Electronic grade glass fiber cloth warp and weft shrinkage monitoring method, system and process thereof

Abstract

The invention discloses an electronic-grade glass fiber cloth warp and weft shrinkage monitoring method, system and process, and relates to the technical field of glass fiber cloth production and processing.The electronic-grade glass fiber cloth warp and weft shrinkage monitoring method comprises the steps that S1, a splitting database is established, specifically, the warp density n and the weft density m for splitting treatment are recorded; the widths of the warp yarn and the weft yarn after splitting treatment are obtained, and first relational data are obtained according to one-to-one recording of the corresponding warp yarn density n and the weft yarn density m; the first relational data is stored in a preset splitting database; s2, shrinkage characteristic analysis: acquiring the current warp yarn density n1, the current weft yarn density m1 and the current cloth width; searching a splitting database based on n1 and m1 to obtain matched relational data I; obtaining warp and weft distribution parameters after splitting according to the relational data I and the cloth width; and calculating the similarity in the warp direction and the weft direction, and integrating the relational data I as monitoring data to be output. The PCB substrate has the effect of reducing warping of the PCB substrate.

Description

Technical Field

[0001] The present application relates to the technical field of glass fiber cloth production and processing, and in particular 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 main raw materials for making circuit boards. Glass fiber cloth and resin are combined to obtain a film, which is then hot-pressed with a copper plate to obtain a PCB substrate.

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

[0004] Electronic grade glass fiber cloth is used as the base material of reinforced composite materials. The orientation of glass fiber in the flow direction will limit the shrinkage of resin. If the longitudinal shrinkage of the product is smaller than the lateral shrinkage, this uneven shrinkage will cause 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 a PCB substrate, the present application provides a method, system and process for monitoring the warp and weft shrinkage of an electronic-grade glass fiber cloth.

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

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

[0008] S1. Establishing a fiber opening database, which includes:

[0009] Record the warp yarn density n and weft yarn density m for fiber opening treatment; n and m are integers and the units include roots / inch and roots / cm;

[0010] Obtain the widths of the warp yarn and the weft yarn after the fiber opening process, and record them one by one according to the corresponding warp yarn density n and weft yarn density m to obtain relation data 1;

[0011] Relationship data one is stored in a preset fiber opening database;

[0012] S2. Shrinkage characteristics analysis, including:

[0013] Get the current warp density n1, weft density m1 and fabric width;

[0014] Search the fiber opening database based on n1 and m1 to obtain matching relation data 1;

[0015] According to the relationship data 1 and the cloth width, the warp and weft distribution parameters after fiber opening are obtained;

[0016] Calculate the similarity in longitude and latitude, and integrate the relationship data as monitoring data output.

[0017] In a second aspect, the present application provides a system for monitoring the warp and weft shrinkage of electronic-grade glass fiber cloth, which adopts the following technical solution:

[0018] An electronic grade glass fiber cloth warp and weft shrinkage monitoring system, comprising:

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

[0020] A control module, which is electrically connected to the longitude and latitude parameter acquisition module;

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

[0022] Based on the current warp yarn density n1 and weft yarn density m1, a preset fiber opening database is searched to obtain matching relational data 1; wherein the relational data 1 includes the widths of the warp yarn and the weft yarn during fiber opening when the warp yarn density is n and the weft yarn density is m, n1∈n, m1∈m;

[0023] According to the relationship data 1 and the cloth width, the warp and weft distribution parameters after fiber opening are obtained;

[0024] Calculate the similarity in longitude and latitude;

[0025] If the similarity does not meet the preset consistency condition, a plate bending and warping prompt is generated.

[0026] Optionally, the longitude and latitude parameter acquisition module unit includes a fiber detection board, and the fiber detection board includes a frame, a restriction ring, a traction line and a sensor;

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

[0028] The sensor 1 is electrically connected to the control module, and the control module is configured to: determine whether warp yarns and weft yarns pass through the limiting loop according to the feedback of the sensor 1, and obtain n1 and m1 by statistics.

[0029] Optionally, the frame is provided with a connecting hole, a conductive block is fixed at one end of the traction line away from the limiting ring, the conductive block is slidably connected to the connecting hole, the sensor comprises a positive conductive ring and a pair of conductive rings, the positive conductive ring is fixed to the outer end edge of the connecting hole, the pair of conductive rings is located in the connecting hole and is passed through by the traction line and fixed to the conductive block; the pair of conductive rings connected to the conductive blocks on the multiple traction lines connected to the same limiting ring are separated from the corresponding positive conductive rings, and the positive conductive rings and pair of conductive rings are electrically connected to the control module.

[0030] Optionally, the longitude and latitude density acquisition module further includes a development detection table, the development detection table includes a table body, a visual unit and a linear transmission unit, the table body is concavely formed with a mounting groove, a color-reflecting pad is laid in the mounting groove, and different-color strips are arranged on the color-reflecting pad, and the different-color strips are grouped in a plurality and the colors and lengths of the different-color strips in the same group are different, and the plurality of groups of different-color strips are arranged along a direction perpendicular to the direction in which the glass fiber cloth passes through the table body, and a transparent top plate is embedded in the mounting groove, and the transparent top plate covers the color-reflecting pad;

[0031] The visual unit is located above the platform with the lens facing downward, and the linear transmission unit is used to drive the visual unit to move, and the linear transmission unit can at least drive the visual unit along the distribution direction of multiple heterochromatic strips;

[0032] The visual unit and the linear transmission unit are respectively connected to the control module.

[0033] Optionally, a uniform light source is provided in the installation groove, a hole is opened on the anti-color pad corresponding to the uniform light source, the uniform light source is electrically connected to the control module, and the control module is configured to: obtain an image of the fabric directly above the uniform light source and obtain the warp yarn density n1 and the weft yarn density m1 based on the image, and adjust the warp and weft distribution parameters after fiber opening.

[0034] Optionally, it further includes a visual activity mechanism, which includes a ring plate, a rotating frame and a visual magnification module, the rotating frame is rotatably connected to the top of the platform, a reduction motor for driving the rotating frame to rotate and a second sensor for detecting the rotation amount are installed on the top of the platform, and the reduction motor and the second sensor are electrically connected to the control module;

[0035] The ring plate is fixed to the lower part of the rotating frame, the linear transmission unit is installed on the ring plate and the driving direction is the radial direction of the ring plate, the visual unit is fixed to the driving part of the linear transmission unit, and a visual amplification module is arranged below the visual unit. The visual amplification module is located directly above the uniform light source and is fixed to the ring plate.

[0036] Optionally, the visual amplification module comprises a structural seat, an elastic baffle and a cover plate, the structural seat is provided with a vertical light-through hole, and a transparent material for amplification is built into the light-through hole;

[0037] The cover plate is close to the upper part of the structure seat and is provided with a middle hole matching the light-through hole. The cover plate is slidably connected to the structure seat and the sliding direction is parallel to the driving direction of the linear transmission unit. Two limit blocks are fixed to the bottom of the cover plate. The length directions of the two limit blocks are transversely perpendicular to the sliding direction of the cover plate, and the distribution directions of the two limit blocks are parallel to the length directions of the limit blocks.

[0038] A stop block 1 and a stop block 2 are fixed on the upper part of the structural seat, wherein the stop block 1 is located on a side of the light-through hole away from the center of the ring plate, and the stop block 2 is located on a side of the stop block 1 away from the light-through hole;

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

[0040] If the visual unit is aligned with the light-through hole, the middle hole is aligned synchronously, and the side of the visual unit away from the center of the ring plate is close to the side of the elastic baffle toward the center of the ring plate, and the side of the stop block away from the center of the ring 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 seat away from the center of the ring plate, the visual unit is located on the side of the elastic baffle away from the center of the ring plate, the other limit block is in contact with the side of the stop block 2 facing the center of the ring plate, and the cover plate blocks the light hole.

[0042] In a third aspect, the present application provides a process for monitoring the warp and weft shrinkage of electronic-grade glass fiber cloth, which adopts the following technical solution:

[0043] A process for monitoring the warp and weft shrinkage of electronic-grade glass fiber cloth is disclosed, wherein the warp and weft shrinkage monitoring system for electronic-grade glass fiber cloth as described above is used to implement the warp and weft shrinkage monitoring method for electronic-grade glass fiber cloth.

[0044] In summary, the present application includes the following beneficial technical effects: the similarities in the calculated warp and weft directions of the glass fiber cloth can be analyzed to provide prompts to the staff, so as to guide the staff to adjust the warp and weft density when weaving the glass fiber cloth, or adjust the fiber opening equipment to change the width of the warp and weft yarns after fiber opening, so that the glass fiber cloth and resin can achieve the most consistent shrinkage rates in the longitudinal and transverse directions during injection molding, thereby reducing the warping of the board. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the main process of the method of the present application;

[0046] Figure 2It is a partial longitudinal cross-sectional structural schematic diagram 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 development and detection station of the system of the present application;

[0048] Figure 4 It is a control structure diagram 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 transmission unit and the visual unit of the present application;

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

[0051] Explanation of the reference numerals: 1. control module; 2. fiber detection board; 21. frame; 211. connection hole; 22. limiting ring; 23. traction line; 24. sensor 1; 241. conductive ring positive; 242. conductive ring pair; 25. conductive block; 3. table; 31. guide roller; 32. mounting groove; 33. anti-color pad; 4. visual unit; 5. linear transmission unit; 6. uniform light source; 7. visual activity mechanism; 71. ring plate; 72. rotating frame; 73. visual magnification module; 731. structural seat; 732. elastic baffle; 733. cover plate; 734. limit block; 735. stop block 1; 736. stop block 2; 74. reduction motor; 8. sensor 2. DETAILED DESCRIPTION

[0052] The following is combined with Figure 1-6 This application is described in further detail.

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

[0054] Reference Figure 1 The methods for monitoring the warp and weft shrinkage of electronic grade glass fiber cloth include:

[0055] S1. Establishing a fiber opening database;

[0056] S2. Analysis of shrinkage characteristics.

[0057] It is understandable that for glass fiber cloth, in order to ensure the wettability of resin more quickly, the glass fiber cloth needs to be thinned and uniformed. Currently, the glass fiber cloth is subjected to fiber opening treatment to achieve the above two goals. Therefore, this method monitors and analyzes the warp and weft shrinkage of the glass fiber cloth through the number of warp yarns and weft yarns used in warp knitting and the changes after fiber opening, so as to achieve the most consistent shrinkage rate as possible between the longitudinal and transverse directions of the glass fiber cloth and the resin during injection molding, thereby reducing the warping of the board.

[0058] The details are explained below.

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

[0060] Record the warp yarn density n and weft yarn density m for fiber opening treatment; n and m are integers and the units include roots / inch and roots / cm;

[0061] Get the width of the warp and weft yarns after the fiber opening process, and record them one by one according to the corresponding warp density n and weft density m to obtain relationship data 1; example: warp yarn 44 strands / inch, weft yarn 34 strands / inch, warp yarn width d1mm, weft yarn d2mm;

[0062] The relational data is stored in a preset fiber opening database.

[0063] It is understandable that the staff can weave cloth into cloth in advance with the warp and weft combinations available on the market, and send them to the fiber opening equipment for processing to obtain a fiber opening database with relatively rich data; if necessary, an empirical mathematical relationship (mathematical formula) between the warp and weft density and the warp and weft width can be established based on the data in the fiber opening database.

[0064] S2. Real-time monitoring and analysis, which includes:

[0065] Get the current warp density n1, weft density m1 and cloth width; it should be noted that the current here includes: glass fiber warp knitted fabric and glass fiber fabric before fiber opening; the cloth width refers to the distance between the leftmost and rightmost warp yarns of the cloth. It can be understood that the length of the weft yarn of the cloth is slightly larger than the warp yarn on the side to prevent derailment;

[0066] Search the fiber opening database based on n1 and m1 to obtain matching relation data 1;

[0067] According to the relation data 1 and the cloth width, the warp and weft distribution parameters after fiber opening are obtained; specifically: starting from the weft direction, an example is given: (d1*44+d2*34)=1inch, cloth width / 1inch=number of cycles Y; assuming that the warp and weft yarns are alternating, then: d1, d2, ... until all 44 d1s, 34 d2s are one cycle, if Y is an integer, repeat Y times; if Y is a non-integer, repeat Y1 times to get the integer obtained after removing the non-decimal from Y, and add a decimal to divide the cycle;

[0068] Calculate the similarity in longitude and latitude, and integrate the relationship data as monitoring data output.

[0069] An example of similarity calculation is as follows: the sum of the widths of the warps is calculated as one, the sum of the widths of the wefts is calculated as two, and the similarity is obtained by comparison.

[0070] According to the above settings, the staff adjusts the warp and weft density of the glass fiber cloth during weaving, or adjusts the fiber opening equipment to change the width of the warp and weft yarns after fiber opening, so that the glass fiber cloth and resin can achieve the most consistent shrinkage rate in the longitudinal and transverse directions during injection molding, thereby reducing the warping of the board.

[0071] It is understandable that, in the above similarity analysis, it is more accurate to add the gaps between the warp yarns and the weft yarns. Therefore, in another embodiment of the present application, a unit area is sampled from the fabric, the warp and weft distribution parameters in the unit area are obtained, the number of unit areas is calculated, and then the overall warp and weft distribution parameters are obtained, rather than directly using density units (roots / inch) to obtain the warp and weft distribution parameters in a unit and then analyzing the warp and weft distribution parameters.

[0072] The embodiment of the present application also discloses a system for monitoring the warp and weft shrinkage of electronic-grade glass fiber cloth.

[0073] Reference Figure 2-4 The electronic-grade glass fiber cloth warp and weft shrinkage monitoring system includes: a warp and weft parameter acquisition module and a control module 1, wherein 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 follows:

[0074] Based on the current warp yarn density n1 and weft yarn density m1, a preset fiber opening database is searched to obtain matching relational data 1; wherein the relational data 1 includes the widths of the warp yarn and the weft yarn during fiber opening when the warp yarn density is n and the weft yarn density is m, n1∈n, m1∈m;

[0075] According to the relationship data 1, the warp width distribution parameters and the weft width distribution parameters after fiber opening are obtained;

[0076] Calculate the similarity of the longitudinal width distribution parameters and the latitudinal width distribution parameters;

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

[0078] The data analysis of the control module 1 has been described in the aforementioned embodiment of the method, so it will not be repeated here. The other contents will be described below.

[0079] Reference Figure 2In one embodiment of the system, the longitude and latitude parameter acquisition module includes a fiber detection board 2, and the fiber detection board 2 includes a frame 21, a restriction ring 22, a traction line 23 and a sensor 24. The frame 21 is a rectangular or circular frame structure when viewed from the front. In this embodiment, a rectangle is used as an example. A detection cavity is formed in the frame 21, and there are multiple restriction rings 22 that are suspended and distributed in the detection cavity; any restriction ring 22 is connected to at least three traction lines 23, and this embodiment is described by taking three as an example.

[0080] The three traction lines 23 on the same limiting ring 22 are evenly distributed around the limiting ring 22, and one end of the traction line 23 away from the limiting ring 22 is movably connected to the frame. The sensor 1 24 is installed on the frame 21 and is used to sense the movement of each traction line 23. The fiber travel detection board 2 is installed on the feeding path of a warp knitting device, and each warp yarn and weft yarn passes through the limiting ring 22 respectively.

[0081] The sensor 1 24 is electrically connected to the control module 1, and the control module is configured to: determine whether warp yarns and weft yarns pass through the limiting ring 22 based on the feedback of the sensor 1 24, and obtain n1 and m1 by counting; that is, when a limiting ring 22 is activated due to the passage of warp yarns and weft yarns, it is detected by the sensor 1 24, and the control module 1 can obtain corresponding data by corresponding counting.

[0082] According to the above settings, the system can use the fiber detection board 2 to quickly detect the number of warps and wefts of the glass fiber cloth to be woven, and use this to calculate the warp and weft density, providing a basis for the control module 1 to analyze the warp and weft similarity (warp and weft contraction).

[0083] Reference Figure 2 The frame 21 is provided with a connection hole 211, and a conductive block 25 is fixed at one end of the traction line 23 away from the limiting ring 22, and the conductive block 25 is slidably connected to the connection hole. The sensor 1 24 includes a conductive ring 241 and a conductive ring pair 242, the conductive ring 241 is fixed to the outer edge of the connection hole, and the conductive ring pair 242 is located in the connection hole and is passed through by the traction line 23 and fixed to the conductive block 25. The conductive ring pair 242 connected to the conductive blocks 25 on multiple traction lines 23 connected to the same limiting ring 22 is separated from the corresponding conductive ring 241, such as: one traction line 23 is vertical, and the conductive ring 241 and the conductive ring pair 242 corresponding to the traction line 23 conflict with each other, while the other two traction lines 23 extend obliquely toward both sides and the corresponding conductive ring 241 and the conductive ring pair 242 conflict with each other.

[0084] When the warp yarn and weft yarn pass through it, as long as the position of the frame 21 is reasonably arranged so that the working warp yarn and weft yarn of the weaving equipment can pull the limiting ring 22 sideways, it is only necessary to connect the conductive ring positive 241 and the conductive ring auxiliary 242 to the signal int terminal and out terminal of the control module 1 with wires, and it can be judged whether the warp yarn and weft yarn pass through the limiting ring 22 by whether there is a level signal feedback.

[0085] The above arrangement is relatively simple in structure and low in cost.

[0086] It is understandable that the above content can be used to provide reference and guidance for the staff when weaving glass fiber cloth. Considering that some manufacturers do not involve the processing of weaving cloth, they only do the subsequent fiber opening and substrate production, and directly purchase the cloth, so the warp and weft parameter collection module also includes: the development detection table, reference Figure 3-5 The development and detection platform includes a platform body 3, a visual unit 4 and a linear transmission unit 5.

[0087] The table 3 is installed on the feeding path of the glass fiber cloth, that is, the glass fiber cloth is fed against its upper table surface. For this purpose, two guide rollers 31 can be installed on the table 3 using a bearing seat. The glass fiber cloth passes through the bottom of the guide rollers 31 and moves from one guide roller 31 to another guide roller 31.

[0088] The platform 3 is concavely formed with a mounting groove 32, which is located between the two guide rollers 31. A color-reversing pad 33 is laid in the mounting groove 32. The color-reversing pad 33 can be black and has different-color strips painted on it with paint. The different-color strips are grouped in groups, and the colors and lengths of the different-color strips in the same group are different. The multiple groups of different-color strips are arranged in a direction perpendicular to the direction in which the glass fiber cloth passes through the platform 3. A transparent top plate is embedded in the mounting groove 32, and the transparent top plate covers the color-reversing pad 33.

[0089] The purpose of setting the different color strips is to more clearly identify and locate the edge of the fabric 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, for example: the position of a different color strip at the end represents the zero point, and so on.

[0090] Reference Figure 5 The visual unit 4 is located above the platform 3 and the lens is facing downward. The linear transmission unit 5 is used to drive the visual unit 4 to move horizontally, and the linear transmission unit 5 can at least drive the visual unit 4 to move along the distribution direction of the multiple different color strips. The visual unit 4 and the linear transmission 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 transmission unit 5 to drive the visual unit 4 to move above the edge of the fabric, collect images with the visual unit 4, and then identify which different-color stripe the edge of the fabric is aligned with through image feature recognition, so as to find the pre-stored different-color stripe-position data table to calculate the width of the fabric; secondly, the warp yarn and weft yarn can be identified through image feature recognition, and the number, width and distribution pattern of the warp and weft in the field of view can be obtained through processing, and because the warp and weft distribution pattern at this time is actually obtained, rather than analyzed in a preset fixed manner (such as alternating analysis) as described in the aforementioned method, more accurate warp and weft distribution parameters can be obtained, that is, in addition to obtaining the warp and weft density based on the image, the warp and weft distribution parameters after fiber opening are adjusted according to the actual feature performance.

[0092] The above-mentioned visual recognition features, visual measurement dimensions, and visual counting are all existing technologies, so they are not repeated here. The process example is: image preprocessing, feature positioning, contour extraction, recognition, distance change, feature contour counting, calculating pixel size and converting it to the actual size using a scale.

[0093] Reference Figure 3 In another embodiment of the system, in order to reduce the interference caused by the border of the fabric, different color strips, etc., the image of the number, width, and distribution of the warp and weft needs to be re-photographed, and the shooting position can be the middle of the platform 3. Furthermore, in order to make the recognition accuracy of the warp and weft characteristics higher, a uniform light source 6 is embedded in the center of the above-mentioned installation groove 32, and a corresponding hole is opened on the anti-color pad 33; the visual unit 4 shoots the fabric directly above the uniform light source.

[0094] The uniform light source 6 is electrically connected to the control module 1 through the relay switch signal port for automatic opening and closing optimization; when turned on, the visual unit 4 is located directly above and collects images, and 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] Reference Figure 3-5 In another embodiment of the system, it further includes a visual activity mechanism 7, which includes a ring plate 71, a rotating frame 72 and a visual magnification module 73.

[0096] A rotating shaft is formed on the upper part of the rotating frame 72, and the rotating shaft is rotatably connected to a beam structure of a gantry frame spanning above the platform 3, and a reduction motor 74 is installed on the beam; a sensor 28 is also installed on the beam, and the sensor 28 can be a rotary encoder, a coaxial fixed rotating shaft or an output shaft of the reduction motor, and the reduction motor 74 and the sensor 28 are electrically connected to the control module 1 respectively, and the control module 1 can be a PLC controller and an industrial host electrically connected to the PLC controller.

[0097] The ring plate 71 is fixed to the lower part of the rotating frame 72 through a radially extending inner frame. The above-mentioned linear transmission unit 5 can be a linear motor and is fixed to the ring plate 71. The slider of the linear motor is installed with the visual unit 4. The visual magnification module 73 is fixed to the lower part of the ring plate 71 with a connecting rod, and is located directly below the position of the visual unit 4 when shooting the uniform light source 6 area. The visual magnification module 73 can be a light-proof structure with a vertical light hole. Multiple lenses are fixed from top to bottom in the light hole. The specific size of the lens is determined according to the magnification required on site, and the magnification can be 30 times.

[0098] When in use, if you want to switch from capturing images from the fabric boundary to capturing images from the center, you only need to control module 1 to output movement control parameters to control the linear transmission unit 5 to drive the visual unit 4 to move to an area close to the center of the ring plate 71; when it is necessary to locate the boundary of the fabric to calculate the width of the fabric, the visual unit 4 does not need to move, and you only need to control module 1 to output rotation control parameters to control the reduction motor 74 to drive the rotating frame 72 to rotate 180° to quickly allow the visual unit 4 to reach the approximate position.

[0099] According to the above configuration, the system has the following effects: only one visual unit 4 is needed, and there is no need to set a high-magnification CCD in the middle and one or two relatively low-magnification CCDs on the sides, so the cost is lower.

[0100] Reference Figure 5 and Figure 6 , because the above-mentioned setting of the visual unit 4 and the visual magnification module 73 is separated, if the visual magnification module 73 is directly opened, dust or the like may fall into the visual magnification module 73, thereby forming interference blocks in the image and affecting the recognition result, so the system makes the following settings:

[0101] The visual magnification module 73 includes a structural seat 731, an elastic baffle 732 and a cover plate 733, wherein a vertical light-through hole is formed on the structural seat 731 and a lens is built into the light-through hole to realize a magnification function. One end of the structural seat 731 with the light-through hole is close to the center of the ring 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-through hole. When the visual unit 4 is aligned with the light-through 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 electronic-grade glass fiber cloth warp and weft shrinkage monitoring process uses any of the electronic-grade glass fiber cloth warp and weft shrinkage monitoring systems described above to implement the electronic-grade glass fiber cloth warp and weft shrinkage monitoring method described above.

[0110] In summary, the present application can reduce the warping of the PCB substrate, and the implementation cost is relatively low.

[0111] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for monitoring the warp and weft shrinkage of electronic grade glass fiber cloth, characterized in that: include: S1. Establishing a fiber opening database, which includes: Record the warp yarn density n and weft yarn density m for fiber opening treatment; n and m are integers and the units include roots / inch and roots / cm; Obtain the widths of the warp yarn and the weft yarn after the fiber opening process, and record them one by one according to the corresponding warp yarn density n and weft yarn density m to obtain relation data 1; Relationship data one is stored in a preset fiber opening database; S2. Shrinkage characteristics analysis, including: Get the current warp density n1, weft density m1 and fabric width; Search the fiber opening database based on n1 and m1 to obtain matching relation data 1; According to the relationship data 1 and the cloth width, the warp and weft distribution parameters after fiber opening are obtained; Calculate the similarity in longitude and latitude, and integrate the relationship data as monitoring data output.

2. An electronic grade glass fiber cloth warp and weft shrinkage monitoring system, characterized in that: include: A warp and weft parameter acquisition module, which is used to obtain at least the current warp density n1, weft density m1 and width; A control module (1), which is electrically connected to the longitude and latitude parameter acquisition module; Wherein, the control module (1) is configured as follows: Based on the current warp yarn density n1 and weft yarn density m1, a preset fiber opening database is searched to obtain matching relational data 1; wherein the relational data 1 includes the widths of the warp yarn and the weft yarn during fiber opening when the warp yarn density is n and the weft yarn density is m, n1∈n, m1∈m; According to the relationship data 1 and the cloth width, the warp and weft distribution parameters after fiber opening are obtained; Calculate the similarity in longitude and latitude; If the similarity does not meet the preset consistency condition, a plate bending and warping prompt is generated.

3. The electronic grade glass fiber cloth warp and weft shrinkage monitoring system according to claim 2, characterized in that: The longitude and latitude parameter acquisition module unit comprises a fiber-path detection board (2), and the fiber-path detection board (2) comprises a frame (21), a restriction ring (22), a traction line (23) and a sensor 1 (24); The frame (21) is provided with a detection cavity, the limiting rings (22) are multiple and suspended in the detection cavity, any one of the limiting rings (22) is connected to at least three traction lines (23), the multiple traction lines (23) on the same limiting ring (22) are evenly distributed around the limiting ring (22), one end of the traction line (23) away from the limiting ring (22) is movably connected to the frame (21), the sensor (24) is installed on the frame (21) and is used to sense the movement of each traction line (23), and the limiting ring (22) is used for the warp yarn and weft yarn to be woven into cloth to pass through; The sensor 1 (24) is electrically connected to the control module (1), and the control module (1) is configured to determine whether warp yarns and weft yarns pass through the limiting loop (22) based on feedback from the sensor 1 (24), and obtain n1 and m1 by statistics.

4. The electronic grade glass fiber cloth warp and weft shrinkage monitoring system according to claim 3, characterized in that: The frame (21) is provided with a connection hole (211); a conductive block (25) is fixed to one end of the traction line (23) away from the limiting ring (22); the conductive block (25) is slidably connected to the connection hole (211); the sensor (24) comprises a positive conductive ring (241) and a pair of conductive rings (242); the positive conductive ring (241) is fixed to the outer edge of the connection hole (211); the pair of conductive rings (242) is located in the connection hole (211), is passed through by the traction line (23) and is fixed to the conductive block (25); the pair of conductive rings (242) connected to the conductive blocks (25) on the multiple traction lines (23) connected to the same limiting ring (22) are separated from the corresponding positive conductive rings (241); the positive conductive rings (241) and the pair of conductive rings (242) are electrically connected to the control module (1).

5. The electronic grade glass fiber cloth warp and weft shrinkage monitoring system according to claim 2, characterized in that: The warp and weft density acquisition module also includes a developing detection platform, the developing detection platform includes a platform body (3), a visual unit (4) and a linear transmission unit (5), the platform body (3) is concavely formed with a mounting groove (32), a color-reversing pad (33) is laid in the mounting groove (32), and different-color strips are arranged on the color-reversing pad (33), the different-color strips are grouped in a plurality and the different-color strips in the same group have different colors and lengths, and the plurality of groups of different-color strips are arranged in a direction perpendicular to the direction in which the glass fiber cloth passes through the platform body (3), and a transparent top plate is embedded in the mounting groove (32), and the transparent top plate covers the color-reversing pad (33); The visual unit (4) is located above the platform (3) with its lens facing downwards, and the linear transmission unit (5) is used to drive the visual unit (4) to move, and the linear transmission unit (5) can at least drive the visual unit (4) along the distribution direction of the plurality of different-color strips; The visual unit (4) and the linear transmission unit (5) are respectively connected to the control module (1).

6. The electronic grade glass fiber cloth warp and weft shrinkage monitoring system according to claim 5, characterized in that: A uniform light source (6) is arranged in the installation groove (32), a hole is opened on the anti-color pad (33) corresponding to the uniform light source (6), the uniform light source (6) is electrically connected to the control module (1), and the control module (1) is configured to: obtain an image of the fabric directly above the uniform 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 electronic grade glass fiber cloth warp and weft shrinkage monitoring system according to claim 6, characterized in that: The device also includes a visual activity mechanism (7), the visual activity mechanism (7) including a ring plate (71), a rotating frame (72) and a visual magnification module (73), the rotating frame (72) is rotatably connected to the top of the platform (3), a reduction motor (74) for driving the rotating frame (72) to rotate and a second sensor (8) for detecting the amount of rotation are installed on the top of the platform (3), and the reduction motor (74) and the second sensor (8) are electrically connected to the control module (1); The ring plate (71) is fixed to the lower part of the rotating frame (72); the linear transmission unit (5) is mounted on the ring plate (71) and the driving direction is the radial direction of the ring plate (71); the visual unit (4) is fixed to the driving part of the linear transmission unit (5); a visual amplification module (73) is arranged below the visual unit (4); the visual amplification module (73) is located directly above the uniform light source (6) and is fixed to the ring plate (71).

8. The electronic grade glass fiber cloth warp and weft shrinkage monitoring system according to claim 7, characterized in that: The visual amplification module (73) comprises a structural seat (731), an elastic blocking strip (732) and a cover plate (733); a vertical light-through hole is provided on the structural seat (731), and a transparent material for amplification is built into the light-through hole; 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-through hole. The cover plate (733) is slidably connected to 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 to the bottom of the cover plate (733). The length directions of the two limit blocks (734) are transversely perpendicular to the sliding direction of the cover plate (733). The distribution direction of the two limit blocks (734) is parallel to the length direction of the limit blocks (734). A stop block 1 (735) and a stop block 2 (736) are fixed to the upper part of the structural seat (731), wherein the stop block 1 (735) is located on a side of the light-through hole away from the center of the ring plate (71), and the stop block 2 (736) is located on a side of the stop block 1 (735) away from the light-through hole; The elastic blocking strip (732) is fixed to the upper part of the cover plate (733), and the visual unit (4) is located above the cover plate (733) with its lower edge higher than the upper edge of the elastic blocking strip (732); If the visual unit (4) is aligned with the light-through hole, the middle hole is aligned synchronously, and the side of the visual unit (4) away from the center of the ring plate (71) is close to the side of the elastic stop strip (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); If the visual unit (4) is located on a side of the structural seat (731) away from the center of the ring plate (71), the visual unit (4) is located on a side of the elastic blocking strip (732) away from the center of the ring plate (71), another limit block (734) is in contact with the side of the stop block 2 (736) facing the center of the ring plate (71), and the cover plate (733) blocks the light hole.

9. A process for monitoring the warp and weft shrinkage of electronic grade glass fiber cloth, characterized in that: The electronic-grade glass fiber cloth warp and weft shrinkage monitoring system as described in any one of claims 2 to 8 is used to implement the electronic-grade glass fiber cloth warp and weft shrinkage monitoring method as described in claim 1.

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