Method, system and process for monitoring warp and weft shrinkage of electronic glass fiber cloth

Abstract

The present invention discloses a warp and weft shrinkage monitoring method, system and process for electronic-grade fiberglass cloth, which relates to the technical field of fiberglass cloth production and processing, and includes: S1. Establish an open-fiber database, which includes: recording the warp density n and weft density m during the open-fiber treatment; obtaining the widths of the warp and weft after the open-fiber treatment, and recording them one by one according to the corresponding warp density n and weft density m to obtain relationship data one; the relationship data one is stored in a preset open-fiber database; S2. Shrinkage characteristic analysis, which includes: obtaining the current warp density n1, weft density m1 and cloth width; searching the open-fiber database based on n1 and m1 to obtain the matching relationship data one; obtaining the warp and weft distribution parameters after open-fiber according to the relationship data one and the cloth width; calculating the similarity in the warp direction and weft direction, and integrating the relationship data one as monitoring data for output. This application has the effect of reducing the warping of the PCB board substrate.

Description

Technical Field

[0001] This application relates to the technical field of glass fiber cloth production and processing, and particularly to a method, system and process for monitoring the warp and weft shrinkage of electronic-grade glass fiber cloth. Background Art

[0002] Glass fiber cloth, copper foil and resin are the three major raw materials for making circuit boards. The glass fiber cloth and resin are combined to obtain a film, and then it is hot-pressed with a copper plate to obtain a PCB substrate.

[0003] Currently, with the popularization of technologies such as surface mount technology (SMT), PCB manufacturers have put forward more stringent requirements for the board bending and warping of CCL (copper clad laminate). Facing this situation, combined with the requirements of PCB customers for CCL, CCL manufacturers attach great importance to the board bending and warping problems, and strictly control and prevent the entire process of the substrate board bending and warping from the raw materials to meet the quality requirements of customers.

[0004] As the base material of the reinforced composite material, the orientation of glass fibers in the flow direction will limit the shrinkage of the resin. If the longitudinal shrinkage of the product is less than the transverse shrinkage, this uneven shrinkage will cause the warping of the composite material. Therefore, this application proposes a new technical solution. Summary of the Invention

[0005] In order to reduce the warping of the PCB board substrate, this application provides a method, system and process for monitoring the warp and weft shrinkage of electronic-grade glass fiber cloth.

[0006] In the first aspect, this application provides a method for monitoring the warp and weft shrinkage of electronic-grade glass fiber cloth, adopting the following technical solutions:

[0007] A method for monitoring the warp and weft shrinkage of electronic-grade glass fiber cloth includes:

[0008] S1. Establish an open-fiber database, which includes:

[0009] Record the warp density n and weft density m of the open-fiber treatment; where n and m are integers and the units include roots / inch and roots / cm;

[0010] Obtain the widths of the warp and weft after the open-fiber treatment, and record them one by one according to the corresponding warp density n and weft density m to obtain relationship data one;

[0011] The relationship data one is stored in a preset open-fiber database;

[0012] S2. Shrinkage characteristic analysis, which includes:

[0013] Obtain the current warp density n1, weft density m1 and the cloth width;

[0014] Search the fiber - opening database based on n1 and m1 to obtain the matching relational data one;

[0015] Obtain the warp - and - weft distribution parameters after fiber - opening according to the relational data one and the fabric width;

[0016] Calculate the similarity in the warp and weft directions, and integrate the relational data one as the monitoring data for output.

[0017] In a second aspect, the present application provides a warp - and - weft shrinkage monitoring system for electronic - grade fiberglass cloth, adopting the following technical solution:

[0018] A warp - and - weft shrinkage monitoring system for electronic - grade fiberglass cloth, comprising:

[0019] A warp - and - weft parameter acquisition module, which is at least used to obtain the current warp density n1, weft density m1, and width;

[0020] A control module, which is electrically connected to the warp - and - weft parameter acquisition module;

[0021] Wherein, the control module is configured as:

[0022] Search the preset fiber - opening database based on the current warp density n1 and weft density m1 to obtain the matching relational data one; wherein, the relational data one includes the widths of the warp and weft after fiber - opening treatment when the warp density is n and the weft density is m, n1 ∈ n, m1 ∈ m;

[0023] Obtain the warp - and - weft distribution parameters after fiber - opening according to the relational data one and the fabric width;

[0024] Calculate the similarity in the warp and weft directions;

[0025] If the similarity does not reach the preset consistency condition, generate a board - bending and board - warping prompt.

[0026] Optionally, the warp - and - weft parameter acquisition module includes a fiber - passing detection board, and the fiber - passing detection board includes a frame, a limiting ring, a traction wire, and a sensor one;

[0027] The frame is provided with a detection cavity, there are multiple limiting rings suspended in the detection cavity, any one of the limiting rings is connected to at least three traction wires, the multiple traction wires on the same limiting ring are evenly distributed around the limiting ring, the end of the traction wire away from the limiting ring is movably connected to the frame, the sensor one is installed on the frame and used to sense the movement of each traction wire, and the limiting ring is used for the warp and weft to be woven into cloth to pass through;

[0028] The sensor one is electrically connected to the control module, and the control module is configured as: judge whether there are warp and weft passing through the limiting ring according to the feedback of the sensor one, and count to obtain n1 and m1.

[0029] Optionally, the frame is provided with connection holes. One end of the traction wire away from the limiting ring is fixed with a conductive block, and the conductive block is slidably connected to the connection holes. The first inductor includes a positive conductive ring and a negative conductive ring. The positive conductive ring is fixed to the outer edge of the connection hole, and the negative conductive ring is located inside the connection hole, passed through by the traction wire and fixed to the conductive block. The negative conductive rings connected to the conductive blocks on the multiple traction wires connected to the same limiting ring are separated from the corresponding positive conductive rings, and the positive conductive rings and the negative conductive rings are electrically connected to the control module.

[0030] Optionally, the warp and weft density acquisition module further includes a development detection table, which includes a table body, a vision unit, and a linear drive unit. An installation groove is concavely formed on the table body, and an anti-color pad is laid in the installation groove. Different-color strips are arranged on the anti-color pad. Multiple different-color strips form a group, and the colors and lengths of the different-color strips in the same group are different. Multiple groups of different-color strips are arranged along the direction perpendicular to the direction in which the fiberglass cloth passes over the table body. A transparent top plate is embedded in the installation groove, and the transparent top plate covers the anti-color pad.

[0031] The vision unit is located above the table body with the lens facing downwards, and the linear drive unit is used to drive the vision unit to move. The linear drive unit can at least drive the vision unit along the distribution direction of the multiple different-color strips.

[0032] The vision unit and the linear drive unit are respectively connected to the control module.

[0033] Optionally, a light homogenizing light source is arranged in the installation groove, and holes corresponding to the light homogenizing light source are formed on the anti-color pad. The light homogenizing light source is electrically connected to the control module. The control module is configured to: obtain an image of the cloth directly above the light homogenizing light source and obtain the warp density n1 and the weft density m1 based on the image, and adjust the warp and weft distribution parameters after fiber opening.

[0034] Optionally, a vision moving mechanism is further included, which includes an annular plate, a rotating frame, and a vision magnification module. The rotating frame is rotatably connected above the table body. A reduction motor for driving the rotating frame to rotate and an inductor two for detecting the rotation amount are installed above the table body. The reduction motor and the inductor two are electrically connected to the control module.

[0035] The annular plate is fixed to the lower part of the rotating frame. The linear drive unit is installed on the annular plate and the driving direction is the radial direction of the annular plate. The vision unit is fixed to the driving part of the linear drive unit. A vision magnification module is arranged below the vision unit. The vision magnification module is located directly above the light homogenizing light source and is fixed to the annular plate.

[0036] Optionally, the visual magnification module includes a structural base, elastic stoppers, and a cover plate. A vertical light passing hole is provided on the structural base, and a lens for magnification is disposed inside the light passing hole;

[0037] The cover plate is close to the upper part of the structural base and is provided with a middle hole matching the light passing hole. The cover plate is slidably connected to the structural base, and the sliding direction is parallel to the driving direction of the linear drive unit; two limit blocks are fixed to the bottom of the cover plate. The length directions of the two limit blocks are horizontally perpendicular to the sliding direction of the cover plate, and the distribution direction of the two limit blocks is parallel to the length direction of the limit blocks;

[0038] A first stop block and a second stop block are fixed to the upper part of the structural base. The first stop block is located on the side of the light passing hole away from the center of the annular plate, and the second stop block is located on the side of the first stop block away from the light passing hole;

[0039] The elastic stoppers are fixed to the upper part of the cover plate. The visual unit is located above the cover plate, and the lower edge is higher than the upper edge of the elastic stoppers;

[0040] If the visual unit is aligned with the light passing hole, the middle hole is synchronously aligned. The side of the visual unit away from the center of the annular plate is close to the side of the elastic stopper facing the center of the annular plate, and the side of the first stop block facing away from the center of the annular plate is in contact with the side wall of a limit block;

[0041] If the visual unit is located on the side of the structural base away from the center of the annular plate, the visual unit is located on the side of the elastic stopper away from the center of the annular plate. The other limit block is in contact with the side of the second stop block facing the center of the annular plate, and the cover plate blocks the light passing hole.

[0042] In a third aspect, the present application provides an electronic glass fiber cloth warp and weft shrinkage monitoring process, adopting the following technical solution:

[0043] An electronic glass fiber cloth warp and weft shrinkage monitoring process applies the electronic glass fiber cloth warp and weft shrinkage monitoring method as described above by using the electronic glass fiber cloth warp and weft shrinkage monitoring system as described in any one of the above.

[0044] In summary, the present application includes the following beneficial technical effects: The similarity of the calculated warp and weft directions of the glass fiber cloth can be analyzed and given to the staff as a prompt to guide the staff to adjust the warp and weft densities during the weaving of the glass fiber cloth, or adjust the fiber opening device to change the widths of the warps and wefts after fiber opening, so that the longitudinal and transverse shrinkage rates of the glass fiber cloth and the resin during injection molding are as consistent as possible, thereby reducing the warpage degree of the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is the main flowchart of the method of the present application;

[0046] Figure 2It is a schematic diagram of a partial longitudinal section of the fiber routing detection board of the system of the present application;

[0047] Figure 3 It is a schematic diagram of the overall structure of the developing detection table of the system of the present application;

[0048] Figure 4 It is a schematic diagram of the control structure of the system of the present application;

[0049] Figure 5 It is a schematic diagram of the connection structure of the visual activity mechanism, the linear drive unit and the visual unit of the present application;

[0050] Figure 6 It is a partial explosion diagram of the visual activity mechanism of the present application.

[0051] Explanation of reference numerals: 1, control module; 2, fiber routing detection board; 21, frame; 211, connection hole; 22, limiting ring; 23, traction wire; 24, sensor 1; 241, positive conductive ring; 242, negative conductive ring; 25, conductive block; 3, table body; 31, guiding roller; 32, installation groove; 33, anti-color backing plate; 4, visual unit; 5, linear drive unit; 6, uniform light source; 7, visual activity mechanism; 71, ring plate; 72, rotating frame; 73, visual magnification module; 731, structure base; 732, elastic retaining strip; 733, cover plate; 734, limiting block; 735, stop block 1; 736, stop block 2; 74, reduction motor; 8, sensor 2. Detailed implementation manners

[0052] The following further describes the present application in detail with reference to the Figure 1-6 accompanying drawings.

[0053] An embodiment of the present application discloses a method for monitoring the warp and weft shrinkage of an electronic grade glass fiber cloth.

[0054] Referring to Figure 1 , the method for monitoring the warp and weft shrinkage of an electronic grade glass fiber cloth includes:

[0055] S1. Establish a fiber opening database;

[0056] S2. Shrinkage characteristic analysis.

[0057] It can be understood that for a glass fiber cloth, in order to ensure the wettability of the resin faster, it is necessary to thin and uniformize the glass fiber cloth. At present, the above two goals are achieved by performing a fiber opening treatment on the glass fiber cloth. Therefore, this method monitors and analyzes the warp and weft shrinkage of the glass fiber cloth by the number of warp and weft yarns used in weaving and the changes after fiber opening, so that the shrinkage rate in the longitudinal and transverse directions is as consistent as possible with the resin during injection molding, thereby reducing the warping of the plate.

[0058] The specific elaboration is as follows.

[0059] The above S1, establishing a fibrillating database, includes:

[0060] Recording the warp density n and weft density m for fibrillating treatment; where n and m are integers and the units include roots / inch and roots / cm.

[0061] Obtaining the widths of the warp and weft after fibrillating treatment, and recording them one by one according to the corresponding warp density n and weft density m to obtain the first set of relational data; Example: 44 warp roots / inch, 34 weft roots / inch, warp width d1 mm, weft width d2 mm.

[0062] The first set of relational data is stored in a preset fibrillating database.

[0063] It can be understood that the staff can pre-weave fabrics with different warp and weft combinations on the market and send them to the fibrillating equipment for treatment to obtain a fibrillating database with relatively rich data; if necessary, an empirical mathematical relationship (mathematical formula) between the warp and weft densities and the warp and weft widths can also be established based on the data in the fibrillating database.

[0064] S2, real-time monitoring and analysis, includes:

[0065] Obtaining the current warp density n1, weft density m1, and fabric width; it should be noted that: the current here includes: the glass fiber is woven into a fabric, and before the fibrillating treatment of the glass fiber fabric; where the fabric width refers to the distance between the leftmost and rightmost warp yarns of the fabric. It can be understood that the length of the fabric weft yarns extends slightly beyond the outermost warp yarns to prevent thread breakage.

[0066] Searching the fibrillating database based on n1 and m1 to obtain the matching first set of relational data.

[0067] Obtaining the fibrillated warp and weft distribution parameters according to the first set of relational data and the fabric width; specifically: taking the example starting along the weft direction: (d1*44 + d2*34) = 1 inch, fabric width / 1 inch = number of cycles Y; assuming the warp and weft alternate, then: d1, d2,... until all 44 d1s and 34 d2s are one cycle. If Y is an integer, repeat Y times; if Y is a non-integer, then repeat the integer Y1 obtained after removing the non-decimal part of Y times, and add a cycle segmented by a decimal.

[0068] Calculating the similarity in the warp and weft directions, and integrating the first set of relational data as monitoring data for output.

[0069] Among them, the calculation example of the similarity: find the total sum of the warp widths one, find the total sum of the weft widths two, and compare to obtain the similarity.

[0070] According to the above settings, the staff adjusts the warp and weft densities during the weaving of the fiberglass cloth according to the prompts, or adjusts the fiber-opening equipment to change the widths of the warp and weft yarns after fiber opening, so that the fiberglass cloth and the resin have as consistent shrinkage rates as possible longitudinally and transversely during injection molding, thereby reducing the warpage of the plate.

[0071] It can be understood that when performing the above similarity analysis, it should be more accurate to add the gaps between the warp and weft yarns. Therefore, in another embodiment of the present application, a unit area is sampled from the cloth to obtain the warp and weft distribution parameters in the unit area, calculate the number of unit areas, and then obtain the overall warp and weft distribution parameters, rather than directly obtaining the warp and weft distribution parameters in a unit in density units (number of roots / inch) and then analyzing the warp and weft distribution parameters.

[0072] The embodiment of the present application also discloses an electronic-grade fiberglass cloth warp and weft shrinkage monitoring system.

[0073] Refer to Figures 2-4 , the electronic-grade fiberglass cloth warp and weft shrinkage monitoring system includes: a warp and weft parameter acquisition module and a control module 1. Among them, the warp and weft parameter acquisition module is at least used to obtain the current warp density n1, weft density m1, and width; the control module 1 is electrically connected to the warp and weft parameter acquisition module and is configured as:

[0074] Based on the current warp density n1 and weft density m1, search the preset fiber-opening database to obtain the matching relationship data one; wherein, the relationship data one includes the widths of the warp and weft yarns after fiber-opening treatment when the warp density is n and the weft density is m, n1 ∈ n, m1 ∈ m;

[0075] Calculate according to the relationship data one to obtain the warp-wise width distribution parameter and the weft-wise width distribution parameter;

[0076] Calculate the similarity between the warp-wise width distribution parameter and the weft-wise width distribution parameter;

[0077] If the similarity does not reach the preset consistency condition (such as: threshold), then generate a plate bending and warping prompt.

[0078] The data analysis of the above control module 1 has been described in the embodiment of the foregoing method, so it will not be elaborated here, and the following will elaborate on other content.

[0079] Refer to Figure 2, in an embodiment of the present system, the warp and weft parameter acquisition module includes a fiber walking detection board 2, and the fiber walking detection board 2 includes a frame 21, a limiting ring 22, a traction wire 23, and a first inductor 24. The front view of the frame 21 is a rectangular or circular frame structure. In this embodiment, the rectangular shape is taken as an example. A detection cavity is formed inside the frame 21. There are multiple limiting rings 22, which are suspended and distributed in the detection cavity; any one of the limiting rings 22 is connected to at least three traction wires 23. In this embodiment, three are taken as an example for illustration.

[0080] The three traction wires 23 on the same limiting ring 22 are evenly distributed around the limiting ring 22, and the end of the traction wire 23 far away from the limiting ring 22 is movably connected to the frame. The first inductor 24 is installed on the frame 21 and is used to sense the movement of each traction wire 23. The fiber walking detection board 2 is installed on the feeding path of a knitting device, and each warp yarn and weft yarn passes through the limiting ring 22 respectively.

[0081] The first inductor 24 is electrically connected to the control module 1, and the control module is configured to: judge whether there are warp yarns and weft yarns passing through the limiting ring 22 according to the feedback of the first inductor 24, and obtain n1 and m1 through statistics; that is, when a limiting ring 22 moves due to the passing of warp yarns and weft yarns, it is detected by the first inductor 24, and the control module 1 can count correspondingly to obtain the corresponding data.

[0082] According to the above settings, the present system can quickly detect the number of warps and wefts of the glass fiber cloth to be prepared by using the fiber walking detection board 2, and calculate the warp and weft density based on this, providing a basis for the control module 1 to analyze the warp and weft similarity (warp and weft shrinkage).

[0083] Refer to Figure 2 , the frame 21 is provided with a connection hole 211. A conductive block 25 is fixed at the end of the traction wire 23 far away from the limiting ring 22, and the conductive block 25 is slidably connected to the connection hole. The first inductor 24 includes a positive conductive ring 241 and a negative conductive ring 242. The positive conductive ring 241 is fixed on the outer edge of the connection hole, and the negative conductive ring 242 is located inside the connection hole and is passed through by the traction wire 23 and fixed to the conductive block 25. The negative conductive rings 242 connected to the conductive blocks 25 on the multiple traction wires 23 connected to the same limiting ring 22 are separated from the corresponding positive conductive rings 241. For example, one traction wire 23 is vertical, and the corresponding positive conductive ring 241 and negative conductive ring 242 of this traction wire 23 are in contact with each other, while the other two traction wires 23 extend obliquely towards both sides and the corresponding positive conductive rings 241 and negative conductive rings 242 are in contact with each other.

[0084] When the warp and weft yarns pass through it, as long as the position of the frame 21 is reasonably arranged so that the working warp and weft yarns of the knitting device laterally pull the limiting ring 22, then only by connecting the positive conductive ring 241 and the negative conductive ring 242 to the signal int terminal and out terminal of the control module 1 with wires, it is possible to judge whether there are warp and weft yarns passing through the limiting ring 22 by whether there is a level signal feedback.

[0085] Relatively speaking, the above settings have a relatively simple structure and low cost.

[0086] It can be understood that the above content can be used to provide reference and guidance for workers when knitting fiberglass cloth. Considering that some manufacturers are not involved in the processing of knitting fabrics but are engaged in subsequent fiber opening and substrate production and directly purchase fabrics, the warp and weft parameter acquisition module further includes: a developing detection table, refer to Figures 3-5 , and the developing detection table includes a table body 3, a vision unit 4, and a linear drive unit 5.

[0087] The table body 3 is installed on the feeding path of the fiberglass cloth, that is, the fiberglass cloth is fed while adhering to its upper table surface. For this purpose, two guiding rollers 31 can be installed on the table body 3 using bearing seats. The fiberglass cloth passes under the guiding rollers 31 and moves from one guiding roller 31 to another guiding roller 31.

[0088] An installation groove 32 is recessed in the table body 3, and the installation groove 32 is located between the two guiding rollers 31. An anti-color backing plate 33 is laid in the installation groove 32. The anti-color backing plate 33 can be black and has different-color strips painted on it with pigments. The different-color strips are grouped in multiple numbers, and the colors and lengths of the different-color strips in the same group are different. Multiple groups of different-color strips are arranged along the direction perpendicular to the direction in which the fiberglass cloth passes over the table body 3. A transparent top plate is embedded in the installation groove 32, and the transparent top plate covers the anti-color backing plate 33.

[0089] The setting of the different-color strips is to enable the edge position of the fabric to be more clearly identified and positioned after the fabric falls on the transparent top plate, so as to obtain the width of the fabric through the different-color strips corresponding to the two fabric edges. The different-color strips can have scales. Example: The position of one of the outermost different-color strips represents zero, and so on.

[0090] Refer to Figure 5 , the vision unit 4 is located above the table body 3 and the lens faces downward. The linear drive unit 5 is used to drive the vision unit 4 to move horizontally, and the linear drive unit 5 can at least drive the vision unit 4 to move along the distribution direction of multiple different-color strips. The vision unit 4 and the linear drive unit 5 are respectively connected to the control module 1.

[0091] According to the above settings, first, the control module 1 can control the linear drive unit 5 to drive the vision unit 4 to move above the edge of the fabric, so that the vision unit 4 can collect images. Then, through image feature recognition, it can identify which color - different stripe the edge of the fabric aligns with, and calculate the width of the fabric by looking up the pre - stored color - different stripe - position data table. Secondly, through image feature recognition, the warp and weft yarns can be identified, and the number, width, and distribution law of the warp and weft in the field of view can be obtained. Moreover, since the distribution law of the warp and weft at this time is actually obtained, rather than analyzed in the preset fixed manner (such as analyzed by alternating appearance) described in the previous method, more accurate warp and weft distribution parameters can be obtained. That is, based on the image, in addition to obtaining the warp and weft densities, the warp and weft distribution parameters after fiber opening are adjusted according to the actual feature performance.

[0092] The above - mentioned vision recognition features, vision measurement dimensions, and vision counting are all prior arts, so they will not be elaborated here. The process example includes: image pre - processing, feature positioning, contour extraction, recognition, distance transformation, feature contour counting, and calculating the pixel size and converting it to the actual size with a scale.

[0093] Refer to Figure 3 , in another embodiment of the present system, in order to reduce the interference caused by the fabric boundary, color - different stripes, etc., the image for obtaining the number, width, and distribution law of the warp and weft needs to be re - photographed, and the photographing position can be the middle of the table body 3. Further, in order to make the feature recognition of the warp and weft yarns more accurate, a uniform light source 6 is embedded and installed at the center of the above - mentioned installation groove 32, and corresponding holes are opened on the anti - color backing plate 33; the vision unit 4 photographs the fabric directly above the uniform light source.

[0094] The uniform light source 6 is electrically connected to the control module 1 through a relay switch signal port for automatic opening and closing optimization; when it is turned on, the vision unit 4 is directly above and collects images, and it is turned off at other times to save energy; the light color of the uniform light source 6 can be colored light such as blue light.

[0095] Refer to Figures 3-5 , in another embodiment of the present system, it further includes a vision moving mechanism 7. The vision moving mechanism 7 includes an annular plate 71, a rotating frame 72, and a vision magnifying module 73.

[0096] A rotating shaft is formed on the upper part of the rotating frame 72. The rotating shaft is rotatably connected to the cross - beam structure of a gantry frame spanning above the table body 3, and a reduction motor 74 is installed on the cross - beam; an inductor two 8 is also installed on the cross - beam. The inductor two 8 can be a rotary encoder, coaxially fixed to the output shaft of the rotating shaft or the reduction motor. The reduction motor 74 and the inductor two 8 are respectively electrically connected to the control module 1. The control module 1 can be a PLC controller and an industrial host electrically connected to the PLC controller.

[0097] The annular plate 71 is fixed to the lower part of the rotating frame 72 through a radially extending inner frame body. The linear drive unit 5 can be a linear motor and is fixed to the annular plate 71. The slider of the linear motor is installed with the vision unit 4. The vision magnification module 73 is fixed to the lower part of the annular plate 71 by a connecting rod and is directly below the position where the vision unit 4 photographs the uniform light source 6 area. The vision magnification module 73 can be a light-tight structure with a vertical light passing hole, and multiple lenses are fixed in the light passing hole from top to bottom. The specific size of the lens is determined according to the magnification required on site, and the magnification can be 30 times.

[0098] During use, if you want to switch from collecting images at the cloth boundary to collecting images at the center, the control module 1 only needs to output movement control parameters to control the linear drive unit 5 to drive the vision unit 4 to move to an area close to the center of the annular plate 71; when it is necessary to position the boundary of the cloth to calculate the width of the cloth, the vision unit 4 does not need to move. The control module 1 only needs to output rotation control parameters to control the reduction motor 74 to drive the rotating frame 72 to rotate 180°, and the vision unit 4 can quickly reach the approximate position.

[0099] According to the above settings, the system has the following effects: Only one vision unit 4 is needed, and there is no need to set a high-magnification CCD in the middle and one or two CCDs with relatively lower magnification on the side, so the cost is lower.

[0100] Refer to Figure 5 and Figure 6 , because the vision unit 4 and the vision magnification module 73 are separated in the above settings, if the vision magnification module 73 is directly opened, dust and the like may fall into the vision magnification module 73, thus forming interference tiles in the image and affecting the recognition result. Therefore, the system makes the following settings:

[0101] The vision magnification module 73 includes a structural seat 731, an elastic retaining strip 732, and a cover plate 733. Among them, a vertical light passing hole is formed on the structural seat 731, and a lens is arranged in the light passing hole to achieve the magnification function. One end of the structural seat 731 with a light passing hole is close to the center of the annular plate 71, and the other end extends radially; the cover plate 733 is close to the upper part of the structural seat 731 and is provided with a middle hole matching the light passing hole. When the vision unit 4 is aligned with the light passing hole of the structural seat 731, the middle hole of the cover plate 733 is synchronously aligned.

[0102] The cover plate 733 is slidably disposed on the structural seat 731, and the sliding direction is parallel to the driving direction of the linear transmission unit 5. Two limit blocks 734 are fixed at the bottom of the cover plate 733, and the length direction of the two limit blocks 734 is transversely perpendicular to the sliding direction of the cover plate 733. The arrangement direction of the two limit blocks 734 is parallel to the length direction of the limit blocks 734, and the two limit blocks 734 can be staggered or collinear. A stop block 1 735 and a stop block 2 736 are formed on the upper part of the structural seat 731. The stop block 1 735 is located on the side of the light hole away from the center of the ring plate 71, and the stop block 2 736 is located on the side of the stop block 1 735 away from the light hole.

[0103] The elastic stop strip 732 is fixed to the upper part of the cover plate 733 and the upper side edge of the elastic stop strip 732 is rounded. The elastic stop strip 732 can be a rubber strip. The visual unit 4 is located above the cover plate 733 and the lower edge is lower than the upper edge of the elastic stop strip 732.

[0104] During use, if the visual unit 4 is aligned with the light hole, the side of the visual unit 4 away from the center of the ring plate 71 is close to the side of the elastic baffle 732 facing the center of the ring plate 71, and the side of the stop block 735 away from the center of the ring plate 71 is in contact with the side wall of a limit block 734.

[0105] If the visual unit 4 is located on the side of the structural seat 731 away from the center of the ring plate 71, the visual unit 4 is located on the side of the elastic baffle 732 away from the center of the ring plate 71, and the other limit block 734 is in contact with the stop block 2 736 toward the side of the center of the ring plate 71, then the cover plate 733 blocks the same light hole.

[0106] That is, the visual unit 4 can push the cover plate 733 to move on the structural seat 731 by resisting the elastic baffle 732 while being driven by the linear transmission unit 5; at the same time, it can stop moving in two states under the prevention of stop block 1 735 and stop block 2 736, one state is that the cover plate 733 does not block the light-through hole, and the other state is that the cover plate 733 blocks the light-through hole; because the lower edge of the visual unit 4 can squeeze the elastic baffle 732 to pass over when the cover plate 733 is blocked and cannot move, the above-mentioned function does not require the stop block 1 735 and stop block 2 736 to move.

[0107] Reference Figure 6 The two sides of the structural seat 731 extend upward to form side plates, and the cover plate 733 is located between the two side plates to serve as a limiting guide.

[0108] The embodiments of the present application also disclose a process for monitoring the warp and weft shrinkage of electronic-grade glass fiber cloth.

[0109] The warp and weft shrinkage monitoring process of the electronic-grade fiberglass cloth is implemented by applying the electronic-grade fiberglass cloth warp and weft shrinkage monitoring method as described above in the electronic-grade fiberglass cloth warp and weft shrinkage monitoring system as described in any of the above.

[0110] In summary, this application can reduce the warping of the PCB board substrate and has a relatively low implementation cost.

[0111] The above are all preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A method for monitoring the warp and weft shrinkage of an electronic-grade fiberglass cloth, characterized in that, Including: S1. Establish an open - fiber database, which includes: Recording the warp density n and weft density m during the open - fiber treatment; where n and m are integers and the units include roots / inch and roots / cm; Obtaining the widths of the warp and weft after the open - fiber treatment, and recording them one - by - one according to the corresponding warp density n and weft density m to obtain the first relationship data; Storing the first relationship data in a preset open - fiber database; S2. Shrinkage characteristic analysis, which includes: Obtaining the current warp density n1, weft density m1, and fabric width; Searching the open - fiber database based on n1 and m1 to obtain the matching first relationship data; Obtaining the warp - weft distribution parameters after open - fiber according to the first relationship data and the fabric width; Calculating the similarity in the warp and weft directions, and integrating the first relationship data as monitoring data for output.

2. An electronic-grade fiberglass cloth warp and weft shrinkage monitoring system, characterized in that, Including: A warp - weft parameter acquisition module, which is at least used to obtain the current warp density n1, weft density m1, and width; A control module (1), which is electrically connected to the warp - weft parameter acquisition module; Wherein, the control module (1) is configured as: Searching a preset open - fiber database based on the current warp density n1 and weft density m1 to obtain the matching first relationship data; where the first relationship data includes the widths of the warp and weft during the open - fiber treatment with warp density n and weft density m, n1 ∈ n, m1 ∈ m; Obtaining the warp - weft distribution parameters after open - fiber according to the first relationship data and the fabric width; Calculating the similarity in the warp and weft directions; If the similarity does not meet the preset consistency condition, generating a board bending and warping prompt.

3. The warp and weft shrinkage monitoring system for electronic-grade fiberglass cloth according to claim 2, wherein: The warp - weft parameter acquisition module includes a fiber - passing detection board (2), and the fiber - passing detection board (2) includes a frame (21), a limiting ring (22), a traction wire (23), and a first inductor (24); The frame (21) is provided with a detection cavity, and there are multiple limiting rings (22) suspended in the detection cavity. Any one of the limiting rings (22) is connected to at least three traction wires (23). The multiple traction wires (23) on the same limiting ring (22) are evenly distributed around the limiting ring (22). The end of the traction wire (23) away from the limiting ring (22) is movably connected to the frame (21). The first inductor (24) is installed on the frame (21) and is used to sense the movement of each traction wire (23). The limiting ring (22) is used for the warp and weft to be woven into fabric to pass through; The first inductor (24) is electrically connected to the control module (1), and the control module (1) is configured as: judging whether there are warp and weft passing through the limiting ring (22) according to the feedback of the first inductor (24), and statistically obtaining n1 and m1.

4. The warp and weft shrinkage monitoring system for electronic grade fiberglass cloth according to claim 3, wherein: The frame (21) is provided with a connection hole (211). One end of the traction wire (23) far from the limiting ring (22) is fixed with a conductive block (25). The conductive block (25) is slidably connected to the connection hole (211). The first inductor (24) includes a positive conductive ring (241) and a negative conductive ring (242). The positive conductive ring (241) is fixed to the outer edge of the connection hole (211). The negative conductive ring (242) is located inside the connection hole (211), passed through by the traction wire (23) and fixed to the conductive block (25). The negative conductive rings (242) connected to the conductive blocks (25) on multiple traction wires (23) connected to the same limiting ring (22) are separated from the corresponding positive conductive rings (241). The positive conductive ring (241) and the negative conductive ring (242) are electrically connected to the control module (1).

5. The warp and weft shrinkage monitoring system for electronic-grade fiberglass cloth according to claim 2, wherein: The warp and weft density acquisition module further includes a developing detection table. The developing detection table includes a table body (3), a vision unit (4) and a linear drive unit (5). An installation groove (32) is recessed in the table body (3). An anti-color pad (33) is laid in the installation groove (32). Different-color strips are arranged on the anti-color pad (33). Multiple different-color strips form a group, and the colors and lengths of the different-color strips in the same group are different. Multiple groups of different-color strips are arranged along the direction perpendicular to the direction in which the fiberglass cloth passes over the table body (3). A transparent top plate is embedded in the installation groove (32), and the transparent top plate covers the anti-color pad (33). The vision unit (4) is located above the table body (3) with the lens facing downwards. The linear drive unit (5) is used to drive the vision unit (4) to move. The linear drive unit (5) can at least drive the vision unit (4) along the distribution direction of multiple different-color strips. The vision unit (4) and the linear drive unit (5) are respectively connected to the control module (1).

6. The warp and weft shrinkage monitoring system for electronic-grade fiberglass cloth according to claim 5, characterized in that: A light homogenizing light source (6) is arranged in the installation groove (32). The anti-color pad (33) is provided with openings corresponding to the light homogenizing light source (6). The light homogenizing light source (6) is electrically connected to the control module (1). The control module (1) is configured to: acquire an image of the fabric directly above the light homogenizing light source (6) and obtain the warp density n1 and the weft density m1 based on the image, and adjust the warp and weft distribution parameters after fiber opening.

7. The warp and weft shrinkage monitoring system for electronic-grade fiberglass cloth according to claim 6, characterized in that: It further includes a vision moving mechanism (7). The vision moving mechanism (7) includes an annular plate (71), a rotating frame (72) and a vision magnification module (73). The rotating frame (72) is rotatably connected above the table body (3). Above the table body (3), a reduction motor (74) for driving the rotating frame (72) to rotate and a second inductor (8) for detecting the rotation amount are installed. The reduction motor (74) and the second inductor (8) are electrically connected to the control module (1). The annular plate (71) is fixed to the lower part of the rotating frame (72). The linear drive unit (5) is installed on the annular plate (71) and the driving direction is the radial direction of the annular plate (71). The vision unit (4) is fixed to the driving part of the linear drive unit (5). A vision magnification module (73) is arranged below the vision unit (4). The vision magnification module (73) is located directly above the light homogenizing light source (6) and is fixed to the annular plate (71).

8. The warp and weft shrinkage monitoring system for electronic-grade fiberglass cloth according to claim 7, characterized in that: The vision magnification module (73) includes a structure base (731), elastic stop strips (732) and a cover plate (733). A vertical light passing hole is arranged on the structure base (731), and a lens for magnification is arranged in the light passing hole; The cover plate (733) is close to the upper part of the structure base (731) and is provided with a middle hole matching the light passing hole. The cover plate (733) is slidably connected to the structure base (731) and the sliding direction is parallel to the driving direction of the linear drive unit (5); Two limit blocks (734) are fixed to the bottom of the cover plate (733). The length direction of the two limit blocks (734) is horizontally perpendicular to the sliding direction of the cover plate (733), and the distribution direction of the two limit blocks (734) is parallel to the length direction of the limit blocks (734); A first stop block (735) and a second stop block (736) are fixed to the upper part of the structure base (731). The first stop block (735) is located on the side of the light passing hole away from the center of the annular plate (71), and the second stop block (736) is located on the side of the first stop block (735) away from the light passing hole; The elastic stop strips (732) are fixed to the upper part of the cover plate (733). The vision unit (4) is located above the cover plate (733) and the lower edge is higher than the upper edge of the elastic stop strips (732); If the vision unit (4) is aligned with the light passing hole, the middle hole is synchronously aligned, and the side of the vision unit (4) away from the center of the annular plate (71) is close to the side of the elastic stop strips (732) facing the center of the annular plate (71). The side of the first stop block (735) facing away from the center of the annular plate (71) fits against the side wall of a limit block (734); If the vision unit (4) is located on the side of the structure base (731) away from the center of the annular plate (71), the vision unit (4) is located on the side of the elastic stop strips (732) away from the center of the annular plate (71). The other limit block (734) fits against the side of the second stop block (736) facing the center of the annular plate (71), and the cover plate (733) blocks the light passing hole.

9. An electronic-grade fiberglass cloth warp and weft shrinkage monitoring process, characterized in that: Implement the warp and weft shrinkage monitoring method of the electronic glass fiber cloth as claimed in claim 1 by applying the warp and weft shrinkage monitoring system of the electronic glass fiber cloth as claimed in any one of claims 2-8.

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