Slurry supply device for solar cell and screen printing system

Abstract

The utility model discloses a slurry supply device for a solar cell and a silk-screen printing system. The slurry supply device can comprise a driving part and a material supply part, and the driving part is connected with the material supply part and used for driving the material supply part to move on a silk screen; the material supply part comprises a material supply main body with a hollow structure, material outlets uniformly distributed on the material supply main body, and movable sealing pieces arranged on the material outlets; the feeding main body receives slurry conveyed from the outside; under the condition that the movable sealing piece is in contact with the silk screen, the movable sealing piece relieves sealing of the discharging opening, and the slurry flows out of the discharging opening to the silk screen; and after the movable sealing element leaves the silk screen, the movable sealing element seals the discharge hole. According to the slurry supply device, the slurry can be uniformly laid on the silk screen, and the slurry is prevented from staying on the silk screen for a long time, so that the performance of a metal electrode printed for a solar cell is effectively improved.

Description

Technical Field

[0001] The utility model relates to a slurry providing device and a screen printing system for solar cells. Background Art

[0002] Solar cell electrodes are typically produced using screen printing. This process primarily involves printing a conductive metal paste (such as silver paste) with specific properties and dimensions onto the solar cell's crystalline silicon substrate, creating a metal electrode with a specific shape and layout. Currently, the screen printing process primarily involves spreading the paste on a screen and then printing the paste onto the solar cell. This can lead to uneven distribution of the paste on the screen. Furthermore, prolonged exposure to the screen can lead to drying, which can affect the performance of the printed metal electrode. Utility Model Content

[0003] In view of this, the utility model provides a slurry providing device and screen printing system for solar cells, which can evenly spread the slurry on the screen and prevent the slurry from staying on the screen for a long time, so as to effectively improve the performance of the metal electrodes printed for solar cells.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a slurry supply device for solar cells, comprising: a driving part and a feeding part, wherein:

[0006] The driving part is connected to the feeding part and is used to drive the feeding part to move on the wire mesh;

[0007] The feeding part comprises: a feeding body with a hollow structure, discharge ports evenly distributed on the feeding body, and a movable sealing member provided on the discharge ports;

[0008] The feeding body receives slurry transported from the outside;

[0009] When the movable seal is in contact with the screen, the movable seal releases the seal on the discharge port, allowing the slurry to flow out of the discharge port onto the screen;

[0010] After the movable seal leaves the screen, the movable seal seals the discharge port.

[0011] In a second aspect, an embodiment of the present invention provides a screen printing system for solar cells, comprising: a screen and a slurry providing device provided in the embodiment of the first aspect, wherein:

[0012] The supply portion of the slurry supply device contacts the screen and rolls on the screen.

[0013] The technical solution of the first aspect of the above utility model has the following advantages or beneficial effects:

[0014] The slurry providing device for solar cells provided by the embodiment of the present invention drives the feeding part to roll on the silk screen through the driving part. The feeding part cooperates with the movable sealing part on the discharge port evenly distributed on the feeding main body to evenly flow the slurry in the feeding main body onto the silk screen, and can effectively control the amount of slurry flowing onto the silk screen. In addition, when the feeding part rolls on the silk screen, the slurry on the silk screen will be squeezed onto the solar cell under the silk screen, so as to avoid the slurry remaining on the silk screen for a long time, thereby effectively improving the performance of the metal electrode printed for the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a front view of a screen printing system for solar cells having a slurry providing device according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the relative relationship between the motor and the power conversion structure of the slurry providing device according to an embodiment of the present utility model;

[0017] Figure 3 This is a schematic diagram of the relative relationship between the first structure of the support frame and the feeding part in the slurry providing device according to an embodiment of the present utility model;

[0018] Figure 4 It is a structural diagram of the feeding part according to an embodiment of the utility model;

[0019] Figure 5 It is an exploded view of the relative relationship between the movable sealing member and the drum according to an embodiment of the present utility model.

[0020] The reference numerals are as follows:

[0021] 10-driving unit; 11-motor; 12-power conversion structure; 121-eccentric block; 122-movable connecting rod; 123-support frame; 1231-straight rod; 1232-sleeve; 1233-bracket; 1234-fixed block; 20-feeding unit; 21-feeding body; 211-roller; 212-distributing assembly; 2121-distributing barrel; 2122-limiting block; 213-feeding pipe; 22-discharge port; 221-sealing ring; 23-movable sealing member; 231-support structure; 2311-support rod; 2312-fixed plate; 2313-fixed rod; 232-sealing plug; 233-elastic member; 234-gasket; 30-first fixed frame; 31-sliding rod; 40-wire mesh; 50-mounting frame; 60-second fixed frame; 70-mounting block. DETAILED DESCRIPTION

[0022] The slurry providing device involved in the embodiment of the present utility model is applied to the technical field of solar cell. It cooperates with the screen to realize the printing of grid lines (main grid and / or fine grid of solar cell) on the solar cell for preparing the solar cell.

[0023] The connection between two structures involved in the embodiments of the present invention generally refers to direct or indirect contact between the two structures, and an associated relationship exists between the two structures. For example, the connection between the driving unit 10 and the feeding unit 20 means that the driving unit 10 and the feeding unit 20 are in direct or indirect contact, and the associated relationship between the driving unit 10 and the feeding unit 20 is that the driving unit 10 drives the feeding unit 20. For another example, the connection between the power conversion structure 12 and the feeding body 21 means that the power conversion structure 12 and the feeding body 21 are in direct or indirect contact, and the power conversion structure 12 drives the feeding body 21.

[0024] The slurry involved in the embodiment of the present invention is a slurry used for printing the main grid and / or fine grid of a solar cell. The slurry can be selected according to the requirements of the solar cell. In the embodiment of the present invention, the specific composition of the slurry is not limited.

[0025] The fixed connection of two structures in the embodiments of the present invention generally means that the two structures are in direct or indirect contact, and the directly or indirectly contacting portions of the two structures are relatively fixed. For example, the fixed connection of one end of the eccentric mass 121 to the output end of the motor 11 means that one end of the eccentric mass 121 is in direct or indirect contact with the output end of the motor, and one end of the eccentric mass 121 is relatively fixed to the output end of the motor.

[0026] In the embodiments of the present invention, the articulation of two structures means that the two structures are in direct or indirect contact with each other and can move relative to each other. For example, the articulation of the support frame 123 with the mounting frame 50 of the screen printing system means that the support frame 123 is in direct or indirect contact with the mounting frame 50 and can move relative to each other.

[0027] It is worth noting that the terms "first," "second," and so on, used in the embodiments of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific number or order. It should be understood that the terms used in this manner are interchangeable where appropriate. This is merely a way of distinguishing objects with the same attributes in the embodiments of the present invention.

[0028] The embodiment of the utility model Figure 1 A front view of a screen printing system for solar cells with a slurry providing device provided in an embodiment of the present invention is shown; Figure 2 A schematic diagram showing a relative relationship between a motor and a power conversion structure of a slurry providing device according to an embodiment of the present utility model; Figure 3 A schematic diagram showing the relative relationship between the first structure of the support frame and the feeding part in the slurry providing device according to an embodiment of the present invention; Figure 4 A first structural diagram of the feeding portion of an embodiment of the present utility model is shown; Figure 5 An exploded view showing the relative relationship between the movable seal and the drum according to an embodiment of the present invention.

[0029] The present invention provides a slurry supply device for solar cells. Figures 1 to 3 As shown, the slurry providing device may include: a driving part 10 and a feeding part 20, wherein,

[0030] The driving unit 10 is connected to the feeding unit 20 and is used to drive the feeding unit 20 to move on the screen 40;

[0031] The feeding part 20 may include: a feeding body 21 with a hollow structure, discharge ports 22 evenly distributed on the feeding body 21, and a movable sealing member 23 provided on the discharge ports 22; wherein,

[0032] The feeding body 21 receives the slurry transported from the outside;

[0033] When the movable seal 23 is in contact with the screen 40 , the movable seal 23 releases the seal on the discharge port 22 , allowing the slurry to flow out of the discharge port 22 onto the screen 40 ;

[0034] After the movable seal 23 leaves the screen 40 , the movable seal 23 seals the discharge port 22 .

[0035] In the process of the driving unit 10 driving the feeding unit 20 to move on the screen 40, the feeding unit 20 will also generate downward pressure on the screen 40, and the slurry on the screen 40 is squeezed by the pressure, so that the slurry passes through the screen 40 and is printed onto the solar cell used to form the solar cell.

[0036] In addition, a corresponding movable seal 23 is provided for each discharge port 22. For each discharge port 22, when the discharge port 22 is not in contact with the screen 40, the movable seal 23 seals the discharge port 22, so that the slurry cannot flow out of the discharge port 22. When the discharge port 22 is in contact with the screen 40, the movable seal 23 will release its seal on the discharge port 22, so that the slurry flows out from the unsealed discharge port 22. In other words, the slurry only flows out from the discharge port 22 in contact with the screen 40, avoiding the slurry from flowing onto the feed body 21, so as to avoid the slurry from contaminating the outer wall of the feed body 21 and wasting the slurry. In addition, by preventing the slurry from contaminating the outer wall of the feed body 21, it is possible to avoid the slurry from sticking to the feed part 20 during the process of moving and extruding the slurry, thereby ensuring that the slurry extruded onto the solar cell is uniform.

[0037] Furthermore, in order to prevent the feeding part 20 provided in the embodiment of the present invention from being adhered to the slurry, the feeding part 20 is generally made of a material that will not be adhered to the slurry, such as polytetrafluoroethylene, glass, ceramic, PI latex, etc.

[0038] Among them, the distribution density and the size range of the discharge ports evenly distributed on the feeding body 21 are set according to the solid content, solid particle size and viscosity in the slurry. Generally, for the main grid slurry, the solid content is low, so the distribution density is slightly smaller. The distribution density calculated based on the entire block of the feeding body 21 is 20 to 60% of the surface area of ​​the feeding body 21, preferably 40%. For the fine grid slurry, the solid content is higher, so the distribution density is slightly larger. The distribution density calculated based on the entire block of the feeding body 21 is 40 to 80%, preferably 60%. In addition, the diameter of the discharge port is generally 1 mm to 5 mm, preferably 2 mm.

[0039] The slurry providing device for solar cells provided by the embodiment of the present utility model drives the feeding part to roll on the silk screen through the driving part. The feeding part cooperates with the movable sealing part on the discharge port evenly distributed on the feeding main body to evenly flow the slurry in the feeding main body onto the silk screen, and can effectively control the amount of slurry flowing onto the silk screen. In addition, when the feeding part rolls on the silk screen, the slurry on the silk screen will be squeezed onto the solar cell under the silk screen, avoiding the slurry remaining on the silk screen for a long time, thereby effectively improving the printing quality and thus improving the performance of the metal electrode printed on the solar cell.

[0040] Specifically, with respect to the above-mentioned driving unit 10, as Figures 1 to 3As shown, the driving unit 10 may include: a motor 11 and a power conversion structure 12, wherein:

[0041] The power conversion structure 12 connects the motor 11 and the feeding body 21 and is used to convert the rotational force of the motor 11 into a driving force for driving the feeding body 21 to move linearly back and forth;

[0042] The feeding body 21 is driven by the driving force to move linearly on the screen 40 , and relative friction occurs between the feeding body 21 and the screen 40 , causing the feeding body 21 to rotate.

[0043] The power conversion structure 12 converts the driving force of the motor 11 into the driving force for driving the feeding body 21 to move linearly, so that the feeding body 21 can come into contact with all positions of the screen 40, ensuring that the slurry flowing out of the feeding body 21 can be evenly distributed at all positions of the screen 40.

[0044] During the operation of the slurry supply device, the supply body 21 rotates, so that the slurry flowing out of the discharge ports 22 evenly distributed on the supply body 21 can be evenly laid on the screen 40 .

[0045] The amounts of slurry discharged from the various discharge ports 22 on the feeding body 21 are substantially the same, which can further evenly distribute the slurry on the screen.

[0046] Specifically, there are two structures for the power conversion structure 12 .

[0047] For example, the first structure of the power conversion structure 12 is as follows: Figures 1 to 3 As shown, the power conversion structure 12 may include: an eccentric block 121, a movable connecting rod 122 and a support frame 123, wherein:

[0048] One end of the eccentric block 121 is fixedly connected to the output end of the motor 11, and the other end is movably connected to one end of the movable connecting rod 122;

[0049] The other end of the movable connecting rod 122 is movably connected to the support frame 123;

[0050] The support frame 123 is movably connected to the mounting frame 50 of the screen printing system, and the support frame 123 is movably connected to the feeding body 21;

[0051] With the cooperation of the motor 11 , the eccentric block 121 and the movable connecting rod 122 , the support frame 123 reciprocates linearly along the mounting frame 50 and drives the feeding body 21 to reciprocate linearly.

[0052] The design of the eccentric block 121 can improve the conversion efficiency of the driving force of the motor 11 and reduce energy consumption.

[0053] The first structure of the above-mentioned power conversion structure 12 is movably connected to the mounting frame 50 of the screen printing system through the movable connecting rod 122 and the support frame 123. Under the guidance of the support frame 123, the feeding body 21 can move stably in a straight line, and the feeding body 21 can provide stable pressure for the screen 40, ensuring stable extrusion of the screen 40.

[0054] In addition, the second structure of the power conversion structure 12: it may also include the above-mentioned eccentric block 121, the movable connecting rod 122, a slider connected to the movable connecting rod 122 (not shown in the figure) and a sliding track (not shown in the figure) arranged on the mounting frame 50 of the screen printing system, wherein the slider is embedded in the sliding track and is used to move back and forth in a straight line along the sliding track under the drive of the movable connecting rod 122.

[0055] Furthermore, with respect to the first structure of the power conversion structure 12, as Figure 1 As shown, the slurry providing device further includes: two first fixing frames 30 including sliding rods 31, wherein:

[0056] Two first fixing frames 30 are fixed to the mounting frame 50, and the sliding rods 31 included in the first fixing frames 30 are parallel to each other; the two sliding rods 31 are located on either side of the screen 40; and the support frame 123 is slidably connected to the two sliding rods 31. This structure enables the power conversion structure 12 to be installed on the mounting frame 50. By disassembling the first fixing frames 30, the power conversion structure 12 and the first fixing frames 30 can be removed as a whole, facilitating the disassembly and installation of the slurry supply device on the solar cell preparation system.

[0057] In addition, the support frame 123 may include two structures.

[0058] Specifically, the first structure of the support frame 123 is as follows: Figures 1 to 3 As shown, the support frame 123 may include: a straight rod 1231, a sleeve 1232 provided at both ends of the straight rod 1231, and two sub-brackets 1233, wherein the other end of the movable connecting rod 122 is movably connected to the straight rod 1231; the two sleeves 1232 are respectively sleeved on the two sliding rods 31; and the two sub-brackets 1233 are respectively movably connected to the two ends of the feeding body 21.

[0059] For example, the second structure of the support frame 123 differs from the first structure in that the sleeve 1232 in the first structure is replaced by a slider, and a sliding track for assembling the slider is designed on the slide rod 31, so that the slider slides on the sliding track, driving the two sub-brackets 1233 to move, and the two sub-brackets 1233 drive the feeding body 21 to move.

[0060] In particular, for the first structure of the support frame 123, as Figures 1 to 3 As shown, the support frame 123 may further include a fixing block 1234 provided in the middle of the straight rod 1231, wherein the other end of the movable connecting rod 122 is movably connected to the fixing block 1234. The fixing block 1234 facilitates the installation of the movable connecting rod 122 on the straight rod 1231.

[0061] In addition, the feeding body 21 in the slurry feeding device provided in the embodiment of the present utility model can also have two implementation structures.

[0062] Specifically, for the feeding body 21, as Figure 4 As shown, the feeding body 21 may include: a roller 211, a hollow-structured material distribution assembly 212 disposed within the roller 211, and a feed pipe 213 communicating with the interior of the material distribution assembly 212. Discharge ports are evenly distributed on the roller 211; the feed pipe 213 is used to transfer the slurry into the material distribution assembly 212; and the material distribution assembly 212 has evenly distributed feed ports for distributing the slurry into the roller 211. The cooperation between the material distribution assembly 212 and the roller 211 can further ensure that the slurry is evenly distributed on the screen 40.

[0063] It is worth mentioning that Figure 4 The cylindrical structure of the material distribution component 212 is given for illustrative purposes only. The material distribution component 212 may also be in other shapes such as a rectangular parallelepiped.

[0064] Furthermore, the above-mentioned material dividing component 212 can have two structures.

[0065] Specifically, for the first structure of the material distribution component 212, such as Figure 4 As shown, the above-mentioned material distribution component 212 may include: a material distribution cylinder 2121 and limit blocks 2122 respectively provided at both ends of the material distribution cylinder, wherein,

[0066] The material distribution cylinder 2121 is nested in the drum 211;

[0067] The two limiting blocks 2122 extend from both ends of the roller 211 and are movably connected to both ends of the roller 211;

[0068] The two limiting blocks 2122 are movably connected to the driving part 10 .

[0069] The two limit blocks 2122 are movably connected to the two ends of the roller 211, so that the material distribution barrel 2121 and the roller 211 can rotate relative to each other, and the roller 211 can rotate on its own during the linear movement on the screen 40.

[0070] Furthermore, by movably connecting the two limit blocks 2122 to the drive unit 10, the feed barrel 2121 can also rotate, so that the position of the feed opening on the feed barrel 2121 is constantly changing, thereby allowing the slurry to flow out of different feed openings into the drum 211, avoiding the problem of insufficient slurry supply caused by slurry blocking the feed opening. In addition, the position of the feed opening is constantly changing, that is, the feed opening located at the bottom will be rotated to the top, which can allow the slurry blocking the feed opening to flow back into the feed barrel 2121, so that the feed opening can be continuously kept unobstructed.

[0071] In addition, by designing two limit blocks 2122 to be movably connected to the driving part 10, the distributing barrel 2121 is allowed to roll to further mix and stir the slurry, ensuring that the various components of the slurry are more uniform.

[0072] For the first configuration of the dispensing assembly 212, the size and distribution density of the dispensing opening of the dispensing assembly are set to be 10-30% larger than the size of the dispensing opening on the drum 211, preferably 20%. The distribution density of the dispensing opening of the dispensing assembly is also set to be 10-30% larger than the distribution density of the dispensing opening on the drum 211, preferably 20%. This ensures that sufficient slurry can continuously reach the dispensing opening of the drum, but not too much, as this can easily cause the slurry to dry out in the inner ring.

[0073] Regarding the second structure of the material distribution component 212, the material distribution component 212 is fixedly connected to the above-mentioned sub-bracket 1233, and the material distribution component 212 will not rotate. The feed openings are evenly distributed below the material distribution component 212, that is, the slurry is continuously distributed to the drum 211 through the feed openings below the material distribution component 212.

[0074] Preferably, the material distribution component 212 is of the first structure mentioned above, which can ensure that the feed port can remain unobstructed.

[0075] Furthermore, in order to seal the discharge port 22 and facilitate the regulation of the sealing and unsealing of the discharge port 22, as shown in FIG. Figure 5 As shown, the above-mentioned movable sealing member 23 may include: a supporting structure 231, a sealing plug 232, an elastic member 233 and a gasket 234, wherein the supporting structure 231 is arranged at the discharge port 22 and fixed to the inner wall of the feeding body 21; one end of the elastic member 233 is fixed to the supporting structure 231; the sealing plug 232 matches the discharge port 22 and is used to seal the discharge port 22; the gasket 234 is arranged between the sealing plug 232 and the other end of the elastic member 233, and is used to squeeze the elastic member 233 to shrink when squeezed by the sealing plug 232.

[0076] The elastic member 233 may be a telescopic spring or other structures similar to a telescopic spring that can deform under relatively small pressure and recover after the pressure is released.

[0077] When the movable seal 23 contacts the screen 40, it is subjected to pressure in a direction away from the screen 40, causing the elastic member 233 to deform, squeezing the sealing plug 232, and releasing the seal from the discharge port 22. Once the movable seal 23 leaves the screen 40, the elastic member 233 recovers, driving the sealing plug 232 back into the discharge port 22, thereby sealing the discharge port 22. Furthermore, by providing a gasket 234 between the sealing plug 232 and the elastic member 233, the elastic force of the elastic member 233 is applied to the gasket 234. The gasket 234 evenly distributes the force to all positions of the sealing plug 232, evenly applying force to the sealing plug 232 and ensuring that the sealing plug 232 can accurately seal the discharge port 22.

[0078] In addition, through the above structure, the sealing plug 232 can smoothly abut against the screen 40 when the roller 211 rolls, and can gradually move inward from one side of the sealing plug 231 to the other side during the abutment process. The gap between the sealing plug 232 and the discharge port 23 can gradually open, so that the slurry can flow out evenly from the gap. In this process, the driving unit 10 is used to control the roller to move at a uniform speed, and the gap between the sealing plug 231 and the discharge port 23 changes in an orderly and uniform manner. As the roller 211 continues to roll, the degree of opening of the gap also changes continuously, thereby realizing continuous and uniform outflow of the slurry. This design ensures the uniform distribution of the slurry during the printing process and avoids the situation where the slurry suddenly gushes out in large quantities or the outflow is insufficient at a certain moment.

[0079] More specifically, if Figure 5 As shown, the above-mentioned support structure 231 may include: multiple support rods 2311, fixed plates 2312 and fixed rods 2313, wherein the multiple support rods 2311 are arranged around the discharge port 22 and fixed to the inner wall of the feeding body 21; the fixed plate 2312 is fixedly connected to the multiple support rods 2311; one end of the fixed rod 2313 is fixed on the fixed plate 2312, and the fixed rod 2313 is arranged corresponding to the discharge port 22; one end of the elastic member 233 is fixed on the fixed plate 2312 and nested in the fixed rod 2313; the gasket 234 is movably connected to the other end of the fixed rod 2313.

[0080] By arranging a plurality of support rods 2311 around the discharge port 22 , on the one hand, it is convenient for the slurry to flow out; on the other hand, the plurality of support rods 2311 cooperate with the fixing plate 2312 to disperse the elastic impact caused by the contraction process of the elastic member 233 , thereby effectively improving the service life of the movable seal 23 .

[0081] In addition, by designing the fixing rod 2313 , on the one hand, the gasket 234 can be limited to prevent the gasket 234 from shifting, and on the other hand, the elastic member 233 can be limited to prevent the movable seal 23 from being damaged due to the shift of the elastic member 233 .

[0082] During the assembly of the movable seal 23 , the gasket 234 is first sleeved on the fixing rod 2313 , and then the fixing rod 2313 passes through the elastic member 233 fixed on the fixing plate 2312 , and the fixing rod 2313 is fixed to the fixing plate 2312 .

[0083] Furthermore, if Figure 5 As shown, a sealing ring 221 may be provided on the discharge port 22 to cooperate with the movable sealing member 23 to further enhance the sealing of the discharge port 22 .

[0084] Specifically, the slurry supply device provided in the above embodiment operates as follows: the eccentric mass 21 is driven to rotate by the motor 11. The rotation of the eccentric mass 21 causes the movable connecting rod 122 to move back and forth along with the rotation of the eccentric mass 21. The back and forth movement of the movable connecting rod 122 drives the support frame 123 to move linearly back and forth, and the support frame 123 drives the feeding body 21 to also move linearly back and forth. In addition, because the roller 211 of the feeding body 21 is movably connected to the limit block 2122 of the material distribution assembly 212, when the roller 211 contacts the screen 40, mutual friction is generated, causing the roller 211 to roll along the limit block 2122. Furthermore, the limit block 2122 of the material distribution assembly 212 is movably connected to the support frame 123. Due to the mutual friction between the limit block 2122 and the support frame 123, the material distribution barrel 2121 of the material distribution assembly 212 also rotates about the axial direction. The material distribution component 212 receives the slurry transported by the delivery pipe 213 and disperses the slurry into the roller 211. During the contact between the roller 211 and the screen 40, the movable seal 23 is squeezed, and the movable seal 23 releases the seal on the discharge port 22, allowing the slurry to flow out from the unsealed discharge port 22 onto the screen 40.

[0085] Furthermore, the embodiment of the present invention also provides a screen printing system for solar cells. Figure 1 The screen printing system may include: a screen 40 and a slurry providing device according to the above embodiment, wherein:

[0086] The feed portion 20 of the slurry supply device is in contact with the screen 40 and rolls on the screen 40 .

[0087] Furthermore, if Figure 1 As shown, the screen printing system further includes: a mounting frame 50 and a second fixing frame 60 fixed on the mounting frame 50, wherein:

[0088] The mounting frame 50 is used to fix the first mounting frame 30 of the slurry providing device;

[0089] The second fixing bracket 60 is used to fix the motor 11 of the slurry supply device.

[0090] In addition, if Figure 1 As shown, the screen printing system may further include: a mounting block 70 , on which the main body of the motor 11 may be fixed to ensure that the motor 11 is securely mounted.

[0091] Specifically, the slurry providing system provided in the above embodiment is based on the principle of printing grid lines for solar cells: the above slurry providing device evenly casts the slurry onto the screen 40, and during the rolling process of the slurry providing device, the slurry cast onto the screen 40 is squeezed onto the solar cells under the screen 40 to print grid lines for the solar cells.

[0092] The pattern of the screen 40 can be selected and changed according to the demand for printing grid lines of solar cells.

[0093] Furthermore, the embodiment of the present invention also provides a screen printing method for solar cells implemented based on the screen printing system provided in the above embodiment, comprising:

[0094] Step 1: The driving unit 10 of the slurry supply device drives the feeding unit 20 to roll on the screen 40, so that the movable seal 23 in the contact area of ​​the feeding unit 20 with the screen 40 releases the seal on the discharge port 22, and the slurry in the feeding unit 20 flows out of the discharge port 22 onto the screen 40;

[0095] Step 2: The feeding unit 20 squeezes the slurry flowing onto the screen 40 , so that the slurry passes through the screen 40 and is printed on the solar cells below the screen 40 .

[0096] The screen printing method can evenly distribute the slurry on the screen 40 and prevent a large amount of slurry from accumulating on the screen 40. In addition, the slurry providing device cooperates with the screen 40 to print the slurry onto the solar cell.

[0097] Specifically, the specific implementation method of the above step 1 is: using the power conversion structure 12 of the driving part 10 to convert the received rotational force of the motor 11 into a linear driving force, and driving the feeding body 21 of the feeding part 20 to reciprocate linearly by the linear driving force; using the friction between the feeding body 21 and the wire mesh 40, the feeding body 21 is caused to rotate while reciprocating linearly, so that the movable seals 23 uniformly arranged on the circumference of the feeding body 21 are alternately in contact with the wire mesh 40, so that the slurry flows out alternately from each discharge port 22 in the circumferential direction.

[0098] The movable seal 23 alternately contacts the screen 40 , and the slurry alternately flows out from the various discharge ports 22 in the circumferential direction, thereby ensuring the uniformity of the slurry on the screen 40 and preventing the discharge ports 22 from being blocked by the slurry.

[0099] In summary, the embodiments of the present invention provide the following technical solutions:

[0100] Technical Solution 1: A slurry supply device for solar cells, comprising: a driving unit 10 and a feeding unit 20, wherein:

[0101] The driving part 10 is connected to the feeding part 20 and is used to drive the feeding part 20 to move on the screen 40;

[0102] The feeding part 20 includes: a feeding body 21 of a hollow structure, discharge ports 22 evenly distributed on the feeding body 21, and a movable sealing member 23 provided on the discharge ports 22;

[0103] The feeding body 21 receives the slurry transported from the outside;

[0104] When the movable seal 23 contacts the screen 40 , the movable seal 23 releases the seal on the discharge port 22 , allowing the slurry to flow out of the discharge port 22 onto the screen 40 .

[0105] After the movable seal 23 leaves the screen 40 , the movable seal 23 seals the discharge port 22 .

[0106] Technical Solution 2: According to the slurry providing device of Technical Solution 1, the driving unit 10 includes: a motor 11 and a power conversion structure 12, wherein:

[0107] The power conversion structure 12 connects the motor 11 and the feeding body 21 and is used to convert the rotational force of the motor 11 into a driving force that drives the feeding body 21 to move linearly back and forth;

[0108] Driven by the driving force, the feeding body 21 moves linearly on the screen 40 , and relative friction occurs between the feeding body 21 and the screen 40 , causing the feeding body 21 to rotate.

[0109] Technical Solution 3: According to the slurry providing device described in Technical Solution 2, the power conversion structure 12 includes: an eccentric block 121, a movable connecting rod 122 and a support frame 123, wherein:

[0110] One end of the eccentric block 121 is fixedly connected to the output end of the motor 11, and the other end is movably connected to one end of the movable connecting rod 122;

[0111] The other end of the movable connecting rod 122 is movably connected to the supporting frame 123;

[0112] The support frame 123 is movably connected to the mounting frame 50 of the screen printing system, and the support frame 123 is movably connected to the feeding body 21;

[0113] Under the cooperation of the motor 11 , the eccentric block 121 and the movable connecting rod 122 , the support frame 123 reciprocates linearly along the mounting frame 50 and drives the feeding body 21 to reciprocate linearly.

[0114] Technical Solution 4: The slurry providing device according to Technical Solution 3 further includes: two first fixing frames 30 including sliding rods 31, wherein:

[0115] The two first fixing frames 30 are fixed on the mounting frame 50 , and the sliding rods 31 included in the first fixing frames 30 are parallel to each other;

[0116] The two sliding rods 31 are respectively located on both sides of the screen 40;

[0117] The support frame 123 is slidably connected to the two sliding rods 31 .

[0118] Technical Solution 5: According to the slurry providing device described in Technical Solution 4, the support frame 123 includes: a straight rod 1231, sleeves 1232 provided at both ends of the straight rod 1231, and two sub-brackets 1233, wherein:

[0119] The other end of the movable connecting rod 122 is movably connected to the straight rod 1231;

[0120] The two sleeves 1232 are respectively sleeved on the two sliding rods 31;

[0121] The two sub-brackets 1233 are movably connected to both ends of the feeding body 21 respectively.

[0122] Technical Solution 6: According to the slurry providing device of Technical Solution 5, the support frame 123 further includes: a fixed block 1234 provided in the middle position of the straight rod 1231, wherein:

[0123] The other end of the movable connecting rod 122 is movably connected to the fixing block 1234 .

[0124] Technical Solution 7: According to the slurry providing device according to any one of Technical Solutions 1 to 6, the feeding body 21 comprises: a roller 211, a hollow material distribution component 212 disposed in the roller 211, and a material delivery pipe 213 connected to the interior of the material distribution component 212, wherein:

[0125] The discharge ports are evenly distributed on the roller 211;

[0126] The delivery pipe 213 is used to transfer the slurry to the material distribution component 212;

[0127] The material distribution assembly 212 is evenly distributed with feed ports for distributing the slurry into the drum 211 .

[0128] Technical Solution 8: According to the slurry providing device of Technical Solution 7, the material distribution component 212 includes: a material distribution cylinder 2121 and limit blocks 2122 respectively provided at both ends of the material distribution cylinder, wherein:

[0129] The material distribution cylinder 2121 is nested in the drum 211;

[0130] The two limiting blocks 2122 extend from both ends of the roller 211 and are movably connected to both ends of the roller 211;

[0131] The two limiting blocks 2122 are movably connected to the driving unit 10 .

[0132] Technical Solution 9: According to the slurry providing device described in any one of Technical Solutions 1 to 6 and 7, the movable sealing member 23 includes: a supporting structure 231, a sealing plug 232, an elastic member 233 and a gasket 234, wherein:

[0133] The support structure 231 is disposed at the discharge port 22 and fixed to the inner wall of the feeding body 21;

[0134] One end of the elastic member 233 is fixed to the supporting structure 231;

[0135] The sealing plug 232 matches the discharge port 22 and is used to seal the discharge port 22;

[0136] The gasket 234 is disposed between the sealing plug 232 and the other end of the elastic member 233 , and is used to squeeze the elastic member 233 to contract when squeezed by the sealing plug 232 .

[0137] Technical Solution 10: According to the slurry providing device of Technical Solution 9, the support structure 231 includes: a plurality of support rods 2311, a fixing sheet 2312 and a fixing rod 2313, wherein:

[0138] The plurality of support rods 2311 are arranged around the discharge port 22 and fixed to the inner wall of the feeding body 21;

[0139] The fixing plate 2312 is fixedly connected to the plurality of support rods 2311;

[0140] One end of the fixing rod 2313 is fixed to the fixing plate 2312 , and the fixing rod 2313 is arranged corresponding to the discharge port 22 ;

[0141] One end of the elastic member 233 is fixed to the fixing plate 2312 and nested in the fixing rod 2313;

[0142] The gasket 234 is movably connected to the other end of the fixing rod 2313 .

[0143] Technical solution 11, a screen printing system for solar cells, comprising: a screen 40 and a slurry providing device according to any one of technical solutions 1 to 10, wherein:

[0144] The feeding portion 20 of the slurry supplying device contacts the screen 40 and rolls on the screen 40 .

[0145] Technical Solution 12: The screen printing system according to Technical Solution 11 further includes: a mounting frame 50 and a second fixing frame 60 fixed on the mounting frame 50, wherein:

[0146] The mounting frame 50 is used to fix the first fixing frame 30 of the slurry providing device;

[0147] The second fixing bracket 60 is used to fix the motor 11 of the slurry providing device.

[0148] The above steps are merely provided to help understand the method, structure, and core concept of the present invention. A person skilled in the art would be able to make improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications would also fall within the scope of protection of the claims of the present invention.

Claims

1. A slurry providing device for solar cells, characterized in that: include: A driving part (10) and a feeding part (20), wherein The driving part (10) is connected to the feeding part (20) and is used to drive the feeding part (20) to move on the screen (40); The feeding portion (20) comprises: a feeding body (21) with a hollow structure, discharge ports (22) evenly distributed on the feeding body (21), and a movable sealing member (23) provided on the discharge ports (22); The feeding body (21) receives slurry transported from the outside; When the movable seal (23) is in contact with the screen (40), the movable seal (23) releases the seal on the discharge port (22), allowing the slurry to flow out of the discharge port (22) onto the screen (40); After the movable seal (23) leaves the screen (40), the movable seal (23) seals the discharge port (22).

2. The slurry providing device according to claim 1, characterized in that: The driving unit (10) includes: a motor (11) and a power conversion structure (12), wherein: The power conversion structure (12) is connected to the motor (11) and the feeding body (21), and is used to convert the rotational force of the motor (11) into a driving force for driving the feeding body (21) to move linearly back and forth; Driven by the driving force, the feeding body (21) moves linearly on the wire mesh (40), and relative friction occurs between the feeding body (21) and the wire mesh (40), causing the feeding body (21) to rotate.

3. The slurry providing device according to claim 2, characterized in that: The power conversion structure (12) comprises an eccentric block (121), a movable connecting rod (122) and a support frame (123), wherein: One end of the eccentric block (121) is fixedly connected to the output end of the motor (11), and the other end is movably connected to one end of the movable connecting rod (122); The other end of the movable connecting rod (122) is movably connected to the supporting frame (123); The support frame (123) is movably connected to the mounting frame (50) of the screen printing system, and the support frame (123) is movably connected to the material feeding body (21); Under the cooperation of the motor (11), the eccentric block (121) and the movable connecting rod (122), the support frame (123) moves back and forth linearly along the mounting frame (50), and drives the feeding body (21) to move back and forth linearly.

4. The slurry providing device according to claim 3, characterized in that: Also includes: Two first fixing frames (30) including slide bars (31), wherein: The two first fixing frames (30) are fixed on the mounting frame (50), and the sliding rods (31) included in the first fixing frames (30) are parallel to each other; The two sliding rods (31) are respectively located on both sides of the wire mesh (40); The support frame (123) is slidably connected to the two sliding rods (31).

5. The slurry providing device according to claim 4, characterized in that: The support frame (123) includes: a straight rod (1231), sleeves (1232) respectively arranged at both ends of the straight rod (1231), and two sub-brackets (1233), wherein: The other end of the movable connecting rod (122) is movably connected to the straight rod (1231); The two sleeves (1232) are respectively sleeved on the two sliding rods (31); The two sub-brackets (1233) are movably connected to the two ends of the feeding body (21) respectively.

6. The slurry supply device according to claim 5, characterized in that: The support frame (123) further includes: a fixing block (1234) arranged in the middle position of the straight rod (1231), wherein: The other end of the movable connecting rod (122) is movably connected to the fixed block (1234).

7. The slurry providing device according to any one of claims 1 to 6, characterized in that: The feeding body (21) comprises: a roller (211), a hollow-structured material distribution component (212) disposed in the roller (211), and a material delivery pipe (213) communicating with the interior of the material distribution component (212), wherein: The discharge ports are evenly distributed on the roller (211); The delivery pipe (213) is used to transfer the slurry into the material distribution component (212); The material distribution assembly (212) is evenly distributed with feed ports for distributing the slurry into the drum (211).

8. The slurry supply device according to claim 7, characterized in that: The material distribution assembly (212) comprises: a material distribution cylinder (2121) and limit blocks (2122) respectively arranged at both ends of the material distribution cylinder, wherein: The material distribution cylinder (2121) is nested in the drum (211); The two limiting blocks (2122) extend from both ends of the roller (211) and are movably connected to both ends of the roller (211); The two limit blocks (2122) are movably connected to the driving part (10).

9. The slurry providing device according to any one of claims 1 to 6 and 7, characterized in that: The movable sealing member (23) comprises: a supporting structure (231), a sealing plug (232), an elastic member (233) and a gasket (234), wherein: The support structure (231) is arranged at the discharge port (22) and fixed to the inner side wall of the feeding body (21); One end of the elastic member (233) is fixed to the supporting structure (231); The sealing plug (232) matches the discharge port (22) and is used to seal the discharge port (22); The gasket (234) is arranged between the sealing plug (232) and the other end of the elastic member (233), and is used to squeeze the elastic member (233) to shrink when squeezed by the sealing plug (232).

10. The slurry supply device according to claim 9, characterized in that: The support structure (231) includes: a plurality of support rods (2311), a fixing plate (2312) and a fixing rod (2313), wherein: A plurality of support rods (2311) are arranged around the discharge port (22) and fixed to the inner side wall of the feeding body (21); The fixing plate (2312) is fixedly connected to the plurality of support rods (2311); One end of the fixing rod (2313) is fixed to the fixing plate (2312), and the fixing rod (2313) is arranged corresponding to the discharge port (22); One end of the elastic member (233) is fixed on the fixing plate (2312) and nested in the fixing rod (2313); The gasket (234) is movably connected to the other end of the fixing rod (2313).

11. A screen printing system for solar cells, comprising: The screen (40) and the slurry providing device according to any one of claims 1 to 10, wherein: The feeding portion (20) of the slurry supply device contacts the screen (40) and rolls on the screen (40).

12. The screen printing system according to claim 11, wherein: Also includes: A mounting frame (50) and a second fixing frame (60) fixed on the mounting frame (50), wherein: The mounting frame (50) is used to fix the first fixing frame (30) of the slurry providing device; The second fixing frame (60) is used for fixing and mounting the motor (11) of the slurry providing device.

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