Scraper device and screen printing equipment

Abstract

The utility model provides a scraper device and silk-screen printing equipment, the scraper device comprises a lifting driving mechanism and a scraper mechanism, the scraper mechanism is mounted at the driving end of the lifting driving mechanism, and the scraper mechanism comprises a first scraper, a second scraper and a third scraper which are sequentially arranged and parallel to one another; a plurality of first scraping teeth are arranged at the bottom of the first scraper at intervals, a first gap is formed between every two adjacent first scraping teeth, the first scraping teeth are used for scraping slurry, and the slurry leaks through the first gaps; a plurality of second scraping teeth are arranged at the bottom of the second scraper at intervals, a second gap is formed between every two adjacent second scraping teeth, and the second scraping teeth are used for scraping the slurry leaking from the first gaps; and the third scraper is used for scraping the slurry leaking from each second gap. The scraper device is optimized, two times of slurry filling are completed through one-time printing, the secondary printing requirement in the silk-screen printing process is reduced, and the printing quality of the silk-screen technology is improved.

Description

Technical Field

[0001] The present application relates to the technical field of scraper devices, and more specifically, to a scraper device and a screen printing device. Background Art

[0002] In screen printing, the substrate is the base material onto which the slurry is applied. Solar cells, for example, are a typical substrate and a key component in the photovoltaic industry, converting solar energy through the photoelectric effect. Screen printing is widely used in the gridding of solar cells due to its precision and efficiency. The main steps in this process include ink return and doctoring, which form the grid lines by controlling the application of the slurry. However, despite the successful application of screen printing technology in solar cell production, some shortcomings remain in actual operation, primarily in terms of print quality.

[0003] After a single screen printing process, the grid lines printed onto the cell surface may be missing or missing, resulting in suboptimal printing results. To compensate for these issues, a second screen printing process is often required. This not only complicates the production process but also wastes time and resources. With the battery industry's ever-increasing demands for production efficiency and quality, this frequent reprinting process is particularly inappropriate, directly impacting overall product quality. Amidst increasingly fierce market competition, improving screen printing quality has become a critical issue for manufacturers. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a scraper device and a screen printing device, which adopt the following technical solutions:

[0005] In a first aspect, the present application provides a scraper device, which includes a lifting drive mechanism and a scraper mechanism. The scraper mechanism is mounted on a driving end of the lifting drive mechanism. The lifting drive mechanism is used to drive the scraper mechanism to move up and down. The scraper mechanism includes a first scraper, a second scraper, and a third scraper that are sequentially arranged and parallel to each other, wherein:

[0006] A plurality of first scraping teeth are arranged at intervals on the bottom of the first scraper, and first gaps are formed between adjacent first scraping teeth. The first scraping teeth are used to scrape the slurry, and the slurry leaks through the first gaps.

[0007] A plurality of second scraping teeth are arranged at intervals at the bottom of the second scraper, and second gaps are formed between adjacent second scraping teeth. Each second scraping tooth is arranged in a one-to-one correspondence with each first gap, and each second gap is arranged in a one-to-one correspondence with each first scraping tooth. Each second scraping tooth is used to scrape the slurry leaking from each first gap.

[0008] The third scraper is used to scrape the slurry leaking from each second gap, and the sum of the scraping areas of the first scraper and the second scraper is not less than the scraping area of ​​the third scraper.

[0009] The scraper device includes three layers of scrapers (first, second and third scrapers), each layer undertakes different scraping tasks; the first scraper scrapes the slurry through its first scraping teeth, the second scraper is responsible for further scraping the slurry that leaks from the first gap of the first scraper, and the third scraper is responsible for scraping the slurry that leaks from the second gap of the second scraper; through this layered design, it can be ensured that the first scraper and the second scraper jointly complete the first scraping and the third scraper independently completes the second scraping, so that the slurry is effectively scraped onto the substrate during the coating process, thereby improving the uniformity and continuity of the coating.

[0010] Optionally, the width of each first scraping tooth is greater than the width of the corresponding second gap, and the width of each second scraping tooth is greater than the width of the corresponding first gap.

[0011] The width of the scraping teeth is greater than the corresponding gap width. This design can ensure effective coverage of the slurry during scraping, improve the accuracy and efficiency of coating, and prevent the leakage holes of the printing screen from not being scraped by the first scraper or the second scraper.

[0012] Optionally, the first scraper, the second scraper and the third scraper are integrally formed;

[0013] The lifting drive mechanism includes a first lifting component. The scraper mechanism is arranged on the driving end of the first lifting component. The first lifting component is configured to drive the scraper mechanism to lift and lower.

[0014] The integrated design of the first, second, and third scrapers not only simplifies the manufacturing process, but also reduces positioning errors caused by assembly and improves the overall stability of the equipment. This design can reduce production costs and improve production efficiency, while also contributing to improved machine reliability.

[0015] Optionally, the first scraper and the second scraper are integrally formed, and the lifting drive mechanism includes a second lifting assembly and a third lifting assembly.

[0016] The integrally formed first scraper and the second scraper are arranged on the driving end of the second lifting assembly, and the second lifting assembly is configured to drive the integrally formed first scraper and the second scraper to move up and down.

[0017] The third scraper is arranged on the driving end of the third lifting assembly, and the third lifting assembly is configured to drive the third scraper to move up and down.

[0018] Optionally, the lifting drive mechanism includes a fourth lifting assembly, a fifth lifting assembly, and a sixth lifting assembly.

[0019] The first scraper is arranged on the driving end of the fourth lifting assembly, and the fourth lifting assembly is configured to drive the first scraper to move up and down.

[0020] The second scraper is arranged on the driving end of the fifth lifting assembly, and the fifth lifting assembly is configured to drive the second scraper to move up and down.

[0021] The third scraper is arranged on the driving end of the sixth lifting assembly, and the sixth lifting assembly is configured to drive the third scraper to move up and down.

[0022] Each scraper is equipped with an independent lifting assembly, so that each scraper can be adjusted individually according to actual needs; this design allows the scraping height of each scraper to be precisely controlled under different process conditions, meeting the flexibility of different materials and printing requirements and maximizing print quality.

[0023] Optionally, the scraper device further includes a transverse driving mechanism, the lifting driving mechanism is arranged on the driving end of the transverse driving mechanism, and the transverse driving mechanism is used to drive the lifting driving mechanism to move along the first horizontal direction or the opposite direction of the first horizontal direction.

[0024] The transverse drive mechanism enables the scraper device to move horizontally, thereby driving the scraper mechanism forward or backward to successfully complete the screen printing process.

[0025] Optionally, the scraper device further includes an ink return knife, which is located in the forward direction of the scraper mechanism and is used to push the slurry to form a slurry layer when the lifting drive mechanism retreats;

[0026] The lifting drive mechanism includes a seventh lifting assembly. The ink return knife is arranged on the driving end of the seventh lifting assembly. The seventh lifting assembly is configured to drive the ink return knife to rise and fall.

[0027] The ink return knife pushes the slurry to form a new slurry layer during the retreat of the lifting drive mechanism, which can at least ensure that the slurry is evenly covered on the screen holes during the coating process, thereby improving the printing effect.

[0028] Optionally, baffles for gathering the slurry are installed at both ends of at least one of the first scraper, the second scraper, and the third scraper.

[0029] Baffles are installed at both ends of the scraper to prevent the slurry from overflowing during the scraping process, thus avoiding slurry waste.

[0030] Optionally, the length directions of the first scraper, the second scraper, and the third scraper form an angle of no more than 90° with the forward direction of the scraper mechanism.

[0031] The angle between the length direction of the first, second and third scrapers and the forward direction is no more than 90 degrees, which optimizes the transfer efficiency of the slurry and ensures that the slurry can pass through the leakage area more easily, thereby improving the quality of the product.

[0032] In a second aspect, the present application further provides a screen printing device, comprising a screen mechanism and the aforementioned scraper device, wherein:

[0033] The screen mechanism is at least used to fix the printing screen, and the printing screen is provided with a leakage area corresponding to the substrate;

[0034] The scraper mechanism in the scraper device smears the slurry on the leak hole area to the corresponding printing material below the leak hole area.

[0035] Optionally, the screen printing device further includes a carrying table for carrying the substrate and a conveying mechanism for transporting the carrying table, wherein:

[0036] The conveying mechanism is a linear conveying mechanism or a rotary conveying mechanism, and is configured to convey the carrying table to the bottom of the screen mechanism;

[0037] The surface of the bearing table is provided with a plurality of adsorption holes for adsorbing the printing substrate, and each adsorption hole is connected to a negative pressure air source.

[0038] The design of the adsorption holes effectively fixes the substrate to prevent displacement during the printing process, while improving the consistency and quality of printing and speeding up production.

[0039] Compared with the existing technology, the beneficial effects of the technical solution of this application are:

[0040] The present application provides a scraper device and a screen printing device. The technical solution of the present application optimizes the scraper device and completes two scraping and filling slurry strokes in one scraper printing stroke, without the need for secondary printing, thereby improving the efficiency and printing quality of the screen printing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 a is a schematic diagram of the first moment of conventional screen printing, Figure 1 b is a schematic diagram of the second moment of conventional screen printing, Figure 1 c is a schematic diagram of the third moment of conventional screen printing;

[0042] Figure 2 Schematic diagram of the three-dimensional structure of the scraper device provided in an embodiment of the present application;

[0043] Figure 3 yes Figure 2 Another perspective schematic diagram of the scraper device shown;

[0044] Figure 4 This is a schematic diagram of the working process of the scraper device provided in an embodiment of the present application;

[0045] Figure 5 yes Figure 2Schematic diagram of the installation of the second scraper and the third scraper;

[0046] Figure 6 yes Figure 5 Another perspective schematic diagram of the scraper device shown;

[0047] Figure 7 yes Figure 2 Schematic diagram of the installation structure of the middle ink return knife;

[0048] Figure 8 1 is a schematic diagram of a three-dimensional structure in which a first scraper, a second scraper, and a third scraper are integrally formed, as provided in an embodiment of the present application;

[0049] Figure 9 yes Figure 8 Schematic diagram from another perspective;

[0050] Figure 10 1 is a schematic diagram of a three-dimensional structure in which a first scraper and a second scraper are integrally formed, as provided in an embodiment of the present application;

[0051] Figure 11 This is a schematic diagram of a three-dimensional structure in which baffles are installed at both ends of a scraper according to an embodiment of the present application;

[0052] Figure 12-13 Schematic diagram of the forward movement of the scraper in the scraper device provided in an embodiment of the present application, wherein the length directions of the first scraper, the second scraper, and the third scraper form an angle of no more than 90° with the forward direction of the scraper mechanism;

[0053] Figures 1 to 13 The following reference numerals are included:

[0054] First scraper 1, second scraper 2, third scraper 3;

[0055] Fourth lifting assembly 4, fifth lifting assembly 5, sixth lifting assembly 6, seventh lifting assembly 7;

[0056] Ink return knife 8, baffle 9. DETAILED DESCRIPTION

[0057] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0058] In existing technologies, there are many grid manufacturing processes for solar cells, with screen printing being the most widely used process in the industry. The screen printing process consists of: ink return and scraping. Ink return: forms a uniform slurry layer on the screen surface; scraping: applies force to the slurry layer to force the slurry through the pores of the screen.

[0059] As the instruction manual Figure 1 As shown, attached Figure 1The screen printing process in the prior art is demonstrated, that is, a scraper is used to move from one end of the screen to the other end. The screen is provided with a leakage hole area corresponding to the substrate, and the scraper applies the slurry on the leakage hole area to the corresponding substrate below the leakage hole area. However, after one screen printing process, the grid lines printed on the surface of the battery cell may be missing or missing, resulting in unsatisfactory printing results. In order to improve the printing quality, a second printing is used for the same battery cell, that is: ink return + scraping + ink return + scraping, or ink return + scraping + (return) scraping again, which takes a long time to print and has low printing efficiency. With the battery industry's increasing requirements for production efficiency and quality, this frequent repeated printing is particularly inappropriate and directly affects the overall product quality. Against the backdrop of increasingly fierce market competition, improving the printing quality of the screen printing process has become a key issue that manufacturers urgently need to solve.

[0060] Therefore, if Figure 2-3 As shown, the present application proposes a scraper device, which includes a lifting drive mechanism and a scraper mechanism. The scraper mechanism is installed on the driving end of the lifting drive mechanism. The lifting drive mechanism is used to drive the scraper mechanism to move up and down. The scraper mechanism includes a first scraper 1, a second scraper 2 and a third scraper 3 that are arranged in sequence and parallel to each other, wherein:

[0061] A plurality of first scraping teeth are arranged at intervals on the bottom of the first scraper 1, and a first gap is formed between adjacent first scraping teeth. The first scraping teeth are used to scrape the slurry, and the slurry leaks through the first gap;

[0062] The bottom of the second scraper 2 is provided with a plurality of second scraping teeth at intervals, and a second gap is formed between adjacent second scraping teeth. Each second scraping tooth is provided in a one-to-one correspondence with each first gap, and each second gap is provided in a one-to-one correspondence with each first scraping tooth. Each second scraping tooth is used to scrape the slurry leaking from each first gap.

[0063] The third scraper 3 is used to scrape the slurry leaking from each second gap. The sum of the scraping areas of the first scraper 1 and the second scraper 2 is not less than the scraping area of ​​the third scraper 3. The overall configuration of the three-layer scraper is designed and adjusted to ensure that the functions of each layer of scrapers cooperate with each other to form an efficient and orderly slurry transfer system.

[0064] The scraper device includes three layers of scrapers (first, second and third scrapers), each layer undertakes different scraping tasks; the first scraper 1 scrapes the slurry through its first scraping teeth, the second scraper 2 is responsible for further scraping the slurry that leaks from the first gap of the first scraper 1, and the third scraper 3 is responsible for scraping the slurry that leaks from the second gap of the second scraper 2; through this layered design, it can ensure that the slurry is effectively scraped onto the substrate during the coating process, thereby improving the uniformity and continuity of the coating.

[0065] Continue to refer Figure 2-3 As shown, the scraper assembly also includes a mounting bracket, on which a lifting drive mechanism is mounted. The lifting drive mechanism includes, but is not limited to, a motor. A slide rail is mounted on the mounting bracket, and the drive end of the motor is connected to the scraper mechanism, with the motor configured to drive the scraper mechanism up and down along the slide rail. The first scraper 1 and the second scraper 2 perform the first scraping operation on the screen, and the third scraper 3 performs the second scraping operation on the screen.

[0066] Optionally, the bottom of the third scraper 3 is a flat bottom structure, which is used to receive the slurry leaking from the second gap after the second scraper 2 is scraped.

[0067] Optionally, the width of each first scraping tooth is greater than the width of the corresponding second gap, and the width of each second scraping tooth is greater than the width of the corresponding first gap; this design ensures that during the scraping process, the slurry can be stably controlled within the combined area of ​​the scraping teeth and the gaps, avoiding leaks on the screen that are not scraped by the first scraper 1 or the second scraper 2.

[0068] The width of the scraping teeth is greater than the corresponding gap width. This design can ensure effective coverage of the slurry during scraping and improve the accuracy and efficiency of coating.

[0069] like Figure 4 As shown, Figure 4 The following is a schematic diagram of the working process of the scraper device of the present application, wherein the downward arrow represents the pressure direction and the horizontal arrow represents the forward direction; the printing process of the scraper device proposed in the present application includes:

[0070] The first scraper 1 first faces the coated slurry layer;

[0071] After the first scraper 1 has scraped, the slurry (and slurry layer) leaking through the first gaps of the first scraper 1 is supplied to the second scraper 2;

[0072] After the second scraper 2 has scraped, the slurry will leak from the second gaps of the first scraper 1 to the third scraper 3;

[0073] The first two scrapers (the first scraper 1 and the second scraper 2) complete the first scraping print, and the third scraper 3 completes the second scraping print.

[0074] Optionally, the third scraper 3 is connected to the driving end of the lifting drive mechanism through a first connecting member.

[0075] like Figure 5-7 As shown, the second scraper 2 and the third scraper 3 are connected to the driving end of the lifting drive mechanism through the second connecting member and the third connecting member respectively.

[0076] Among them, the lifting drive mechanism can adopt a combination of a common servo motor and a linear module; further, the lifting drive mechanism also includes an elastic mechanism, which is installed at the driving end of the linear module, and the first scraper 1, the second scraper 2, and the third scraper 3 can be arranged at the elastic end of the elastic mechanism.

[0077] Optional, such as Figure 8-9 As shown, the first scraper 1, the second scraper 2 and the third scraper 3 are integrally formed, that is, the scraper mechanism is an integrated structure;

[0078] The lifting drive mechanism includes a first lifting component. The scraper mechanism is arranged on the driving end of the first lifting component. The first lifting component is configured to drive the scraper mechanism to lift and lower.

[0079] The integrated design of the first, second, and third scrapers 3 not only simplifies the manufacturing process, but also reduces positioning errors caused by assembly, improving the overall stability of the device. This design can reduce production costs and improve production efficiency, while also helping to improve the reliability of the machine.

[0080] Optional, such as Figure 10 As shown, the first scraper 1 and the second scraper 2 are integrally formed, and the lifting drive mechanism includes a second lifting component and a third lifting component.

[0081] The integrally formed first scraper 1 and the second scraper 2 are arranged on the driving end of the second lifting assembly, and the second lifting assembly is configured to drive the integrally formed first scraper 1 and the second scraper 2 to move up and down.

[0082] The third scraper 3 is arranged on the driving end of the third lifting assembly, and the third lifting assembly is configured to drive the third scraper 3 to move up and down.

[0083] Optional, continue to refer to Figure 2-3 As shown, the scraper mechanism is a split structure, and the lifting drive mechanism includes a fourth lifting component 4, a fifth lifting component 5 and a sixth lifting component 6.

[0084] The first scraper 1 is arranged on the driving end of the fourth lifting assembly 4, and the fourth lifting assembly 4 is configured to drive the first scraper 1 to move up and down.

[0085] The second scraper 2 is arranged on the driving end of the fifth lifting assembly 5, and the fifth lifting assembly 5 is configured to drive the second scraper 2 to move up and down.

[0086] The third scraper 3 is arranged on the driving end of the sixth lifting assembly 6 , and the sixth lifting assembly 6 is configured to drive the third scraper 3 to move up and down.

[0087] Each scraper is equipped with an independent lifting assembly, so that each scraper can be individually adjusted according to actual needs; this design allows the scraping height of each scraper to be precisely controlled under different process conditions, meeting the flexibility of different materials and printing requirements.

[0088] Optionally, the scraper device further includes a transverse driving mechanism, the lifting driving mechanism is arranged on the driving end of the transverse driving mechanism, and the transverse driving mechanism is used to drive the lifting driving mechanism to move along the first horizontal direction or the opposite direction of the first horizontal direction.

[0089] The transverse drive mechanism enables the scraper device to move horizontally, thereby driving the scraper mechanism forward or backward to successfully complete the scraping action.

[0090] Optional, such as Figure 7 The scraper device also includes an ink return knife 8, which is located in the forward direction of the scraper mechanism. The ink return knife 8 is used to push the slurry to form a uniform slurry layer when the lifting drive mechanism retreats;

[0091] The lifting drive mechanism includes a seventh lifting assembly 7 , and the ink return knife 8 is provided on the driving end of the seventh lifting assembly 7 . The seventh lifting assembly 7 is configured to drive the ink return knife 8 to move up and down.

[0092] Preferably, the scraper device also includes a mounting bracket, and the seventh lifting component 7 is installed on the mounting bracket; the seventh lifting component 7 includes but is not limited to a motor, and a sliding track is installed on the mounting bracket. The driving end of the motor is connected to the ink return knife 8, and the motor is configured to drive the ink return knife 8 to rise and fall along the sliding track.

[0093] Preferably, the ink return knife 8 is connected to the driving end of the seventh lifting assembly 7 through a fourth connecting member.

[0094] The ink return blade 8 is used to evenly spread the slurry on the printing screen after the scraper mechanism has moved the slurry. The ink return blade 8 pushes the slurry to form a new slurry layer during the retraction of the lifting drive mechanism, ensuring the uniformity and continuity of the slurry during the coating process.

[0095] Optional, such as Figure 11 As shown, baffles 9 for gathering the slurry are installed at both ends of at least one of the first scraper 1 , the second scraper 2 , and the third scraper 3 .

[0096] Baffles 9 are installed at both ends of the scraper to prevent the slurry from overflowing during the scraping process, thereby improving the printing quality.

[0097] Optional, such as Figure 12-13As shown, the length directions of the first scraper 1, the second scraper 2, and the third scraper 3 form an angle of no more than 90° with the forward direction of the scraper mechanism, that is, an acute angle or a right angle. The angle design of the scraper with respect to the forward direction is intended to optimize the flow path and scraping effect of the slurry. When the scraper angle is appropriate, the slurry can be guided and transferred more smoothly by the scraper, reducing the retention and uneven distribution of the slurry during the scraping process, and saving slurry.

[0098] in, Figure 12 The figure shows the case where the angles between the length directions of the first scraper 1, the second scraper 2, and the third scraper 3 and the forward direction of the scraper mechanism are right angles;

[0099] Figure 13 The figure shows a situation where the angles between the length directions of the first scraper 1 , the second scraper 2 , and the third scraper 3 and the forward direction of the scraper mechanism are acute angles.

[0100] The included angle between the length direction of the first, second and third scrapers 3 and the forward direction is no more than 90 degrees, which optimizes the transfer efficiency of the slurry, ensures accurate coating of the leak area, and improves the quality of the product.

[0101] In a second aspect, the present application further provides a screen printing device, comprising a screen mechanism and the aforementioned scraper device, wherein:

[0102] The screen mechanism is at least used to fix the printing screen, and the printing screen is provided with a leakage area corresponding to the substrate;

[0103] The scraper mechanism in the scraper device smears the slurry on the leak hole area to the corresponding printing material below the leak hole area.

[0104] Optionally, the screen printing device further includes a carrying table for carrying the substrate and a conveying mechanism for transporting the carrying table, wherein:

[0105] The conveying mechanism is a linear conveying mechanism or a rotary conveying mechanism, and is configured to convey the carrying table to the bottom of the screen mechanism;

[0106] The surface of the supporting table is provided with a number of adsorption holes for adsorbing the substrate, and each adsorption hole is connected to a negative pressure air source; the design of the adsorption holes effectively fixes the substrate to avoid displacement during the printing process, while improving the consistency and quality of printing and speeding up production.

[0107] Preferably, a slurry cleaning and supply mechanism is provided on one side of the printing screen for cleaning the slurry on the printing screen, the scraper mechanism and the ink return knife 8 to avoid the slurry from solidifying on the printing screen and reduce the risk of perforation.

[0108] Preferably, when the screen printing equipment is used for the grid making process of the battery cell, the screen printing equipment also includes a conductive material supply mechanism, and a hollow area corresponding to a predetermined area of ​​at least one battery cell is opened on the printing screen, and the transverse driving mechanism in the scraper device drives the scraper mechanism to move from the first end of the printing screen to the second end, so as to apply the conductive material supplied by the conductive material supply mechanism to the entire area of ​​the printing screen, and the conductive material in the hollow area is applied to the predetermined area of ​​the battery cell corresponding to the hollow area below the hollow area, and the predetermined area is the area where the main grid line of the battery cell is located.

[0109] In the screen printing device of the present application, during actual printing, the mounting bracket is first moved to the other side of the printing screen, and then the scraper mechanism is pressed against the printing screen, and the ink return knife 8 is lifted upward;

[0110] Next, the mounting bracket is moved horizontally to one side of the printing screen, so that the scraper mechanism pushes on the printing screen with a certain pressure until the scraper mechanism moves to one side of the printing screen, so that the slurry pre-spread on the printing screen is squeezed onto the substrate below the printing screen;

[0111] Next, lift the scraper mechanism and add enough slurry to the printing screen, lower the ink return knife 8, and move the mounting bracket back horizontally to the other side of the printing screen. The added slurry is then spread onto the printing screen by the ink return knife 8.

[0112] The present application has been described above in sufficient detail with certain specificity. Those skilled in the art will understand that the descriptions in the examples are merely illustrative, and that all modifications made without departing from the true spirit and scope of the present application are intended to be within the scope of protection of the present application. The scope of protection claimed in the present application is defined by the claims, not by the description in the examples.

Claims

1. A scraper device, characterized in that: The scraper device includes a lifting drive mechanism and a scraper mechanism, wherein the scraper mechanism is mounted on the driving end of the lifting drive mechanism, and the lifting drive mechanism is used to drive the scraper mechanism to move up and down, and the scraper mechanism includes a first scraper, a second scraper, and a third scraper that are sequentially arranged and parallel to each other, wherein: A plurality of first scraping teeth are arranged at intervals on the bottom of the first scraper, and first gaps are formed between adjacent first scraping teeth. The first scraping teeth are used to scrape the slurry, and the slurry leaks through the first gaps. A plurality of second scraping teeth are arranged at intervals at the bottom of the second scraper, and second gaps are formed between adjacent second scraping teeth. Each second scraping tooth is arranged in a one-to-one correspondence with each first gap, and each second gap is arranged in a one-to-one correspondence with each first scraping tooth. Each second scraping tooth is used to scrape the slurry leaking from each first gap. The third scraper is used to scrape the slurry leaking from each of the second gaps, and the sum of the scraping areas of the first scraper and the second scraper is not less than the scraping area of ​​the third scraper.

2. The scraper device according to claim 1, characterized in that The width of each first scraping tooth is greater than the width of the corresponding second gap, and the width of each second scraping tooth is greater than the width of the corresponding first gap.

3. The scraper device according to claim 1, characterized in that The first scraper, the second scraper and the third scraper are integrally formed; The lifting drive mechanism includes a first lifting component. The scraper mechanism is arranged on a driving end of the first lifting component. The first lifting component is configured to drive the scraper mechanism to move up and down.

4. The scraper device according to claim 1, characterized in that The first scraper and the second scraper are integrally formed, and the lifting drive mechanism includes a second lifting component and a third lifting component. The first scraper and the second scraper formed in one piece are arranged on the driving end of the second lifting assembly, and the second lifting assembly is configured to drive the first scraper and the second scraper formed in one piece to move up and down. The third scraper is arranged on the driving end of the third lifting assembly, and the third lifting assembly is configured to drive the third scraper to move up and down.

5. The scraper device according to claim 1, characterized in that The lifting drive mechanism includes a fourth lifting assembly, a fifth lifting assembly and a sixth lifting assembly. The first scraper is arranged on the driving end of the fourth lifting assembly, and the fourth lifting assembly is configured to drive the first scraper to move up and down. The second scraper is arranged on the driving end of the fifth lifting assembly, and the fifth lifting assembly is configured to drive the second scraper to move up and down. The third scraper is arranged on the driving end of the sixth lifting assembly, and the sixth lifting assembly is configured to drive the third scraper to move up and down.

6. The scraper device according to claim 1, characterized in that The scraper device further includes a transverse driving mechanism, the lifting driving mechanism is arranged on the driving end of the transverse driving mechanism, and the transverse driving mechanism is used to drive the lifting driving mechanism to move along a first horizontal direction or in the opposite direction of the first horizontal direction.

7. The scraper device according to claim 6, characterized in that The scraper device further includes an ink return knife, which is used to push the slurry to form a slurry layer when the lifting drive mechanism retracts; The lifting drive mechanism includes a seventh lifting component. The ink return knife is arranged on the driving end of the seventh lifting component. The seventh lifting component is configured to drive the ink return knife to move up and down.

8. The scraper device according to claim 1, characterized in that Baffles are installed at both ends of at least one of the first scraper, the second scraper, and the third scraper.

9. The scraper device according to claim 1, characterized in that The length directions of the first scraper, the second scraper, and the third scraper form an angle of no more than 90° with the forward direction of the scraper mechanism.

10. A screen printing device, characterized in that: The screen printing device comprises a screen mechanism and a scraper device according to any one of claims 1 to 9, wherein: The screen mechanism is at least used to fix the printing screen, and the printing screen is provided with a leakage area corresponding to the substrate; The scraper mechanism in the scraper device smears the slurry on the leakage hole area onto the corresponding printing material below the leakage hole area.

11. The screen printing device according to claim 10, characterized in that: The screen printing device further includes a carrying table for carrying a substrate and a conveying mechanism for transporting the carrying table, wherein: The conveying mechanism is a linear conveying mechanism or a rotary conveying mechanism, and is configured to convey the carrying table to the bottom of the screen mechanism; The surface of the carrying table is provided with a plurality of adsorption holes for adsorbing the printing substrate, and each of the adsorption holes is connected to a negative pressure air source.

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