Screen printing device

Abstract

The utility model discloses a screen printing device. The silk-screen printing device comprises a screen printing plate, a mounting base, a printing assembly, a slurry detection device and a control system. The screen printing plate comprises a first end and a second end which are oppositely arranged in the first direction. The mounting base is slidably arranged above the screen in the first direction, the printing assembly comprises a scraper and an ink return blade which are arranged on the mounting base, the ink return blade is used for laying slurry from the first end of the screen to the second end of the screen, and the scraper is used for extruding the slurry from the second end of the screen to the first end of the screen. The ink reclaiming knife is adjustably arranged in the direction perpendicular to the screen printing plate; the slurry detection device is used for measuring the residual slurry at the first end of the screen printing plate; the slurry detection device is electrically connected with the control system, the control system can control the ink return knife to be adjusted in the direction perpendicular to the screen printing plate according to the residual amount of slurry measured by the slurry detection device, and the problems that quality abnormities such as printing grid breaking, virtual printing and local through printing or the slurry overflows to a non-printing area, waste is caused, and cleaning is inconvenient are solved.

Description

Technical Field

[0001] This application relates to the technical field of screen printing machines, and particularly to a screen printing device. Background Art

[0002] Currently, the way of screen printing is that the doctor blade needs to evenly cover the paste on the screen plate, and then the paste is printed on the silicon wafer through the mesh holes of the screen plate by the movement of the squeegee in a squeezing manner. Generally, the height of the doctor blade is fixed. However, due to the different amounts of paste in the screen plate, there will be some differences in the ink return effect at the same height. If the height of the doctor blade is too high, it is easy to cause abnormal ink return of the paste, local hollowing, etc., resulting in quality abnormalities such as printing broken grids, virtual printing, and local missing printing. If the height of the doctor blade is too low, it is easy to cause the paste to overflow to the non-printing area, resulting in an increase in dry paste, causing waste and being inconvenient to clean. The existing method of adjusting the height of the doctor blade is to manually and passively adjust according to experience when abnormalities occur during the production process. This method is prone to batch printing defects due to the failure to detect abnormalities in time. In addition, different people have different judgment and debugging bases, and multiple attempts at adjustment are required, causing inconvenience. Utility Model Content

[0003] This application discloses a screen printing device, which can accurately adjust the height of the doctor blade according to the remaining amount of paste, so that the ink return quality of the doctor blade is always good, avoiding quality abnormalities such as printing broken grids, virtual printing, and local missing printing, or causing the paste to overflow to the non-printing area, resulting in an increase in dry paste, causing waste and being inconvenient to clean, etc.

[0004] To achieve the above object, this application discloses a screen printing device, including:

[0005] A screen plate, the screen plate includes a first end and a second end oppositely arranged in a first direction;

[0006] A mounting seat, the mounting seat is slidably arranged above the screen plate along the first direction;

[0007] A printing assembly, the printing assembly includes a squeegee and a doctor blade arranged on the mounting seat. The doctor blade is used to lay the paste from the first end of the screen plate to the second end of the screen plate, and the squeegee is used to squeeze the paste from the second end of the screen plate to the first end of the screen plate. The doctor blade is also adjustable along a direction perpendicular to the screen plate;

[0008] A paste detection device, the paste detection device is used to measure the remaining amount of paste at the first end of the screen plate;

[0009] A control system, the paste detection device is electrically connected to the control system, and the control system can control the doctor blade to be adjusted along a direction perpendicular to the screen plate according to the remaining amount of paste measured by the paste detection device.

[0010] In the first possible implementation manner, the slurry detection device includes a first laser emitter, which is arranged above the screen printing stencil, and the first laser emitter is used to measure the volume of the remaining slurry at the first end of the screen printing stencil.

[0011] In the first possible implementation manner, the screen printing device further includes a second laser emitter, which is used to measure the thickness of the slurry laid by the doctor blade, and the second laser emitter is electrically connected to the control system.

[0012] In the first possible implementation manner, the second laser emitter is slidably arranged above the screen printing stencil along the first direction.

[0013] In the first possible implementation manner, the second laser emitter is arranged on the side of the mounting base facing the screen printing stencil.

[0014] In the first possible implementation manner, the first laser emitter is arranged on the side of the mounting base facing the screen printing stencil.

[0015] In the first possible implementation manner, the first laser emitter is arranged between the squeegee and the doctor blade along the first direction.

[0016] In the first possible implementation manner, the second laser emitter is arranged on the side of the doctor blade close to the first end of the screen printing stencil.

[0017] In the first possible implementation manner, the control system includes a first alarm module and a second alarm module. When the control system determines that the remaining slurry detected by the first laser emitter is greater than the set maximum value or less than the set minimum value, the first alarm module issues an alarm. When the control system determines that the abnormal thickness detected by the second laser emitter exceeds the set number of times within the set time, the second alarm module issues an alarm.

[0018] In the first possible implementation manner, a motor and a lead screw nut mechanism are provided on the mounting base. The driving lead screw of the lead screw nut mechanism is connected to the motor, and the driving lead screw is arranged in a direction perpendicular to the screen printing stencil. The doctor blade is fixedly arranged on the moving nut of the lead screw nut mechanism, so that the doctor blade is adjustable along a direction perpendicular to the screen printing stencil.

[0019] Compared with the prior art, the beneficial effects of this application are as follows:

[0020] In the present application, the ink-return blade of the screen printing device is used to lay the paste from the first end of the screen plate to the second end of the screen plate, and the squeegee is used to extrude the paste from the second end of the screen plate to the first end of the screen plate. The screen printing device is provided with a paste detection device for detecting the remaining amount of the paste. The ink-return blade is also adjustable in the direction perpendicular to the screen plate. Then, the remaining amount of the paste at the first end of the screen plate is measured by the paste detection device and fed back to the control system. The control system can control the adjustment of the ink-return blade in the direction perpendicular to the screen plate according to the remaining amount of the paste. In this way, the distance between the ink-return blade and the screen plate can be accurately adjusted according to the remaining amount of the paste, which not only makes the adjustment more accurate, but also can be adjusted in time without manual operation, so that the ink-return quality of the ink-return blade is always good, and abnormal situations such as uneven ink return of the paste and local hollowing out will not occur, thus causing quality abnormalities such as printing broken grids, virtual printing, and local missing printing, or causing the paste to overflow into the non-printing area, resulting in an increase in dry paste, waste, and inconvenience in cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 FIG. is a schematic structural diagram of a screen printing device provided by an embodiment of the present invention;

[0023] Figure 2 FIG. is a schematic structural diagram of a mounting seat of a screen printing device provided by an embodiment of the present invention.

[0024] DESCRIPTION OF THE REFERENCE NUMERALS

[0025] 10 - screen plate; 11 - first end; 12 - second end; 20 - printing assembly; 21 - ink-return blade; 22 - squeegee; 30 - first laser emitter; 31 - laser scanning area; 40 - second laser emitter; 41 - laser scanning line; 50 - mounting seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0027] In this application, the terms "installed", "set up", "provided with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components, or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components, or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0029] Screen printing is a common printing technique with a wide range of application fields and unique advantages. By stretching a screen tightly on a screen frame, a screen plate with patterns or text is made. Currently, in the way of screen printing, a doctor blade is required to evenly cover the paste on the screen plate, and then the paste is printed on the silicon wafer through the mesh holes of the screen plate by the movement of a squeegee in a squeezing manner. Generally, the height of the doctor blade is fixed. However, due to the different amounts of paste in the screen plate, there will be some differences in the ink-return effect at the same height. If the height of the doctor blade is too high, it is easy to cause abnormal situations such as uneven ink return of the paste and local hollowing, resulting in quality abnormalities such as broken grids, virtual printing, and local missing printing during printing. If the height of the doctor blade is too low, it is easy to cause the paste to overflow to non-printing areas, resulting in an increase in dry paste, causing waste and being inconvenient to clean. The existing method of adjusting the height of the doctor blade is to manually and passively adjust it according to experience when abnormalities occur during the production process. This method is prone to batch printing defects due to the failure to detect abnormalities in time. In addition, different people have different judgment and debugging bases, and multiple attempts at adjustment are required, causing inconvenience.

[0030] In view of this, some embodiments of this application provide a screen printing device that can avoid quality abnormalities such as broken grids, virtual printing, and local missing printing during printing, or prevent the paste from overflowing to non-printing areas, resulting in an increase in dry paste, causing waste and being inconvenient to clean.

[0031] The following provides a detailed description of this application through specific embodiments:

[0032] The screen printing device according to the embodiments of this application, such as Figure 1As shown, it includes a stencil 10, a mounting base 50, a printing assembly 20, a paste detection device, and a control system. The stencil 10 includes a first end 11 and a second end 12 that are oppositely arranged in the first direction (the illustrated X direction is the first direction). The mounting base 50 is slidably arranged above the stencil 10 in the first direction. The printing assembly 20 includes a squeegee 22 and a doctor blade 21. The squeegee 22 and the doctor blade 21 are arranged on the mounting base 50 so that the squeegee 22 and the doctor blade 21 slide above the stencil 10 in the first direction. The doctor blade 21 is used to lay the paste from the first end 11 of the stencil 10 to the second end 12 of the stencil 10. The squeegee 22 is used to squeeze the paste from the second end 12 of the stencil 10 to the first end 11 of the stencil 10. The doctor blade 21 is also adjustable in the direction perpendicular to the stencil 10. The paste detection device is used to measure the remaining amount of paste at the first end 11 of the stencil 10. The paste detection device is electrically connected to the control system. The control system can control the doctor blade to adjust in the direction perpendicular to the stencil 10 according to the remaining amount of paste measured by the paste detection device.

[0033] In the screen printing device provided by the embodiment of the present application, the doctor blade 21 of the screen printing device is used to lay the paste from the first end 11 of the stencil 10 to the second end 12 of the stencil 10, and the squeegee 22 is used to squeeze the paste from the second end 12 of the stencil 10 to the first end 11 of the stencil 10. The screen printing device is provided with a paste detection device for detecting the remaining amount of paste. The doctor blade 21 is also adjustable in the direction perpendicular to the stencil 10. Then, the remaining amount of paste at the first end 11 of the stencil 10 is measured by the paste detection device and fed back to the control system. The control system can control the doctor blade 21 to adjust in the direction perpendicular to the stencil 10 according to the remaining amount of paste, so as to accurately adjust the distance between the doctor blade 21 and the stencil 10 according to the remaining amount of paste. This not only makes the adjustment more accurate, but also can be adjusted in time without manual operation. Specifically, the control system can be configured with multiple remaining paste amount intervals, and different distances between the doctor blade 21 and the stencil 10 correspond to the multiple remaining paste amount intervals, so as to accurately adjust the height of the doctor blade 21 according to the remaining amount of paste, ensuring that the ink-return quality of the doctor blade 21 is always good, and abnormal situations such as uneven ink return of the paste and local hollowing will not occur, which may lead to quality abnormalities such as broken grids, virtual printing, and local missing printing during printing, or cause the paste to overflow to non-printing areas, resulting in an increase in dry paste, waste, and inconvenience in cleaning.

[0034] The slurry detection device can have various implementation manners. In this embodiment, the slurry detection device includes a first laser emitter 30, which is arranged above the screen printing stencil 10. The first laser emitter 30 is used to measure the volume of the slurry remaining at the first end 11 of the screen printing stencil 10. Then, the control system is configured with a series of continuous volume ranges of the slurry remaining. These multiple volume ranges of the slurry remaining correspond to different distances between the doctor blade 21 and the screen printing stencil 10. When the volume is in a smaller range, the corresponding distance between the doctor blade 21 and the screen printing stencil 10 is also smaller, making the height of the doctor blade 21 lower, ensuring that the returned slurry is evenly distributed and there is no local hollowing. When the volume is larger, the corresponding distance between the doctor blade 21 and the screen printing stencil 10 is also larger, making the height of the doctor blade 21 higher, ensuring that the laid slurry does not overflow the printing area.

[0035] When the first laser emitter 30 measures the volume, the laser scanning area 31 emitted by the first laser emitter 30 is as Figure 1 shown. Then, the first laser emitter 30 scans towards the first end 11 of the screen printing stencil 10. By irradiating the outer periphery of the slurry remaining, a three-dimensional contour of the slurry remaining is constructed, and then the volume of the slurry remaining is calculated. First, measuring the volume of the slurry remaining at the first end 11 of the screen printing stencil 10 by the first laser emitter 30 can achieve high-precision measurement. Laser has extremely high directivity and monochromaticity, enabling very precise measurement and accurately detecting tiny changes in the slurry volume. Second, laser measurement is a non-contact measurement. Laser measurement does not directly contact the slurry, avoiding interference and contamination to the measurement object, and also will not damage the slurry or the measuring device. Moreover, the propagation speed of laser is extremely fast, enabling rapid measurement to be completed in a short time, improving the detection efficiency and being suitable for on-line real-time detection. In a large-scale production line such as screen printing, it can quickly obtain the volume data of the slurry remaining and timely adjust the height of the doctor blade 21. Also, laser measurement can work under various environmental conditions, including harsh environments such as high temperature, high pressure, and strong electromagnetic fields, with good stability and reliability. Finally, laser measurement can be easily integrated with other automated devices and control systems to achieve intelligent production and quality control. In a fully automated production line such as screen printing, the laser measurement data can be directly input into the control system to achieve automatic adjustment and optimization.

[0036] In another possible implementation manner, the slurry detection device includes a weight detection device. A weight detection device is arranged below the position of the slurry remaining at the first end 11 of the screen printing stencil 10. The weight detection device is electrically connected to the control system. Whenever the slurry is moved to this position, the weight detection device detects the weight of the slurry remaining. The control system is configured with a series of continuous weight ranges of the slurry remaining. These multiple weight ranges of the slurry remaining correspond to different distances between the doctor blade 21 and the screen printing stencil 10.

[0037] Further, the screen printing device further includes a second laser emitter 40 for measuring the thickness of the paste laid by the doctor blade 21. The second laser emitter 40 is electrically connected to the control system. The laser scanning line emitted by the second laser emitter 40 is as Figure 1 shown. The second laser emitter 40 can irradiate the surface of the paste after the paste is laid, and measure the thickness of the laid paste through the height difference from the screen 10. During the screen printing process, the thickness of the paste laid by the doctor blade 21 needs to be maintained within a specific thickness range, which can ensure good printing quality during the extrusion of the paste by the squeegee 22. Therefore, the control system is configured with a paste thickness range. By measuring the paste thickness with the second laser emitter 40, it is detected whether the paste thickness is within the paste thickness range, and it is judged whether the paste thickness is abnormal. If it is abnormal, the control system needs to further adjust the setting between the paste allowance and the height of the doctor blade 21 to ensure that the thickness of the paste laid by the doctor blade 21 is maintained within a specific thickness range.

[0038] Specifically, in order to obtain a more comprehensive paste thickness, the second laser emitter 40 is slidably arranged above the screen 10 along the first direction. Since the paste laid by the doctor blade 21 is distributed on the entire screen 10, sliding the second laser emitter 40 above the screen 10 along the first direction can measure the paste thickness at different positions on the screen 10, comprehensively understand the thickness of each area, rather than just a part, and can obtain the data of the paste thickness in real time, which is convenient for timely detecting thickness abnormalities, thereby timely optimizing and adjusting the height of the doctor blade 21 to ensure the consistency of product quality. On a continuously produced printing line, it can immediately detect that the paste thickness in a certain section is insufficient and stop production in time for adjustment. In another possible implementation, the second laser emitter 40 can also be rotatably arranged at a fixed position above the screen 10, and can also measure the paste thickness at different positions on the screen 10.

[0039] In this embodiment, the printing assembly 20 and the second laser emitter 40 are arranged on the side of the mounting base 50 facing the stencil 10. In this way, the second laser emitter 40 can timely feedback the measured paste thickness data following the laying of the doctor blade 21. Moreover, this integrated design makes the structure of the whole device more compact, and is convenient for overall installation, debugging and maintenance. The laying process and thickness measurement can be carried out at the same position and at the same time, realizing the synchronization of operations, being able to immediately measure the paste thickness during the paste laying process, timely obtain the feedback of the printing effect, so as to quickly make adjustments. Once a thickness deviation is found, printing can be immediately stopped and corrected, improving the measurement accuracy. Since the position of the second laser emitter 40 is relatively fixed with respect to the printing assembly 20, the position for measuring the paste thickness is very close to the printing position, reducing the measurement error caused by the position difference, improving the accuracy and reliability of the measurement, eliminating the need for a separate measurement station, saving space and time on the production line, improving the production efficiency, and reducing the occupied space.

[0040] Furthermore, the first laser emitter 30 is arranged on the side of the mounting base 50 facing the stencil 10. In this way, the key components are concentrated on the same side of the mounting base 50, making the structure of the whole screen printing device more compact and integrated, which helps to reduce the overall size, save the installation space, and is more convenient in terms of equipment layout and transportation; at the same time, the printing assembly 20, the first laser emitter 30 and the second laser emitter 40 are all on the mounting base 50. The volume of the paste residue is measured by the first laser emitter 30, and the paste thickness is measured by the second laser emitter 40, providing immediate and comprehensive feedback for the printing operation, and being able to achieve more collaborative work; since all the measurement and printing operations are carried out under a relatively fixed positional relationship, the errors caused by the measurement position difference or the relative movement between components are reduced, which helps to improve the accuracy of measurement and printing, and ensure the stability and consistency of product quality; the centralized layout of each component enhances the stability and reliability of the whole device, reduces the complexity of the connection lines and transmission mechanisms, reduces the probability of failure, and reduces the maintenance and repair costs.

[0041] In this embodiment, before laying the paste, the doctor blade 21 is at the first end 11 of the stencil 10. After the squeegee 22 moves and squeezes, it returns to the first end 11 of the stencil 10. The first laser emitter 30 measures the volume of the paste residue at the first end 11 of the stencil 10 before the doctor blade 21 lays the paste and after the squeegee 22 moves and squeezes. When the mounting base 50 is at the position of the first end 11 of the stencil 10, the paste residue is between the doctor blade 21 and the squeegee 22. Therefore, as Figure 2As shown, the first laser emitter 30 is arranged between the squeegee 22 and the doctor blade 21 in the first direction, which can facilitate and accurately measure, thereby improving the measurement accuracy. Moreover, during the printing process, the first laser emitter 30 can measure in a timely manner, so as to adjust according to the remaining amount of the paste in a timely manner, thereby improving the production efficiency and product quality.

[0042] To achieve the timely measurement of the paste thickness, as Figure 2 shown, the second laser emitter 40 is arranged on one side of the first end 11 of the doctor blade 21 close to the stencil 10. The second laser emitter 40 can measure the paste thickness on the stencil 10 in a timely manner during the laying process of the doctor blade 21. At this time, more accurate paste thickness data can be obtained through measurement, which is fed back to the control system in a timely manner to judge whether the paste thickness is abnormal in a timely manner. Understanding the paste thickness in a timely manner can reduce printing defects caused by uneven paste thickness, thereby reducing the scrap rate and the number of reworks, better controlling the printing quality, improving the production efficiency, and improving the quality and reliability of the product.

[0043] Specifically, the control system includes a first alarm module and a second alarm module. The maximum value and the minimum value are set for the remaining amount of the paste in the control system. When the control system judges that the remaining amount of the paste detected by the first laser emitter 30 is greater than the set maximum value or less than the set minimum value, the first alarm module issues an alarm. When the remaining amount of the paste is greater than the set maximum value, it is displayed on the operation screen that the paste addition exceeds the upper limit. When the remaining amount of the paste is less than the set minimum value, it is displayed on the operation screen that the remaining amount of the paste is lower than the lower limit, so that the operator can make adjustments in a timely manner. For the paste thickness detected by the second laser emitter 40, if the same abnormality exceeds the set number of times within the set time, the second alarm module issues an alarm. Exemplarily, if the paste thickness abnormality of the same doctor blade 21 height exceeds 5 times within the unit time (10 minutes), the second alarm module automatically alarms and displays on the machine screen that the same abnormality appears repeatedly. At this time, manual optimization and adjustment are required. The height of the doctor blade 21 corresponding to the remaining amount of the paste is reset, and the adjustment method is supplemented into the adjustment program according to the adjustment result.

[0044] In this embodiment, since the doctor blade 21 is adjustable in the direction perpendicular to the screen plate 10, a motor and a lead screw nut mechanism are provided on the mounting base 50. The driving lead screw of the lead screw nut mechanism is connected to the motor and arranged in the direction perpendicular to the screen plate 10. The doctor blade 21 is fixedly arranged on the moving nut of the lead screw nut mechanism. By driving the lead screw nut mechanism with the motor, the doctor blade 21 can be adjusted in the direction perpendicular to the screen plate 10, and the adjustment accuracy is high. In another possible implementation manner, a cylinder and a telescopic rod arranged in the direction perpendicular to the screen plate 10 can be provided on the mounting base 50. One end of the telescopic rod is connected to the cylinder, and the other end of the telescopic rod is connected to the doctor blade 21, so that the doctor blade 21 can be adjusted by the telescopic movement of the telescopic rod. The cylinder and the telescopic rod are used to push the doctor blade 21 to move up and down, and the response speed is fast and the maintenance is simple. Of course, in order to realize the adjustable setting of the doctor blade 21 in the direction perpendicular to the screen plate 10, a gear rack mechanism, an electric push rod mechanism or a crank slider mechanism can also be used, which is not limited here.

[0045] When the screen printing device of this embodiment is in use, the doctor blade 21 of the screen printing device is used to lay the paste from the first end 11 of the screen plate 10 to the second end 12 of the screen plate 10, and the squeegee 22 is used to extrude the paste from the second end 12 of the screen plate 10 to the first end 11 of the screen plate 10. The screen printing device is provided with a paste detection device for detecting the remaining amount of the paste. The doctor blade 21 is also adjustable in the direction perpendicular to the screen plate 10. Then, the remaining amount of the paste at the first end 11 of the screen plate 10 is measured by the paste detection device and fed back to the control system. The control system can control the adjustment of the doctor blade 21 in the direction perpendicular to the screen plate 10 according to the remaining amount of the paste. In this way, the distance between the doctor blade 21 and the screen plate 10 can be accurately adjusted according to the remaining amount of the paste, which not only makes the adjustment more accurate, but also can be adjusted in time without manual operation, so that the ink return quality of the doctor blade 21 is always good, and abnormal situations such as uneven ink return of the paste and local hollowing out will not occur, resulting in quality abnormalities such as printing broken grids, virtual printing, and local missing printing, or causing the paste to overflow to the non-printing area, resulting in an increase in dry paste, waste and inconvenience in cleaning.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A screen printing device, characterized in that, Comprising: A stencil, the stencil including a first end and a second end oppositely arranged in a first direction; A mounting seat, the mounting seat being slidably arranged above the stencil in the first direction; A printing assembly, the printing assembly including a squeegee and a flood blade arranged on the mounting seat, the flood blade being used for laying a slurry from the first end of the stencil to the second end of the stencil, the squeegee being used for extruding the slurry from the second end of the stencil to the first end of the stencil, and the flood blade being further adjustable in a direction perpendicular to the stencil; A slurry detection device, the slurry detection device being used for measuring the remaining amount of slurry at the first end of the stencil; A control system, the slurry detection device being electrically connected to the control system, and the control system being capable of controlling the flood blade to be adjusted in a direction perpendicular to the stencil according to the remaining amount of slurry measured by the slurry detection device.

2. The screen printing apparatus according to claim 1, wherein The slurry detection device includes a first laser emitter, the first laser emitter being arranged above the stencil, and the first laser emitter being used for measuring the volume of the remaining amount of slurry at the first end of the stencil.

3. The screen printing device according to claim 2, characterized in that, The screen printing device further includes a second laser emitter, the second laser emitter being used for measuring the thickness of the slurry laid by the flood blade, and the second laser emitter being electrically connected to the control system.

4. The screen printing device according to claim 3, characterized in that, The second laser emitter is slidably arranged above the stencil in the first direction.

5. The screen printing device according to claim 4, characterized in that The second laser emitter is arranged on a side of the mounting seat facing the stencil.

6. The screen printing apparatus according to claim 5, wherein, The first laser emitter is arranged on a side of the mounting seat facing the stencil.

7. The screen printing apparatus according to claim 4, characterized in that, The first laser emitter is arranged between the squeegee and the flood blade in the first direction.

8. The screen printing device according to claim 5, characterized in that, The second laser emitter is arranged on a side of the flood blade close to the first end of the stencil.

9. The screen printing apparatus according to any one of claims 1-8, characterized in that, The control system includes a first alarm module and a second alarm module. When the control system determines that the remaining amount of slurry detected by the first laser emitter is greater than a set maximum value or less than a set minimum value, the first alarm module gives an alarm. When the control system determines that the thickness abnormality detected by the second laser emitter exceeds a set number of times within a set time, the second alarm module gives an alarm.

10. The screen printing device according to any one of claims 1-8, characterized in that, A motor and a lead screw nut mechanism are arranged on the mounting seat, a driving lead screw of the lead screw nut mechanism is connected to the motor, the driving lead screw is arranged in a direction perpendicular to the stencil, and the flood blade is fixedly arranged on a moving nut of the lead screw nut mechanism, so that the flood blade is adjustable in a direction perpendicular to the stencil.

Images