Solar cell printing machine and solar cell printing equipment
By designing a controllable movable ink-return knife assembly in a solar cell printing device, the problem of slurry being extruded to both sides is solved, which improves slurry utilization and reduces production costs.
Patent Information
- Application Number
- CN202420477956.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-03-12
Smart Images
Figure CN222431838U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solar cells, in particular to a solar cell printer and solar cell printing equipment. Background Art
[0002] A solar cell is a device that utilizes solar energy and directly converts light energy into electrical energy through the photoelectric effect or the photochemical effect. The above-mentioned solar cell generally includes a semiconductor substrate and a metal grid line.
[0003] In the prior art, metal grid lines or other structures are usually made by screen printing. In actual use, the screen for printing is usually laid flat on the surface of the structure to be printed. Then, slurry (such as silver paste or aluminum paste) is added to the surface of the screen. After that, the slurry is scraped with a scraper in the printing equipment. At this time, the slurry is pressed into the leakage holes of the screen at a certain speed and angle. After printing is completed, the ink is returned using the ink return knife in the printing equipment.
[0004] However, since the distance between the scraper and the ink return blade is fixed, the height of the slurry accumulated between the scraper and the ink return blade is too high after the ink return blade returns the ink. At this time, when the scraper scrapes the slurry again for printing, part of the slurry is squeezed to the left and right sides of the scraper, resulting in dry slurry that cannot be fully and effectively utilized. Based on this, a large amount of slurry is wasted, increasing the production cost of the metal grid line. Utility Model Content
[0005] The utility model aims to provide a solar cell printer and solar cell printing equipment, which are used to reduce the slurry content squeezed by a scraper to the left and right sides of the scraper, improve the utilization rate of the slurry, and reduce the production cost of metal grid lines.
[0006] In order to achieve the above-mentioned purpose, in a first aspect, the utility model provides a solar cell printer. The solar cell printer comprises: a printing head, a scraper assembly and an ink return knife assembly. The scraper assembly can be lifted and lowered on the printing head, the ink return knife assembly can be lifted and lowered on the printing head, and the ink return knife assembly is located on one side of the scraper assembly. The ink return knife assembly can be controlled to move toward or away from the scraper assembly to flatten at least part of the slurry between the scraper assembly and the ink return knife assembly.
[0007] Compared with the prior art, in the solar cell printer provided by the utility model, the ink return knife assembly can be controlled to move toward or away from the scraper assembly (that is, the distance between the ink return knife assembly and the scraper assembly can be adjusted) to level at least part of the slurry between the scraper assembly and the ink return knife assembly. Specifically, in actual use, when the solar cell printer is in an ink return state, and the ink return knife assembly is located very close to the scraper assembly (that is, the ink return knife assembly and the scraper assembly are in the initial state), the printing head drives the scraper assembly and the ink return knife assembly to move from the knife collection position to the lower knife position, and after the scraper assembly and the ink return knife assembly are simultaneously located in the preset position (at this time, the distance between the scraper assembly and the ink return knife assembly is ignored), the printing head drives the scraper assembly to reach the lower knife position first, and the ink return knife assembly is always located in the preset position during this process. Then, when the scraper assembly reaches the lower knife position, the ink return knife assembly moves in a direction close to the scraper assembly, and the ink return knife assembly returns ink, and at the same time the scraper assembly descends and abuts against the screen to block the slurry recovered by the ink return knife assembly.
[0008] Compared to the previous situation or the prior art where the ink return knife assembly is located very close to the scraper assembly, the distance between the ink return knife assembly and the scraper assembly in the utility model gradually decreases until it returns to the initial state. At this time, in the process of the ink return knife assembly gradually approaching the scraper assembly, part or most of the slurry recovered by the ink return knife assembly is gradually smoothed, so that the thickness of the slurry between the scraper assembly and the ink return knife assembly is reduced compared to the prior art. When the thickness of the slurry between the scraper assembly and the ink return knife assembly is reduced, the scraper assembly can use as much or fully utilize this part of the slurry as possible when scraping the slurry again for printing, thereby reducing or clearing the slurry content squeezed to the left and right sides of the scraper by the scraper assembly, improving the utilization rate of the slurry, and reducing the production cost of the metal grid line. It should be understood that the above-mentioned preset position can be set according to the maximum distance between the scraper assembly and the ink return knife assembly, and is not specifically limited here.
[0009] In one implementation, the solar cell printer further comprises: a lifting member, which is disposed on the printing head and is used to respectively drive the scraper assembly and the ink return blade assembly to rise or fall.
[0010] When the above technical solution is adopted, when the solar cell printer is in the printing state, the lifting member drives the ink return knife assembly to rise and puts the ink return knife assembly in the waiting position; the lifting member drives the scraper assembly to descend and puts the scraper assembly in the printing position. Similarly, when the solar cell printer is in the ink return state, the lifting member drives the ink return knife assembly to descend and puts the ink return knife assembly in the ink return position; the lifting member drives the scraper assembly to rise and puts the scraper assembly in the waiting position. It should be understood that the above printing position, ink return position, and waiting position can be set according to actual conditions, and no specific limitation is made here.
[0011] In one implementation, the printing head is provided with a groove, the length direction of the groove is consistent with the direction from the scraper assembly to the ink return knife assembly. One end of the ink return knife assembly is movably disposed in the groove, and the ink return knife assembly can be controlled to approach or move away from the scraper assembly along the length direction of the groove.
[0012] When the above technical solution is adopted, the solar cell printer does not introduce any new components, and the movement of the ink return knife assembly is achieved by providing a groove on the printing head. This method is simple, convenient and easy to implement.
[0013] In one implementation, the solar cell printer further comprises: a first driving member. The first driving member is connected to the ink return blade assembly and is used to drive the ink return blade assembly to approach or move away from the scraper assembly along the length direction of the groove. In this case, not only can the moving speed of the ink return blade assembly be increased, but also manual intervention can be reduced, saving time and effort.
[0014] In one implementation, the solar cell printer further comprises: a bidirectional screw and a second driving member. The bidirectional screw is arranged on the lifting member, and the lifting member is used to drive the bidirectional screw to rise or fall. The length direction of the bidirectional screw is consistent with the direction from the scraper assembly to the ink return knife assembly, and one end of the ink return knife assembly is arranged on the bidirectional screw. The second driving member is connected to one end of the bidirectional screw and is used to drive the bidirectional screw to move.
[0015] In one implementation, the solar cell printer further comprises: a guide rail and a third driving member. The guide rail is arranged on the lifting member, and the lifting member is used to drive the guide rail to rise or fall. The guiding direction of the guide rail is consistent with the direction from the scraper assembly to the ink return knife assembly, and one end of the ink return knife assembly is slidably connected to the guide rail. The third driving member is connected to the ink return knife assembly, and is used to drive the ink return knife assembly to move along the guiding direction of the guide rail.
[0016] In summary, there are various ways to achieve the controllable movement of the ink return blade assembly toward or away from the scraper assembly, which can be selected according to actual conditions. In this way, the solar cell printer can be applied to different application scenarios, thereby expanding its scope of application.
[0017] In one implementation, the distance between the scraper assembly and the ink return blade assembly is greater than or equal to 3 centimeters and less than or equal to 8 centimeters.
[0018] In the case of adopting the above technical solution, since the distance between the scraper assembly and the ink return knife assembly is greater than or equal to 3 cm, it can be known that the minimum distance between the scraper assembly and the ink return knife assembly is 3 cm, that is, the scraper assembly and the ink return knife assembly are spaced apart, and the scraper assembly and the ink return knife assembly can be prevented from influencing each other during actual use. Furthermore, since the distance between the scraper assembly and the ink return knife assembly is less than or equal to 8 cm, the ink return time of the ink return knife assembly can be shortened while ensuring that the thickness of the slurry between the scraper assembly and the ink return knife assembly is small, thereby improving work efficiency.
[0019] In one implementation, the scraper assembly is parallel to the ink return blade assembly, and the scraper assembly and the ink return blade assembly are spaced apart. The length direction of the scraper assembly is perpendicular to the printing direction of the scraper assembly, the length direction of the ink return blade assembly is perpendicular to the ink return direction of the ink return blade assembly, and the printing direction is opposite to the ink return direction.
[0020] In one implementation, along the printing direction, the ink return blade assembly is located in front of the scraper assembly.
[0021] In a second aspect, the utility model further provides a solar cell printing device, which comprises a controller and the solar cell printing machine described in the above technical solution.
[0022] Compared with the prior art, since the solar cell printing device provided by the utility model includes the solar cell printer described in the above technical solution, in the solar cell printer, the ink return knife assembly can be controlled to move toward or away from the scraper assembly (that is, the distance between the ink return knife assembly and the scraper assembly can be adjusted) to level at least part of the slurry between the scraper assembly and the ink return knife assembly. Specifically, in actual use, when the solar cell printer is in an ink return state, and the ink return knife assembly is located very close to the scraper assembly (that is, the ink return knife assembly and the scraper assembly are in the initial state), the printing head drives the scraper assembly and the ink return knife assembly to move from the knife collection position to the lower knife position, and after the scraper assembly and the ink return knife assembly are simultaneously located in the preset position (the distance between the scraper assembly and the ink return knife assembly is ignored at this time), the printing head drives the scraper assembly to reach the lower knife position first, and during this process, the ink return knife assembly is always located in the preset position. Then, when the scraper assembly reaches the lower blade position, the ink return knife assembly moves toward the scraper assembly, and the ink return knife assembly returns ink. At the same time, the scraper assembly descends and abuts against the screen to block the slurry recovered by the ink return knife assembly.
[0023] Compared to the previous situation or the prior art where the ink return knife assembly is located very close to the scraper assembly, the distance between the ink return knife assembly and the scraper assembly in the utility model gradually decreases until it returns to the initial state. At this time, in the process of the ink return knife assembly gradually approaching the scraper assembly, part or most of the slurry recovered by the ink return knife assembly is gradually smoothed, so that the thickness of the slurry between the scraper assembly and the ink return knife assembly is reduced compared to the prior art. When the thickness of the slurry between the scraper assembly and the ink return knife assembly is reduced, the scraper assembly can use as much or fully utilize this part of the slurry as possible when scraping the slurry again for printing, thereby reducing or clearing the slurry content squeezed to the left and right sides of the scraper by the scraper assembly, improving the utilization rate of the slurry, and reducing the production cost of the metal grid line. It should be understood that the above-mentioned preset position can be set according to the maximum distance between the scraper assembly and the ink return knife assembly, and is not specifically limited here. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0025] Figure 1 This is a schematic diagram of the structure of a solar cell printer in an embodiment of the utility model;
[0026] Figure 2 In the embodiment of the utility model Figure 1 Bottom view of
[0027] Figure 3 This is a schematic diagram of the positional relationship among the scraper assembly, the ink return knife assembly, the slurry and the screen in the embodiment of the utility model;
[0028] Figure 4 This is a schematic diagram of the structure of the printing head in the embodiment of the utility model;
[0029] Figure 5 It is a structural schematic diagram of a scraper assembly and an ink return knife assembly in an embodiment of the utility model;
[0030] Figure 6 This is a schematic diagram of the positional relationship between the scraper assembly, the ink return knife assembly and the slurry in the embodiment of the utility model;
[0031] Figure 7 The positional relationship between the scraper assembly and the ink return knife assembly in the embodiment of the utility model is shown in FIG. Figure 1 ;
[0032] Figure 8 The positional relationship between the scraper assembly and the ink return knife assembly in the embodiment of the utility model is shown in FIG. Figure 2 .
[0033] Reference numerals:
[0034] 1-printing head, 10-groove, 2-scraper assembly, 3-ink return knife assembly, 4-guide rail, 5-slurry, 6-screen, 7-lifting part. DETAILED DESCRIPTION
[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.
[0038] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0039] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0040] In combination with the background technology, the slurry squeezed to the left and right sides of the scraper by the scraper will dry and form dry slurry if it is not used for a long time, such as silver powder particles or aluminum powder particles. In the prior art, the dry slurry ratio is generally around 10%-15%. As the metal grid line continues to be refined, the dry slurry ratio will continue to increase.
[0041] In the actual printing process, the scraper will inevitably carry a small amount of silver powder particles or aluminum powder particles into the printing slurry. At this time, the silver powder particles or aluminum powder particles will block the leakage holes of the screen, causing the metal gate lines printed on the silicon wafer to be broken, thereby affecting the yield of the metal gate lines.
[0042] Furthermore, since the slurry becomes dry slurry, that is, it changes from colloid to solid. At this time, in the actual printing process, the silver powder particles or aluminum powder particles are subjected to external forces such as from the scraper, which will squeeze the screen. Furthermore, since the height of the slurry accumulated between the scraper and the ink return blade is too high, and the scraper squeezes the slurry on the left and right sides of the scraper to form dry slurry, the scraper is subjected to excessive external force under the dual effects of the dry slurry and the high slurry, causing the scraper to jump.
[0043] In order to solve the above technical problems, in the first aspect, the present utility model provides a solar cell printing machine. Figure 1 The solar cell printer may include: a printing head 1, a scraper assembly 2 and an ink return blade assembly 3. The scraper assembly 2 is movably disposed on the printing head 1, and the ink return blade assembly 3 is movably disposed on the printing head 1, and the ink return blade assembly 3 is located on one side of the scraper assembly 2. The ink return blade assembly 3 can be controlled to move toward or away from the scraper assembly 2 to smooth at least part of the slurry between the scraper assembly 2 and the ink return blade assembly 3.
[0044] The scraper assembly may include a scraper and a connecting shaft. Specifically, the scraper is arranged on the printing head via the connecting shaft. Further, the ink return knife assembly may include an ink return knife and a connecting shaft. Specifically, the ink return knife is arranged on the printing head via the connecting shaft. It should be understood that the specific structures of the printing head, scraper assembly and ink return knife assembly can be referred to the prior art and will not be described in detail here.
[0045] Compared with the prior art, see Figures 1 to 3In the solar cell printer provided by the embodiment of the utility model, the ink return knife assembly 3 can be controlled to move toward or away from the scraper assembly 2 (that is, the distance between the ink return knife assembly 3 and the scraper assembly 2 can be adjusted) to smooth at least part of the slurry between the scraper assembly 2 and the ink return knife assembly 3. Specifically, in actual use, when the solar cell printer is in the ink return state, and the ink return knife assembly 3 is located very close to the scraper assembly 2 (that is, the ink return knife assembly 3 and the scraper assembly 2 are in the initial state), the printing head 1 drives the scraper assembly 2 and the ink return knife assembly 3 to move from the knife collection position b to the lower knife position a. After the scraper assembly 2 and the ink return knife assembly 3 are simultaneously located in the preset position (the distance between the scraper assembly 2 and the ink return knife assembly 3 is ignored at this time), the printing head 1 drives the scraper assembly 2 to reach the lower knife position a first. During this process, the ink return knife assembly 3 is always located in the preset position. Next, when the scraper assembly 2 reaches the lower blade position a, the ink return knife assembly 3 moves toward the scraper assembly 2 and returns ink. At the same time, the scraper assembly 2 descends and abuts against the screen 6 to block the slurry 5 recovered by the ink return knife assembly 3.
[0046] Compared with the previous or prior art situation where the ink return blade assembly 3 is located very close to the scraper assembly 2, in the embodiment of the utility model, the distance between the ink return blade assembly 3 and the scraper assembly 2 is gradually reduced until it returns to the initial state. At this time, in the process of the ink return blade assembly 3 gradually approaching the scraper assembly 2, part or most of the slurry 5 recovered by the ink return blade assembly 3 is gradually smoothed, so that the thickness of the slurry 5 between the scraper assembly 2 and the ink return blade assembly 3 is reduced compared with the prior art. When the thickness of the slurry 5 between the scraper assembly 2 and the ink return blade assembly 3 is reduced, the scraper assembly 2 can use as much or fully use the slurry 5 as possible when scraping the slurry 5 again for printing, thereby reducing or clearing the content of the slurry 5 squeezed to the left and right sides of the scraper and behind the scraper assembly 2 by the scraper assembly 2, improving the utilization rate of the slurry 5, and reducing the production cost of the metal grid line. Furthermore, the content of dry slurry formed in the later stage can be reduced, that is, the content of silver powder particles or aluminum powder particles can be reduced, thereby reducing or clearing the content of silver powder particles or aluminum powder particles carried into the printing slurry 5 by the scraper, so as to reduce or eliminate the probability that the silver powder particles or aluminum powder particles will block the leakage holes of the screen, thereby reducing or eliminating the situation where the metal grid lines printed on the silicon wafer are broken, and improving the yield of the metal grid lines. Further, the probability of the screen being broken by silver powder particles or aluminum powder particles, and the probability of the scraper jumping can be reduced or eliminated. In addition, since the content of dry slurry is reduced, the addition of diluent and the use of filter screens for filtering can be reduced or avoided at this time. Based on this, shutdowns can be reduced or avoided, thereby improving printing efficiency.
[0047] It should be understood that the above-mentioned preset position can be set according to the maximum distance between the scraper assembly and the ink return knife assembly, and no specific limitation is made here.
[0048] As a possible implementation, see Figure 1 and Figure 3 The scraper assembly 2 is parallel to the ink return knife assembly 3, and the scraper assembly 2 and the ink return knife assembly 3 are spaced apart.
[0049] As a possible implementation method, the length direction L1 of the scraper assembly 2 is perpendicular to the printing direction A of the scraper assembly 2, the length direction L2 of the ink return knife assembly 3 is perpendicular to the ink return direction B of the ink return knife assembly 3, and the printing direction A and the ink return direction B are opposite and parallel to each other.
[0050] The working mode of the solar cell printer in the prior art is to return ink first and then print. Figure 3 , along the printing direction A, the ink return blade assembly 3 is located in front of the scraper assembly 2. At this time, the content of the slurry 5 squeezed by the scraper assembly 2 to the left and right sides of the scraper and behind the scraper assembly 2 can be reduced or cleared without changing the working mode of the prior art.
[0051] As a possible implementation, the solar cell printer may include one or two scraper assemblies. In this case, the solar cell printer provided by the embodiment of the utility model may be applicable to a single scraper assembly or a double scraper assembly, thereby expanding the scope of application of the solar cell printer.
[0052] As a possible implementation, the solar cell printer may further include a lifting member, which is disposed on the printing head and is used to respectively drive the scraper assembly and the ink return blade assembly to rise or fall.
[0053] When the solar cell printer is in the printing state, the lifting member drives the ink return knife assembly to rise and puts the ink return knife assembly in the waiting position; the lifting member drives the scraper assembly to descend and puts the scraper assembly in the printing position. Similarly, when the solar cell printer is in the ink return state, the lifting member drives the ink return knife assembly to descend and puts the ink return knife assembly in the ink return position; the lifting member drives the scraper assembly to rise and puts the scraper assembly in the waiting position. It should be understood that the above-mentioned printing position, ink return position, and waiting position can be set according to actual conditions, and no specific limitation is made here.
[0054] Exemplarily, the lifting member can be a lifting cylinder, or an upper and lower electrode, etc. In the embodiment of the utility model, the scraper assembly is connected to the printing head through an upper and lower electrode, and the ink return blade assembly is connected to the printing head through another upper and lower electrode. As for the specific structure of the upper and lower electrodes, please refer to the prior art and will not be described in detail here.
[0055] The following describes "the ink return blade assembly can be controlled to move toward or away from the scraper assembly" by taking three possible implementation methods as examples. It should be understood that the following description is only for understanding and is not used for specific limitation.
[0056] Example 1: See Figure 1 and Figure 2 , a groove 10 is provided on the above-mentioned printing head 1, and the length direction L3 of the groove 10 is consistent with the direction C from the scraper assembly 2 to the ink return knife assembly 3. One end of the ink return knife assembly 3 is movably arranged in the groove 10, and the ink return knife assembly 3 can be controlled to approach or move away from the scraper assembly 2 along the length direction of the groove 10. Exemplarily, a groove 10 is provided on a surface of the printing head 1 facing the ink return knife assembly 3. As for the position of the lifting member, it can be selected according to actual conditions, as long as it is ensured that the lifting member can lift the ink return knife assembly 3 normally, and the ink return knife assembly 3 can approach or move away from the scraper assembly 2 along the length direction of the groove 10.
[0057] When the above technical solution is adopted, the solar cell printer does not introduce any new components, and the movement of the ink return blade assembly 3 is achieved by providing a groove 10 on the printing head 1. This method is simple, convenient and easy to implement.
[0058] The power source for the ink return knife assembly 3 to move closer to or away from the scraper assembly 2 along the length direction of the groove 10 can be manually operated, or it can be driven by a first driving member. In an optional manner, the solar cell printer further includes: a first driving member. The first driving member is connected to the ink return knife assembly 3, and is used to drive the ink return knife assembly 3 to move closer to or away from the scraper assembly 2 along the length direction of the groove 10. At this time, not only the moving speed of the ink return knife assembly 3 can be increased, but also the manual participation can be reduced, saving time and effort. Exemplarily, the first driving member can be a driving motor, a driving cylinder, etc. As for the location of the first driving member, it can be selected according to actual conditions, such as one side of the printing head, or one side of the ink return knife assembly, or on the printing head.
[0059] Example 2: The solar cell printer further includes: a bidirectional screw and a second drive. The bidirectional screw is arranged on the lifting member, and the lifting member is used to drive the bidirectional screw to rise or fall. The length direction of the bidirectional screw is consistent with the direction from the scraper assembly to the ink return knife assembly, and one end of the ink return knife assembly is arranged on the bidirectional screw. The second drive is connected to one end of the bidirectional screw and is used to drive the bidirectional screw to move.
[0060] Exemplarily, when the lifting member is a lifting cylinder, the solar cell printer includes two lifting cylinders that cooperate with the ink return knife assembly, and the two lifting cylinders are opposite and spaced apart on a side of the printing head facing the ink return knife assembly. The two ends of the bidirectional lead screw are respectively connected to the driving ends of the lifting cylinders. At this time, the middle area of the bidirectional lead screw is spaced apart from the printing head, and the ink return knife assembly moves in the middle area of the bidirectional lead screw. Furthermore, the second driving member can be a nut, a handle, or a combination of a motor and a worm gear screw, etc. When the second driving member is a nut or a handle, it can be manually operated by a staff member. When the second driving member is a combination of a motor and a worm gear screw, the start or disconnection of the motor can be controlled to control whether the bidirectional lead screw moves and the movement direction of the ink return knife assembly.
[0061] Example 3: See Figure 4 The solar cell printer further comprises: a guide rail 4 and a third driving member. The guide rail 4 is arranged on a lifting member 7, and the lifting member 7 is used to drive the guide rail 4 to rise or fall. The guiding direction of the guide rail 4 is consistent with the direction from the scraper assembly 2 to the ink return knife assembly 3, and one end of the ink return knife assembly 3 is slidably connected to the guide rail 4. The third driving member is connected to the ink return knife assembly 3, and is used to drive the ink return knife assembly 3 to move along the guiding direction of the guide rail 4.
[0062] Exemplarily, when the lifting member is a lifting cylinder, the solar cell printer includes two lifting cylinders cooperating with the ink return knife assembly 3, and the two lifting cylinders are arranged oppositely and spaced apart on a side of the printing head 1 facing the ink return knife assembly 3. The two ends of the guide rail 4 are respectively connected to the driving ends of the lifting cylinders, and at this time, the middle area of the guide rail 4 is spaced apart from the printing head 1, and the ink return knife assembly 3 moves in the middle area of the guide rail 4. Further, the third driving member can be a driving motor. It should be understood Figure 4 It is only a schematic diagram for understanding and is not intended to specifically show the structure of each part.
[0063] In summary, there are various ways to achieve the controllable movement of the ink return blade assembly toward or away from the scraper assembly, which can be selected according to actual conditions. In this way, the solar cell printer can be applied to different application scenarios, thereby expanding its scope of application.
[0064] As a possible implementation, the distance between the scraper assembly and the ink return knife assembly is greater than or equal to 3 cm and less than or equal to 8 cm. For example, the distance between the scraper assembly and the ink return knife assembly can be 3 cm, 3.5 cm, 3.9 cm, 4 cm, 4.6 cm, 5 cm, 5.6 cm, 6 cm, 6.8 cm, 7 cm, 7.6 cm or 8 cm. Preferably, the maximum distance between the scraper assembly and the ink return knife assembly is 8 cm, and the minimum distance is 3 cm.
[0065] In the case of adopting the above technical solution, since the distance between the scraper assembly and the ink return knife assembly is greater than or equal to 3 cm, it can be known that the minimum distance between the scraper assembly and the ink return knife assembly is 3 cm, that is, the scraper assembly and the ink return knife assembly are spaced apart, and the scraper assembly and the ink return knife assembly can be prevented from influencing each other during actual use. Furthermore, since the distance between the scraper assembly and the ink return knife assembly is less than or equal to 8 cm, the ink return time of the ink return knife assembly can be shortened while ensuring that the thickness of the slurry between the scraper assembly and the ink return knife assembly is small, thereby improving work efficiency.
[0066] In the embodiment of the utility model, after the ink return blade assembly has finished returning ink, the distance between the ink return blade assembly and the scraper assembly is 3 cm. Alternatively, in the initial state, the distance between the ink return blade assembly and the scraper assembly is 3 cm.
[0067] After the scraper assembly reaches the lower blade position first, when the ink return knife assembly is at the preset position, the distance between the ink return knife assembly and the scraper assembly is 8 cm. That is, when the ink return knife assembly returns ink later, the distance between the ink return knife assembly and the scraper assembly gradually decreases from 8 cm to 3 cm.
[0068] The following describes the working conditions of the solar cell printer by taking a possible implementation as an example. It should be understood that the following description is only for understanding and is not intended to be a specific limitation.
[0069] See also Figures 1 to 8 When the solar cell printer is in the printing state, the scraper assembly 2 and the ink return knife assembly 3 are both located at the lower knife position a of the screen, the lifting member drives the ink return knife assembly 3 to rise, and the ink return knife assembly 3 is in the waiting position; the lifting member drives the scraper assembly 2 to descend, and the scraper assembly 2 is in the printing position (see Figure 7 ). Then, along the printing direction A, the printing head 1 drives the scraper assembly 2 and the ink return blade assembly 3 to move simultaneously. In this process, the scraper assembly 2 scrapes the slurry 5 for printing. After the printing is completed, the scraper assembly 2 and the ink return blade assembly 3 are located at the knife collection position b.
[0070] Next, the solar cell printer is in the ink return state, the lifting member drives the ink return blade assembly 3 to descend, and the ink return blade assembly 3 is in the ink return position; the lifting member drives the scraper assembly 2 to rise, and the scraper assembly 2 is in the waiting position (see Figure 8). Then, along the ink return direction B, the printing head 1 drives the scraper assembly 2 and the ink return knife assembly 3 to move from the knife collection position b to the lower knife position a. After the scraper assembly 2 and the ink return knife assembly 3 are both located at the preset positions (the distance between the scraper assembly 2 and the ink return knife assembly 3 is ignored at this time), the printing head 1 drives the scraper assembly 2 to reach the lower knife position a first. During this process, the ink return knife assembly 3 is always located at the preset position. Then, when the scraper assembly 2 reaches the lower knife position a, the ink return knife assembly 3 moves in the direction close to the scraper assembly 2, and the ink return knife assembly 3 returns ink. At the same time, the scraper assembly 2 descends and contacts the screen to block the slurry 5 recovered by the ink return knife assembly 3. For example, the above preset position is 8 cm away from the lower knife position.
[0071] Repeat the above operation to print and form metal grid lines on the silicon wafer. It should be understood that the above printing position, ink return position, waiting position, and preset position can be set according to actual conditions and are not specifically limited here.
[0072] In a second aspect, the embodiment of the utility model further provides a solar cell printing device, which includes a controller and the solar cell printing machine described in the above technical solution.
[0073] Since the solar cell printing device provided by the embodiment of the utility model includes the solar cell printer described in the above technical solution, in the solar cell printer, the ink return knife assembly 3 can be controlled to move toward or away from the scraper assembly 2 (that is, the distance between the ink return knife assembly 3 and the scraper assembly 2 can be adjusted) to level at least part of the slurry between the scraper assembly 2 and the ink return knife assembly 3. Specifically, in actual use, when the solar cell printer is in the ink return state, and the ink return knife assembly 3 is located very close to the scraper assembly 2 (that is, the ink return knife assembly 3 and the scraper assembly 2 are in the initial state), the printing head 1 drives the scraper assembly 2 and the ink return knife assembly 3 to move from the knife collection position b to the lower knife position a, and after the scraper assembly 2 and the ink return knife assembly 3 are simultaneously located at the preset position (the distance between the scraper assembly 2 and the ink return knife assembly 3 is ignored at this time), the printing head 1 drives the scraper assembly 2 to reach the lower knife position a first, and during this process, the ink return knife assembly 3 is always located at the preset position. Next, when the scraper assembly 2 reaches the lower blade position a, the ink return knife assembly 3 moves toward the scraper assembly 2 and the ink return knife assembly 3 returns ink. At the same time, the scraper assembly 2 descends and abuts against the screen to block the slurry 5 recovered by the ink return knife assembly 3.
[0074] Compared with the previous situation or the prior art where the ink return blade assembly 3 is located very close to the scraper assembly 2, in the embodiment of the utility model, the distance between the ink return blade assembly 3 and the scraper assembly 2 is gradually reduced until it returns to the initial state. At this time, in the process of the ink return blade assembly 3 gradually approaching the scraper assembly 2, part or most of the slurry 5 recovered by the ink return blade assembly 3 is gradually smoothed, so that the thickness of the slurry 5 between the scraper assembly 2 and the ink return blade assembly 3 is reduced compared with the prior art. When the thickness of the slurry 5 between the scraper assembly 2 and the ink return blade assembly 3 is reduced, the scraper assembly 2 can use as much or fully utilize the part of the slurry 5 as possible when scraping the slurry 5 again for printing, thereby reducing or clearing the content of the slurry 5 squeezed to the left and right sides of the scraper and the rear of the scraper assembly 2 by the scraper assembly 2, improving the utilization rate of the slurry 5, and reducing the production cost of the metal grid line. It should be understood that the above-mentioned preset position can be set according to the maximum distance between the scraper assembly 2 and the ink return blade assembly 3, and is not specifically limited here.
[0075] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.
[0076] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A solar cell printing machine, characterized in that: include: Printing head; A scraper assembly is movably disposed on the printing head; The ink return knife assembly is liftably arranged on the printing head, and the ink return knife assembly is located on one side of the scraper assembly; the ink return knife assembly can be controlled to move toward or away from the scraper assembly to smooth at least part of the slurry between the scraper assembly and the ink return knife assembly.
2. The solar cell printing machine according to claim 1, characterized in that: The solar cell printing machine further comprises: The lifting member is arranged on the printing head and is used for driving the scraper assembly and the ink return blade assembly to rise or fall respectively.
3. The solar cell printing machine according to claim 2, characterized in that: The printing head is provided with a groove, the length direction of the groove is consistent with the direction from the scraper assembly to the ink return knife assembly; one end of the ink return knife assembly is movably disposed in the groove; the ink return knife assembly can be controlled to approach or move away from the scraper assembly along the length direction of the groove.
4. The solar cell printing machine according to claim 3, characterized in that: The solar cell printing machine further comprises: The first driving member is connected to the ink return knife assembly and is used to drive the ink return knife assembly to approach or move away from the scraper assembly along the length direction of the groove.
5. The solar cell printing machine according to claim 2, characterized in that: The solar cell printing machine further comprises: A bidirectional screw rod is arranged on the lifting member, and the lifting member is used to drive the bidirectional screw rod to rise or fall; the length direction of the bidirectional screw rod is consistent with the direction from the scraper assembly to the ink return knife assembly, and one end of the ink return knife assembly is arranged on the bidirectional screw rod; The second driving member is connected to one end of the bidirectional screw rod and is used to drive the bidirectional screw rod to move.
6. The solar cell printing machine according to claim 2, characterized in that: The solar cell printing machine further comprises: A guide rail is arranged on the lifting member, and the lifting member is used to drive the guide rail to rise or fall; the guiding direction of the guide rail is consistent with the direction from the scraper assembly to the ink return knife assembly; one end of the ink return knife assembly is slidably connected to the guide rail; The third driving member is connected to the ink return knife assembly and is used to drive the ink return knife assembly to move along the guide direction of the guide rail.
7. The solar cell printing machine according to claim 1, characterized in that: The distance between the scraper assembly and the ink return knife assembly is greater than or equal to 3 cm and less than or equal to 8 cm.
8. The solar cell printing machine according to claim 1, characterized in that: The scraper assembly is parallel to the ink return knife assembly; the scraper assembly and the ink return knife assembly are spaced apart; The length direction of the scraper assembly is perpendicular to the printing direction of the scraper assembly; the length direction of the ink return knife assembly is perpendicular to the ink return direction of the ink return knife assembly; the printing direction is opposite to the ink return direction.
9. The solar cell printing machine according to claim 8, characterized in that: Along the printing direction, the ink return blade assembly is located in front of the scraper assembly.
10. A solar cell printing device, characterized in that: The invention comprises a controller and the solar cell printing machine according to any one of claims 1 to 9.