Surface density full-inspection detection mechanism

Abstract

The utility model relates to the technical field of surface density detection, in particular to a surface density full-inspection detection mechanism, which comprises a plurality of groups of detection units distributed along the belt running direction of a detection material, and each group of detection units are arranged on the same straight line along the breadth direction of the detection material. Every two adjacent detection units in the breadth direction of a detection material are located on different straight lines respectively, the effective detection width of the multiple detection units covers the breadth of the detection material, the adjacent detection units are spliced, surface density full detection of any wide material can be achieved, meanwhile, every two adjacent detection units are not located on the same straight line, and the detection efficiency is improved. According to the method, the influence of ray crossing on the accuracy of surface density contour detection can be avoided, the ray fan beam angle of a single detection unit is small, large-angle oblique incidence is avoided, the radiation quantity difference of different positions on the long-strip-shaped light spots is small, and the whole breadth surface density detection effect is consistent.

Description

Technical Field

[0001] The utility model relates to the technical field of surface density detection, in particular to a surface density full detection mechanism. Background Art

[0002] In the surface density detection of lithium battery electrodes, films, foils, etc., it has developed from random inspection to full inspection. The core idea of ​​achieving full inspection is line scanning, that is, generating a long strip of light spot covering the entire width of the test material, which is received and detected by a linear array detector. The relationship between the signal measurement value and the surface density is established through calibration, and continuous detection is performed in the direction of the tape, thereby realizing full line scanning inspection of wide-width materials.

[0003] Among them, in terms of X-ray surface density detection, there are three ways to generate long strips of light spots: X-ray line source, X-ray divergent source and X-ray distributed source. The disadvantages are as follows:

[0004] (1) X-ray source, combined with grid collimation in front of linear array detector, is an ideal way to achieve full inspection, but it is still some distance away from commercial X-ray source;

[0005] (2) X-ray divergence source: It uses a single high-power X-ray source to produce a long strip of light on a wide material through collimation constraints. However, its disadvantages are: when the width is large, the oblique incident angle of the rays at the edge is large, which is not conducive to the detection of the edge surface density profile. In addition, the difference in the radiation amount between the middle and edge positions is large, resulting in a large difference in the repeatability of the surface density detection at the edge position and the middle position.

[0006] (3) X-ray distribution source, whose focal points are distributed on a line, is lit up at the same time and the ray fan beams are spliced ​​on the test material. Since the test material is still a certain distance away from the linear array detector, after splicing on the test material, ray crossover will be formed on the linear array detector. Such crossover will affect the accuracy of surface density profile detection. Summary of the invention

[0007] The purpose of the utility model is to provide a surface density full detection mechanism to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a surface density full inspection detection mechanism, comprising a plurality of groups of detection units distributed along the running direction of the detection material, and each group of detection units is arranged on the same straight line along the width direction of the detection material, and two adjacent detection units in the width direction of the detection material are located on different straight lines respectively, and the effective detection width of the plurality of the detection units covers the width of the detection material.

[0009] Furthermore, the effective detection widths of the plurality of detection units are connected end to end in the width direction of the detection material, and the sum of the effective detection widths of the detection units is greater than the width of the detection material.

[0010] Furthermore, the detection units have the same structure, and all the detection units include a ray source, a collimator installed at the bottom of the ray source, and a linear array detector arranged directly below the collimator. The collimator is used to constrain the rays emitted by the ray source into a fan beam, and the fan beam is irradiated to the linear array detector to produce a long strip of light spot, and the long strip of light spot covers the length of the linear array detector. The linear array detector is used to receive the rays from the ray source.

[0011] Furthermore, several ray sources and collimators are fixed in the same outer shell, several linear array detectors are fixed in the same outer shell, a gap is reserved between the two outer shells to accommodate the passage of the material to be detected, and the height planes of the ray sources and linear array detectors are parallel to the plane of the material to be detected.

[0012] Furthermore, the ray sources and the linear array detectors correspond one to one, and the fan beam of any ray source will not irradiate other linear array detectors.

[0013] Compared with the prior art, the surface density full inspection mechanism proposed in the utility model generates a long strip light spot for line scanning full inspection and has the following beneficial effects:

[0014] The foci of the ray sources are adjacently and staggeredly distributed on two straight lines to avoid the influence of ray crossing on the accuracy of surface density profile detection;

[0015] The effective detection width of a single detection unit on the test material and the splicing of adjacent detection units are more flexible in dealing with the width of the test material, and can achieve full surface density inspection of any width of material;

[0016] The fan beam angle of a single detection unit is small, which avoids large-angle oblique incidence, and the difference in radiation amount at different positions on the long strip spot is small, so the effect of density detection across the entire width is relatively consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the detection unit of the utility model.

[0019] In the figure: 1, detection unit; 101, ray source; 102, collimation; 103, linear array detector. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "setting" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood in specific circumstances. In addition, in the description of the utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model.

[0021] During the full surface density inspection process, the long strip of material to be inspected continuously passes between the radiation source and the linear array detector. The radiation source emits radiation downward, and the linear array detector receives the radiation intensity that penetrates the material to be inspected and reaches the linear array detector, thereby realizing the full surface density inspection. The tape running direction involved in the utility model refers to the moving direction of the material to be inspected, and the width direction refers to the width direction of the material to be inspected.

[0022] See also Figure 1-2 , the utility model provides an embodiment: a surface density full inspection detection mechanism, including a plurality of groups of detection units 1 distributed along the direction of the detection material, and each group of detection units 1 is arranged on the same straight line along the width direction of the detection material, and two adjacent detection units 1 in the width direction of the detection material are respectively located on different straight lines, and the effective detection width of the plurality of detection units 1 covers the width of the detection material. In this embodiment, two groups of detection units 1 are arranged in total, and the two groups of detection units 1 are respectively arranged on two straight lines along the width direction of the detection material, and the detection units 1 on the two straight lines are arranged at intervals in the width direction of the detection material to avoid mutual influence between the detection units 1;

[0023] The detection units 1 have the same structure, and all of them include a ray source 101, a collimator 102 installed at the bottom of the ray source 101, and a linear array detector 103 arranged directly below the collimator 102. The collimator 102 is used to constrain the rays emitted by the ray source 101 into a fan-shaped beam, and the fan-shaped beam irradiates the linear array detector 103 to generate a long strip of light spots, and the long strip of light spots covers the length of the linear array detector 103. The linear array detector 103 is used to receive the rays from the ray source 101;

[0024] A plurality of ray sources 101 and collimators 102 are fixed in the same outer shell, and a plurality of linear array detectors 103 are fixed in the same outer shell, a gap is reserved between the two outer shells for accommodating the passage of the material to be detected, and the height planes of the ray sources 101 and the linear array detectors 103 are parallel to the plane of the material to be detected;

[0025] Specifically, the effective detection widths of the plurality of detection units 1 are connected end to end in the width direction of the detection material, and the sum of the effective detection widths of the detection units 1 is greater than the width of the detection material. In the actual detection process, the detection material passes between the ray source 101 and the linear array detector 103, and there is a height difference between the detection material and the linear array detector 103. Figure 2 , due to the magnification effect of the fan beam, the lengths irradiated on the detection material and the linear array detector 103 are not the same. The effective detection width of a single detection unit 1 on the detection material is w, and the effective detection width is the actual width of the linear array detector 103 corresponding to the detection under a certain geometric relationship. The distance from the focus of the ray source 101 to the detection material is L1, and the distance from the focus of the ray source 101 to the linear array detector 103 is L2, then the magnification ratio M=L2 / L1, the specific structure of the linear array detector 103 is the prior art, and will not be repeated here. In this embodiment, it includes n pixel detectors arranged along the width direction of the detection material, the length of a single pixel detector is a, and the length of the linear array detector 103 of a single detection unit 1 is n*a, then the effective detection width w=(n*a) / M;

[0026] The ray sources 101 and the linear array detectors 103 correspond one to one, and the fan beam of any ray source 101 will not irradiate other linear array detectors 103;

[0027] In this embodiment, the plurality of ray sources 101 have the same size and structure and are all located on the same height plane, the plurality of linear array detectors 103 have the same size and structure and are also located on the same height plane, and the effective detection width of the detection unit 1 is equal;

[0028] In one embodiment, the detection units 1 may be set to different sizes as required, so as to ensure that the effective detection widths of two adjacent detection units 1 are connected end to end;

[0029] In one embodiment, a plurality of ray sources 101 are located at different heights, and a plurality of linear array detectors 103 are located at the same height. Because the ray source 101 emits a fan-shaped beam, by adjusting its height or fan-beam angle, the length of the light spot irradiated to the inspection material (i.e., the effective inspection width of the inspection unit 1) can be adjusted by cooperating with the linear array detector 103 of corresponding length, so as to ensure that the effective inspection widths of two adjacent inspection units 1 are connected end to end.

[0030] In this embodiment, a total of N detection units 1 are provided. In order to meet the requirement of full surface density detection, the total detection width of the detection unit 1 N*w> the detection material width W. When the effective detection width w of the detection unit 1 is different, w1+w2+…+wN>W;

[0031] Before actual measurement, each pixel detector of the linear array detector 103 is calibrated using a surface density gradient sample of the target material. After calibration, a full surface density line scan is performed, and then the two-dimensional surface density distribution data obtained by the full line scan inspection is further processed. First, the surface density data obtained by the detection unit 1 distributed on two straight lines are aligned in the direction of the tape, and then the actual width size of the detection material is obtained based on the magnification ratio.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A surface density full inspection mechanism, characterized in that: It comprises a plurality of groups of detection units (1) distributed along the running direction of the detection material, and each group of detection units (1) is arranged on the same straight line along the width direction of the detection material, and two adjacent detection units (1) in the width direction of the detection material are respectively located on different straight lines, and the effective detection width of the plurality of detection units (1) covers the width of the detection material.

2. The surface density full inspection mechanism according to claim 1, characterized in that: The effective detection widths of the plurality of detection units (1) are connected end to end in the width direction of the detection material, and the sum of the effective detection widths of the detection units (1) is greater than the width of the detection material.

3. The surface density full inspection mechanism according to claim 1, characterized in that: The detection units (1) have the same structure, and each detection unit (1) comprises a ray source (101), a collimator (102) installed at the bottom of the ray source (101), and a linear array detector (103) arranged directly below the collimator (102), wherein the collimator (102) is used to constrain the rays emitted by the ray source (101) into a fan-shaped beam, the fan-shaped beam irradiates the linear array detector (103) to generate a long strip of light, and the long strip of light covers the length of the linear array detector (103), and the linear array detector (103) is used to receive the rays from the ray source (101).

4. The surface density full inspection mechanism according to claim 3 is characterized in that: A plurality of ray sources (101) and collimators (102) are fixed in the same outer shell, and a plurality of linear array detectors (103) are fixed in the same outer shell. A gap is reserved between the two outer shells for accommodating the passage of materials to be detected. The height planes of the ray sources (101) and the linear array detectors (103) are parallel to the plane of the materials to be detected.

5. The surface density full inspection mechanism according to claim 3, characterized in that: The ray sources (101) and the linear array detectors (103) correspond one to one, and the fan beam of any ray source (101) will not irradiate other linear array detectors (103).

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