Automatic cleaning method for solder paste printing machine steel mesh

Abstract

The invention discloses an automatic cleaning method for a solder paste printing machine steel mesh, and belongs to the technical field of surface mounting process.The automatic cleaning method comprises the steps that firstly, the steel mesh is placed in a closed environment, and a circulating spraying mechanism is used for spraying and infiltrating the surface of the steel mesh; performing ultrasonic cleaning on the surface of the steel mesh by using an ultrasonic cleaning bin body; then, a steel mesh lifting action mechanism is used for lifting the steel mesh subjected to cleaning agent spraying and ultrasonic cleaning, so that the surface of the steel mesh is completely exposed out of the ultrasonic cleaning bin body; and meanwhile, the surface of the steel mesh is subjected to air-blowing cleaning alternately through the first air-blowing lifting action mechanism and the second air-blowing lifting action mechanism. And after the surface of the steel mesh is cleaned, the surface of the steel mesh is dried by the drying mechanism. Sundries such as solder paste remaining on the surface of the steel mesh can be thoroughly cleaned, so that the cleanliness of the surface of the cleaned steel mesh is guaranteed, and the cleaning efficiency of the steel mesh is improved.

Description

Technical Field

[0001] The invention relates to the technical field of surface mounting technology, and in particular to an automatic cleaning method for a steel mesh of a solder paste printer. Background Art

[0002] The solder paste printer is the front-end equipment in the whole line of SMT, i.e. surface mount technology, and is also one of the three major mainstream parts in the SMT industry; the other two major parts are placement machines or reflow soldering. The solder paste printer is mainly used to print solder paste or red glue on the corresponding pads through the steel mesh to facilitate the subsequent automatic placement process. The solder paste printer is divided into two types: semi-automatic and fully automatic. At present, most mainstream factories use fully automatic solder paste printers because the overall technology of the solder paste printer industry has developed relatively maturely.

[0003] The working principle of the solder paste printer is relatively simple and clear: first, fix the circuit board to be printed on the printing positioning table; then, the left and right scrapers or printing heads of the printer print the solder paste or red glue through the steel mesh on the corresponding pads; finally, the PCB with uniform printing is input into the placement machine through the transmission table for automatic placement.

[0004] The steel mesh cleaning machine is an instrument used to clean the steel mesh. It is mainly used to clean the SMT steel mesh to ensure its cleanliness to meet the subsequent production needs. The steel mesh cleaning machine mainly uses specific cleaning methods, such as spray cleaning, high-pressure air jet, etc.; combined with a cleaning agent, it can perform a full-scale cleaning of the steel mesh. During the cleaning process, the cleaning agent reacts with the dirt on the steel mesh, dissolving or peeling it off, and rinses it clean by spraying the cleaning liquid and high-pressure air jet.

[0005] Based on this, Chinese patent CN210172151U discloses a steel mesh cleaning table, which includes: four columns and a cleaning area supported by the columns; a first placement area, which is arranged below the cleaning area; a second placement area is arranged on the first column and the second column; and a third placement area is arranged on the third column and the fourth column. In the technical solution disclosed in the patent, by setting the first placement area, it is convenient to store the steel mesh to be cleaned, and by setting the second placement area and the third placement area, it is convenient to place the detergent, towel, trash can and other items needed in the cleaning process, so that the staff can directly take them without going to a distant place to get them, which can save time and improve work efficiency.

[0006] However, the above-disclosed steel mesh cleaning station still has the technical problem of insufficient cleanliness of the steel mesh after cleaning. Specifically, the above-disclosed steel mesh cleaning station mainly sets a first placement area to facilitate the storage of the steel mesh to be cleaned, and sets the second placement area and the third placement area to facilitate the placement of detergents, towels, trash cans and other items needed in the cleaning process, so that the staff can directly take them without going to a distant place. However, the solution disclosed in the patent cannot improve the cleaning function of the steel mesh. Specifically, the solder paste printing process, as one of the important processes of the SMT production line, directly determines the quality and reliability of the printed circuit board to a large extent, and has received extensive attention from domestic and foreign academic circles. As the printing process proceeds, the solder paste will gradually remain around the opening of the steel mesh, resulting in degradation of the performance of the printing process and the production of defective printed products. As an effective way to remove solder paste residue, steel mesh cleaning can greatly improve the performance of the printing process, ensure the quality of printed products, and reduce the cost loss of additional inspections and reworks caused by printing defects. However, ineffective cleaning operations will also lead to wear of the cleaning mechanism, waste of cleaning agents, and a large amount of labor costs, thereby increasing the total cost of the production process. Therefore, reasonable scheduling of steel mesh cleaning operations can ensure the quality of printing process products and reduce the cost of the production process. Summary of the invention

[0007] Based on this, it is necessary to provide a method for automatically cleaning the steel mesh of a solder paste printer in order to improve the technical problem of how to improve the cleaning efficiency of the steel mesh.

[0008] A method for automatically cleaning a steel mesh of a solder paste printer, comprising the following steps: S1: First open the closed box structure, and then clamp the steel mesh to be cleaned in the steel mesh lifting mechanism; S2: After the steel mesh lifting mechanism sends the steel mesh to be cleaned into the ultrasonic cleaning chamber, the circulating spraying mechanism evenly sprays the solvent and the cleaning agent pre-stored in the cleaning agent storage chamber onto the surface of the steel mesh sent into the ultrasonic cleaning chamber; S3: The ultrasonic cleaning chamber uses ultrasonic waves to clean the surface of the steel mesh, and at the same time, the circulating spray mechanism continuously sprays the solvent on the surface of the steel mesh; S4: The steel mesh lifting mechanism drives the steel mesh to rise from the ultrasonic cleaning chamber to be exposed; S5: First, the first wind scraper lifting mechanism sprays airflow from bottom to top to clean the surface of one side of the steel mesh, and then the second wind scraper lifting mechanism sprays airflow from bottom to top to clean the surface of the other side of the steel mesh; S6: the first wind scraper lifting mechanism is caused to spray airflow again from top to bottom to clean one side of the steel mesh surface by wind scraping, and the second wind scraper lifting mechanism is caused to spray airflow from top to bottom to clean the other side of the steel mesh surface by wind scraping; S7: The steel mesh lifting mechanism sends the steel mesh into the ultrasonic cleaning chamber again, and continues to repeat steps S to S until the cleanliness of the steel mesh surface meets the preset requirements; S8: After the steel mesh lifting mechanism maintains the steel mesh at the preset highest position, the drying mechanism starts and dries the surface of the steel mesh. After that, the user can open the closed box structure and take away the cleaned steel mesh.

[0009] Specifically, the method of cleaning the steel mesh using an ultrasonic cleaning chamber includes the following steps: S11: The steel mesh lifting mechanism sinks the steel mesh to be cleaned into the accommodating cavity of the ultrasonic cleaning chamber; S12: The circulating spray mechanism sprays the solvent and the cleaning agent used for washing evenly on the surface of the steel mesh, and at the same time, the solvent in the accommodating cavity can cover the surface to be cleaned of the steel mesh; S13: A plurality of ultrasonic working units evenly distributed between the shell structure and the accommodating cavity are started simultaneously, and emit ultrasonic waves to both sides of the steel mesh, so that the debris on both sides of the steel mesh is softened, loosened or dissolved in the solvent under the action of ultrasonic waves; S14: The steel mesh lifting mechanism lifts the steel mesh that has completed one ultrasonic cleaning cycle to a position completely out of the accommodating cavity; S15: After completing one ultrasonic cleaning cycle, the solvent is discharged from the waste discharge unit to the outside of the accommodating cavity.

[0010] Specifically, the method of using a circulating spray mechanism to spray and wet the surface of the steel mesh to be cleaned includes the following steps: S21: A circulation pump is connected to the circulation support seat provided in the closed box structure, and the circulation pump is connected to the low-zone circulation pipeline and the high-zone circulation pipeline respectively, and the low-zone circulation pipeline is connected to the lower part of the ultrasonic cleaning chamber body, and the high-zone circulation pipeline is connected to the upper part of the ultrasonic cleaning chamber body; at the same time, the detergent storage chamber body is connected between the high-zone circulation pipeline and the ultrasonic cleaning chamber body; S22: The circulation pump sprays the detergent in the detergent storage bin through the high zone circulation pipeline from the high position of the steel mesh in the ultrasonic cleaning bin; S23: The circulation pump draws the cleaning agent and solvent from the lower part of the ultrasonic cleaning chamber through the low-zone circulation pipeline, and then sprays them down from the high position of the steel mesh in the ultrasonic cleaning chamber through the high-zone circulation pipeline to form a spray circulation loop.

[0011] Specifically, the method of using the steel mesh lifting mechanism to drive the steel mesh to be cleaned includes the following steps: S31: After the closed box structure is opened, the steel mesh to be cleaned is clamped and limited by the steel mesh clamp provided in the steel mesh lifting mechanism, and then the closed box structure is closed again; S32: The two steel mesh lifting driving cylinders provided in the steel mesh lifting mechanism simultaneously drive the two lifting telescopic rods to descend and retract, so that the two lifting telescopic rods simultaneously pull the steel mesh clamp and the clamped steel mesh at both ends of the steel mesh clamp to descend into the accommodating cavity; S33: After completing a single spray and ultrasonic cleaning, the two steel mesh lifting drive cylinders simultaneously drive the two steel mesh lifting telescopic rods to rise simultaneously to respectively support the two ends of the steel mesh clamp, thereby pulling up the steel mesh clamp and the clamped steel mesh to leave the accommodating range of the accommodating cavity.

[0012] Specifically, the method for cleaning the steel mesh using the first wind scraper lifting mechanism and the second wind scraper lifting mechanism includes the following steps: S41: After the steel mesh lifting mechanism supports the steel mesh that has been sprayed and ultrasonically cleaned above the ultrasonic cleaning chamber, the wind scraping nozzle structure provided by the first wind scraping lifting mechanism is driven by two supporting telescopic rods to spray and scrape upward from the bottom of the clamped steel mesh along the top thereof, so that the debris adhered to one side of the steel mesh is cleaned by the airflow; S42: After the wind scraper nozzle structure of the first wind scraper lifting mechanism is raised to the upper limit position, the wind scraper nozzle structure of the second wind scraper lifting mechanism is also driven by the two supporting telescopic rods to scrape upward from the bottom of the clamped steel mesh along the top thereof, so that the debris adhered to the other side of the steel mesh is cleaned by the airflow; S43: The two wind scraping nozzle structures provided in the first wind scraping lifting action mechanism and the second wind scraping lifting action mechanism move alternately from the upper limit position from top to bottom, and respectively spray and scrape the two sides of the steel mesh; until the two wind scraping nozzle structures reach the lower limit position, the single spraying and scraping treatment is completed, and the steel mesh lifting action mechanism returns the steel mesh that has completed the spraying and scraping cleaning to the ultrasonic cleaning chamber, or suspends the steel mesh above the ultrasonic cleaning chamber to wait for the drying process.

[0013] Specifically, the method of drying the steel mesh using the drying mechanism includes the following steps: S51: The steel mesh lifting mechanism suspends the cleaned steel mesh above the ultrasonic cleaning chamber; S52: The heating structure provided in the drying mechanism generates heat at the lower part of the air guide cover after being energized; S53: The air blowing mechanism generates airflow and blows the heat gathered at the lower part of the air guide cover to the periphery of the steel mesh, so that the steel mesh is dried.

[0014] In summary, the present invention provides a method for automatically cleaning a stencil of a solder paste printer, and proposes a device for automatically cleaning a stencil of a solder paste printer, which comprises: a closed box structure, an ultrasonic cleaning bin, a circulating spraying mechanism, a detergent storage bin, a stencil lifting mechanism, a first wind scraper lifting mechanism, a second wind scraper lifting mechanism, and a drying mechanism; the ultrasonic cleaning bin is arranged in the closed box structure, the circulating spraying mechanism is adjacent to the ultrasonic cleaning bin and is arranged in the closed box structure, the circulating spraying mechanism is connected to the ultrasonic cleaning bin, and the detergent storage bin is The storage bin is arranged between the ultrasonic cleaning bin and the circulating spray mechanism, and the detergent storage bin is respectively connected to the ultrasonic cleaning bin and the circulating spray mechanism; the steel mesh lifting mechanism is arranged across both sides of the ultrasonic cleaning bin, and the steel mesh lifting mechanism movably connects the steel mesh to be cleaned in the ultrasonic cleaning bin; the first wind scraper lifting mechanism and the second wind scraper lifting mechanism are respectively arranged on the two side surfaces of the ultrasonic cleaning bin, and the drying mechanism is arranged on the top of the closed box structure above the ultrasonic cleaning bin.

[0015] In addition, the present invention also proposes a solution for deep cleaning the surface of the steel mesh after the steel mesh is removed from the solder paste printer. The solution first places the steel mesh in a closed environment and uses a circulating spray mechanism to spray and soak the surface of the steel mesh to facilitate the uniform application of the cleaning agent. Then, the surface of the steel mesh is ultrasonically cleaned by an ultrasonic cleaning chamber, so that the residual solder paste that adheres to the periphery of the steel mesh mesh and has been solidified gradually softens and falls off. Then, the steel mesh that has been sprayed with the cleaning agent and ultrasonically cleaned is lifted by a steel mesh lifting mechanism, so that the surface of the steel mesh is completely exposed outside the ultrasonic cleaning chamber. At the same time, the surface of the steel mesh is alternately cleaned by the first wind scraping lifting mechanism and the second wind scraping lifting mechanism, specifically: the surface of the steel mesh is sprayed and scraped by the strong airflow sprayed by the first wind scraping lifting mechanism or the second wind scraping lifting mechanism, so as to form the action principle of the scraper scraping back and forth, so that the surface of the steel mesh can be further cleaned. After the surface of the steel mesh is cleaned, the surface of the steel mesh is dried by a drying mechanism. It can be seen that the automatic cleaning method for a solder paste printer steel mesh of the present invention can thoroughly clean the solder paste and other debris remaining on the surface of the steel mesh to ensure the cleanliness of the steel mesh surface after cleaning, avoiding the subsequent manual repeated flushing and cleaning of the steel mesh, and improving the cleaning efficiency of the steel mesh. Therefore, the automatic cleaning method for a solder paste printer steel mesh of the present invention solves the technical problem of how to improve the cleaning efficiency of the steel mesh. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of a device used in a method for automatically cleaning a steel mesh of a solder paste printer according to the present invention; Figure 2 A schematic diagram of a partial structure of a device used in a method for automatically cleaning a steel mesh of a solder paste printer according to the present invention; Figure 3 It is a structural schematic diagram of a partial structure of another direction of a device used in a method for automatically cleaning a steel mesh of a solder paste printer according to the present invention; Figure 4 It is a schematic diagram of the exploded structure of the other direction of the partial structure of the device applied to the automatic cleaning method of the steel mesh of the solder paste printer of the present invention. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0019] 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 at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0023] Please also read Figures 1 to 4, an automatic cleaning device for a solder paste printer steel mesh, comprising: a closed box structure 1, an ultrasonic cleaning bin 2, a circulating spraying mechanism 3, a detergent storage bin 4, a steel mesh lifting mechanism 5, a first wind scraper lifting mechanism 6, a second wind scraper lifting mechanism 7 and a drying mechanism 8; the ultrasonic cleaning bin 2 is arranged in the closed box structure 1, the circulating spraying mechanism 3 is adjacent to the ultrasonic cleaning bin 2 and is arranged in the closed box structure 1, the circulating spraying mechanism 3 is connected to the ultrasonic cleaning bin 2, and the detergent storage bin 4 is arranged in the ultrasonic cleaning bin Between the bin body 2 and the circulating spray mechanism 3, the detergent storage bin body 4 is respectively connected to the ultrasonic cleaning bin body 2 and the circulating spray mechanism 3; the steel mesh lifting action mechanism 5 is arranged across both sides of the ultrasonic cleaning bin body 2, and the steel mesh lifting action mechanism 5 movably connects the steel mesh to be cleaned in the ultrasonic cleaning bin body 2; the first wind scraper lifting action mechanism 6 and the second wind scraper lifting action mechanism 7 are respectively arranged on the two side surfaces of the ultrasonic cleaning bin body 2, and the drying mechanism 8 is arranged on the top of the closed box structure 1 above the ultrasonic cleaning bin body 2.

[0024] Specifically, a method for applying the aforementioned solder paste printer steel mesh automatic cleaning device comprises the following steps: S1: first open the closed box structure 1, and then mount the steel mesh to be cleaned in the steel mesh lifting mechanism 5; S2: After the steel mesh lifting mechanism 5 sends the steel mesh to be cleaned into the ultrasonic cleaning chamber 2, the circulating spraying mechanism 3 evenly sprays the cleaning agent pre-stored in the solvent and cleaning agent storage chamber 4 onto the surface of the steel mesh sent into the ultrasonic cleaning chamber 2; S3: The ultrasonic cleaning chamber 2 uses ultrasonic waves to clean the surface of the steel mesh, and at the same time, the circulating spraying mechanism 3 continuously sprays the solvent on the surface of the steel mesh; S4: the steel mesh lifting mechanism 5 drives the steel mesh to rise from the ultrasonic cleaning chamber 2 to be exposed; S5: First, the first wind scraper lifting mechanism 6 sprays airflow from bottom to top to clean the surface of one side of the steel mesh, and then the second wind scraper lifting mechanism 7 sprays airflow from bottom to top to clean the surface of the other side of the steel mesh; S6: the first wind scraper lifting mechanism 6 is made to spray airflow again from top to bottom to clean one side surface of the steel mesh by wind scraping, and the second wind scraper lifting mechanism 7 is made to spray airflow from top to bottom to clean the other side surface of the steel mesh by wind scraping; S7: The steel mesh lifting mechanism 5 sends the steel mesh into the ultrasonic cleaning chamber 2 again, and continues to repeat steps S2 to S6 until the cleanliness of the steel mesh surface meets the preset requirements; S8: After the steel mesh lifting mechanism 5 maintains the steel mesh at the preset highest position, the drying mechanism 8 starts and dries the surface of the steel mesh. After that, the user can open the closed box structure 1 and take away the cleaned steel mesh.

[0025] Specifically, solder paste printing is one of the three main processes in surface mount production. Studies have shown that more than 60% of PCB assembly quality problems are rooted in the solder paste printing process. The steel mesh is an important factor affecting the quality of solder paste printing. The function of the steel mesh is to apply solder paste to the pad using the mesh. As the printing process is repeated, the residual solder paste will adhere more and more around the steel mesh and gradually solidify, thereby affecting the printing quality. At present, the market generally adopts a periodic steel mesh cleaning method to remove the residual solder paste on the steel mesh, but the cleaning mechanism built into the solder paste printer is generally ineffective and it is difficult to completely clean the solder paste on the surface of the steel mesh.

[0026] Based on this, the present invention proposes a method for automatically cleaning the steel mesh of a solder paste printer. A scheme is proposed for deeply cleaning the surface of the steel mesh separately after the steel mesh is removed from the solder paste printer. The method first places the steel mesh in a closed environment, and uses a circulating spray mechanism 3 to spray and soak the surface of the steel mesh to facilitate uniform application of the cleaning agent; then, the surface of the steel mesh is ultrasonically cleaned by an ultrasonic cleaning chamber 2, so that the residual solder paste that adheres to the periphery of the steel mesh mesh holes and has been solidified gradually softens and falls off; then, the steel mesh that has completed the cleaning agent spraying and ultrasonic cleaning is lifted by a steel mesh lifting mechanism 5, so that the surface of the steel mesh is completely exposed outside the ultrasonic cleaning chamber 2; at the same time, the surface of the steel mesh is alternately cleaned by wind scraping by the first wind scraping lifting mechanism 6 and the second wind scraping lifting mechanism 7, specifically: the surface of the steel mesh is sprayed and scraped by the strong airflow sprayed by the first wind scraping lifting mechanism 6 or the second wind scraping lifting mechanism 7, so as to form the action principle of the scraper scraping back and forth, so that the surface of the steel mesh can be further cleaned. After the surface of the steel mesh is cleaned, the surface of the steel mesh is dried by the drying mechanism 8. It can be seen that the automatic cleaning method of the steel mesh of the solder paste printer of the present invention can thoroughly clean the solder paste and other debris remaining on the surface of the steel mesh to ensure the cleanliness of the surface of the steel mesh after cleaning, avoid the subsequent manual repeated flushing and cleaning of the steel mesh, and improve the cleaning efficiency of the steel mesh.

[0027] Furthermore, the ultrasonic cleaning chamber 2 has a shell structure 201, a receiving cavity 202, a plurality of ultrasonic working units 203 and a waste discharge unit 204; the receiving cavity 202 is arranged in the shell structure 201, and the plurality of ultrasonic working units 203 are evenly distributed between the shell structure 201 and the receiving cavity 202; the waste discharge unit 204 is arranged at the lower part of the shell structure 201, and the waste discharge unit 204 is connected to the receiving cavity 202; the circulating spray mechanism 3 is connected to the receiving cavity 202.

[0028] Specifically, in a method for automatically cleaning a stencil of a solder paste printer according to the present invention, the method for cleaning the stencil using an ultrasonic cleaning chamber 2 comprises the following steps: S11: The steel mesh lifting mechanism 5 sinks the steel mesh to be cleaned into the accommodating cavity 202 of the ultrasonic cleaning chamber 2; S12: The circulating spray mechanism 3 sprays the solvent and the detergent used for washing evenly on the surface of the steel mesh, and at the same time, the solvent in the accommodating cavity 202 can cover the surface to be cleaned of the steel mesh; S13: A plurality of ultrasonic working units 203 evenly distributed between the shell structure 201 and the accommodating cavity 202 are simultaneously started and emit ultrasonic waves to both sides of the steel mesh, so that the debris on both sides of the steel mesh is softened, loosened or dissolved in the solvent under the action of ultrasonic waves; S14: The steel mesh lifting mechanism 5 lifts the steel mesh that has completed one ultrasonic cleaning cycle to a position completely out of the range of the accommodating cavity 202; S15: After completing one ultrasonic cleaning cycle, the solvent is discharged from the waste discharge unit 204 to the outside of the accommodating cavity 202 .

[0029] Furthermore, the circulating spray mechanism 3 has a circulating support seat 301, a circulating pump 302, a low zone circulating pipeline 303 and a high zone circulating pipeline 304; the circulating support seat 301 is arranged in the closed box structure 1, the circulating pump 302 is arranged on the circulating support seat 301, the low zone circulating pipeline 303 is connected to the lower part of the accommodating cavity 202, the high zone circulating pipeline 304 is connected to the upper part of the accommodating cavity 202, and the circulating pump 302 is respectively connected to the low zone circulating pipeline 303 and the high zone circulating pipeline 304.

[0030] Specifically, in the automatic cleaning method of a solder paste printer steel mesh of the present invention, the method of using the circulating spraying mechanism 3 to spray and wet the surface of the steel mesh to be cleaned includes the following steps: S21: A circulation pump 302 is connected to the circulation support seat 301 provided in the closed box structure 1, and the circulation pump 302 is connected to the low-zone circulation pipeline 303 and the high-zone circulation pipeline 304 respectively, and the low-zone circulation pipeline 303 is connected to the lower part of the ultrasonic cleaning chamber 2, and the high-zone circulation pipeline 304 is connected to the upper part of the ultrasonic cleaning chamber 2; at the same time, the detergent storage chamber 4 is connected between the high-zone circulation pipeline 304 and the ultrasonic cleaning chamber 2; S22: The circulation pump 302 sprays the detergent in the detergent storage chamber 4 through the high zone circulation pipeline 304 from the high position of the steel mesh in the ultrasonic cleaning chamber 2; S23: The circulation pump 302 draws the detergent and solvent from the lower part of the ultrasonic cleaning chamber 2 through the low-zone circulation pipeline 303, and then sprays them down from the high position of the steel mesh in the ultrasonic cleaning chamber 2 through the high-zone circulation pipeline 304 to form a spray circulation loop.

[0031] Furthermore, the steel mesh lifting mechanism 5 comprises a steel mesh clamp 501, a steel mesh lifting telescopic rod 502, a steel mesh lifting driving cylinder 503 and a steel mesh lifting cylinder seat 504; the steel mesh clamp 501 is movably arranged on the ultrasonic cleaning chamber body 2, and the two ends of the steel mesh clamp 501 are respectively connected to one of the steel mesh lifting telescopic rods 502, each of the steel mesh lifting telescopic rods 502 is correspondingly connected to one of the steel mesh lifting driving cylinders 503, and each of the steel mesh lifting driving cylinders 503 is correspondingly connected to one of the steel mesh lifting cylinder seats 504; the two steel mesh lifting cylinder seats 504 are respectively and relatively arranged on the two sides of the ultrasonic cleaning chamber body 2.

[0032] Specifically, in a method for automatically cleaning a stencil of a solder paste printer according to the present invention, a method for driving the stencil to be cleaned by using the stencil lifting mechanism 5 comprises the following steps: S31: After opening the closed box structure 1, the steel mesh clamp 501 provided in the steel mesh lifting mechanism 5 is used to hold and limit the steel mesh to be cleaned, and then the closed box structure 1 is closed again; S32: The two steel mesh lifting driving cylinders 503 of the steel mesh lifting mechanism 5 simultaneously drive the two lifting telescopic rods 502 to descend and retract, so that the two lifting telescopic rods 502 simultaneously pull the steel mesh clamp 501 and the clamped steel mesh at both ends of the steel mesh clamp 501 to descend into the accommodating cavity 202; S33: After completing a single spray and ultrasonic cleaning, the two steel mesh lifting drive cylinders 503 simultaneously drive the two steel mesh lifting telescopic rods 502 to rise at the same time to respectively support the two ends of the steel mesh clamp 501, thereby pulling up the steel mesh clamp 501 and the clamped steel mesh to leave the accommodating range of the accommodating cavity 202.

[0033] Further, the first wind scraper lifting mechanism 6 has a wind scraper nozzle structure 601, a wind scraper support telescopic rod 602, a wind scraper drive cylinder 603 and a wind scraper cylinder support seat 604; the wind scraper nozzle structure 601 is movably arranged on one side of the ultrasonic cleaning chamber 2, the two wind scraper support telescopic rods 602 are respectively connected to the two ends of the wind scraper nozzle structure 601, each wind scraper support telescopic rod 602 is correspondingly connected to a wind scraper drive cylinder 603; each wind scraper drive cylinder 603 is correspondingly arranged on a wind scraper cylinder support seat 604; the two wind scraper cylinder support seats 604 are adjacently arranged on the same side of the ultrasonic cleaning chamber 2. Specifically, the second wind scraper lifting mechanism 7 has the same or similar structure as the first wind scraper lifting mechanism 6, but the second wind scraper lifting mechanism 7 and the first wind scraper lifting mechanism 6 are respectively arranged on two opposite sides of the shell structure 201.

[0034] Specifically, in the automatic cleaning method of the stencil of a solder paste printer of the present invention, the method of cleaning the stencil by using the first wind scraper lifting mechanism 6 and the second wind scraper lifting mechanism 7 comprises the following steps: S41: After the steel mesh lifting mechanism 5 supports the steel mesh that has been sprayed and ultrasonically cleaned above the ultrasonic cleaning chamber 2, the wind scraping nozzle structure 601 provided by the first wind scraping lifting mechanism 6 is driven by the two supporting telescopic rods 602 to spray and scrape upward from the bottom of the clamped steel mesh along the top thereof, so that the debris adhered to one side of the steel mesh is cleaned by the airflow; S42: After the wind scraper nozzle structure 601 of the first wind scraper lifting mechanism 6 is raised to the upper limit position, the wind scraper nozzle structure 601 of the second wind scraper lifting mechanism 7 is also driven by the two supporting telescopic rods 602 to scrape upward from the bottom of the clamped steel mesh along the top thereof, so that the debris adhered to the other side of the steel mesh is cleaned by the airflow; S43: The two wind scraping nozzle structures 601 provided in the first wind scraping lifting mechanism 6 and the second wind scraping lifting mechanism 7 move alternately from the upper limit position from top to bottom to respectively spray and scrape the two sides of the steel mesh; until the two wind scraping nozzle structures 601 reach the lower limit position, the single spraying and scraping treatment is completed, and the steel mesh lifting mechanism 5 returns the steel mesh that has been sprayed and scraped cleaned to the ultrasonic cleaning chamber 2, or suspends the steel mesh above the ultrasonic cleaning chamber 2 to wait for the drying process.

[0035] Furthermore, the drying mechanism 8 has an air guide hood 801, an air blowing mechanism 802 and a heating structure 803; the air guide hood 801 is arranged above the ultrasonic cleaning chamber 2, and the air guide hood 801 is arranged on the top of the closed box structure 1; the air blowing mechanism 802 is arranged on the upper part of the air guide hood 801, and the heating structure 803 is arranged on the lower part of the air guide hood 801.

[0036] Specifically, in the automatic cleaning method of a solder paste printer steel mesh of the present invention, the method of drying the steel mesh by using the drying mechanism 8 comprises the following steps: S51: The steel mesh lifting mechanism 5 suspends the cleaned steel mesh above the ultrasonic cleaning chamber 2; S52: The heating structure 803 of the drying mechanism 8 generates heat at the lower part of the air guide cover 801 after being energized; S53: The air blowing mechanism 802 generates airflow and blows the heat gathered at the lower part of the air guide cover 801 to the periphery of the steel mesh so that the steel mesh is dried.

[0037] In summary, the present invention provides a method for automatically cleaning a stencil of a solder paste printer, and proposes a device for automatically cleaning a stencil of a solder paste printer, which comprises: a closed box structure 1, an ultrasonic cleaning bin 2, a circulating spraying mechanism 3, a detergent storage bin 4, a stencil lifting mechanism 5, a first wind scraper lifting mechanism 6, a second wind scraper lifting mechanism 7, and a drying mechanism 8; the ultrasonic cleaning bin 2 is arranged in the closed box structure 1, the circulating spraying mechanism 3 is adjacent to the ultrasonic cleaning bin 2 and is arranged in the closed box structure 1, the circulating spraying mechanism 3 is connected to the ultrasonic cleaning bin 2, and the detergent storage bin 4 is connected to the ultrasonic cleaning bin 2. The storage bin body 4 is arranged between the ultrasonic cleaning bin body 2 and the circulating spray mechanism 3, and the detergent storage bin body 4 is respectively connected to the ultrasonic cleaning bin body 2 and the circulating spray mechanism 3; the steel mesh lifting action mechanism 5 is arranged across both sides of the ultrasonic cleaning bin body 2, and the steel mesh lifting action mechanism 5 movably connects the steel mesh to be cleaned in the ultrasonic cleaning bin body 2; the first wind scraper lifting action mechanism 6 and the second wind scraper lifting action mechanism 7 are respectively arranged on the two side surfaces of the ultrasonic cleaning bin body 2, and the drying mechanism 8 is arranged on the top of the closed box structure 1 above the ultrasonic cleaning bin body 2.

[0038] In addition, the present invention also proposes a solution for deep cleaning the surface of the steel mesh after the steel mesh is removed from the solder paste printer. The steel mesh is first placed in a closed environment, and the surface of the steel mesh is sprayed and soaked by a circulating spray mechanism 3 to facilitate the uniform application of the cleaning agent; then, the surface of the steel mesh is ultrasonically cleaned by an ultrasonic cleaning chamber 2, so that the residual solder paste that adheres to the periphery of the steel mesh mesh and has been solidified gradually softens and falls off; then, the steel mesh lifting mechanism 5 is used to lift the steel mesh that has been sprayed with the cleaning agent and ultrasonically cleaned, so that the surface of the steel mesh is completely exposed outside the ultrasonic cleaning chamber 2; at the same time, the surface of the steel mesh is alternately cleaned by the first wind scraping lifting mechanism 6 and the second wind scraping lifting mechanism 7, specifically: the surface of the steel mesh is sprayed and scraped by the strong airflow sprayed by the first wind scraping lifting mechanism 6 or the second wind scraping lifting mechanism 7, so as to form the action principle of the scraper scraping back and forth, so that the surface of the steel mesh can be further cleaned. After the surface of the steel mesh is cleaned, the drying mechanism 8 dries the surface of the steel mesh. It can be seen that the automatic cleaning method for a solder paste printer steel mesh of the present invention can thoroughly clean the solder paste and other debris remaining on the surface of the steel mesh to ensure the cleanliness of the steel mesh surface after cleaning, avoiding the subsequent manual repeated flushing and cleaning of the steel mesh, and improving the cleaning efficiency of the steel mesh. Therefore, the automatic cleaning method for a solder paste printer steel mesh of the present invention solves the technical problem of how to improve the cleaning efficiency of the steel mesh.

[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for automatically cleaning a steel mesh of a solder paste printer, characterized in that: It includes the following steps: S1: First open the closed box structure, and then clamp the steel mesh to be cleaned in the steel mesh lifting mechanism; S2: After the steel mesh lifting mechanism sends the steel mesh to be cleaned into the ultrasonic cleaning chamber, the circulating spraying mechanism evenly sprays the cleaning agent pre-stored in the solvent and cleaning agent storage chamber onto the surface of the steel mesh sent into the ultrasonic cleaning chamber; S3: The ultrasonic cleaning chamber uses ultrasonic waves to clean the surface of the steel mesh, and at the same time, the circulating spray mechanism continuously sprays the solvent on the surface of the steel mesh; S4: The steel mesh lifting mechanism drives the steel mesh to rise from the ultrasonic cleaning chamber to be exposed; S5: First, the first wind scraper lifting mechanism sprays airflow from bottom to top to clean the surface of one side of the steel mesh, and then the second wind scraper lifting mechanism sprays airflow from bottom to top to clean the surface of the other side of the steel mesh; S6: the first wind scraper lifting mechanism is caused to spray airflow again from top to bottom to clean one side of the steel mesh surface by wind scraping, and the second wind scraper lifting mechanism is caused to spray airflow from top to bottom to clean the other side of the steel mesh surface by wind scraping; S7: The steel mesh lifting mechanism sends the steel mesh into the ultrasonic cleaning chamber again, and continues to repeat steps S to S until the cleanliness of the steel mesh surface meets the preset requirements; S8: After the steel mesh lifting mechanism maintains the steel mesh at the preset highest position, the drying mechanism starts and dries the surface of the steel mesh. After that, the user can open the closed box structure and take away the cleaned steel mesh.

2. The method for automatically cleaning a steel mesh of a solder paste printer according to claim 1, characterized in that: The method of cleaning the steel mesh using an ultrasonic cleaning chamber includes the following steps: S11: The steel mesh lifting mechanism sinks the steel mesh to be cleaned into the accommodating cavity of the ultrasonic cleaning chamber; S12: The circulating spray mechanism sprays the solvent and the cleaning agent used for washing evenly on the surface of the steel mesh, and at the same time, the solvent in the accommodating cavity can cover the surface to be cleaned of the steel mesh; S13: A plurality of ultrasonic working units evenly distributed between the shell structure and the accommodating cavity are started simultaneously, and emit ultrasonic waves to both sides of the steel mesh, so that the debris on both sides of the steel mesh is softened, loosened or dissolved in the solvent under the action of ultrasonic waves; S14: The steel mesh lifting mechanism lifts the steel mesh that has completed one ultrasonic cleaning cycle to a position completely out of the accommodating cavity; S15: After completing one ultrasonic cleaning cycle, the solvent is discharged from the waste discharge unit to the outside of the accommodating cavity.

3. The method for automatically cleaning a stencil of a solder paste printer according to claim 2, characterized in that: The method of using a circulating spray mechanism to spray and wet the surface of the steel mesh to be cleaned comprises the following steps: S21: A circulation pump is connected to the circulation support seat provided in the closed box structure, and the circulation pump is connected to the low-zone circulation pipeline and the high-zone circulation pipeline respectively, and the low-zone circulation pipeline is connected to the lower part of the ultrasonic cleaning chamber body, and the high-zone circulation pipeline is connected to the upper part of the ultrasonic cleaning chamber body; at the same time, the detergent storage chamber body is connected between the high-zone circulation pipeline and the ultrasonic cleaning chamber body; S22: The circulation pump sprays the detergent in the detergent storage bin through the high zone circulation pipeline from the high position of the steel mesh in the ultrasonic cleaning bin; S23: The circulation pump draws the cleaning agent and solvent from the lower part of the ultrasonic cleaning chamber through the low-zone circulation pipeline, and then sprays them down from the high position of the steel mesh in the ultrasonic cleaning chamber through the high-zone circulation pipeline to form a spray circulation loop.

4. The method for automatically cleaning a stencil of a solder paste printer according to claim 3, characterized in that: The method of using a steel mesh lifting mechanism to drive a steel mesh to be cleaned comprises the following steps: S31: After the closed box structure is opened, the steel mesh to be cleaned is clamped and limited by the steel mesh clamp provided in the steel mesh lifting mechanism, and then the closed box structure is closed again; S32: The two steel mesh lifting driving cylinders provided in the steel mesh lifting mechanism simultaneously drive the two lifting telescopic rods to descend and retract, so that the two lifting telescopic rods simultaneously pull the steel mesh clamp and the clamped steel mesh at both ends of the steel mesh clamp to descend into the accommodating cavity; S33: After completing a single spray and ultrasonic cleaning, the two steel mesh lifting drive cylinders simultaneously drive the two steel mesh lifting telescopic rods to rise simultaneously to respectively support the two ends of the steel mesh clamp, thereby pulling up the steel mesh clamp and the clamped steel mesh to leave the accommodating range of the accommodating cavity.

5. The method for automatically cleaning a steel mesh of a solder paste printer according to claim 4, characterized in that: The method for cleaning the steel mesh by using the first wind scraper lifting mechanism and the second wind scraper lifting mechanism comprises the following steps: S41: After the steel mesh lifting mechanism supports the steel mesh that has been sprayed and ultrasonically cleaned above the ultrasonic cleaning chamber, the wind scraping nozzle structure provided by the first wind scraping lifting mechanism is driven by two supporting telescopic rods to spray and scrape upward from the bottom of the clamped steel mesh along the top thereof, so that the debris adhered to one side of the steel mesh is cleaned by the airflow; S42: After the wind scraper nozzle structure of the first wind scraper lifting mechanism is raised to the upper limit position, the wind scraper nozzle structure of the second wind scraper lifting mechanism is also driven by the two supporting telescopic rods to scrape upward from the bottom of the clamped steel mesh along the top thereof, so that the debris adhered to the other side of the steel mesh is cleaned by the airflow; S43: The two wind scraping nozzle structures provided in the first wind scraping lifting action mechanism and the second wind scraping lifting action mechanism move alternately from the upper limit position from top to bottom, and respectively spray and scrape the two sides of the steel mesh; until the two wind scraping nozzle structures reach the lower limit position, the single spraying and scraping treatment is completed, and the steel mesh lifting action mechanism returns the steel mesh that has completed the spraying and scraping cleaning to the ultrasonic cleaning chamber, or suspends the steel mesh above the ultrasonic cleaning chamber to wait for the drying process.

6. The method for automatically cleaning a steel mesh of a solder paste printer according to claim 5, characterized in that: The method of drying the steel mesh using a drying mechanism comprises the following steps: S51: The steel mesh lifting mechanism suspends the cleaned steel mesh above the ultrasonic cleaning chamber; S52: The heating structure provided in the drying mechanism generates heat at the lower part of the air guide cover after being energized; S53: The air blowing mechanism generates airflow and blows the heat gathered at the lower part of the air guide cover to the periphery of the steel mesh, so that the steel mesh is dried.

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