3372 results about "Screen printing" patented technology

The invention discloses a low-temperature silver-coated copper conductive silver paste suitable for heterojunction solar cell nickel screen printing, which comprises the following components in percentage by mass: 10-70% of spherical silver-coated copper powder, 15-80% of submicron silver powder, 0.5-5% of nano silver powder, 1-6% of resin, 0.2-4% of assistant and 0.5-3% of solvent, wherein the resin comprises epoxy resin with the epoxy equivalent of 200 to 260 and rubber toughened epoxy resin with the weight-average molecular weight of 10000 to 20000. Wherein the epoxy resin with the epoxy equivalent of 200-260 provides ink passing performance, and nickel net narrow line width printing is guaranteed; the high-molecular-weight resin with the weight-average molecular weight of 10000-20000 is used as the thixotropic agent, so that the printing line type and the height-width ratio are ensured. The line width of a heterojunction battery prepared by matching the slurry with nickel net narrow line width printing can be as low as 18 microns, and the conversion efficiency of a battery piece is improved on the basis of greatly reducing the silver consumption of a single piece.

The invention provides an efficient and accurate frequency modulation screen printing color management color matching auxiliary system which comprises a collector, the collector comprises an image collection module, the image collection module can capture a multi-channel filter array of a printing manuscript through a multispectral imaging device, and an analyzer comprises a spectral analysis module and a color matching prediction module. The spectral analysis module is in communication connection with the image acquisition module, after low-dimensional feature vectors are generated, candidate schemes are listed, and the color matching prediction module predicts an ink matching scheme based on the low-dimensional feature vectors and a deep convolutional neural network; relates to the technical field of frequency modulation screen printing toning. According to the method, the limitation of traditional single-factor color matching is broken through by introducing a multi-modal data fusion (spectrum + base material + ambient light) and Bayesian optimization feedback mechanism, the nonlinear mapping problem of high-dimensional spectral data is solved through cooperation of manifold learning dimension reduction and deep neural network prediction, and efficient and accurate frequency modulation network color matching adjustment is realized.

According to the device and method for controlling the connection void rate of the large-area thermal interface of the power electronic device provided by the invention, the device part ensures that an organic solvent and water vapor in a soldering paste layer can be smoothly discharged by optimizing the grid structure shape design of a steel mesh printing module, so that the void rate in the welding process is effectively reduced; according to the method, through optimization of the reflow soldering technology, temperature control and vacuum degree optimization of all stages such as the heating process, the heat preservation process, the pre-reflow process and the reflow process are included, the gas escape time is properly prolonged, the voidage is controlled to be 1% or below, the interface thermal resistance is reduced, and the heat dissipation performance is improved. Through optimization design and process, the production process is simplified, the operation is more convenient, the cost is low, and the method is suitable for large-scale production; and meanwhile, the voidage is effectively controlled, so that the product quality consistency in the production process is guaranteed, the heat dissipation efficiency of the power electronic device is improved, and the service life of the power electronic device is prolonged.

The invention discloses a preparation and measurement method of a polymer-based multi-point force flexible sensor for knee joint pose measurement, and relates to the technical field of polymer-based flexible sensors and soft measurement. The structure of the multi-point force polymer-based flexible sensor shaped like a Chinese character'ao 'is designed for knee joint stress and posture state measurement, and the flexible sensor is prepared and packaged through a silk-screen printing method. A flexible sensor strain input-output knee joint stress data mapping set and a flexible sensor strain input-pose angle output data mapping set required by modeling are completed through a flexible sensor, a thin film force sensor corresponding to multi-point force and an inertial sensor corresponding to pose angle measurement of installed multi-point force polymers. And establishing a neural network soft measurement model based on an MLP algorithm, and carrying out training and verification. And the knee joint pose angle with reliable precision and the maximum stress state of the knee joint are obtained. The sensor has the advantages of being flexible, thin, skin-friendly, high in sensitivity and stable in signal output.

The invention provides a preparation technology of a three-dimensional camera shooting sonar sparse sensing array, and the method comprises the following steps: forming a patterned electrode on a PVDF or P (VDF-TrFE) piezoelectric film through vacuum adsorption and silk-screen printing according to sparse array element coordinates, and arranging a virtual transition array element at the periphery; performing laser etching on the edge contour and the exhaust hole of the piezoelectric film; designing a bonding positioning auxiliary tool, combining an ultrathin double-sided adhesive tape and a single-sided mask adhesive tape, and utilizing conductive silver paste to realize accurate electric connection between the array element and the PCB bonding pad; designing a polytetrafluoroethylene-metal flattening module, and laminating the array in a vacuum environment for curing and bonding; the matching layer is made of a low-impedance sound transmission material, glue filling and vacuum defoaming are performed from the back side in batches, and the sparse sensing array is prepared in combination with a polyimide film and a metal super-flat plate. The preparation problem of the large-aperture high-frequency imaging sonar on the sensing array is solved, and the array element position accuracy, the array element consistency and the imaging resolution can be improved.

The invention relates to the technical field of servers, and discloses a server configuration information display method and device, computer equipment and a storage medium, and the method comprises the steps: obtaining order information configured by a current server; inputting the order information into a bill of material system, obtaining screen printing information of each external device, and writing the screen printing information of each external device into a first storage area; reading the screen printing information of each external device in the first storage area by using the substrate management controller; acquiring in-place information of each external device configured by the current server by using the substrate management controller; comparing the screen printing information with the in-place information by using the substrate management controller; and under the condition that the comparison is passed, storing the silk-screen information to the target register, so as to obtain the silk-screen information in the target register by utilizing the basic input / output system in a startup state of the server, and displaying the silk-screen information on an interface of the basic input / output system. According to the invention, the configuration information of the server can be accurately identified and displayed.

The utility model discloses a back contact battery and a photovoltaic assembly, and relates to the field of photovoltaic technology. The method is used for reducing the process difficulty of forming a patterned first transparent conductive layer during mass production and is beneficial to prolonging the service life of a screen printing plate for manufacturing the patterned first transparent conductive layer. The back contact battery comprises a semiconductor substrate, a first doped semiconductor part, a second doped semiconductor part and a first transparent conductive layer. The second doped semiconductor portion is disposed on the second region and extends to cover the first doped semiconductor portion in the overlapping region. The first transparent conductive layer is disposed on the second doped semiconductor portion. A partial region in the overlapping region is a reverse electric leakage region. And a first transparent conductive layer extending from the second region is arranged in the reverse electric leakage region. The side line of the side, close to the first area, of the first transparent conducting layer is a first side line, the first side line is of a periodically repeated convex-concave alternating structure, and transition lines between convex and concave in the convex-concave alternating structure are not parallel to the first direction.

The invention relates to the technical field of silk-screen printing, in particular to a printing material allowance detection mechanism and method and a silk-screen printing device. The printing material allowance detection mechanism comprises a screen printing plate, a scraper assembly and an image acquisition device, the screen printing plate is arranged on a rack of the silk-screen printing device, a mesh area and a non-mesh area surrounding the outer side of the mesh area are arranged on the screen printing plate, meshes are formed in the mesh area, and the screen printing plate is used for bearing printing materials; the scraper assembly is in sliding connection with the rack, the scraper assembly is configured to be capable of horizontally moving above the screen printing plate, the scraper assembly comprises two scrapers which are arranged in parallel in a spaced mode, and the two scrapers are configured to be capable of alternately ascending and descending so as to abut against the screen printing plate; the image acquisition device is connected to the scraper assembly or is arranged on the rack; the image acquisition device is used for acquiring an image of a mesh area between the two scrapers; the detection result of the mechanism is not influenced by bubbles generated by printing materials, whether the screen printing plate is lack of materials or not can be accurately detected, and the phenomenon of misjudgment is avoided.

The invention discloses a potassium ion sensor based on AuNPs / MXene / SPCE and a preparation method thereof, and belongs to the technical field of electronic components. Comprising a screen-printed carbon electrode SPCE, an MXene layer modified on the surface of a working electrode of the screen-printed carbon electrode, a gold nanoparticle AuNPs layer formed on the surface of the MXene layer through an electrochemical deposition method, a potassium ion selective membrane covering the gold nanoparticle AuNPs layer, and a GO-PVA hydrogel layer coating the surface of the potassium ion selective membrane. According to the prepared sensor, only potassium ions in sweat can pass through the selective membrane, the selectivity of the sensor is improved, meanwhile, due to the application of the AuNPs / MXene composite material, the surface area-volume ratio of a silk-screen printing carbon electrode is greatly improved, more potassium ions participate in ion-electron conversion, the sensitivity of the sensor is improved, and the application range of the sensor is widened. And the detection range is expanded.

The invention provides a complex curved surface-oriented array structure silk-screen printing device and a control method thereof, and belongs to the technical field of advanced manufacturing. The printing device comprises a bed body module, a movement module, a silk-screen printing module and a control module, the posture position of a workpiece can be adjusted in the printing process, and the bed body module has five degrees of freedom and can adjust the posture of the workpiece in any curved surface shape. In the silk-screen printing process, the control module executes a professional numerical control G code program generated through path planning software, and the accuracy of the printing position can be guaranteed. The silk-screen printing equipment part moves a silk-screen printing module to a designated position to start printing on the basis of five-axis movement. Multi-material, high-precision, high-efficiency and damage-free manufacturing of the array structure can be realized, and the method has the characteristics of full-process automation, high forming speed, high efficiency and the like of silk-screen printing manufacturing, and has a good application prospect in the fields of precision machining, micro-nano machining and the like.

The invention discloses a preparation method of a multilayer co-fired ceramic disc of an electrostatic chuck, and belongs to the technical field of electrostatic chucks, and the preparation method comprises the following steps: S1, preparing organic suspension ceramic slurry with certain viscosity and uniform dispersion; s2, the ceramic slurry is manufactured into a ceramic green sheet with a certain thickness in a tape casting mode; s3, various holes are formed in the ceramic green sheet; s4, preparing metal electrode slurry; s5, metal conduction slurry is filled in the interconnection conduction holes of the green body sheet in a hole filling mode, and an adsorption electrode layer, a heating electrode layer, a parallel electrode layer and an interconnection conduction Pad are manufactured in a silk-screen printing mode; s6, green body blocks are manufactured; s7, laminating together by using a laminating machine in a positioning and laminating manner; s8, the laminated green ceramic plates are placed in a debinding furnace for glue discharging; and S9, performing high-temperature sintering in a high-temperature sintering furnace to obtain the ceramic.

The invention provides a miniature circuit breaker, which comprises a shell, a handle, a connecting rod, a contact support, a lock catch, a lock catch elastic piece and a support elastic piece, and is characterized in that the shell is provided with an indication window; the handle is rotationally mounted on the shell; the connecting rod is provided with a first rod part connected with the handle and a second rod part matched with the contact support; and the contact support is rotationally installed on the shell through a rotating shaft, and a first indicating part which can be arranged corresponding to the indicating window is formed on the contact support. In an opening state, the first indication part of the contact support is arranged corresponding to the indication window. In a switching-on state, the second indicating part of the lock catch corresponds to the indicating window, and the contact support and the lock catch are different in color during injection molding, so that compared with the prior art in which indicating surfaces with different colors need to be processed on the contact support in an ink screen printing manner after injection molding, the production process is simpler, and the production efficiency is improved. And the production cost is reduced.

The invention belongs to the technical field of electrode materials, and particularly relates to a flexible liquid metal electrode based on gallium-indium-tin alloy and a preparation method and application thereof.Liquid metal ink is prepared through an ultrasonic method, a screen printing technology is adopted, the liquid metal ink is coated on a flexible substrate, meanwhile, mechanical activation and nanoparticle strategies are introduced, and the flexible liquid metal electrode based on gallium-indium-tin alloy is prepared. The preparation method of the high-performance flexible liquid gold electrode with excellent conductivity and mechanical stability is developed. In the flexible liquid metal electrode based on the gallium-indium-tin alloy, due to the good conductivity and biocompatibility of gallium-based liquid metal, the flexible stretchable conductive electrode based on the gallium-indium-tin liquid metal becomes an ideal wearable flexible device circuit material, and the patterning ability of the gallium-indium-tin liquid metal is further improved. Patterning preparation of the circuit is carried out in a mode of silk-screen printing of the gallium-based liquid metal particles, and the patterned liquid metal circuit with excellent conductivity and flexibility is obtained through mechanical activation.

The invention discloses a multi-stage micro-nano structure flexible wearable pressure sensor inspired by skin, and a preparation method and application of the multi-stage micro-nano structure flexible wearable pressure sensor. The sensor is composed of a piezoresistive layer, an electrode layer and a packaging layer. The piezoresistive layer takes polydimethylsiloxane (PDMS) as a flexible substrate, a submillimeter-level cylindrical array main structure and a micron-level skin-like spinous secondary microstructure randomly distributed at the top end of the submillimeter-level cylindrical array main structure are constructed through a composite mold, and a nano-level conductive network is formed by adopting an MXene / MWCNT hybrid material through a dispensing process, so that multi-scale stress synergistic response is realized; the electrode layer takes a degradable lignocellulose biological plastic film prepared from bagasse as a base material, and a silver paste interdigital electrode is loaded through a screen printing process; the packaging layer is fully coated with a medical-grade polyurethane (PU) film so as to ensure signal stability. The sensor shows ultrahigh sensitivity, wide detection range and low detection limit through the synergistic effect of the submillimeter-micron-nano multilevel structure, and can be applied to the fields of human motion monitoring, intelligent electronic skin and the like.

The utility model discloses a solar cell constant tension printing screen, which comprises a screen frame, a metal wire mesh and a printing plate wire slot, the metal wire mesh is tensioned on the screen frame through a tensioning wire mesh, the printing plate wire slot is arranged on the metal wire mesh, the tensioning wire mesh bypasses the arc-shaped edge of the screen frame and is bonded on the outer frame wall of the screen frame, and the printing plate wire slot is arranged on the metal wire mesh. A tension sensor is arranged between the arc-shaped edge of the screen frame and the tensioning wire screen; and a silk screen tension pressure stabilizing strip is also propped against the tensioning silk screen and is movably supported on the screen frame through a thrust spring. The silk screen tension pressure stabilizing strip abuts against the inner side face of the tension silk screen and can support the tension silk screen. The tension sensor is a thin film pressure sensor, and the installation angle alpha of the tension sensor is 45 degrees. The tension sensors are installed on the arc frame edge of the screen frame, and at least one tension sensor is installed on the arc frame edge of each side edge of the screen frame. The screen printing plate can automatically adjust the tension of the silk screen so as to ensure the stability of the tension of the silk screen.

The invention discloses an automatic conductive ink screen printing quality detection method based on a big data model. The method comprises the following steps: acquiring hyperspectral image data, three-dimensional shape data and real-time impedance distribution data of a conductive ink screen printing layer; performing local outlier factor optimization processing on the hyperspectral image data, and extracting a pixel-level spectral feature vector; performing vertical weight function Gaussian regression filtering on the three-dimensional shape data to generate a topological smooth curved surface coordinate set; optimizing the real-time impedance distribution data based on the conductivity distribution matrix, and outputting a noise reduction conductivity matrix; constructing an association graph and a node feature tensor based on the detection key points, and generating silk-screen multi-modal data; through modal interaction, features are extracted in stages, and cross-modal joint features are extracted through multi-stage joint clustering optimization; and a task space separation head module is input, and a quality evaluation result is output through classification and regression branches. According to the method, multi-modal data deep fusion, noise robustness improvement, cross-modal feature accurate extraction and efficient real-time detection are realized.

The invention discloses a post-pressing multilayer high-frequency metal-based carbon oil circuit board production method, and relates to the field of circuit board production, and the method comprises the steps: carrying out the engineering design, carrying out the pretreatment preparation after the engineering design is completed, and carrying out the hole metallization control of a high-frequency microwave board after the pretreatment preparation is completed. And after hole metallization control of the high-frequency microwave plate is completed, copper plating processing is carried out, and after copper plating processing is completed, metal-based chemical gold plating processing is carried out. According to the post-pressing multilayer high-frequency metal-based carbon oil circuit board production method, a dielectric layer of a multilayer high-frequency metal-based board is generally made of a high-frequency material, a multilayer high-frequency microwave board is firstly manufactured, then pressed together with a metal-based board and then subjected to surface treatment and forming, a carbon oil board is generally used on an FR4 board and is subjected to screen printing through common gauze, the resistance value and thickness error are large, and the resistance value and thickness error are large. And the produced post-pressed high-frequency metal-based carbon oil circuit board is good in heat dissipation and good in signal transmission performance, and the thickness and resistance of the carbon oil meet the requirements of customers.

The invention discloses a defect detection method for a photovoltaic screen printing plate, which comprises the following steps: S1, acquiring an image through image acquisition equipment; s2, performing graying processing on the image obtained in the step S1; s3, carrying out edge detection on the image, and detecting the shape and size of a gap; s4, selecting a structural element, and scanning the image by using the structural element; s5, scanning the whole binary image by using the selected structural elements; the problems that in the prior art, different types of defects cannot be accurately distinguished and recognized, defect classification is wrong, and accurate evaluation of the quality of the photovoltaic panel is affected are solved, the screen printing plate condition is presented from multiple aspects, hidden defects are found more easily, and the detection comprehensiveness is improved; according to the method, different types of defects of the photovoltaic panel are distinguished more finely through extraction of various features, and recognition is carried out by expressing lines and region edges through region feature filling aiming at the following tiny fuzzy defects.

A laser alignment tool is a device that facilitates the efficient and accurate alignment of a product for different manufacturing processes such as Direct-to-Film, screen printing, embroidery, etc. The device includes a tool base, at least one laser module, a controller, and a portable power source. The tool base corresponds to the portion of the device that supports the operation of the at least one laser module. The tool base also facilitates the attachment of the device to a surface adjacent to the product that needs to be aligned. The at least one laser module emits one or more light beams on the adjacent surface that can be used to align the desired product. The controller enables the user to selective control the operation of the at least one laser module. The portable power source provides the electrical power necessary for the operation of the at least one laser module.

The invention relates to the technical field of silk-screen printing, and discloses a mesh straightness optimizing device which comprises a supporting frame, first supporting plates are fixedly connected to the four corners of the inner side of the supporting frame, one ends of the multiple first supporting plates are fixedly connected with the same first inner frame, and a fixing frame is arranged on the upper side of the supporting frame; second supporting plates are fixedly connected to the four corners of the inner side of the fixing frame, one ends of the multiple second supporting plates are fixedly connected with the same second inner frame, multiple hollow plates are fixedly connected to the periphery of the top of the fixing frame at equal intervals, and rotating shafts are rotatably connected to the inner sides of the multiple hollow plates; and the outer sides of the multiple rotating shafts are fixedly connected with L-shaped plates. When a sliding block moves, an L-shaped plate is driven to rotate through a movable plate, so that a roller is driven to move downwards to press a single net wire, the tightness of the single net wire can be adjusted, and the net wire tension of each part on a net plate can be accurately controlled.

The invention discloses a method for improving the electrode resistance uniformity of an AC electroluminescent device, and the preparation method of a complete ACEL device comprises the following steps: uniformly spraying a metal nanowire electrode material on the surface of a substrate to form a bottom electrode with uniform resistance and excellent conductivity; a bottom electrode is sequentially covered with a dielectric layer material and a light-emitting layer material through the screen printing technology, the surface of the light-emitting layer is further sprayed with a layer of metal nanowire electrode material to construct an upper electrode, finally, the upper electrode is covered with a packaging material through screen printing to protect a device, the whole process is simple in technology, high in repeatability and reliability, and the manufacturing cost is low. Wherein the surface roughness of the light-emitting layer affects the electrical performance of a metal nanowire electrode, the long-term stability of the electrode is reduced due to high roughness, and the service life of the electrode is further shortened, so that the surface roughness of the light-emitting layer is controlled by adjusting the solid content of the fluorescent powder in the light-emitting layer, which is very important for improving the performance and the stability of a device.

The invention relates to the technical field of ceramic substrates, in particular to a ceramic substrate blank powder coating and sintering process. Comprising the following steps: step 1, uniformly stirring boron nitride powder, terpilenol, ethyl cellulose, butyl benzyl phthalate and phosphate, and grinding to obtain coating powder; step 2, printing powder on the surface of the green body by using a silk-screen printing technology to form a powder pattern; a powder coating green body is obtained; step 3, stacking N powder-coated green bodies to obtain laminated green bodies; 4, the laminated green body is subjected to glue discharging sintering and sand blasting in sequence; and obtaining the ceramic substrate.

The invention discloses a capacitor defect detection method based on a YOLOv5 model, and the method comprises the following steps: 1, training the YOLOv5 model through employing a first data set, and obtaining a pre-training model; 2, training the pre-training model by adopting the second data set to obtain a capacitance defect detection model; 3, inputting a picture into the capacitance defect detection model to obtain a target detection defect; and 4, screening the target detection defects by adopting a multi-threshold setting mechanism to obtain a final target defect type. According to the invention, various possible defects of the capacitor product in the silk-screen printing process can be accurately identified and measured.

The utility model discloses a screen printing machine glue scraping mechanism which comprises an installation plate, a first side supporting plate, a second side supporting plate, a rotating plate, scraping plates, a limiting block, a limiting clamping plate, an air cylinder and a clamping piece. The rotating plate can be driven by a motor to rotate, and therefore the scraping plates on the upper end face and the lower end face of the rotating plate can be continuously switched; according to the invention, a single scraper is prevented from being heated and softened after being continuously contacted and rubbed with a silk screen, the influence on the printing quality after the printing pressure is reduced is avoided, the heat dissipation of the scraper is also facilitated in the rotating process of the scraper, the limiting block is a square limiting block with the periphery in smooth transition, the limiting clamping plate is a clamping plate with a U-shaped section, and the limiting block is clamped on the limiting clamping plate; by arranging the limiting block and the limiting clamping plate, the motor can drive the rotating plate to rotate by 90 degrees at a time, so that the scraping plates on the upper end face and the lower end face of the rotating plate are conveniently positioned, converted and adjusted, the clamping piece is driven by the air cylinder to descend to clamp the scraping plates, and the stability of the scraping plates and the reliability of the device can be improved when the device does reciprocating glue scraping motion.

The invention relates to the technical field of electronic paste, in particular to copper electrode paste for an NTC thermistor and a preparation method and application of the copper electrode paste. A copper electrode slurry for an NTC thermistor comprises copper powder, an inorganic glass binder, an organic carrier and a dispersant, the inorganic glass binder comprises CuO and NiO, and the organic carrier comprises a polymer thickener. The copper electrode slurry can be coated on the surface of an NTC thermistor ceramic substrate through a silk-screen printing method, can be used as a metallized conductive layer after being sintered in nitrogen, is used for temperature measurement, temperature compensation, temperature control components and the like, and is wide in application. The copper electrode slurry for the NTC thermistor provided by the invention can be sintered in nitrogen at 550-650 DEG C, and has the advantages of wide sintering interval, good sintering appearance, excellent welding performance and strong adhesive force. After sintering, the ohmic contact is good, so that the prepared NTC thermistor can truly reflect the resistance value of a substrate, and the phenomenon of ion migration is avoided.

The invention discloses a high-integration-level interdigital flexible strain sensing array and a preparation method thereof. The preparation method comprises the following steps: circularly cutting a flexible thin film through a nanosecond laser to manufacture a thin film substrate with small holes; after the small holes in the film substrate are aligned with the small points of the interdigital array electrode layer silk-screen printing screen plate, an interdigital array upper electrode layer is manufactured through via hole silk-screen printing; covering the cured upper electrode layer of the interdigital array with a protective film, and performing hot pressing and cooling to form an upper packaging layer; after small holes in the back face of the film substrate where the upper packaging layer is installed are aligned with small points of a back face electrode layer silk-screen printing screen plate, an interdigital array lower electrode layer is manufactured through the silk-screen printing technology; and covering the lower electrode layer of the interdigital array with a protective film, and performing hot-pressing packaging to obtain a complete sensing array. According to the invention, the bottleneck that the traditional interdigital array is complex in design and low in integration level is successfully broken through, high integration of the sensor array is realized, and more complex strain monitoring requirements can be met.

The invention discloses a material taking manipulator control system and method of a screen printing machine, and relates to the technical field of mechanical automation control, and the method comprises the following steps: obtaining an initial position image of a material to be taken, collecting a high-resolution image by using an industrial camera, and synchronously recording a shooting timestamp; through multi-angle illumination compensation and image recognition precision optimization, the positioning precision of the material taking manipulator under the condition of complex materials is effectively improved, the risks of clamping deviation and material falling are remarkably reduced, and it is ensured that the grabbing action is stable and reliable. And meanwhile, an image recognition feedback mechanism and an error self-learning function are introduced, so that dynamic deviation correction of the system under abnormal conditions such as illumination interference and edge shielding is realized, and the anti-interference capability and the self-adaptive stability of long-term operation of the system are enhanced. The whole scheme has remarkable technical advantages in the aspect of improving the automation precision and the production efficiency of the screen printing machine.

The invention provides a defect detection method and a defect detection device for a silk-screen product. The defect detection method comprises the following steps: controlling a camera to collect a product image of a detected silk-screen product; matching the product images one by one by using a plurality of screen printing templates in a pre-constructed screen printing template library; wherein the plurality of silk-screen templates are generated by a plurality of standard product images; the various standard product images are images acquired by controlling the camera to acquire the standard silk-screen product under different acquisition conditions; and determining a defect detection result of the detected silk-screen product according to a matching result of the silk-screen template and the product image. Through standard product images acquired from standard silk-screen products under various acquisition conditions, various silk-screen templates can be generated, and a rich silk-screen template library is formed; therefore, when the silk-screen template library is used for matching the detected silk-screen product, the compatibility of defect detection can be improved, misjudgment is avoided, and the detection accuracy is improved.

Device (10) for producing three-dimensional screen-printed workpieces, in particular a 3D screen-printing system, with a printing screen (12) and with a squeegee device (14) for flooding the printing screen (12) with a printing compound and / or for pressing printing compound through the printing screen (12), wherein the squeegee device (14) has at least one squeegee tool (16), an adjusting device (28) for adjusting the inclination of the squeegee tool (16), and a squeegee bearing (34) which allows an inclination adjustment of the squeegee tool (16) by means of the adjusting device (28) about an inclination axis (N), wherein the squeegee bearing (34) has at least one spring bearing (36, 38).

The invention provides a vertical silk-screen up-and-down bidirectional screen shifting device, and relates to the field of circuit board production, the vertical silk-screen up-and-down bidirectional screen shifting device comprises mounting frames, the two mounting frames are each provided with a screen shifting mechanism, screen mechanisms are arranged in the two mounting frames, and a same PCB body is arranged between the two screen mechanisms; fixed plate frames are fixedly connected to the outer walls of the two sides of the two mounting frames, and displacement processing modules are arranged on the four fixed plate frames; the displacement mechanism for moving the screen printing plate comprises four fixing frame pieces. According to the PCB printing screen shifting device, the effect of shifting of the PCB printing screen is achieved, the position between the PCB and the screen shifts between the previous printing and the current printing, printing ink left in the previous printing is staggered from the position of a hole in the printed PCB, and therefore the amount of the printing ink left on the screen is always only the amount left in the previous printing, and the printing efficiency is improved. And the ink is prevented from blocking holes.