Automatic control method and device for solar printing equipment, terminal and storage medium

Abstract

The invention provides an automatic control method and device for solar printing equipment, a terminal and a storage medium. The control method comprises the steps that the printing wet weight, the grid line width, the grid line height, the slurry viscosity and the silk screen tension are obtained; the printing pressure, the silk screen distance and the printing speed are adjusted according to at least one of the printing wet weight, the grid line width, the grid line height, the slurry viscosity and the silk screen tension; and adjusting the contact angle of the scraper according to the printing wet weight and the slurry viscosity. All the parameters are monitored, all the parameters are integrated to automatically adjust the printing pressure, the silk screen distance, the printing speed and the like in the printing process, manual work is not needed, the production process is strictly controlled, defects in the production process are greatly reduced, and the qualified rate of products is increased.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular to an automatic control method, device, terminal and storage medium for solar printing equipment. Background Art

[0002] After the processes of texturing, diffusion and PECVD, solar cells have been made into PN junctions, which can generate current under light. In order to conduct the current, electrodes need to be prepared on the surface of the cell. Screen printing is currently the most common process technology for preparing contact electrodes for solar cells.

[0003] In screen printing, as production progresses, the equipment status may change, and the screen tension and slurry viscosity may also change, thereby affecting the grid line width, grid line height and printed wet weight, thereby affecting the quality of solar cells.

[0004] In the prior art, in order to ensure the production quality of solar cells, the grid line width, grid line width and printed wet weight are usually measured manually and the printing equipment is adjusted based on the measurement results and experience. This method relies on manual operation and is greatly affected by human factors. The adjustment effect is not accurate enough and cannot effectively reduce the defect rate in the production process. Summary of the invention

[0005] The embodiments of the present invention provide a method, device, terminal and storage medium for automatically controlling a solar printing device, so as to solve the problem of high product defect rate caused by manual adjustment of the solar printing device in the prior art.

[0006] In a first aspect, an embodiment of the present invention provides an automatic control method for a solar printing device, comprising:

[0007] Obtain printing wet weight, grid line width, grid line height, slurry viscosity and screen tension;

[0008] Adjusting the printing pressure, screen spacing and printing speed according to at least one of the printing wet weight, grid line width, grid line height, slurry viscosity and screen tension;

[0009] Adjust the scraper contact angle according to the wet weight of the print and the viscosity of the slurry.

[0010] In a second aspect, an embodiment of the present invention provides an automatic control device for solar printing equipment, comprising:

[0011] Data monitoring module, used to obtain printing wet weight, grid line width, grid line height, slurry viscosity and screen tension;

[0012] A first parameter adjustment module is used to adjust the printing pressure, screen spacing and printing speed according to at least one of the printing wet weight, grid line width, grid line height, slurry viscosity and screen tension;

[0013] The second parameter adjustment module is used to adjust the scraper contact angle according to the printing wet weight and the slurry viscosity.

[0014] In a third aspect, an embodiment of the present invention provides a control terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for automatically controlling a solar printing device provided in the first aspect or any possible implementation of the first aspect are implemented.

[0015] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the automatic control method of a solar printing device provided in the first aspect or any possible implementation method of the first aspect.

[0016] The embodiment of the present invention provides a method, device, terminal and storage medium for automatic control of solar printing equipment. The above-mentioned method for automatic control of solar printing equipment includes: obtaining the printing wet weight, grid line width, grid line height, slurry viscosity and screen tension; adjusting the printing pressure, screen spacing and printing speed according to at least one of the printing wet weight, grid line width, grid line height, slurry viscosity and screen tension; adjusting the scraper contact angle according to the printing wet weight and slurry viscosity. In the embodiment of the present invention, the printing wet weight, grid line width, grid line height, slurry viscosity and screen tension are monitored, and the printing pressure, screen spacing and printing speed in the printing process are automatically adjusted by integrating various parameters. It does not rely on manual labor, and strictly controls the production process by integrating various parameters. Abnormalities in the production process can be discovered and adjusted in time, and the adjustment is more precise, which greatly reduces defects in production and improves the qualified rate of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a schematic diagram of the surface of a solar cell;

[0019] Figure 2 It is a screen-printed schematic;

[0020] Figure 3 It is a schematic diagram of the scraper contact angle;

[0021] Figure 4 This is a flow chart of an implementation method of an automatic control method for solar printing equipment provided by an embodiment of the present invention;

[0022] Figure 5 is a structural schematic diagram of a screen printing device provided by an embodiment of the present invention;

[0023] Figure 6 It is a structural schematic diagram of an automatic control device for solar printing equipment provided by an embodiment of the present invention;

[0024] Figure 7 is a schematic diagram of a control terminal provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0027] The production of solar cells requires processes such as texturing and cleaning, boron diffusion, post-oxidation, BSG removal and back polishing, LPCVD, phosphorus diffusion, PSG removal and de-wrap plating, front AlOX, front and back SiNX, screen printing, sintering and light injection, LECO, testing and sorting.

[0028] In order to collect and conduct current and provide welding points for the cells to be connected in series, electrodes need to be prepared on the surface of the cells. Usually, metal paste is printed on the silicon wafer using screen printing technology to form the contact electrodes of solar cells. The electrodes are divided into two types: front electrodes and back electrodes. Grid electrodes, also known as grid lines, include main grids and auxiliary grids (also called fine grids). Figure 1 The fine grid penetrates silicon nitride and aluminum oxide after sintering to form a good ohmic contact with silicon and is responsible for collecting carriers; the main grid does not need to burn through silicon nitride and aluminum oxide, and is mainly responsible for conducting electricity and ensuring the welding tension with the welding strip.

[0029] Screen printing uses a scraper to squeeze the screen and then elastically deform it, and then print the slurry on the silicon wafer. TOPCon cells have a total of four printing processes, which are: the first: back main grid (silver paste) printing and drying (drying organic matter, so that the slurry adheres to the silicon wafer and will not deform or fall off in subsequent production); the second: back fine grid (silver paste) printing and drying; the third: front main grid (silver paste) printing and drying; the fourth: front fine grid (silver aluminum paste or silver paste) printing; after screen printing, it undergoes a drying process (drying the slurry to volatilize the organic matter), a sintering process (the slurry and glass body dissolve and penetrate the silicon nitride layer to form an alloy with silicon) and subsequent processes to finally form a solar cell.

[0030] Figure 2 A schematic diagram of screen printing is shown; reference Figure 2 , printing includes 4 steps:

[0031] 1. Rotation: The slurry is spread flat on the screen to prepare for filling, which affects the thixotropy and rheology. The slurry viscosity is required to be uniform and there is no leakage.

[0032] 2. Filling: The scraper prints the slurry on the silicon wafer at a certain contact angle, pressure and speed, forming a good contact with the silicon wafer with a certain adhesion. The slurry is required to have good rheology, low viscosity and easy printing and molding;

[0033] 3. Release from the plate: After the whole piece is printed, the screen rises, and the slurry that was not printed on the silicon wafer is broken and separated on the side wall of the screen and latex film;

[0034] 4. Stability: The slurry for missed printing requires a small deformation. Under the action of surface tension / leveling, the two sides of the slurry break and the unevenness on the slurry surface caused by the intersection of the screen will return to smoothness. The adhesion between the slurry and the silicon wafer and the stability of the slurry viscosity will have a stable process.

[0035] The slurry is a raw material for the screen printing process in the production of solar cells. It is composed of silver powder, glass powder, organic body, etc. It has certain fluidity, thixotropy, plasticity and other properties. It can be printed onto the solar silicon wafer through the screen opening and has stable shaping. It will not deform during the sintering process. After sintering, it has the function of penetrating silicon nitride and aluminum oxide to form good ohmic contact with the silicon wafer to collect carriers.

[0036] There is a very important parameter in the performance of slurry, which is the slurry viscosity. Slurry viscosity, also known as internal friction, is the resistance generated when a layer of liquid moves relative to another layer of liquid, and it characterizes the difficulty of slurry flow. If the viscosity is too high, the fluidity becomes poor, and complete printing cannot be achieved. Problems such as grid blocking, grid breakage, nodes, and virtual printing are prone to occur; if the viscosity is too low, the slurry is prone to collapse after printing, making the grid line thick and short, reducing the conversion efficiency of solar cells. Therefore, the slurry viscosity should be kept within a certain range, the more stable the better, in order to improve the conversion efficiency of solar cells and ensure that the solar cells have excellent appearance and stable performance.

[0037] The scraper speed is also the printing speed, which refers to the speed at which the scraper moves horizontally during printing;

[0038] Scraper pressure, also known as printing pressure, refers to the force that forces the scraper to press the screen vertically downward in printing mode;

[0039] The scraper contact angle refers to the angle between the vertical edge of the scraper and the substrate plane. Figure 1 The size of this angle can control the amount of slurry extruded by the scraper. Generally, the printing amount is T30°>T45°>T60°. Figure 3 The scraper speed, pressure and contact angle affect the amount of slurry output, thus affecting the quality of the grid line.

[0040] Screen spacing (also known as printing height offset) refers to the distance between the bottom surface of the screen and the upper surface of the substrate. This distance can also be expressed as the breakaway distance. When adjusting this parameter, you can first lower it until the screen touches the substrate, and then slowly raise the spacing until the appropriate distance is reached.

[0041] Screen tension is a parameter that measures the elasticity of the screen. During the screen printing process, the scraper edge is in linear contact with the screen and the silicon wafer. Once the compressive force disappears, the screen should immediately leave the silicon wafer, otherwise the required clear pattern will not be printed.

[0042] In the screen printing process of solar cell production, the key quality control points are the wet weight of printing (the weight of the slurry printed on the surface of the silicon wafer without drying), the width of the grid line and the height of the grid line. Under the ideal state of screen printing, the grid line morphology is narrow line width, large aspect ratio (that is, the thinner and higher the grid line after printing, the better), rectangular cross-section, uniform height and width, and good contact with the silicon wafer. In this state, the wet weight printed on the surface of each silicon wafer is also uniform and stable. The grid line is printed thin to reduce the shading area of ​​the grid line on the surface of the solar cell, and the height is printed high to increase the cross-sectional area of ​​the grid line, thereby reducing the resistance loss of the grid line and better improving the conversion efficiency of the battery.

[0043] From the screen printing process, we know that printing speed, printing pressure, screen tension, screen spacing, scraper contact angle and slurry viscosity will affect the printed wet weight, grid line width and grid line height. With the use and wear of continuous production, the state of the printing equipment may be unstable, and the screen tension and slurry viscosity will also change. Therefore, in order to ensure the quality of solar cells, it is necessary to pay attention to the printed wet weight, grid line width and grid line height, and adjust them in time.

[0044] In the prior art, the operator usually weighs the printing weight of the slurry every hour. The specific steps are: take a coated silicon wafer without slurry printed on it, weigh the silicon wafer, put the weighed silicon wafer on the running conveyor belt, and record the printing station number during printing. After printing, take the silicon wafer off and weigh it again, and the difference between the two weights is the printing wet weight.

[0045] The gate line width and gate line height are usually measured by operators every 2 hours. The specific steps are: take a silicon wafer (not sintered) after normal printing, use relevant measuring tools to measure under a microscope, and record the measurement results.

[0046] Finally, adjustments to the printing equipment are made based on the measurement results and according to personal experience.

[0047] Since the above operations are all performed manually by staff, errors are likely to occur during the operation, resulting in a decrease in the accuracy of the measurement results; and human hands touching the silicon wafers are likely to cause fragments or contaminate the surface of the silicon wafers, resulting in a decrease in the fragmentation rate and the qualified rate of finished products.

[0048] At the same time, the adjustment of printing equipment parameters is a very complicated process. Various factors will affect each other, which requires comprehensive consideration and is greatly affected by personal experience. With the use and wear of continuous production, the state of printing equipment may become unstable and inaccurate. The screen tension and slurry viscosity will change, and there may be differences between different batches of materials. Therefore, it is almost impossible to achieve the ideal grid line morphology under the screen printing state by relying on the experience of the staff for adjustment, which greatly affects the production efficiency, the conversion efficiency of the battery and the qualified rate of the product.

[0049] Based on the above, see Figure 4 , the embodiment of the present invention provides a flow chart of an automatic control method for solar printing equipment, which is described in detail as follows:

[0050] The above-mentioned solar printing equipment automatic control method includes:

[0051] S101: Obtaining printing wet weight, grid line width, grid line height, slurry viscosity and screen tension;

[0052] In the embodiment of the present invention, sensors can be set to automatically collect parameters such as printing wet weight, grid line width, grid line height, slurry viscosity and screen tension, which is not affected by human factors, reduces the two tedious processes of personnel weighing and measuring grid line width and height, saves time, and improves the timeliness and accuracy of measurement results. It can also reduce debris and silicon wafer dirt (such as fingerprints, silicon wafer scratches, slurry scratches, etc.) caused by human contact during the measurement process.

[0053] Specifically, in a possible implementation, the slurry viscosity can be detected by a viscometer arranged on the scraper;

[0054] The viscometer is set on the scraper. During the scraper pushes the slurry forward for filling and printing, the viscometer can sense the viscosity of the slurry, thereby detecting the viscosity of the slurry and sending it to the control terminal.

[0055] The screen tension can be detected by the pressure sensor arranged on the scraper;

[0056] The pressure sensor can be arranged on the blade of the scraper. The pressure sensor can detect the size of the screen rebound force when the scraper is pressed onto the screen for slurry printing, that is, the size of the screen tension during the printing process, thereby detecting the obtained screen tension and sending it to the control terminal.

[0057] The grid line width and grid line height can be detected by image monitoring equipment;

[0058] In the embodiment of the present invention, an image monitoring device can be used to obtain an image of a silicon wafer, and the gate line width and gate line height can be detected. For example, an electron microscope can be used for non-contact scanning to measure the gate line width and gate line height.

[0059] The wet weight of the printed material is measured and calculated by the weight detection equipment installed before and after the printing machine.

[0060] In the embodiment of the present invention, a high-precision electronic scale (electronic scale 1 and electronic scale 2) installed on the machine platform can perform automatic measurement.

[0061] Exemplary, reference Figure 5 , the coated silicon wafer is conveyed to the printing machine via a conveyor belt for printing, and then conveyed to the drying box or sintering furnace via a conveyor belt. It is weighed once before entering the printing machine (electronic scale 1), which is the weight of the silicon wafer before printing the slurry. It is weighed again after printing (electronic scale 2), which is the total weight of the silicon wafer and the slurry. The difference between the two weights is the wet weight of the printing. At the same time, the coated silicon wafer can be conveyed to the electron microscope test machine via a conveyor belt after weighing to measure the width and height of the gate line. For details, please refer to Figure 5 .

[0062] S102: adjusting the printing pressure, screen spacing and printing speed according to at least one of the printing wet weight, grid line width, grid line height, slurry viscosity and screen tension;

[0063] Printing speed, printing pressure, screen tension, screen spacing, scraper contact angle and slurry viscosity will affect the printing wet weight, grid line width and grid line height. Since the slurry viscosity and screen tension are inconvenient to adjust, the slurry viscosity and screen tension are not adjusted in the embodiment of the present invention, but the printing pressure, screen spacing and printing speed are adjusted by monitoring the printing wet weight, grid line width, grid line height, slurry viscosity and screen tension, so as to adjust the printing wet weight, grid line width and grid line height, thereby ensuring the printing quality of the solar cell.

[0064] S103: Adjust the scraper contact angle according to the wet weight of the printing and the viscosity of the slurry.

[0065] In the embodiment of the present invention, the contact angle of the scraper is adjusted according to the wet weight of the printing and the viscosity of the slurry to ensure the printing quality of the solar cell.

[0066] Based on the above, the embodiments of the present invention monitor the printing wet weight, grid line width, grid line height, slurry viscosity and screen tension, and automatically and accurately adjust the printing pressure, screen spacing, printing speed and scraper contact angle without relying on manual labor, thereby effectively ensuring the quality of solar cells and reducing the defective rate in the production process.

[0067] In a possible implementation, S102 may include:

[0068] S1021: starting from the last parameter adjustment, if the change in print wet weight is greater than the first change, the change in grid line height is greater than the second change, or the change in grid line width is greater than the third change, then the printing pressure, screen spacing, and printing speed are adjusted according to the current print wet weight, the current grid line width, and the current grid line height;

[0069] S1022: Starting from the last parameter adjustment, if the change in slurry viscosity is greater than the fourth change or the screen tension is greater than the fifth change, the printing pressure, screen spacing and printing speed are adjusted according to the current slurry viscosity and the current screen tension.

[0070] When there is a large deviation in any of the printed wet weight, grid line height and grid line width, the quality of the solar cell will be affected. Therefore, when it is detected that the deviation of any of the printed wet weight, grid line height and grid line width is too large, the printing pressure, screen spacing and printing speed are adjusted in time according to the current printed wet weight, current grid line width and current grid line height;

[0071] Similarly, when the deviation of the slurry viscosity and the screen tension is too large, it will also affect the printed wet weight, grid line height and grid line width, thereby affecting the quality of the solar cell. Therefore, when it is detected that the deviation of any one of the slurry viscosity and the screen tension is too large, the printing pressure, screen spacing and printing speed are adjusted according to the current slurry viscosity and the current screen tension.

[0072] After adjusting the printing pressure, screen spacing and printing speed, the reaction is the adjustment of the printing wet weight, grid line height and grid line width. As the production proceeds, the printing wet weight, grid line height and grid line width may become abnormal again. Therefore, the above adjustment process is a continuous process. After an adjustment is completed, after a period of time, if the various parameters deviate again, they need to be adjusted again.

[0073] Since this adjustment is based on the adjustment after the last adjustment, the change in print wet weight, the change in grid line width, etc. are all changes relative to the last adjustment, that is, the change within an adjustment cycle. For example, after the last adjustment, the print wet weight, grid line height and grid line width are adjusted accordingly, and the print wet weight, grid line height and grid line width at this time are recorded, and the current printing start and end, grid line height and grid line width are obtained in real time, and the corresponding difference is made with the print wet weight, grid line height and grid line width after the last adjustment to obtain the change.

[0074] Similarly, the changes in slurry viscosity and screen tension are also determined from the last adjustment.

[0075] Since the wet weight of printing is too large, the printing pressure can be increased, the printing speed can be reduced, and the screen spacing can be reduced to reduce the printing humidity; vice versa. Similarly, when the grid line width is too large, the printing pressure can be reduced, the printing speed and screen spacing can be increased to reduce the grid line width; and when the grid line height is too small, the printing pressure can be reduced, the printing speed and screen spacing can be increased to increase the grid line height.

[0076] Similarly, printing pressure is negatively correlated with printing wet weight and grid line height, and positively correlated with grid line width; printing speed and screen spacing are just the opposite, both of which are positively correlated with printing wet weight and grid line height, and negatively correlated with grid line width.

[0077] Based on the above analysis, in a possible implementation, S1021 may include:

[0078] 1. According to the current printing pressure, the current screen spacing, the current printing speed, the current printing wet weight, the current grid line width and the current grid line height, the printing pressure, the screen spacing and the printing speed are adjusted in combination with the first formula;

[0079] The first formula may include:

[0080]

[0081] Among them, N 1h is the adjusted printing pressure, V 1h is the adjusted printing speed, D 1h is the adjusted screen spacing; N q is the printing pressure at the current moment, V q is the current printing speed, D q is the screen spacing at the current moment; m t is the wet weight of printing at the current moment, w t is the current grid line width, h t is the grid line height at the current moment; m0 is the reference printing wet weight, w0 is the reference grid line width, h0 is the reference grid line height; α1, α2, α3, β1, β2, β3, γ1, γ2, γ3 are all adjustment coefficients.

[0082] In the embodiment of the present invention, based on the correlation analysis between various parameters, a first formula is designed to achieve accurate adjustment of production parameters, thereby ensuring the production quality of solar cells.

[0083] It should be noted that the printing pressure, screen spacing, printing speed and scraper contact angle will not change from the end of one adjustment to the next adjustment, so the current printing pressure, screen spacing, printing speed and scraper contact angle are all the printing pressure, screen spacing, printing speed and scraper contact angle calculated in the last adjustment. Therefore, the calculated printing pressure, screen spacing, printing speed and scraper contact angle can be recorded after S103, that is, after the current adjustment, for the next adjustment, thereby avoiding repeated acquisition of data and reducing the difficulty of data processing.

[0084] In a possible implementation, S1022 may include:

[0085] 1. According to the current printing pressure, the current screen spacing, the current printing speed, the current slurry viscosity and the current screen tension, the printing pressure, the screen spacing and the printing speed are adjusted in combination with the second formula;

[0086] The second formula may include:

[0087]

[0088] Among them, N 2h is the adjusted printing pressure, V 2h Adjusted printing speed, D 2his the adjusted screen spacing; N q is the printing pressure at the current moment, V q is the current printing speed, D q is the screen spacing at the current moment; η t is the slurry viscosity at the current moment, T t is the screen tension at the current moment; η0 is the reference slurry viscosity, T0 is the reference screen tension; φ1, φ2, φ3, λ1, λ2, λ3 are all adjustment coefficients.

[0089] In a possible implementation, S103 may include:

[0090] S1031: Starting from the last parameter adjustment, if the change in slurry viscosity is greater than the fourth change or the change in print wet weight is greater than the first change, the scraper contact angle is adjusted according to the current slurry viscosity and the current print wet weight.

[0091] In a possible implementation, S1031 may include:

[0092] 1. According to the current slurry viscosity, the current printing wet weight and the current scraper contact angle, the scraper contact angle is adjusted in combination with the third formula;

[0093] The third formula may include:

[0094]

[0095] Among them, θ h is the adjusted scraper contact angle, θ q is the scraper contact angle at the current moment, m t is the wet weight of printing at the current moment, μ t is the slurry viscosity at the current moment, and m0 is the reference printing wet weight.

[0096] Based on the above analysis, similarly, in the embodiment of the present invention, the change in slurry viscosity and the change in printed wet weight after the last adjustment are monitored. When the change is too large, the scraper contact angle is adjusted to achieve adjustment of printing humidity, grid line width and grid line height, thereby ensuring the quality of solar cells.

[0097] For example, when the change in print wet weight is too large, the larger the print wet weight, the larger the adjusted scraper contact angle is, which reduces the slurry discharge amount, thereby reducing the print wet weight.

[0098] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0099] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0100] Figure 6 The following is a schematic diagram showing the structure of an automatic control device for solar printing equipment provided by an embodiment of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows:

[0101] like Figure 6 As shown, the automatic control device of solar printing equipment includes:

[0102] Data monitoring module 21, used to obtain printing wet weight, grid line width, grid line height, slurry viscosity and screen tension;

[0103] A first parameter adjustment module 22, for adjusting the printing pressure, screen spacing and printing speed according to at least one of the printing wet weight, grid line width, grid line height, slurry viscosity and screen tension;

[0104] The second parameter adjustment module 23 is used to adjust the scraper contact angle according to the wet weight of the printing and the viscosity of the slurry.

[0105] In a possible implementation, the first parameter adjustment module 22 may include:

[0106] A first adjustment unit is used to adjust the printing pressure, screen spacing and printing speed according to the current printing wet weight, the current grid line width and the current grid line height, if the change in the printing wet weight is greater than the first change, the change in the grid line height is greater than the second change or the change in the grid line width is greater than the third change since the last parameter adjustment;

[0107] The second adjustment unit is used to adjust the printing pressure, screen spacing and printing speed according to the current slurry viscosity and the current screen tension if the change in slurry viscosity is greater than the fourth change or the screen tension is greater than the fifth change since the last parameter adjustment.

[0108] In a possible implementation, the first adjustment unit may be specifically used to adjust the printing pressure, screen spacing and printing speed according to the current printing pressure, the current screen spacing, the current printing speed, the current printing wet weight, the current grid line width and the current grid line height in combination with the first formula;

[0109] The first formula may include:

[0110]

[0111] Among them, N1h is the adjusted printing pressure, V 1h is the adjusted printing speed, D 1h is the adjusted screen spacing; N q is the printing pressure at the current moment, V q is the current printing speed, D q is the screen spacing at the current moment; m t is the wet weight of printing at the current moment, w t is the current grid line width, h t is the grid line height at the current moment; m0 is the reference printing wet weight, w0 is the reference grid line width, h0 is the reference grid line height; α1, α2, α3, β1, β2, β3, γ1, γ2, γ3 are all adjustment coefficients.

[0112] In a possible implementation, the second adjustment unit may be specifically used to adjust the printing pressure, screen spacing and printing speed according to the current printing pressure, the current screen spacing, the current printing speed, the current slurry viscosity and the current screen tension in combination with the second formula;

[0113] The second formula may include:

[0114]

[0115] Among them, N 2h is the adjusted printing pressure, V 2h Adjusted printing speed, D 2h is the adjusted screen spacing; N q is the printing pressure at the current moment, V q is the current printing speed, D q is the screen spacing at the current moment; η t is the slurry viscosity at the current moment, T t is the screen tension at the current moment; η0 is the reference slurry viscosity, T0 is the reference screen tension; φ1, φ2, φ3, λ1, λ2, λ3 are all adjustment coefficients.

[0116] In a possible implementation, the second parameter adjustment module 23 may include:

[0117] The third adjustment unit is used to adjust the scraper contact angle according to the current slurry viscosity and the current printing wet weight if the change in slurry viscosity is greater than the fourth change or the change in printing wet weight is greater than the first change since the last parameter adjustment.

[0118] In a possible implementation, the third adjustment unit may be specifically used to: adjust the scraper contact angle according to the current slurry viscosity, the current printing wet weight and the current scraper contact angle in combination with the third formula;

[0119] The third formula may include:

[0120]

[0121] Among them, θ h is the adjusted scraper contact angle, θ q is the scraper contact angle at the current moment, m t is the wet weight of printing at the current moment, μ t is the slurry viscosity at the current moment, and m0 is the reference printing wet weight.

[0122] In a possible embodiment, the slurry viscosity is detected by a viscometer arranged on the scraper;

[0123] The screen tension is detected by the pressure sensor arranged on the scraper;

[0124] The grid line width and grid line height are detected by image monitoring equipment;

[0125] The wet weight of the printed material is measured and calculated by the weight detection equipment installed before and after the printing machine.

[0126] Figure 7 Schematic diagram of the control terminal 3 provided in the embodiment of the present invention. Figure 7 As shown, the control terminal 3 of this embodiment includes: a processor 30 and a memory 31. The memory 31 is used to store a computer program 32, and the processor 30 is used to call and run the computer program 32 stored in the memory 31 to execute the steps in the above-mentioned embodiments of the automatic control method of the solar printing device, such as Figure 4 Alternatively, the processor 30 is used to call and run the computer program 32 stored in the memory 31 to implement the functions of each module / unit in the above-mentioned device embodiments, such as Figure 6 The functions of modules 21 to 23 are shown.

[0127] Exemplarily, the computer program 32 may be divided into one or more modules / units, one or more modules / units are stored in the memory 31 and executed by the processor 30 to implement the present invention. One or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program 32 in the control terminal 3. For example, the computer program 32 may be divided into Figure 6 Modules / units 21 to 23 are shown.

[0128] The control terminal 3 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The control terminal 3 may include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will appreciate that Figure 7 It is only an example of the control terminal 3 and does not constitute a limitation on the control terminal 3. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal may also include input and output devices, network access devices, buses, etc.

[0129] The processor 30 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0130] The memory 31 may be an internal storage unit of the control terminal 3, such as a hard disk or memory of the control terminal 3. The memory 31 may also be an external storage device of the control terminal 3, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the control terminal 3. Further, the memory 31 may also include both an internal storage unit of the control terminal 3 and an external storage device. The memory 31 is used to store computer programs and other programs and data required by the terminal. The memory 31 may also be used to temporarily store data that has been output or is to be output.

[0131] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0132] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0133] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0134] In the embodiments provided by the present invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0135] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0136] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0137] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0138] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A solar printing equipment automatic control method, characterized in that: include: Obtain printing wet weight, grid line width, grid line height, slurry viscosity and screen tension; Adjusting the printing pressure, screen spacing and printing speed according to at least one of the printing wet weight, the grid line width, the grid line height, the slurry viscosity and the screen tension; The contact angle of the scraper is adjusted according to the wet weight of the printing and the viscosity of the slurry.

2. The automatic control method of solar printing equipment according to claim 1, characterized in that: The step of adjusting the printing pressure, screen spacing and printing speed according to at least one of the printing wet weight, the grid line width, the grid line height, the slurry viscosity and the screen tension comprises: Since the last parameter adjustment, if the change in the printed wet weight is greater than the first change, the change in the grid line height is greater than the second change, or the change in the grid line width is greater than the third change, the printing pressure, the screen spacing, and the printing speed are adjusted according to the current printed wet weight, the current grid line width, and the current grid line height; Starting from the last parameter adjustment, if the change in the slurry viscosity is greater than the fourth change or the screen tension is greater than the fifth change, the printing pressure, the screen spacing and the printing speed are adjusted according to the current slurry viscosity and the current screen tension.

3. The automatic control method of solar printing equipment according to claim 2, characterized in that: The step of adjusting the printing pressure, the screen spacing and the printing speed according to the current printing wet weight, the current grid line width and the current grid line height comprises: According to the current printing pressure, the current screen spacing, the current printing speed, the current printing wet weight, the current grid line width and the current grid line height, the printing pressure, the screen spacing and the printing speed are adjusted in combination with the first formula; The first formula includes: Among them, N 1h is the adjusted printing pressure, V 1h is the adjusted printing speed, D 1h is the adjusted screen spacing; N q is the printing pressure at the current moment, V q is the current printing speed, D q is the screen spacing at the current moment; m t is the wet weight of printing at the current moment, w t is the current grid line width, h t is the grid line height at the current moment; m0 is the reference printing wet weight, w0 is the reference grid line width, h0 is the reference grid line height; α1, α2, α3, β1, β2, β3, γ1, γ2, γ3 are all adjustment coefficients.

4. The automatic control method of solar printing equipment according to claim 2, characterized in that: The step of adjusting the printing pressure, the screen spacing and the printing speed according to the current slurry viscosity and the current screen tension comprises: According to the current printing pressure, the current screen spacing, the current printing speed, the current slurry viscosity and the current screen tension, the printing pressure, the screen spacing and the printing speed are adjusted in combination with the second formula; The second formula includes: Among them, N 2h is the adjusted printing pressure, V 2h Adjusted printing speed, D 2h is the adjusted screen spacing; N q is the printing pressure at the current moment, V q is the current printing speed, D q is the screen spacing at the current moment; η t is the slurry viscosity at the current moment, T t is the screen tension at the current moment; η0 is the reference slurry viscosity, T0 is the reference screen tension; φ1, φ2, φ3, λ1, λ2, λ3 are all adjustment coefficients.

5. The automatic control method of solar printing equipment according to claim 1, characterized in that: The step of adjusting the contact angle of the scraper according to the wet weight of the printing and the viscosity of the slurry includes: Starting from the last parameter adjustment, if the change in the slurry viscosity is greater than the fourth change or the change in the printed wet weight is greater than the first change, the scraper contact angle is adjusted according to the current slurry viscosity and the current printed wet weight.

6. The automatic control method of solar printing equipment according to claim 5, characterized in that: The step of adjusting the scraper contact angle according to the current slurry viscosity and the current printing wet weight comprises: According to the current slurry viscosity, the current printing wet weight and the current scraper contact angle, the scraper contact angle is adjusted in combination with the third formula; The third formula includes: Among them, θ h is the adjusted scraper contact angle, θ q is the scraper contact angle at the current moment, m t is the wet weight of printing at the current moment, μ t is the slurry viscosity at the current moment, and m0 is the reference printing wet weight.

7. The automatic control method of solar printing equipment according to any one of claims 1 to 6, characterized in that: The slurry viscosity is detected by a viscometer arranged on the scraper; The wire mesh tension is detected by a pressure sensor arranged on the scraper; The grid line width and the grid line height are detected by an image monitoring device; The printed wet weight is measured and calculated by weight detection equipment arranged before and after the printing machine.

8. An automatic control device for solar printing equipment, characterized in that: include: Data monitoring module, used to obtain printing wet weight, grid line width, grid line height, slurry viscosity and screen tension; A first parameter adjustment module, for adjusting the printing pressure, screen spacing and printing speed according to at least one of the printing wet weight, the grid line width, the grid line height, the slurry viscosity and the screen tension; The second parameter adjustment module is used to adjust the scraper contact angle according to the printing wet weight and the slurry viscosity.

9. A control terminal, characterized in that: It comprises a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the steps of the automatic control method of solar printing equipment as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the automatic control method of solar printing equipment as described in any one of claims 1 to 7 are implemented.

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