A cleaning suction nozzle structure for a steel mesh of a tin paste printing machine

Abstract

The utility model discloses a kind of cleaning suction nozzle structures for steel mesh of solder paste printing machine, including the suction nozzle body with suction hole, the surface of steel mesh is implemented as cleaning surface when suction nozzle body cleaning steel mesh, cleaning surface is divided into dry cleaning area and wet cleaning area, wherein suction hole is set in dry cleaning area and at the extension direction of suction hole Both sides are provided with at least one protruding from cleaning surface Rubber strip, any end of any rubber strip is not shorter than the corresponding end of suction hole, at least one cleaning sponge protruding from cleaning surface is provided in wet cleaning area. Dry cleaning and wet cleaning cleaning structure are set on the same suction nozzle, dry cleaning and wet cleaning can be carried out, there is no need to replace suction nozzle when cleaning mode switches, can save the operation time of cleaning process, improve production efficiency, also can reduce production cost, can improve the solder paste cleaning quality of suction nozzle.

Description

Technical Field

[0001] This utility model relates to the field of SMT technology, specifically to a cleaning nozzle structure for a stencil of a solder paste printer. Background Technology

[0002] SMT is short for Surface Mount Technology, also known as Surface Mount Technology or Surface Mount Technology. A pick-and-place machine, also known as a placement machine or surface mount system, is a device that is placed on the PCB pads by moving the placement head after the dispensing machine or screen printer in the production line.

[0003] Solder paste printing is a crucial step in the SMT production line, directly determining the quality of the SMT process. After use, the solder paste and other contaminants adhering to the stencil must be cleaned off to prevent contamination of the workpieces in subsequent batches, thus affecting product quality. Traditional stencil cleaning is done manually, which is inefficient and incomplete. Now, fully automatic SMT stencil cleaning machines exist, offering high efficiency and thorough cleaning. For example, Chinese patent document CN203901957U discloses an automatic stencil cleaning device, including a cleaning head, which further comprises a suction nozzle connected to a connecting rod and a heating block fixed to the suction nozzle. The connecting rod contains a pipe communicating with the suction nozzle. The specific structure of the suction nozzle in the aforementioned technical solution is not explicitly described in its specification. The suction nozzle currently used by the applicant for stencil cleaning is similar to the aforementioned technical solution, consisting only of a long, narrow plate structure with suction holes. This type of suction nozzle has a relatively simple structure and can only remove the molten solder paste from the stencil through the suction holes. This cleaning mode is a dry cleaning mode. Some stencil cleaning methods use a wet cleaning mode similar to cleaning rollers or cleaning cloths. However, both dry and wet cleaning modes exist independently and suffer from long cleaning times, necessitating further improvements. Therefore, this utility model was developed. Utility Model Content

[0004] In view of at least one of the above-mentioned technical problems, the purpose of this utility model is to provide a cleaning nozzle structure for a stencil of a solder paste printing machine.

[0005] The technical solution of this utility model is:

[0006] The purpose of this utility model is to provide a cleaning nozzle structure for a stencil of a solder paste printing machine, including a nozzle body with an air suction hole. When cleaning the stencil, the surface of the nozzle body facing the stencil is the cleaning surface. The cleaning surface is divided into a dry cleaning area and a wet cleaning area. The air suction hole is opened in the dry cleaning area, and at least one rubber strip protruding from the cleaning surface is provided on both sides of the extension direction of the air suction hole. Each end of any rubber strip is not shorter than the corresponding end of the air suction hole. At least one cleaning sponge protruding from the cleaning surface is provided in the wet cleaning area.

[0007] Preferably, the cleaning surface is square, the dry cleaning area and the wet cleaning area are arranged side by side along the width direction of the cleaning surface, and the air suction hole extends along the length direction of the cleaning surface.

[0008] Preferably, the suction nozzle body is square, and the cleaning surface is a surface in the thickness direction.

[0009] Preferably, each side of the air intake hole is provided with a sealing strip, and both ends of any sealing strip extend beyond the two ends of the air intake hole.

[0010] Preferably, one end of any of the adhesive strips protrudes from the cleaning surface in a triangular shape.

[0011] Preferably, any of the adhesive strips includes a first adhesive strip segment and a second adhesive strip segment arranged perpendicularly to each other, wherein the end of the first adhesive strip segment away from the second adhesive strip segment is triangular;

[0012] On the cleaning surface of the nozzle body, there are grooves on both sides of the suction hole, which are recessed towards the side opposite to the cleaning surface and extend along the length direction of the nozzle body. The shape of the groove matches the adhesive strip. Any adhesive strip slides and engages with the corresponding groove along the extension direction of its corresponding groove.

[0013] Preferably, any of the cleaning sponges extends along the length of the nozzle body or the cleaning surface.

[0014] Preferably, the number of cleaning sponges is at least two, and the at least two cleaning sponges are arranged side by side at intervals along the width direction of the suction nozzle body or the cleaning surface.

[0015] Preferably, the wet cleaning area has a groove that is recessed from the cleaning surface toward the corresponding side and extends along the length of the cleaning surface or the suction nozzle body, and any of the cleaning sponges is detachably fixed in the corresponding groove.

[0016] Preferably, the surface of the suction nozzle body opposite to the cleaning surface is configured as a connecting surface, and a slot extending along the length direction of the suction nozzle body is formed on the connecting surface. The two ends of the slot are not shorter than the two ends of the suction hole, and the width of the slot is greater than the width of the suction hole.

[0017] The groove is provided with a number of partition blocks spaced apart along its length, and the groove does not penetrate the cleaning surface at the positions corresponding to the wet cleaning area and the dry cleaning area near the wet cleaning area where the adhesive strip is located.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] This utility model discloses a cleaning nozzle structure for a solder paste printing machine stencil. The nozzle incorporates both dry and wet cleaning mechanisms, allowing for both dry and wet cleaning without the need to change nozzles during cleaning mode switching. This saves cleaning time, improves production efficiency, and reduces production costs. Adhesive strips on both sides of the suction port ensure airtightness, allowing the suction port to pick up residual solder paste from inside the stencil mesh. The protruding cleaning surface of the adhesive strips also helps to scrape away residual solder paste from the back of the stencil, improving the cleaning quality of the nozzle. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a top view of the cleaning nozzle structure for the stencil of the solder paste printer according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A side view of the nozzle structure;

[0023] Figure 3 for Figure 1 A partial enlarged view of the nozzle body of the nozzle structure;

[0024] Figure 4 for Figure 1 A magnified view of the adhesive strip of the suction nozzle structure;

[0025] Figure 5 for Figure 1 A bottom view of the suction nozzle structure;

[0026] Figure 6 for Figure 1 A longitudinal sectional view of the nozzle structure.

[0027] The components are as follows: 10. Nozzle body; 11. Sweeping surface; 111. Dry cleaning area; 112. Wet cleaning area; 12. Connecting surface; 121. Groove; 1211. Hole; 122. Partition; 13. Slot; 14. Groove; 20. Suction hole; 30. Adhesive strip; 31. First adhesive strip segment; 32. Second adhesive strip segment; 40. Cleaning sponge. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0029] See Figures 1 to 6The cleaning nozzle structure for the stencil of the solder paste printing machine according to this utility model includes a nozzle body 10. The nozzle body 10 has a suction hole 20 that is connected to a suction pipe (not shown, the suction pipe is connected to a filter and a blower to form a negative pressure vacuum pipeline). The solder paste on the stencil is sucked away by the suction pipe and the suction hole 20. More specifically, when cleaning the steel mesh, the surface of the suction nozzle body 10 facing the steel mesh is implemented as the cleaning surface 11. The main improvement of this utility model is that the cleaning surface 11 of the suction nozzle body 10 has a dry cleaning area 111 and a wet cleaning area 112. The dry cleaning area 111 is provided with a suction hole 20, and at least one rubber strip 30 protruding from the cleaning surface 11 is provided on both sides of the extension direction of the suction hole 20. Any end of any rubber strip 30 is not shorter than the corresponding end of the suction hole 20. That is to say, the length of any rubber strip 30 is not less than the length of the suction hole 20. Any rubber strip 30 can have one end flush with the corresponding end of the suction hole 20 and the other end also flush with the other end of the suction hole 20. Alternatively, one end of any rubber strip 30 can be flush with the corresponding end of the suction hole 20, but the other end extends beyond the other end of the suction hole 20. Or, both ends of any rubber strip 30 can extend beyond both ends of the suction hole 20. This design ensures the airtightness of the air pressure, allowing the suction port 20 to pick up residual solder paste inside the stencil mesh when cleaning the solder paste. Simultaneously, the adhesive strip 30, with its protruding cleaning surface 11, scrapes away residual solder paste on the back of the stencil during cleaning. In the wet cleaning zone 112, at least one cleaning sponge 40, also protruding from the cleaning surface 11, is provided. During cleaning, the cleaning paper is sprayed with solvent through the solvent spray pipe, and then the cleaning sponge 40 performs wet cleaning of the solder paste on the stencil surface. When wet cleaning is not required, the solvent is not sprayed. The structure is simple and highly practical. Both dry and wet cleaning structures are integrated into the same suction nozzle structure, allowing selection of the appropriate cleaning structure as needed. There is no need to change the suction nozzle when switching cleaning modes, saving cleaning time, improving production efficiency, and reducing production costs. Meanwhile, adhesive strips 30 protruding from the cleaning surface 11 are provided on both sides of the suction hole 20. On the one hand, the adhesive strips 30 can scrape away the residual solder paste on the stencil. On the other hand, during cleaning, the adhesive strips 30 are in close contact with the stencil surface to ensure the air pressure is sealed so as to absorb the residual solder paste in the stencil mesh, thereby improving the solder paste cleaning quality of the nozzle.

[0030] Furthermore, in some embodiments, the cleaning surface 11 of the suction nozzle body 10 of this invention is square, such as rectangular or square. However, the shape of the suction nozzle body 10 is not limited, that is, it does not necessarily have to be square, and can be other geometric shapes such as circles. Taking a rectangle as an example, the dry cleaning area 111 and the wet cleaning area 112 are arranged side by side along the width direction of the cleaning surface 11, and the extension direction of the suction hole 20 is along the length direction of the cleaning surface 11. This design can increase the diameter of the suction hole 20, thereby increasing the area covered by the suction hole 20 and improving cleaning efficiency.

[0031] Furthermore, in some embodiments, such as Figure 1 As shown, the suction nozzle body 10 of this utility model is square, and the cleaning surface 11 is also square, such as rectangular or square. This embodiment is described using a rectangular shape as an example. Figure 1 and Figure 5 As shown, the cleaning surface 11 is implemented as a surface in the thickness direction of the suction nozzle body 10 (e.g., as shown in the figure). Figure 1 As shown in the upper surface), the suction hole 20 extends through both surfaces of the nozzle body 10 in the thickness direction.

[0032] For the dry cleaning area 111 and the wet cleaning area 112, it is preferable that each occupies half of the area of ​​the cleaning surface 11. The width of the suction hole 20 shall not exceed one-third of the area of ​​the dry cleaning area 111, for example, one-quarter, without further description or limitation.

[0033] Regarding the quantity of 30 adhesive strips, such as Figure 1 As shown, in this practical embodiment, two adhesive strips are preferred, that is, an adhesive strip 30 is provided on each side of the air intake 20, and the two ends of any adhesive strip 30 extend beyond the two ends of the air intake 20. Specifically, as shown... Figures 1 to 3 As shown, both ends of any adhesive strip 30 extend to the two ends of the cleaning surface 11 along its length. That is, the length of any adhesive strip 30 is the same as the length of the nozzle body 10 or the cleaning surface 11, while the length of the suction hole 20 is less than the length of the nozzle body 10 or the cleaning surface 11. Specific details are not described or limited. Regarding the structure of any adhesive strip 30, as... Figure 2 and Figure 4 and Figure 6As shown, the adhesive strip 30 includes a first adhesive strip segment 31 and a second adhesive strip segment 32 arranged perpendicularly to each other, forming a T-shaped structure. The end of the first adhesive strip segment 31 furthest from the second adhesive strip segment 32, i.e., the outer end of the adhesive strip 30, is triangular (one side of the outer end can be beveled, the other straight, or both sides can be beveled) with a pointed tip. This pointed tip design facilitates the scraping away of solder paste residue on the stencil. The width of any adhesive strip 30 is not described or limited. In this embodiment, the adhesive strip 30 is installed and connected to the nozzle body 10 via a snap-fit ​​method, facilitating disassembly, replacement, and assembly. Specifically, as shown... Figure 3 As shown, the cleaning surface 11 of the suction nozzle body 10 is provided with a side facing opposite to the cleaning surface 11, namely the connecting surface 12, or as shown. Figure 3 The recessed groove 13 shown is matched to the shape of the adhesive strip 30, i.e., it is also T-shaped. When installing the adhesive strip 30, the second section 32 of any adhesive strip 30 faces downwards, the first section 31 faces upwards, and one end of the adhesive strip 30 is first inserted into one end of the corresponding groove 13. Then, the adhesive strip 30 is slid towards the other end until the first inserted end of the adhesive strip 30 reaches the other end of the groove 13. To prevent the adhesive strip 30 from easily detaching from the groove 13, in this embodiment of the invention, the adhesive strip 30 preferably uses a conventional rubber strip 30, and its size is designed to be slightly larger than the size of the groove 13. The compressibility of the adhesive strip 30 allows it to be tightly fitted into the groove 13, meaning there is no gap between the adhesive strip 30 and the groove 13.

[0034] In a preferred embodiment of this utility model, the cleaning sponge 40 is designed to extend along the length of the suction nozzle body 10 or the cleaning surface 11, that is, the extension direction of the cleaning sponge 40 is parallel to the extension direction of the adhesive strip 30. Regarding the number of cleaning sponges 40, as follows... Figure 1 As shown, in this embodiment of the present invention, two cleaning sponges are preferably arranged parallel to each other and spaced apart along the width direction of the cleaning surface 11 or the suction nozzle body 10. The width of any cleaning sponge 40 is not described or limited, but preferably, the width of any cleaning sponge 40 is greater than the width of the adhesive strip 30; the specific width ratio is not described or limited. Regarding the length of any cleaning sponge 40, it is preferably not greater than the length of the cleaning surface 11 or the suction nozzle body 10; the specific length is not described or limited. Similarly, any cleaning sponge 40 is detachably installed on the cleaning surface 11, specifically, as shown... Figure 3 As shown, the specific installation position of any cleaning sponge 40 is such that a groove 14 is formed on the wet cleaning surface 11, which is recessed from the cleaning surface 11 toward the corresponding surface and extends along the length of the nozzle body 10 or the cleaning surface 11. Any cleaning sponge 40 is fixed in the corresponding groove 14 by adhesive. Optionally, the length of the cleaning sponge 40 is less than the length of its corresponding groove 14.

[0035] like Figure 5 As shown, for ease of description and distinction, the surface of the nozzle body 10 opposite to the cleaning surface 11 is described as the connecting surface 12, that is, the surface for fixed connection between the nozzle body 10 and the nozzle mounting base (not shown). Figure 5 (The middle part is the upper surface). In some optional embodiments, a connecting structure, such as a magnetic connection structure (not shown), can be provided on the connecting surface 12. In this embodiment of the present invention, a waist-shaped slot 121 extending along the length direction of the suction nozzle body 10 is opened in the middle of the connecting surface 12. The slot 121 communicates with the suction hole 20, and both ends of the slot 121 are not shorter than the two ends of the suction hole 20. In this embodiment of the present invention, Figure 5 The design prioritizes uniformity. A plurality of spaced partitions 122 are provided along the length of the slot 121. The two ends of any partition 122 are recessed towards the other end, thus dividing a long slot 121 into multiple shorter, waist-shaped slots 1211. Each slot 1211 is of uniform size and does not completely penetrate the cleaning surface 11. Specifically, each slot 1211 is not penetrating the wet cleaning area 112 or the dry cleaning area near the suction port 20 (the adhesive strip 30), but it is penetrating the area corresponding to the suction port 20. This design increases the negative pressure difference, ensuring sufficient suction to effectively remove residual solder paste from the stencil mesh and prevent clogging.

[0036] In this embodiment of the invention, the height of the adhesive strip 30 protruding from the cleaning surface 11 is approximately the same as or slightly higher than the height of the cleaning sponge 40 protruding from the cleaning surface 11. Since the cleaning sponge 40 is more compressible, the specific height is not described or limited.

[0037] In this embodiment of the invention, when using the dry cleaning mode, the adhesive strip 30 is pressed tightly onto the surface of the stencil. The nozzle body 10 is moved so that the adhesive strip 30 can scrape away the solder paste on the stencil surface. Then, the vacuum negative pressure device and proportional blower generate negative pressure in the suction port 20. Since the adhesive strip 30 is located on both sides of the suction port 20, the air pressure is sealed so that the suction port 20 can also suck up residual solder paste inside the stencil mesh when sucking up solder paste on the stencil. It should be noted that in the dry cleaning mode, no solvent is sprayed onto the cleaning paper (the adsorption medium for cleaning solder paste and flux on the stencil surface), and the cleaning sponge 40 has no cleaning effect. When the wet cleaning mode is selected, solvent is sprayed onto the cleaning paper. After the cleaning sponge 40 absorbs the solvent, it can wipe and clean the stencil surface. The solvent can enter and penetrate the stencil mesh to clean away the solder paste residue inside the mesh. In use, cleaning is done area by area. Dry cleaning can be performed on the first area to be cleaned, and then the dry cleaning structure can be moved to the next area. Simultaneously, the wet cleaning structure can be moved to an area that has already been dry-cleaned, where solvent can be sprayed onto the cleaning paper for wet cleaning. That is, dry cleaning precedes wet cleaning, and so on, cleaning all areas sequentially. Alternatively, the process can be reversed, i.e., wet cleaning followed by dry cleaning. In summary, the suction nozzle structure of this embodiment can perform both dry and wet cleaning simultaneously, improving cleaning quality and reducing product defect rates; it also increases production efficiency and reduces production costs. Furthermore, the rubber strip 30 and cleaning sponge 40 are detachable, allowing for timely replacement. Additionally, since the cleaning surface 11 of the suction nozzle structure does not contact the steel mesh, wear is minimal, durability is improved, and maintenance frequency and costs are reduced.

[0038] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A cleaning nozzle structure for a solder paste printing machine stencil, comprising a nozzle body with suction holes, characterized in that, When the suction nozzle body cleans the steel mesh, the surface facing the steel mesh is the cleaning surface. The cleaning surface is divided into a dry cleaning area and a wet cleaning area. The suction hole is opened in the dry cleaning area, and at least one rubber strip protruding from the cleaning surface is provided on both sides of the extension direction of the suction hole. Each end of the rubber strip is not shorter than the corresponding end of the suction hole. In the wet cleaning area, at least one cleaning sponge protruding from the cleaning surface is provided.

2. The cleaning nozzle structure according to claim 1, characterized in that, The cleaning surface is square, the dry cleaning area and the wet cleaning area are arranged side by side along the width direction of the cleaning surface, and the air suction hole extends along the length direction of the cleaning surface.

3. The cleaning nozzle structure according to claim 2, characterized in that, The suction nozzle body is square, and the cleaning surface is a surface in the thickness direction.

4. The cleaning nozzle structure according to claim 2 or 3, characterized in that, Each side of the air intake hole is provided with a sealing strip, and both ends of each sealing strip extend beyond the two ends of the air intake hole.

5. The cleaning nozzle structure according to claim 4, characterized in that, Each of the adhesive strips protrudes from one end of the cleaning surface in a triangular shape.

6. The cleaning nozzle structure according to claim 5, characterized in that, Each of the adhesive strips includes a first adhesive strip segment and a second adhesive strip segment arranged perpendicularly to each other, wherein the end of the first adhesive strip segment away from the second adhesive strip segment is triangular; On the cleaning surface of the nozzle body, there are grooves on both sides of the suction hole, which are recessed towards the side opposite to the cleaning surface and extend along the length direction of the nozzle body. The shape of the groove matches the adhesive strip. Any adhesive strip slides and engages with the corresponding groove along the extension direction of its corresponding groove.

7. The cleaning nozzle structure according to claim 2 or 3, characterized in that, Any of the cleaning sponges extends along the length of the nozzle body or the cleaning surface.

8. The cleaning nozzle structure according to claim 7, characterized in that, The number of cleaning sponges is at least two, and the at least two cleaning sponges are arranged side by side at intervals along the width direction of the suction nozzle body or the cleaning surface.

9. The cleaning nozzle structure according to claim 8, characterized in that, The wet cleaning area has a groove that is recessed from the cleaning surface toward the corresponding side and extends along the length of the cleaning surface or the nozzle body. Each of the cleaning sponges is detachably fixed in the corresponding groove.

10. The cleaning nozzle structure according to claim 9, characterized in that, The surface of the suction nozzle body opposite to the cleaning surface is configured as a connecting surface. A groove extending along the length direction of the suction nozzle body is formed on the connecting surface. The two ends of the groove are not shorter than the two ends of the suction hole and the width of the groove is greater than the width of the suction hole. The groove is provided with a number of partition blocks spaced apart along its length, and the groove does not penetrate the cleaning surface at the positions corresponding to the wet cleaning area and the dry cleaning area near the wet cleaning area where the adhesive strip is located.

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