Photovoltaic silver paste doctor blade integrated with a doctor blade fineness meter

Abstract

The utility model discloses a photovoltaic silver paste scraper of integrated scraper fineness meter, and the scraper includes scraper body and the scraper fineness meter module of setting at its end, and the fineness meter baseplate of scraper fineness meter module is equipped with the wedge-shaped groove of depth gradual change, and the groove both ends are connected respectively and enter the paste mouth and the paste mouth of going out. The present application integrates the fineness detection function in the scraper body, and the silver paste fineness measurement is completed simultaneously in the blade coating operation, realizes the on -line real -time nondestructive monitoring. In this kind of detection mode, the detection paste comes directly from the working paste, can truly reflect the blade coating working condition, and need not stop sampling, improves production efficiency and product yield. The present application effectively solves the problem of poor timeliness, insufficient representation and influence production in the existing offline detection, and is suitable for quality control in photovoltaic silver paste screen printing process.

Description

Technical Field

[0001] This utility model relates to a photovoltaic silver paste scraper with an integrated scraper fineness gauge. Background Technology

[0002] In the production of photovoltaic cells, silver paste, as an electrode material, directly determines the cell's conductivity and photoelectric conversion efficiency. The fineness of the silver paste is a key indicator of its quality. If the silver paste is not fine enough, it can lead to problems such as broken lines and incomplete printing during the printing process, resulting in poor conductivity after sintering and affecting the overall performance of the cell.

[0003] Currently, the industry generally uses offline sampling and testing methods to test the fineness of silver paste: a small amount of silver paste sample is taken from the paste container, manually scraped and coated using a separate scraper fineness meter, and then visually inspected, with readings taken from areas where particles are concentrated, thus obtaining the fineness index. However, this traditional testing method has many drawbacks:

[0004] First, it lacks timeliness and cannot reflect the real-time state of the paste during actual application with a doctor blade. During long-term operation, the fineness of the silver paste may change due to solvent evaporation or particle agglomeration, and offline detection cannot capture such changes in a timely manner.

[0005] Second, the representativeness is insufficient. Fixed sampling points cannot fully reflect the uniformity of silver paste in the entire slurry system, and the test results are one-sided.

[0006] Third, it affects production efficiency. The sampling process requires interrupting the production process, which not only reduces equipment utilization but may also cause silver paste contamination and waste.

[0007] Therefore, there is an urgent need for a device that can monitor the fineness of silver paste online and in real time, so as to achieve immediate feedback and control of paste quality and solve the shortcomings of existing technologies. Utility Model Content

[0008] The purpose of this invention is to provide a photovoltaic silver paste scraper with an integrated scraper fineness gauge, solving the problems of existing offline silver paste fineness detection methods, which suffer from detection lag, inability to reflect actual scraping conditions, and reduced production efficiency. This invention enables simultaneous scraping operations and fineness detection, achieving online real-time monitoring. The specific technical solution is as follows:

[0009] A photovoltaic silver paste scraper with an integrated scraper fineness gauge includes a scraper body, the scraper body including a scraper blade for scraping silver paste onto a screen template, and a scraper fineness gauge module is provided at at least one end of the scraper body.

[0010] The scraper fineness gauge module includes one or more parallel wedge-shaped grooves, the depth of which gradually decreases from the starting end to the tail end. The starting end is provided with a slurry inlet, and the tail end is provided with a slurry outlet.

[0011] Furthermore, the wedge-shaped groove is parallel to the direction of the scraper's movement. As the scraper moves forward, the silver paste flows from the inlet into the wedge-shaped groove. This design requires no additional drive or manual intervention; the silver paste naturally flows into the groove as the scraper moves, achieving dynamic synchronization between the scraping operation and fineness detection. It can instantly capture the true state of the silver paste under the current scraping conditions, effectively avoiding the lag problem of traditional static detection.

[0012] Furthermore, the wedge-shaped groove is perpendicular to the direction of the scraper's advance. When testing is required, the silver paste at the scraper's edge is scraped into the wedge-shaped groove using an auxiliary scraper. The auxiliary scraper can accurately obtain the real-time paste at the scraper's edge, ensuring that the sample comes from the actual working area and that the data is highly representative.

[0013] Furthermore, the fineness gauge substrate next to the wedge-shaped groove is engraved with scale lines for reading fineness values. Operators can directly observe the position where the silver paste particles stop to read the values ​​without the need for additional tools, which improves the convenience of reading, reduces human error, and ensures the accuracy of the test data.

[0014] Furthermore, the scraper fineness gauge module is detachably connected to the scraper body via bolts, snap-fit ​​connections, or interference fits. This detachable design facilitates subsequent cleaning, calibration, or replacement of the module, adapting to maintenance needs after high-frequency use. It also allows for flexible matching with scraper bodies of different specifications, reducing the overall replacement cost of the equipment.

[0015] Furthermore, the scraper fineness gauge module and the scraper body are an integrated structure. This integrated design avoids the loosening problems that may occur with detachable connections, improves the overall structural stability, adapts to high-frequency, long-term scraping operations, reduces detection errors caused by module displacement, and ensures the consistency of detection data.

[0016] Furthermore, a scraper handle is provided at the tail of the scraper body. The handle provides a suitable gripping point for operation, facilitating precise control of the scraper's direction, force, and speed. It also improves the stability of the scraping process, indirectly ensuring the uniformity of the silver paste coating and the reliability of the test data.

[0017] Furthermore, the depth range of the wedge-shaped groove is 0-50 μm. This depth range precisely matches the common fineness range of photovoltaic silver paste, which can not only fully cover the fineness requirements of normal silver paste production, but also clearly distinguish the stopping positions of particles of different sizes, avoiding detection blind spots.

[0018] The beneficial effects of this utility model are as follows:

[0019] Unlike existing static fineness testing methods, the wedge-shaped groove of this integrated scraper fineness gauge module moves dynamically and synchronously with the scraper, achieving complete synchronization between the scraping operation and fineness testing. This completely changes the lag of traditional static testing and can instantly capture the dynamic changes of silver paste caused by solvent evaporation and particle agglomeration during the scraping process, ensuring real-time monitoring of the true fineness of the silver paste.

[0020] Meanwhile, since the silver paste used for testing is taken directly from the real-time paste in the area coated by the doctor blade, rather than from traditional static fixed-point sampling, it can comprehensively reflect the uniformity of the paste throughout the entire coating process, significantly improving the reference value of the test results.

[0021] Finally, dynamic testing and coating operations can be carried out in parallel, eliminating the need for static sampling and manual testing during machine downtime. This effectively avoids production interruptions, improving equipment utilization while reducing silver paste contamination and waste. Furthermore, it can be flexibly selected according to different printing equipment and process requirements, facilitating subsequent maintenance, calibration, and modification, demonstrating wide adaptability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a photovoltaic silver paste scraper with an integrated scraper fineness gauge;

[0023] Figure 2 This is a schematic diagram of working surface A in Embodiment 1;

[0024] Figure 3 This is a schematic diagram of the operating state in Embodiment 1;

[0025] Figure 4 This is a schematic diagram of working surface B in Example 2;

[0026] Figure 5 This is a schematic diagram of the operating state in Embodiment 2;

[0027] In the diagram: 1. Scraper body, 2. Scraper handle, 3. Scraper fineness gauge module, 4. Scale lines. Detailed Implementation

[0028] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0029] Example 1: As Figure 1-3 As shown, a photovoltaic silver paste scraper with an integrated scraper fineness gauge includes a scraper body 1 with a scraping blade, a scraper handle 2 for easy operation at the tail of the scraper body 1, and a scraper fineness gauge module 3 at the end of the scraper body 1. The contact surface between the scraper and the screen template is surface A.

[0030] The fineness gauge module 3 is connected to the scraper body 1 by an interference fit. The fineness gauge module 3 is provided with a wedge-shaped groove with a depth range of 0-50μm and the depth gradually decreases from the starting end to the tail end. The starting end of the wedge-shaped groove is provided with a paste inlet and the tail end is provided with a paste outlet. At the same time, the fineness gauge substrate next to the wedge-shaped groove is also engraved with a scale line 4 for directly reading the fineness value of the silver paste. The setting direction of the wedge-shaped groove is parallel to the forward direction of the scraper.

[0031] How to use:

[0032] S1. Preliminary preparation: Based on the adaptation and maintenance requirements of the printing equipment, select the scraper fineness gauge module 3 and the scraper body 1. After assembly, check that the scraper blade is not deformed, the wedge groove is not blocked, and the scale line 4 is clear to ensure that the equipment is in normal initial condition.

[0033] S2. Installation and debugging: Install the scraper onto the photovoltaic silver paste printing equipment, adjust the angle and pressure to make the blade edge fit the screen template, and confirm that the paste inlet of the scraper fineness gauge module 3 is facing the direction of the scraper's movement.

[0034] S3. Dynamic detection: When the equipment is started, the silver paste automatically flows into the groove as the scraper moves forward, and the range of the area of ​​the scale line 4 where the particles are concentrated is read, which gives the real-time silver paste fineness value.

[0035] S4. After operation: Clean the residual silver paste from the scraper body 1, clean and maintain the device, and store it properly after completion.

[0036] Example 2: Figure 4-5 As shown, the wedge-shaped groove is perpendicular to the direction of the scraper's movement. When inspection is required, the silver paste at the scraper's edge is scraped into the wedge-shaped groove through an auxiliary scraper (not shown in the figure). The contact surface between the scraper and the screen template is surface B; the rest is the same as in Example 1.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A photovoltaic silver paste scraper with an integrated scraper fineness gauge, comprising a scraper body, the scraper body including a scraping blade for scraping silver paste onto a screen template, characterized in that: A scraper fineness gauge module is provided at at least one end of the scraper body; The scraper fineness gauge module includes one or more parallel wedge-shaped grooves, the depth of which gradually decreases from the starting end to the tail end. The starting end is provided with a slurry inlet, and the tail end is provided with a slurry outlet.

2. The photovoltaic silver paste scraper with integrated scraper fineness gauge according to claim 1, characterized in that, The wedge-shaped groove is parallel to the direction of the scraper's movement. As the scraper moves forward, the silver paste flows from the paste inlet into the wedge-shaped groove.

3. The photovoltaic silver paste scraper with integrated scraper fineness gauge according to claim 1, characterized in that, The wedge-shaped groove is perpendicular to the direction of the scraper's advance. When testing is required, the silver paste at the scraper blade edge is scraped into the wedge-shaped groove through an auxiliary scraper.

4. A photovoltaic silver paste scraper with an integrated scraper fineness gauge according to claim 2 or 3, characterized in that, The fineness gauge substrate next to the wedge-shaped groove has scale lines engraved on it for reading fineness values.

5. A photovoltaic silver paste scraper with an integrated scraper fineness gauge according to claim 2 or 3, characterized in that, The scraper fineness gauge module is connected to the scraper body by bolts, snap-fit, or interference fit.

6. A photovoltaic silver paste scraper with an integrated scraper fineness gauge according to claim 2 or 3, characterized in that, The scraper fineness gauge module and the scraper body are an integrated structure.

7. A photovoltaic silver paste scraper with an integrated scraper fineness gauge according to claim 2 or 3, characterized in that, The scraper body is equipped with a scraper handle at its tail.

8. A photovoltaic silver paste scraper with an integrated scraper fineness gauge according to claim 2 or 3, characterized in that, The depth of the wedge-shaped groove ranges from 0 to 50 μm.

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