represents the projected distance between the upper and lower points in the horizontal direction, directly reflecting whether the point pair maintains a reasonable alignment relationship. Based on the above coordinate difference, a position deviation value representing the horizontal alignment offset is generated. The smaller the position deviation value, the closer the upper and lower detection points are to the ideal alignment state in the horizontal direction. If the position deviation value is large, it indicates that the point pair may be affected by clamping errors or local deformation of the workpiece. Finally, these deviation values ​​are used as an important basis for screening effective detection point pairs.

[0032] As a preferred embodiment of the above, such as Figure 4 As shown, a horizontal coordinate system is established based on the clamping datum, including: C10: Use the clamping reference plane of the electrical shielding box as the physical positioning surface of the three-dimensional spatial coordinate system; C20: Select a point on the clamping reference plane, define it as the origin of the three-dimensional space coordinate system, and construct an orthogonal triaxial system based on the origin. C30: Project the corresponding detection points of each group onto the horizontal coordinate system and generate a unique horizontal position coordinate for each detection point.

[0033] Specifically, firstly, the clamping reference plane of the electrical shielding box is used as the spatial positioning surface. This reference plane is used to define the reference position of the three-dimensional spatial coordinate system, thereby ensuring that each workpiece being measured can obtain a consistent spatial reference during clamping. Subsequently, a stable and easily repeatable fixed point is selected on the reference plane as the origin of the coordinate system, and three mutually orthogonal coordinate axes are established from this point to form a complete three-dimensional spatial coordinate system. Preferably, the horizontal coordinate axis can be parallel to the horizontal and vertical guide rails of the detection device, while the vertical coordinate axis maintains a normal relationship with the clamping plane. This ensures that the subsequent position data is consistent with the movement direction of the detection equipment. After the coordinate system is established, the corresponding detection points are positioned in the horizontal coordinate system through projection mapping. Furthermore, a unique horizontal position coordinate is generated for each detection point. In this way, the relative positions of different detection points can be represented and calculated under a unified mathematical framework, avoiding inaccurate position comparisons caused by workpiece clamping errors or uneven installation of detection points.

[0034] As a preferred embodiment of the above, such as Figure 5As shown, instantaneous displacement data of all detection points are acquired synchronously at the trigger moment, including: D10: When any set of detection points triggers the pressure threshold, a synchronous acquisition command signal is immediately generated and sent to all detection points, so that each detection point freezes its current position data simultaneously under the same physical time reference. D20: Mark the acquisition time of each displacement data point and perform spatiotemporal alignment on the displacement dataset with the acquisition time mark.

[0035] Specifically, to ensure that data from all detection points can be accurately recorded under a unified time reference, when any set of upper and lower detection points reaches a preset pressure threshold, the control unit immediately generates a synchronous acquisition command signal and distributes it to all detection points simultaneously. Upon receiving the command, each detection point freezes its current position data, ensuring that the data collected by different detection points completely correspond to the same physical moment. Preferably, the synchronous acquisition command can be implemented through a hardware trigger circuit to avoid time differences caused by software delays, thereby achieving acquisition accuracy at the microsecond level. To further improve data availability, each displacement data point is marked with the acquisition time during recording. These marks are used for spatiotemporal alignment in subsequent processing, enabling data from different detection points to be combined and analyzed according to a unified time sequence. In this way, even if some detection points have not yet reached the pressure threshold when triggered, their displacement state can still be acquired and saved simultaneously, thus ensuring the completeness and consistency of the final dataset. For example, when testing the aluminum alloy shielding box used in the battery management system of new energy vehicles, when the detection points at the edges and corners reach the threshold first to trigger the acquisition, the displacement information of the detection points in the central area, even though they have not yet fully contacted the surface of the shielding box, will still be recorded synchronously. This allows subsequent thickness calculations to be performed based on a globally consistent dataset, significantly improving the accuracy and reliability of the results.

[0036] As a preferred embodiment of the above, such as Figure 6 As shown, in step S4, based on the instantaneous displacement data of each effective detection point pair, the local thickness value of each effective detection point pair is calculated, and the thickness detection result is obtained, including: S41: Based on the contact pressure value and material elastic parameters at the effective detection points when the pressure threshold is reached, dynamically calculate the elastic compression compensation amount of the corresponding measurement group. S42: Subtract the elastic compression compensation amount from the spatial position difference of the same group of detection points to obtain the unit thickness value of each effective detection point pair; S43: Generate thickness detection results based on the unit thickness values ​​of each effective detection point pair.

[0037] Specifically, when a valid detection point pair reaches the pressure threshold, the elastic compression compensation amount of the point pair under the stress condition is dynamically calculated based on the contact pressure value and the elastic parameters of the material. This compensation amount reflects the reversible deformation of the material under external force and is the main factor causing the deviation between the measured data and the actual thickness. Subsequently, the corresponding elastic compression compensation amount is subtracted from the spatial position difference of the same group of detection points to obtain the unit thickness value of the point pair. The reason for this subtraction is that the detection point applies pressure to the material surface during the contact process, and the material will be slightly compressed. If the spatial position difference is directly used as the thickness result, the value will be less than the actual thickness. By introducing the compensation amount for correction, this systematic error caused by the elastic deformation of the material can be effectively eliminated. Finally, based on the unit thickness values ​​of multiple valid detection point pairs, the data is integrated to generate the thickness detection result of the electrical shielding box.

[0038] As a preferred embodiment of the above, such as Figure 7 As shown, step S43 generates a thickness detection result based on the unit thickness value of each valid detection point pair, including: S431: Perform statistical analysis on the thickness values ​​of each unit to extract the overall distribution pattern; S432: Based on the overall distribution pattern, identify detection point pairs that do not conform to the distribution pattern; S433: Identify the detection point pairs as abnormal detection groups and remove them, retaining the remaining valid detection data to generate thickness detection results.

[0039] Specifically, the unit thickness values ​​of all valid detection point pairs are first processed and statistically analyzed to extract the overall distribution pattern. During this process, statistical measures such as the mean, range, and standard deviation are calculated, and combined with the frequency distribution of thickness values, an overall thickness distribution model is formed. Ideally, distribution curves or box plots can be used to visually present the central tendency and dispersion of the data, thus providing a quantitative basis for subsequent anomaly identification. After obtaining the overall distribution pattern, each unit thickness value is compared with this pattern one by one. If the thickness values ​​of some detection point pairs deviate significantly from the overall trend, i.e., they are not consistent with the overall distribution pattern, the analysis is performed. If significant differences exist in most concentrated areas of the dataset, it can be determined that the data for that pair of points does not conform to the overall pattern. Ideally, this can be achieved by setting statistical intervals. This method balances sensitivity and robustness, promptly identifying anomalies while avoiding excessive removal of normal data. After identifying anomalies, the corresponding detection point pairs are classified as anomaly detection groups and removed from the dataset. The average thickness value is recalculated for the retained dataset as a representative value for the overall thickness of the electrical shielding box. Next, the thickness distribution range is determined based on the maximum and minimum values. Finally, the standard deviation or coefficient of variation is calculated to evaluate the consistency of the thickness. In this way, the final thickness detection result contains both a representative thickness value and reflects the overall distribution characteristics and uniformity of the thickness.

[0040] Example 2 Based on the same inventive concept as the thickness detection method for an electrical shielding box in the foregoing embodiments, the present invention also provides a thickness detection system for an electrical shielding box, the system comprising: The first speed drive module drives the relatively set upper and lower detection surfaces to move towards the electrical shielding box at a first speed to a preset distance. The upper and lower detection surfaces are set with multiple detection points that correspond one-to-one in spatial position. The displacement data acquisition module continues to move toward the electrical shielding box at a second speed until any set of corresponding upper and lower detection points reach the pressure threshold, and synchronously acquires the instantaneous displacement data of all detection points at the trigger moment. The second speed is less than the first speed. The effective measurement group screening module calculates the positional deviation of the corresponding detection points in the horizontal plane for each group based on instantaneous displacement data, and selects the detection point groups whose positional deviation is within the allowable deviation range as effective measurement groups. The detection result calculation module calculates the local thickness value of each effective measurement group based on the instantaneous displacement data of each effective measurement group, and obtains the thickness detection result.

[0041] The detection system described above in this invention can effectively realize the thickness detection method of electrical shielding boxes, and the technical effects it can achieve are as described in the above embodiments, which will not be repeated here.

[0042] As a preferred embodiment of the above, the detection result calculation module includes: The compensation calculation unit dynamically calculates the elastic compression compensation amount of the corresponding measurement group based on the contact pressure value and material elastic parameters when the effective detection point reaches the pressure threshold. The unit thickness acquisition unit subtracts the elastic compression compensation amount from the spatial position difference of the same group of detection points to obtain the unit thickness value of each effective detection point pair; The thickness result generation unit generates thickness detection results based on the unit thickness values ​​of each effective detection point pair.

[0043] Similarly, the above-mentioned optimization schemes for the system can also achieve the optimization effects corresponding to the methods in Embodiment 1, which will not be repeated here.

[0044] Although this application has been described in conjunction with specific features and embodiments, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of this application. Therefore, if such modifications and variations fall within the scope of this application and its equivalents, this application intends to include such modifications and variations.

Claims

1. A method for detecting the thickness of an electrical shielding box, characterized in that, include: The upper and lower detection surfaces, which are arranged opposite each other, move toward the electrical shielding box at a first speed to a preset distance. The upper and lower detection surfaces are provided with multiple detection points that correspond one-to-one in spatial position. Continue moving toward the electrical shielding box at a second speed until any pair of corresponding detection points reach the pressure threshold, and simultaneously acquire the instantaneous displacement data of all detection points at the trigger moment, wherein the second speed is less than the first speed; Based on the instantaneous displacement data, calculate the positional deviation values ​​of the corresponding detection points in each group in the horizontal plane, and select the detection point groups whose positional deviations are within the allowable deviation range as valid detection point pairs. Based on the instantaneous displacement data of each effective detection point pair, the local thickness value of each effective detection point pair is calculated, and the thickness detection result is obtained.

2. The thickness detection method for an electrical shielding box according to claim 1, characterized in that, If any of the test points exceeds the allowable deviation range, the electrical shielding box is determined to be a defective product.

3. The method for detecting the thickness of an electrical shielding box according to claim 1, characterized in that, The method further includes: Obtain displacement data under different contact pressures to obtain the correspondence between contact pressure and material compression. Based on the corresponding relationship and ambient temperature conditions, the material elastic compression compensation amount is determined when the pressure threshold is triggered. The material elastic compression compensation amount is used to supplement and correct the thickness calculation.

4. The thickness detection method for an electrical shielding box according to claim 1, characterized in that, Based on the instantaneous displacement data, calculate the positional deviation values ​​of the corresponding upper and lower detection points in the horizontal plane, including: Establish a horizontal coordinate system based on the clamping reference, and determine the horizontal position coordinates of the corresponding upper and lower detection points of each group respectively; Based on the horizontal position coordinates, calculate the horizontal coordinate difference between the corresponding upper and lower monitoring points in each group; Based on the coordinate difference, the positional deviation value representing the horizontal alignment offset is generated.

5. The thickness detection method for an electrical shielding box according to claim 4, characterized in that, Establishing a horizontal coordinate system based on the clamping datum includes: The clamping reference plane of the electrical shielding box is used as the physical positioning surface of the three-dimensional spatial coordinate system; A point is selected on the clamping reference plane and defined as the origin of the three-dimensional spatial coordinate system. An orthogonal triaxial system is then constructed based on the origin. Project the corresponding detection points of each group onto the horizontal coordinate system and generate a unique horizontal position coordinate for each detection point.

6. The method for detecting the thickness of an electrical shielding box according to claim 1, characterized in that, At the trigger moment, the instantaneous displacement data of all detection points are acquired synchronously, including: When any set of detection points triggers the pressure threshold, a synchronous acquisition command signal is immediately generated and sent to all detection points, so that each detection point freezes its current position data simultaneously under the same physical time reference. The acquisition time of each displacement data point is marked, and the displacement dataset with acquisition time marks is spatiotemporally aligned.

7. The method for detecting the thickness of an electrical shielding box according to claim 1, characterized in that, Based on the instantaneous displacement data of each effective detection point pair, the local thickness value of each effective detection point pair is calculated, and the thickness detection result is obtained, including: Based on the contact pressure value and material elastic parameters at the effective detection points when the pressure threshold is reached, the elastic compression compensation amount of the corresponding measurement group is dynamically calculated. Subtract the elastic compression compensation amount from the spatial position difference of the same group of detection points to obtain the unit thickness value of each effective detection point pair; The thickness detection result is generated based on the unit thickness value of each effective detection point pair.

8. The method for detecting the thickness of an electrical shielding box according to claim 7, characterized in that, Based on the unit thickness value of each of the effective detection point pairs, the thickness detection result is generated, including: Statistical analysis was performed on the thickness values ​​of each unit to extract the overall distribution pattern; Based on the overall distribution pattern, detection point pairs that do not conform to the distribution pattern are identified; The detection point pairs are identified as abnormal detection groups and removed, while the remaining valid detection data are used to generate the thickness detection result.

9. A thickness detection system for an electrical shielding box, characterized in that, The system includes: The first speed drive module drives the relatively set upper and lower detection surfaces to move towards the electrical shielding box at a first speed to a preset distance. The upper and lower detection surfaces are provided with multiple detection points with one-to-one spatial positions. The displacement data acquisition module continues to move toward the electrical shielding box at a second speed until any pair of corresponding detection points reach the pressure threshold, and synchronously acquires the instantaneous displacement data of all detection points at the trigger moment. The second speed is less than the first speed. The effective measurement group screening module calculates the position deviation value of the corresponding detection points in the horizontal plane of each group based on the instantaneous displacement data, and selects the detection point group whose position deviation is within the allowable deviation value range as the effective measurement group. The detection result calculation module calculates the local thickness value of each effective measurement group based on the instantaneous displacement data of each effective measurement group, and obtains the thickness detection result.

10. The thickness detection system for an electrical shielding box according to claim 9, characterized in that, The detection result calculation module includes: The compensation calculation unit dynamically calculates the elastic compression compensation amount of the corresponding measurement group based on the contact pressure value and material elastic parameters when the effective detection point reaches the pressure threshold. The unit thickness acquisition unit subtracts the elastic compression compensation amount from the spatial position difference of the detection points in the same group to obtain the unit thickness value of each effective detection point pair; The thickness result generation unit generates the thickness detection result based on the unit thickness value of each effective detection point pair.

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