Multi-layer filtering equipment for processing back silver paste of crystalline silicon photovoltaic cell

Abstract

The invention discloses multi-layer filtering equipment for processing silver paste on the back of a crystalline silicon photovoltaic cell, and relates to the technical field of filtering equipment. The existing equipment does not carry out precipitation treatment for a certain time, so that part of fine particles which cannot be filtered out are guided out, the filtering effect is influenced, an inclined guide cover is matched with a conical cover, the filtered slurry is blocked by the conical cover in the process of guiding and filtering the slurry, so that the slurry flows downwards along the inner wall of the conical cover, and the filtering effect is influenced. In the flowing process, the slurry is guided and conveyed to the central position through the inclined guide cover, so that the slurry which is just filtered is concentrated in the central position, the slurry which is precipitated for a certain time is concentrated on the outer side, and the slurry overflows from the through groove and is guided out through the slurry outlet pipe in the process that the liquid level gradually rises; the filtered slurry is precipitated for a certain time and then is guided out and collected, so that the slurry is prevented from being directly guided out.

Description

Technical Field

[0001] The present invention relates to the technical field of filtering equipment, in particular to a multi-layer filtering equipment for processing silver paste on the back side of a crystalline silicon photovoltaic cell. Background Art

[0002] Silver paste on the back of crystalline silicon photovoltaic cells is a functional electronic paste used to prepare the back electrode of crystalline silicon solar cells. It is one of the key materials in the production of photovoltaic cells. It is attached to the back of the cell through printing, sintering and other processes. It is mainly used to collect and conduct current and connect with other components to achieve the battery's power output and mechanical fixation. It is mainly silver powder, and alloy powders such as silver-coated copper powder are also used. It is the functional phase in the paste and plays the role of conductivity and current collection. By selecting suitable raw materials such as conductive metal powder, glass oxide, organic carrier, and performing pretreatment, such as screening and grading of silver powder, grinding and refining of glass powder, etc., to meet the performance requirements of the paste, the pretreated raw materials are added to a mixing equipment such as a planetary mixer in a certain proportion, and are fully stirred and mixed to evenly disperse the components to form a silver paste mixture. Finally, the silver paste that meets the use standards is obtained through filtration.

[0003] In existing filtration processing equipment, silver paste is generally directly discharged for collection after multi-stage filtration treatment without a certain period of sedimentation treatment, resulting in some fine particles that cannot be filtered out being discharged, affecting the filtration effect. Summary of the Invention

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A multi-layer filtering device for processing silver paste on the back side of a crystalline silicon photovoltaic cell, comprising:

[0006] A tank body, a slurry inlet pipe is installed on the top of the tank body, a slurry outlet pipe is installed on the outside of the tank body, a support is fixedly installed on the bottom of the tank body, and a motor is fixedly installed at the center of the bottom of the tank body, and the output end of the motor passes through the tank body and extends into the interior thereof;

[0007] A screening mechanism is installed inside the tank body and is used to preliminarily remove large particles in the slurry;

[0008] A filtering mechanism, which is installed at the bottom of the screening mechanism and is used to perform a secondary filtering process on the slurry;

[0009] A conical cover is fixedly installed on the bottom of the inner wall of the tank body, and the outer diameter of the conical cover gradually increases from top to bottom, and the gap between the conical cover and the tank body gradually decreases from top to bottom. The outer side of the conical cover is evenly provided with through grooves, and the inner wall of the conical cover is fixedly installed with an inclined guide cover. The inclined guide cover cooperates with the conical cover, and in the process of guiding the slurry to filter, the slurry that has been filtered is blocked by the conical cover, so that it flows downward along the inner wall of the conical cover. In the process of flowing, the slurry is guided to the center position by the inclined guide cover, so that the slurry that has just been filtered is not filtered. The treated slurry is concentrated in the center, and the slurry after settling for a certain period of time is concentrated on the outside, so that the slurry overflows from the through slot and is discharged from the slurry discharge pipe as the liquid level gradually rises, ensuring that the slurry after filtration is precipitated after a certain period of time before being discharged and collected, avoiding the slurry being directly discharged, so that the particulate matter still existing in the slurry is discharged together, affecting the filtering effect. The inner diameter of the inclined guide cover gradually decreases from top to bottom, and the connection position of the inclined guide cover and the conical cover is located above the through slot, and a sponge disk is fixedly installed between the conical cover and the tank body.

[0010] The top of the guide plate is provided with a conical surface which is concave at the center position and the bottom is flat, and the bottom of the guide plate is tightly fitted with the top of the conical cover, the outer side of the guide plate is fixedly connected to the top of the tank inner wall, and the slurry outlet pipe is located between the sponge plate and the guide plate. The top of the guide plate is fixedly connected with an oblique ring plate, and the guide plate and the tank body are matched to form a certain material storage space at the top. The conical surface on the top of the guide plate cooperates with the oblique ring plate to block some large particles and perform preliminary impurity removal to avoid a large number of large particles from clogging the circular groove and affecting the slurry circulation. The oblique ring plate is evenly installed along the center position of the guide plate, and the top of the oblique ring plate is inclined outward. A circular groove is provided at the center position of the top of the guide plate, and a rotating groove is provided at the bottom of the guide plate. A screening drum is rotatably installed at the rotating groove of the guide plate, and sieve holes are evenly provided on the outer side of the screening drum.

[0011] Preferably, a transmission shaft is fixedly installed at the center position of the bottom of the screening drum, and the bottom end of the transmission shaft is fixedly connected to the output end of the motor. The inner wall of the screening drum is fixedly connected to an inner retaining ring, which cooperates with the screening drum through the inner retaining ring. In the process of the slurry flowing from top to bottom, it is guided by the inner retaining ring, so that large particles enter the storage tray for collection. At the same time, the inner retaining ring prevents large particles from impacting the screening drum during rotation, causing damage to the screening drum and affecting the filtering effect. The inner retaining ring is evenly installed on the inner wall of the screening drum from top to bottom, and the inner retaining ring is located between the sieve holes. The inner retaining ring is inclined downward at one end away from the screening drum, and a storage tray is fixedly installed at the center position of the bottom of the inner wall of the screening drum, and rectangular grooves are evenly opened on the outer side of the storage tray.

[0012] The top of the sealing gasket fits tightly with the bottom of the screening drum, thereby blocking the flow of slurry from the inside of the arc groove drum and the tank body, thereby preventing the slurry from being discharged from the gap between the screening drum and the arc groove drum and entering the tank body, affecting the filtering effect of the slurry and preventing the slurry from being filtered by the filter bag from being discharged from the arc groove drum, and preventing the slurry from being discharged from the arc groove drum without filtering the slurry bag. The bottom of the inner wall of the arc groove drum is fixedly installed with an inner groove ring, the top of the inner groove ring is provided with an annular groove, and a grille drum is rotatably installed at the annular groove of the inner groove ring, the outer side of the grille drum is evenly provided with grille grooves, and the grille drum is located between the arc groove drum and the screening drum, and the bottom of the inner wall of the grille drum is fixedly installed with a connecting groove ring.

[0013] Preferably, the inner wall of the connecting groove ring is fixedly connected to the bottom of the inner wall of the screening drum, and the inner wall of the grille drum is fixedly connected with a stirring plate and a baffle plate, the stirring plate and the baffle plate correspond to the grille slot one by one, and the stirring plate and the baffle plate are symmetrically installed along the center position of the grille slot, and the slurry is stirred by the stirring plate during the rotation through the cooperation of the stirring plate and the baffle plate. At the same time, the cooperation of the baffle plate and the stirring plate is utilized to block larger particles through the gap between the baffle plate and the stirring plate, so that they are concentrated inside the grille drum, and the impurities are re-classified to avoid larger particles from contacting the filter bag, causing damage to the filter bag and affecting the normal filtration work. The stirring plate is away from the grille drum and one end is inclined toward the side of the baffle plate, and the end of the baffle plate is away from the grille drum and is inclined toward the side of the stirring plate, and the baffle plate is located on the inner side of the stirring plate and there is a gap between them.

[0014] The present invention provides a multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells. It has the following beneficial effects:

[0015] 1. The multi-layer filtering equipment for processing silver paste on the back of the crystalline silicon photovoltaic cell cooperates with the conical cover through the inclined guide cover. In the process of guiding the filtered slurry, the conical cover blocks the filtered slurry and makes it flow downward along the inner wall of the conical cover. In the process of flowing, the slurry is guided to the center by the inclined guide cover, so that the slurry that has just completed the filtering treatment is concentrated in the center, and the slurry that has settled after a certain period of time is concentrated on the outside, so that the slurry overflows from the through groove and is discharged from the slurry discharge pipe in the process of gradually rising liquid level, ensuring that the slurry after filtering is collected after settling for a certain period of time, avoiding the slurry being discharged directly, so that the particulate matter still existing in the slurry is discharged together, affecting the filtering effect.

[0016] 2. The multi-layer filtration equipment used for processing silver paste on the back of crystalline silicon photovoltaic cells forms a certain material storage space at the top through the coordination of the guide plate and the oblique ring plate, and the guide plate and the tank body. At the same time, the conical surface on the top of the guide plate cooperates with the oblique ring plate to block some large particles and perform preliminary impurity removal to prevent a large number of large particles from clogging the circular groove and affecting the flow of the slurry.

[0017] 3. The multi-layer filtering equipment used for processing silver paste on the back of crystalline silicon photovoltaic cells cooperates with the screen barrel through the inner baffle ring. When the slurry flows from top to bottom, it is guided by the inner baffle ring, so that large particles enter the storage tray for collection. At the same time, the inner baffle ring prevents large particles from impacting the screen barrel during rotation, causing damage to the screen barrel and affecting the filtering effect.

[0018] 4. The multi-layer filtering equipment used for processing silver paste on the back of crystalline silicon photovoltaic cells has a close fit between the top of the sealing gasket ring and the bottom of the screen drum. During the rotation, the flow between the inside of the arc groove drum and the tank body is blocked, preventing the slurry from being discharged from the gap between the screen drum and the arc groove drum and entering the tank body, affecting the filtering effect of the slurry, and preventing the slurry that has not been filtered by the filter bag from being discharged from the arc groove drum.

[0019] 5. The multi-layer filtering equipment used for processing silver paste on the back of crystalline silicon photovoltaic cells, through the cooperation of the stirring plate and the baffle plate, stirs the slurry during the rotation process, and at the same time utilizes the cooperation of the baffle plate and the stirring plate to block larger particles through the gap between the baffle plate and the stirring plate, so that they are concentrated inside the grid tube, and the impurities are re-classified to prevent larger particles from contacting the filter bag, causing damage to the filter bag and affecting the normal filtration work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a multi-layer filtering device for processing silver paste on the back side of a crystalline silicon photovoltaic cell according to the present invention;

[0021] Figure 2 This is a structural dissection diagram of a multi-layer filtering device for processing silver paste on the back side of a crystalline silicon photovoltaic cell according to the present invention;

[0022] Figure 3 This is a partial structural dissection diagram of a multi-layer filtering device for processing silver paste on the back side of a crystalline silicon photovoltaic cell according to the present invention;

[0023] Figure 4 It is a structural schematic diagram of the filtering mechanism of the present invention;

[0024] Figure 5 It is a structural dissection diagram of the filtering mechanism of the present invention;

[0025] Figure 6 It is a bottom view of the structure of the filter mechanism of the present invention;

[0026] Figure 7 A top view of the structure of the filter mechanism of the present invention is shown;

[0027] Figure 8 Schematic diagram of the structure of the screening mechanism of the present invention;

[0028] Figure 9 It is a structural dissection diagram of the screening mechanism of the present invention.

[0029] In the figure: 1. Tank body; 2. Screening mechanism; 3. Filtering mechanism; 4. Motor; 5. Support; 6. Slurry outlet pipe; 7. Slurry inlet pipe; 8. Conical cover; 9. Inclined guide cover; 10. Sponge plate; 21. Guide plate; 22. Screening barrel; 23. Drive shaft; 24. Inclined ring plate; 25. Inner retaining ring; 26. Storage tray; 31. Arc groove barrel; 32. Filter slurry bag; 33. Inner groove ring; 34. Grille barrel; 35. Connecting groove ring; 36. Sealing gasket ring; 37. Stirring plate; 38. Retaining plate. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] The first embodiment, as Figures 1 to 3 As shown, the present invention provides a technical solution:

[0032] A multi-layer filtering device for processing silver paste on the back side of a crystalline silicon photovoltaic cell, comprising:

[0033] The tank body 1 has a slurry inlet pipe 7 installed on the top of the tank body 1, and a slurry outlet pipe 6 installed on the outside of the tank body 1. A support 5 is fixedly installed on the bottom of the tank body 1, and a motor 4 is fixedly installed at the center of the bottom of the tank body 1. The output end of the motor 4 passes through the tank body 1 and extends into the interior thereof;

[0034] The screening mechanism 2 is installed inside the tank body 1 and is used to preliminarily remove large particles in the slurry;

[0035] The filtering mechanism 3 is installed at the bottom of the screening mechanism 2, and the filtering mechanism 3 is used to perform a secondary filtering treatment on the slurry;

[0036] A conical cover 8 is fixedly installed at the bottom of the inner wall of the tank body 1. The outer diameter of the conical cover 8 gradually increases from top to bottom, and the gap between the conical cover 8 and the tank body 1 gradually decreases from top to bottom. The outer side of the conical cover 8 is evenly provided with through grooves. After the sieving mechanism 2 and the filtering mechanism 3 are filtered, the slurry that has completed the filtering treatment is guided by the filtering mechanism 3 into the space between the conical cover 8 and the filtering mechanism 3. The slurry flows downward along the inner wall of the conical cover 8 through the guidance of the conical cover 8, and the inner wall of the conical cover 8 is fixedly installed. There is an inclined guide cover 9, the inner diameter of which gradually decreases from top to bottom, and the connection position of the inclined guide cover 9 and the conical cover 8 is located above the through groove. During the flow process, it cooperates with the inclined guide cover 9 to concentrate the slurry that has just been filtered at the center position and accumulate inside the tank body 1. During the accumulation process, the slurry on the outside overflows from the through groove of the conical cover 8, and the liquid level gradually rises during the accumulation process. After passing through the sponge plate 10, it is discharged from the slurry outlet pipe 6. A sponge plate 10 is fixedly installed between the conical cover 8 and the tank body 1.

[0037] The second embodiment, based on the first embodiment, see Figures 8 and 9 As shown, the screening mechanism 2 includes a guide plate 21, the top of the guide plate 21 is a conical surface with a concave center position and a flat bottom, and the bottom of the guide plate 21 is tightly fitted with the top of the conical cover 8, the outer side of the guide plate 21 is fixedly connected to the top of the inner wall of the tank body 1, the slurry outlet pipe 6 is located between the sponge plate 10 and the guide plate 21, and the top of the guide plate 21 is fixedly connected with an oblique ring plate 24. In the screening mechanism 2, after the slurry is introduced by the slurry inlet pipe 7, the slurry enters the top of the guide plate 21, and the slurry is directed to the circular While the groove position is guiding, some large particles are blocked by the oblique ring plate 24, and then the slurry is introduced into the screen drum 22 through the circular groove, and the drive shaft 23 is driven to rotate by the output end of the motor 4, so that the drive shaft 23 drives the screen drum 22 to rotate, and the oblique ring plates 24 are evenly installed along the center position of the guide plate 21, and the top of the oblique ring plates 24 is inclined to the outside, a circular groove is provided at the center position of the top of the guide plate 21, and a rotating groove is provided at the bottom of the guide plate 21, and the screen drum 22 is rotatably installed at the rotating groove of the guide plate 21, and sieve holes are evenly provided on the outside of the screen drum 22.

[0038] A transmission shaft 23 is fixedly installed at the center position of the bottom of the screening drum 22. The bottom end of the transmission shaft 23 is fixedly connected to the output end of the motor 4. An inner retaining ring 25 is fixedly connected to the inner wall of the screening drum 22. The inner retaining ring 25 is evenly installed on the inner wall of the screening drum 22 from top to bottom, and the inner retaining ring 25 is located between the sieve holes. The end of the inner retaining ring 25 away from the screening drum 22 is inclined downward. During the rotation process, the slurry is thrown out from the sieve hole position. At the same time, during the throwing process, the inner retaining ring 25 and the storage The material tray 26 cooperates with the inner retaining ring 25 and utilizes the characteristic of being inclined downward away from one end of the screening barrel 22 to guide the large particles and guide them into the storage tray 26, so that most of the large particles enter the storage tray 26 for collection. At the same time, the inner retaining ring 25 blocks the large particles to prevent them from impacting the screening barrel 22 during rotation, and a storage tray 26 is fixedly installed at the center position of the bottom of the inner wall of the screening barrel 22, and rectangular grooves are evenly opened on the outside of the storage tray 26.

[0039] The third embodiment, based on the first and second embodiments, see Figures 4 to 7 As shown, the filtering mechanism 3 includes an arc groove cylinder 31, which is fixedly mounted on the bottom of the guide plate 21, and the outer side of the arc groove cylinder 31 is evenly provided with arc grooves, a filter bag 32 is fixedly mounted on the outer side of the arc groove cylinder 31, a sealing gasket ring 36 is fixedly mounted on the inner wall of the arc groove cylinder 31, and the top of the sealing gasket ring 36 is tightly fitted with the bottom of the screening cylinder 22, an inner groove ring 33 is fixedly mounted on the bottom of the inner wall of the arc groove cylinder 31, and an annular groove is opened on the top of the inner groove ring 33, and a grille cylinder 34 is rotatably mounted on the annular groove of the inner groove ring 33, and grille grooves are evenly opened on the outer side of the grille cylinder 34. In the process, after the slurry with large particles removed is discharged from the screen drum 22, it first enters the interior of the grille drum 34, and the screen drum 22 and the grille drum 34 are connected by the connecting groove ring 35, so that the grille drum 34 is driven by the screen drum 22 to rotate when working. During the rotation, the slurry inside the grille drum 34 is driven by the stirring plate 37 and cooperates with the baffle plate 38 to block the larger particles in the existing slurry by the stirring plate 37 and the baffle plate 38. The grille drum 34 is located between the arc groove drum 31 and the screen drum 22, and a connecting groove ring 35 is fixedly installed on the bottom of the inner wall of the grille drum 34.

[0040] The inner wall of the connecting groove ring 35 is fixedly connected to the bottom of the inner wall of the screen drum 22, and the inner wall of the grille drum 34 is fixedly connected with a stirring plate 37 and a baffle plate 38. The stirring plate 37 and the baffle plate 38 correspond to the grille groove one by one, and the stirring plate 37 and the baffle plate 38 are symmetrically installed along the center position of the grille groove. The stirring plate 37 is away from the grille drum 34 and tilted toward the side of the baffle plate 38 at one end. Smaller particles are discharged from the gap between the stirring plate 37 and the baffle plate 38 along with the slurry, and are discharged from the grille groove of the grille drum 34, and enter the gap between the arc groove drum 31 and the grille drum 34. The arc groove drum 31 cooperates with the filter bag 32 to filter out the particles in the slurry. The end of the baffle plate 38 away from the grille drum 34 is tilted toward the side of the stirring plate 37, and the baffle plate 38 is located on the inner side of the stirring plate 37 and there is a gap between them.

[0041] During use, workers introduce the silver paste that needs to be filtered into the equipment through the slurry inlet pipe 7, and start the motor 4, so that the motor 4 drives the screening mechanism 2 and the filtering mechanism 3 to operate. After the slurry is introduced into the tank body 1, the tank body 1 cooperates with the screening mechanism 2 to make the slurry first enter the screening mechanism 2, and the slurry is preliminarily filtered by the screening mechanism 2. After removing the large particles in the slurry, it enters the filtering mechanism 3 and undergoes secondary filtering. Finally, the slurry overflows from the tank body 1 and is discharged from the slurry outlet pipe 6.

[0042] In the screening mechanism 2, after the slurry is introduced by the slurry inlet pipe 7, the slurry enters the top of the guide plate 21, and the conical surface on the top of the guide plate 21 cooperates with the inclined ring plate 24 to guide the slurry to the circular groove position. At the same time, some large particles are blocked by the inclined ring plate 24. Then the slurry is introduced into the screening drum 22 from the circular groove, and the transmission shaft 23 is driven to rotate by the output end of the motor 4, so that the transmission shaft 23 drives the screening drum 22 to rotate. During the rotation, the slurry is thrown out from the sieve hole position. At the same time, during the throwing-out process, the inner stop ring 25 cooperates with the storage tray 26, and the inner stop ring 25 is inclined downward away from the end of the screening drum 22 to guide the large particles and send them to the storage tray 26, so that most of the large particles enter the storage tray 26 for collection. At the same time, the inner stop ring 25 blocks the large particles to prevent them from impacting the screening drum 22 during the rotation.

[0043] In the filtering mechanism 3, after the slurry with large particles is discharged from the screen drum 22, it first enters the interior of the grille drum 34, and the screen drum 22 and the grille drum 34 are connected by the connecting groove ring 35, so that the grille drum 34 is driven by the screen drum 22 to rotate when working. During the rotation, the slurry inside the grille drum 34 is driven by the stirring plate 37 and cooperates with the baffle plate 38, so that the larger particles in the existing slurry are blocked by the stirring plate 37 and the baffle plate 38, so that the smaller particles are discharged from the gap between the stirring plate 37 and the baffle plate 38 along with the slurry, and are discharged from the grille groove of the grille drum 34, enter the gap between the arc groove drum 31 and the grille drum 34, and cooperate with the filter slurry bag 32 through the arc groove drum 31 to filter out the particles in the slurry.

[0044] After being filtered by the screening mechanism 2 and the filtering mechanism 3, the slurry that has completed the filtering process is guided by the filtering mechanism 3 into between the conical cover 8 and the filtering mechanism 3. Guided by the conical cover 8, the slurry flows downward along the inner wall of the conical cover 8, and cooperates with the inclined guide cover 9 during the flow process, so that the slurry that has just completed the filtration is concentrated in the center position and accumulated inside the tank body 1. During the accumulation process, the slurry on the outside overflows from the through groove of the conical cover 8, and the liquid level gradually rises during the accumulation process. After passing through the sponge plate 10, it is discharged from the slurry outlet pipe 6.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells, characterized in that: include: A tank body (1), a slurry inlet pipe (7) is installed on the top of the tank body (1), and a slurry outlet pipe (6) is installed on the outside of the tank body (1), a support (5) is fixedly installed on the bottom of the tank body (1), and a motor (4) is fixedly installed at the center position of the bottom of the tank body (1), and the output end of the motor (4) passes through the tank body (1) and extends into the interior thereof; A screening mechanism (2), the screening mechanism (2) being installed inside the tank body (1), and the screening mechanism (2) being used for preliminarily removing large particles of material in the slurry; A filtering mechanism (3), the filtering mechanism (3) being installed at the bottom of the screening mechanism (2), and the filtering mechanism (3) being used for performing a secondary filtering treatment on the slurry; A conical cover (8) is fixedly mounted on the bottom of the inner wall of the tank body (1), the outer diameter of the conical cover (8) gradually increases from top to bottom, and the gap between the conical cover (8) and the tank body (1) gradually decreases from top to bottom, the outer side of the conical cover (8) is evenly provided with through grooves, and an inclined guide cover (9) is fixedly mounted on the inner wall of the conical cover (8), the inner diameter of the inclined guide cover (9) gradually decreases from top to bottom, and the connection position between the inclined guide cover (9) and the conical cover (8) is located above the through groove, and a sponge plate (10) is fixedly mounted between the conical cover (8) and the tank body (1).

2. The multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells according to claim 1, characterized in that: The screening mechanism (2) comprises a guide plate (21), the top of the guide plate (21) being a conical surface with a recessed center and the bottom being a flat surface, the bottom of the guide plate (21) being tightly fitted with the top of the conical cover (8), and the outer side of the guide plate (21) being fixedly connected to the top of the inner wall of the tank body (1).

3. The multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells according to claim 2, characterized in that: The slurry outlet pipe (6) is located between the sponge plate (10) and the guide plate (21); the top of the guide plate (21) is fixedly connected with an inclined ring plate (24); the inclined ring plates (24) are evenly installed along the center of the guide plate (21), and the top end of the inclined ring plates (24) is inclined outward.

4. The multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells according to claim 3, characterized in that: A circular groove is provided at the center of the top of the guide plate (21), and a rotation groove is provided at the bottom of the guide plate (21). A screening drum (22) is rotatably mounted at the rotation groove of the guide plate (21), and screening holes are evenly provided on the outside of the screening drum (22).

5. The multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells according to claim 4, characterized in that: A transmission shaft (23) is fixedly mounted at the center of the bottom of the screening barrel (22), the bottom end of the transmission shaft (23) is fixedly connected to the output end of the motor (4), and an inner retaining ring (25) is fixedly connected to the inner wall of the screening barrel (22).

6. The multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells according to claim 5, characterized in that: The inner retaining ring (25) is evenly installed on the inner wall of the sieve barrel (22) from top to bottom, and the inner retaining ring (25) is located between the sieve holes. The end of the inner retaining ring (25) away from the sieve barrel (22) is inclined downward, and a storage tray (26) is fixedly installed at the center of the bottom of the inner wall of the sieve barrel (22), and rectangular grooves are evenly opened on the outer side of the storage tray (26).

7. The multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells according to claim 6, characterized in that: The filtering mechanism (3) comprises an arc groove cylinder (31), the arc groove cylinder (31) is fixedly mounted on the bottom of the guide plate (21), and arc grooves are evenly formed on the outside of the arc groove cylinder (31), and a filter pulp bag (32) is fixedly mounted on the outside of the arc groove cylinder (31).

8. The multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells according to claim 7, characterized in that: A sealing ring (36) is fixedly mounted on the inner wall of the arc groove cylinder (31), and the top of the sealing ring (36) is tightly fitted with the bottom of the screening cylinder (22). An inner groove ring (33) is fixedly mounted on the bottom of the inner wall of the arc groove cylinder (31), and a ring groove is formed on the top of the inner groove ring (33).

9. The multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells according to claim 8, characterized in that: A grille cylinder (34) is rotatably mounted on the annular groove of the inner groove ring (33), grille grooves are evenly formed on the outside of the grille cylinder (34), and the grille cylinder (34) is located between the arc groove cylinder (31) and the screening cylinder (22), and a connecting groove ring (35) is fixedly mounted on the bottom of the inner wall of the grille cylinder (34).

10. The multi-layer filtering device for processing silver paste on the back side of crystalline silicon photovoltaic cells according to claim 9, characterized in that: The inner wall of the connecting groove ring (35) is fixedly connected to the bottom of the inner wall of the screening drum (22), and the inner wall of the grille drum (34) is fixedly connected with a stirring plate (37) and a baffle plate (38), the stirring plate (37) and the baffle plate (38) corresponding to the grille groove one by one, and the stirring plate (37) and the baffle plate (38) are symmetrically installed along the center position of the grille groove, the stirring plate (37) is away from the grille drum (34) and one end is inclined toward the baffle plate (38), and the baffle plate (38) is away from the grille drum (34) and one end is inclined toward the stirring plate (37), and the baffle plate (38) is located on the inner side of the stirring plate (37) and there is a gap between them.

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