Packing material welding quality detection device and detection method thereof

Abstract

The invention discloses a packing material welding quality detection device which comprises a first detection electrode and a second detection electrode which are arranged in a spaced mode, a detection area is formed between the first detection electrode and the second detection electrode, and the first detection electrode is provided with at least two first detection parts capable of controlling power-on and power-off respectively. The second detection electrode is provided with at least two second detection parts capable of respectively controlling power-on and power-off, and orthographic projections of the first detection parts and the second detection parts in the detection area have overlapped parts. The detection method comprises the following steps: S1, placing a welding area of a packing material in a detection area between the first detection electrode and the second detection electrode; s2, power-on and power-off of the first detection parts and the second detection parts are controlled correspondingly, and the welding quality of the corresponding positions of the overlapping parts is detected one by one; if the detection capacitors corresponding to all the overlapping parts are located in the set interval, it is indicated that the welding quality is qualified, and if the detection capacitor of any overlapping part is not located in the set interval, it is indicated that the welding quality is unqualified, and detection is directly ended.

Description

Technical Field

[0001] The present invention relates to food and medicine packaging equipment and methods, and in particular to a packaging material welding quality detection device and a detection method thereof. Background Art

[0002] Take the strip packaging bag (short for strip packaging) as an example. It is made by folding the composite film and then hot-melting the two ends. Its structure is as follows: Figure 1 As shown, the structure of the composite membrane is as follows Figure 2 As shown, it includes an aluminum film and PVC films arranged on both sides of the aluminum film. Figure 3 As shown, for the area with good welding, the surface of the strip package should be flat, while for the area with unqualified welding, the presence of unwelded parts will cause relatively small bulges on the surface of the strip package.

[0003] At present, the main methods for strip welding quality inspection are X-ray imaging inspection and ultrasonic inspection, which have defects such as high cost, low detection accuracy and inaccurate detection, and urgently need to be improved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a packaging material welding quality detection device with simple structure, low cost, high detection accuracy and fast detection speed.

[0005] The present invention further provides a detection method for the above-mentioned packaging material welding quality detection device.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A packaging material welding quality inspection device comprises a first inspection electrode and a second inspection electrode which are spaced apart, wherein an inspection area is formed between the first inspection electrode and the second inspection electrode, wherein the first inspection electrode is provided with at least two first inspection parts which can respectively control power on and off, and the second inspection electrode is provided with at least two second inspection parts which can respectively control power on and off, and the orthographic projections of the first inspection part and the second inspection part in the inspection area have an overlapping part.

[0008] As a further improvement of the above technical solution: the first detection portion and the second detection portion are both strip-shaped portions, and the first detection portion and the second detection portion are cross-distributed.

[0009] As a further improvement of the above technical solution: the first detection parts are arranged in parallel, and the second detection parts are arranged in parallel.

[0010] As a further improvement of the above technical solution: the distance between two adjacent first detection parts is equal, and the distance between two adjacent second detection parts is equal.

[0011] As a further improvement of the above technical solution: the first detection portion is formed by etching the first detection electrode, and the second detection portion is formed by etching the second detection electrode.

[0012] As a further improvement of the above technical solution: the first detection electrode and the second detection electrode are copper electrodes.

[0013] As a further improvement of the above technical solution: the first detection electrode and the second detection electrode are arranged in parallel.

[0014] As a further improvement of the above technical solution: the packaging material welding quality detection device also includes a first analog multi-way switch, a second analog multi-way switch and a control module, the first analog multi-way switch is electrically connected to each of the first detection parts, the second analog multi-way switch is electrically connected to each of the second detection parts, and the first analog multi-way switch and the second analog multi-way switch are both electrically connected to the control module.

[0015] As a further improvement of the above technical solution: the control module is a single chip microcomputer.

[0016] A detection method of the above-mentioned packaging material welding quality detection device comprises the following steps:

[0017] S1, the welding area of ​​the packaging material is placed in the detection area between the first detection electrode and the second detection electrode;

[0018] S2. Control the power on and off of each first detection part and each second detection part respectively, and detect the welding quality of each overlapping part one by one; if the detection capacitance corresponding to all overlapping parts is within the set range, it indicates that the welding quality is qualified; if the detection capacitance of any overlapping part is not within the set range, it indicates that the welding quality is unqualified and the detection is terminated directly.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] The packaging material welding quality detection device disclosed in the present invention has multiple first detection parts and second detection parts respectively arranged on the first detection electrode and the second detection electrode, each of the first detection part and the second detection part can control the on and off of power respectively, and the orthographic projection of the welding area on the packaging material has an overlapping part, and the electrode grid can be scanned to detect the capacitance between the two detection parts corresponding to the overlapping part to determine whether there is a bulge, thereby realizing the detection of tiny bulges in the welding area of ​​the packaging material, and the detection speed is fast, the detection efficiency is high, the whole device has a simple structure, and the cost is much lower than that of X-ray forming detection and ultrasonic detection.

[0021] The detection method of the packaging material welding quality detection device disclosed in the present invention determines whether a bulge exists by scanning the electrode grid and detecting the capacitance between the two detection parts corresponding to the overlapping parts. The detection speed is fast and the detection efficiency is high. In addition, the electric scanning detection has no mechanical wear, which is beneficial to extending the service life of the device.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 1 is a schematic structural diagram of a strip packaging bag according to the present invention, wherein a is a main view and b is a cross-sectional view.

[0024] Figure 2 It is a schematic diagram of the structure of the composite film material for making strip packaging bags.

[0025] Figure 3 It is a schematic diagram of the structure of the composite membrane material after welding, a is a good welding state, and b is an unqualified welding state.

[0026] Figure 4 It is a schematic diagram of the detection structure of the present invention.

[0027] Figure 5 yes Figure 4 Simplified schematic diagram.

[0028] Figure 6 Schematic diagram of the detection principle of the present invention

[0029] Figure 7 It is a structural schematic diagram of the packaging material welding quality detection device of the present invention.

[0030] Figure 8 It is a schematic diagram of the three-dimensional structure of the first detection electrode and the second detection electrode in the present invention.

[0031] Fig. 9 It is a schematic diagram of the orthographic projection structure of the first detection electrode and the second detection electrode in the welding area of ​​the present invention.

[0032] The symbols in the figure represent:

[0033] 1. First detection electrode; 11. First detection part; 2. Second detection electrode; 21. Second detection part; 3. Packaging material; 31. Welding area; 3a. Aluminum film; 3b. PVC film; 4. Overlapping part; 51. First analog multi-way switch; 52. Second analog multi-way switch; 53. Control module. DETAILED DESCRIPTION

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Embodiment 1

[0039] Figures 4 to 9 An embodiment of the packaging material welding quality detection device of the present invention is shown. The packaging material welding quality detection device of this embodiment includes a first detection electrode 1 and a second detection electrode 2 that are spaced apart, and a detection area is formed between the first detection electrode 1 and the second detection electrode 2. The first detection electrode 1 is provided with at least two first detection parts 11 that can control power on and off respectively, and the second detection electrode 2 is provided with at least two second detection parts 21 that can control power on and off respectively. The first detection part 11 and the second detection part 21 have an overlapping part 4 in the orthographic projection in the detection area.

[0040] See Figure 4During detection, the welding area 31 of the packaging material 3 is arranged between the detection area formed by the first detection electrode 1 and the second detection electrode 2. Since the packaging material 3 is formed by folding the composite film and welding the two ends, the two layers of aluminum film 3a at the interface of the packaging material 3 are electrically conductive, and the PVC film 3b has little effect on the capacitance between the first detection electrode 1 and the second detection electrode 2, which can be ignored. Therefore Figure 4 can be simplified to Figure 5 .

[0041] See Figure 5 The first detection electrode 1, the second detection electrode 2 and the aluminum film 3a form two capacitors connected in series. When the thickness of the aluminum film 3a changes, the change in the capacitance of the capacitor becomes the key to detection.

[0042] According to the capacitance calculation formula: C = ε * ε 0 *S / d;

[0043] where ε 0 Constant, in this embodiment, the value is 8.86*10 -12 F / M, S is the area of ​​electrodes facing each other, and d is the distance between electrodes.

[0044] See Figure 6 , then C 1 =ε*ε 0 *S 1 / d 1 , C 2 =ε*ε 0 *S 2 / d 2 ;

[0045] where d 1 and d 2 , respectively, the distances between the first detection electrode 1, the second detection electrode 2 and the aluminum film 3a;

[0046] Total capacitance C = C 1 *C 2 / (C 1 +C 2 )=ε*ε 0 *S 1 / (d 1 +d 2 );

[0047] Current I=U*2*Pi*f*C=2*Pi*f*ε*ε 0 *S 1 *U / (d 1 +d 2 );

[0048] Where U is the power supply voltage and f is the power supply frequency;

[0049] It can be seen that the total capacitance is only related to the electrode area S 1 d 1 +d 2 It is related to the position of the aluminum film 3a between the first detection electrode 1 and the second detection electrode 2. When there is a bulge in the welding part, it is equivalent to Figure 6 The thickness of the aluminum film 3a in the 1 +d 2 changes, specifically 1 +d 2 The value becomes smaller.

[0050] The thickness of the welding part is generally equal to the thickness of the two layers of composite film, about 50um. In addition to the unevenness of the film welding part such as the indentation, the distance between the first detection electrode 1 and the second detection electrode 2 of the capacitor is preferably ≥500um. Assuming that d 0 =500um, the current detection level current I change of 2% can be detected, then the detection accuracy is equal to 500*2%=10um, which means that the thickness change caused by hollowing can be detected if it exceeds 10um. Of course, this refers to the accuracy of detecting thickness changes. If the area of ​​the electrode is 1mm 2 , then 1mm can be detected 2 The area bulge is 10um, which is a conservative estimate. The accuracy can be further improved by using electrode scanning and signal digital processing. The time to detect a 20mm*60mm area at the same time is about 10ms, which can fully match the previous detection of the strip pack filling machine.

[0051] In the packaging material welding quality detection device of the present embodiment, a plurality of first detection parts 11 and second detection parts 21 are respectively arranged on the first detection electrode 1 and the second detection electrode 2, and each of the first detection part 11 and the second detection part 21 can control the on and off of the power respectively, and the positive projection of the welding area 31 on the packaging material 3 has an overlapping part 4, and the capacitance between the two detection parts corresponding to the overlapping part 4 can be detected by scanning the electrode grid to determine whether there is a bulge, thereby realizing the detection of tiny bulges in the welding area 31 of the packaging material 3, and the detection speed is fast, the detection efficiency is high, the whole device has a simple structure, and the cost is much lower than that of X-ray forming detection and ultrasonic detection.

[0052] See Figures 7 to 9As a preferred embodiment, the first detection part 11 and the second detection part 21 are both strip-shaped parts, and the first detection part 11 and the second detection part 21 are distributed vertically, so that a plurality of regular rectangular overlapping parts 4 can be formed in the welding area 31 of the packaging material 3, or the welding area 31 is divided into a plurality of rectangular detection positions. For example, if there are 30 first detection parts 11 and 30 second detection parts 21, and the width is 1mm, then 900 1mm*1mm square overlapping parts 4 will be formed. The more the number of overlapping parts 4, the wider the distribution range, and the smaller the area of ​​a single overlapping part 4, the more conducive to improving the accuracy and comprehensiveness of the detection. Of course, in other embodiments, the first detection part 11 and the second detection part 21 can also adopt other forms, and the intersection angle can also be adjusted.

[0053] As a preferred embodiment, the first detection parts 11 are arranged in parallel, and the second detection parts 21 are arranged in parallel, so as to form a regular overlapping part 4 in the welding area 31 .

[0054] As a preferred embodiment, the distance between two adjacent first detection parts 11 is equal, and the distance between two adjacent second detection parts 21 is equal, that is, the first detection part 11 and the second detection part 21 are evenly distributed on the first detection electrode 1 and the second detection electrode 2, which is conducive to achieving uniform distribution of the overlapping part 4 in the welding area 31, and is conducive to ensuring uniform and comprehensive detection positions.

[0055] As a preferred embodiment, the first detection part 11 is formed by etching the first detection electrode 1, and the second detection part 21 is formed by etching the second detection electrode 2, which is conducive to improving the processing accuracy of the first detection part 11 and the second detection part 21, especially when the number of the first detection part 11 and the second detection part 21 is large and the width is narrow, thereby improving the detection accuracy. Of course, in other embodiments, the first detection part 11 and the second detection part 21 can also be processed by other methods.

[0056] As a preferred embodiment, the first detection electrode 1 and the second detection electrode 2 are copper electrodes. Copper electrodes have good electrical conductivity and are easy to process into multiple first detection parts 11 and second detection parts 21. Of course, in other embodiments, the first detection electrode 1 and the second detection electrode 2 may also be made of other conductive materials, such as aluminum.

[0057] As a preferred embodiment, the first detection electrode 1 is arranged in parallel with the second detection electrode 2. Specifically, the first detection electrode 1 is located above the second detection electrode 2, the first detection portion 11 is provided on the lower surface of the first detection electrode 1, and the second detection portion 21 is provided on the upper surface of the second detection electrode 2. Since the first detection electrode 1 is arranged in parallel with the second detection electrode 2, when the welding quality of the packaging material 3 is qualified, the distance between the first detection electrode 1 and the second detection electrode 2 is equal, which is conducive to reducing the difficulty of detection. For details, see Figure 8During detection, the welding area 31 of the packaging material 3 is placed parallel to the first detection electrode 1 and the second detection electrode 2, which is conducive to ensuring the accuracy of the detection result.

[0058] See Figure 7 In this embodiment, the packaging material welding quality detection device further includes a first analog multi-way switch 51, a second analog multi-way switch 52 and a control module 53. The first analog multi-way switch 51 is electrically connected to each first detection part 11, and the second analog multi-way switch 52 is electrically connected to each second detection part 21. The first analog multi-way switch 51 and the second analog multi-way switch 52 are both electrically connected to the control module 53. As a preferred embodiment, the control module 53 is a single chip microcomputer. That is, in this embodiment, the first analog multi-way switch 51, the second analog multi-way switch 52 and the control module 53 are used to control the on and off of each first detection part 11 and the second detection part 21, respectively, and the electrode scanning of 900 square overlapping parts 4 is completed in sequence. Compared with X-ray molding detection and ultrasonic detection, the detection speed is fast and the cost is low.

[0059] Embodiment 2

[0060] The detection method of the packaging material welding quality detection device of this embodiment includes the following steps:

[0061] S1, the welding area 31 of the packaging material 3 is placed in the detection area between the first detection electrode 1 and the second detection electrode 2;

[0062] S2. Control the power on and off of each first detection part 11 and each second detection part 21 respectively, and detect the welding quality of the corresponding part of each overlapping part 4 one by one; if the detection capacitance corresponding to all overlapping parts 4 is within the set range, it indicates that the welding quality is qualified. If the detection capacitance of any overlapping part 4 is not within the set range, it indicates that the welding quality is unqualified and the detection is terminated directly.

[0063] The detection method of the packaging material welding quality detection device of this embodiment determines whether there is a bulge by scanning the electrode grid and detecting the capacitance between the two detection parts corresponding to the overlapping part 4. The detection speed is fast and the detection efficiency is high. In addition, the electrical scanning detection has no mechanical wear, which is beneficial to extending the service life of the device.

[0064] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A packaging material welding quality detection device, characterized in that: The invention comprises a first detection electrode (1) and a second detection electrode (2) which are arranged at intervals, wherein a detection area is formed between the first detection electrode (1) and the second detection electrode (2), the first detection electrode (1) is provided with at least two first detection parts (11) which can be respectively controlled to be on or off, the second detection electrode (2) is provided with at least two second detection parts (21) which can be respectively controlled to be on or off, and the orthographic projections of the first detection part (11) and the second detection part (21) in the detection area have an overlapping part (4).

2. The packaging material welding quality detection device according to claim 1 is characterized in that: The first detection portion (11) and the second detection portion (21) are both strip-shaped portions, and the first detection portion (11) and the second detection portion (21) are cross-distributed.

3. The packaging material welding quality detection device according to claim 2 is characterized in that: The first detection parts (11) are arranged in parallel, and the second detection parts (21) are arranged in parallel.

4. The packaging material welding quality detection device according to claim 3 is characterized in that: The distance between two adjacent first detection parts (11) is equal, and the distance between two adjacent second detection parts (21) is equal.

5. The packaging material welding quality detection device according to any one of claims 1 to 4, characterized in that: The first detection portion (11) is formed by etching the first detection electrode (1), and the second detection portion (21) is formed by etching the second detection electrode (2).

6. The packaging material welding quality detection device according to claim 5, characterized in that: The first detection electrode (1) and the second detection electrode (2) are copper electrodes.

7. The packaging material welding quality detection device according to any one of claims 1 to 4, characterized in that: The first detection electrode (1) and the second detection electrode (2) are arranged in parallel.

8. The packaging material welding quality detection device according to any one of claims 1 to 4, characterized in that: The invention also comprises a first analog multi-way switch (51), a second analog multi-way switch (52) and a control module (53), wherein the first analog multi-way switch (51) is electrically connected to each of the first detection units (11), the second analog multi-way switch (52) is electrically connected to each of the second detection units (21), and the first analog multi-way switch (51) and the second analog multi-way switch (52) are both electrically connected to the control module (53).

9. The packaging material welding quality detection device according to claim 8, characterized in that: The control module (53) is a single chip microcomputer.

10. A detection method for a packaging material welding quality detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, the welding area (31) of the packaging material (3) is placed in the detection area between the first detection electrode (1) and the second detection electrode (2); S2, respectively controlling the on and off of each first detection part (11) and each second detection part (21), and detecting the welding quality of each overlapping part (4) one by one; if the detection capacitance corresponding to all overlapping parts (4) is within a set interval, it indicates that the welding quality is qualified; if the detection capacitance of any overlapping part (4) is not within the set interval, it indicates that the welding quality is unqualified and the detection is terminated directly.

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