Surface printing device for SMT steel mesh production

Abstract

The utility model discloses a surface printing device for SMT (Surface Mount Technology) steel mesh production, which belongs to the technical field of SMT production tools and comprises a bottom plate and a steel mesh, and a group of clamping components, a group of paste scraping components and a group of printing components are assembled on the upper end surface of the bottom plate. The surface printing device for SMT steel mesh production has the advantages of improving the solder paste utilization rate, reducing the product reject ratio and being high in adaptability, the two paste scraping plates can synchronously move in a centering mode by controlling the second driving motor, overflowing solder paste is scraped to the middle of a steel mesh, recycling of the solder paste is achieved, waste of the solder paste is reduced, and the production cost is reduced. The recovered solder paste can be used for printing again, the utilization rate is increased, the production cost is reduced, the solder paste is collected in the middle of the steel mesh in a centralized mode, the opportunity that the solder paste is exposed in the air for a long time is reduced, the risk of solder paste volatilization is reduced, the performance of the solder paste can be kept, and therefore the subsequent welding quality is improved, the welding defects are reduced, and the production efficiency is improved. The product reject ratio is reduced and the product quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of SMT production tooling, and particularly relates to a surface printing device for SMT stencil production. Background Technique

[0002] SMT stencil printing is an important process in the field of electronic manufacturing. During the circuit board manufacturing process, SMT stencil printing is used to accurately print solder paste or conductive adhesive on the PCB for subsequent mounting processes. This printing process uses a printing mold called an SMT stencil. Through this mold, the solder paste or conductive adhesive is accurately printed onto the pad positions of the PCB so that SMT components can be accurately mounted onto the PCB during subsequent assembly processes. The quality and accuracy of SMT stencil printing have an important impact on the performance and reliability of electronic products, so it plays a key role in electronic manufacturing.

[0003] In the prior art, when the squeegee is in the printing process, excess solder paste will overflow from both sides of the squeegee and accumulate on the stencil. The accumulated solder paste cannot be recycled in a timely manner, which easily causes waste of solder paste. At the same time, the overflowed solder paste will volatilize and become ineffective when exposed to air for a long time, affecting the subsequent welding quality and easily increasing the defective rate of products. Therefore, a surface printing device for SMT stencil production is proposed to solve the above problems. Content of the Utility Model

[0004] In view of one or more of the above defects or improvement requirements of the prior art, the utility model provides a surface printing device for SMT stencil production, which has the advantages of improving the utilization rate of solder paste, reducing the defective rate of products, and strong adaptability.

[0005] To achieve the above object, the utility model provides a surface printing device for SMT stencil production, including a bottom plate and a stencil;

[0006] A set of clamping components, a set of paste scraping components and a set of printing components are assembled on the upper end surface of the bottom plate;

[0007] The clamping component includes two first positioning blocks arranged in parallel. A first left - right hand threaded rod penetrates between the two first positioning blocks. One side of the upper end surface of the bottom plate is assembled with a first driving motor. One end of the first left - right hand threaded rod is connected to the output end of the first driving motor. A first slider is respectively engaged and slid on the external left - right hand threaded parts of the first left - right hand threaded rod. An L - shaped clamping plate is assembled on the upper end surface of each of the two first sliders, and the two L - shaped clamping plates are arranged in parallel facing each other. The stencil is assembled between the two L - shaped clamping plates;

[0008] The paste scraping assembly includes a support block, two second positioning blocks are assembled on the upper end surface of the support block, a second left-right threaded rod penetrates between the two second positioning blocks, a second driving motor is assembled on one side of the upper end surface of the support block, one end of the second left-right threaded rod is connected to the output end of the second driving motor, a second slider is respectively engaged and slidably arranged on the external left-right threaded parts of the second left-right threaded rod, connecting plates are assembled on the upper end surfaces of the two second sliders, scraping plates are assembled on the lower end surfaces of the two connecting plates, and the lower ends of the two scraping plates are attached to the steel mesh.

[0009] As a further improvement of the present invention, the printing assembly includes a lead screw seat, the lead screw seat has a rectangular cavity and a third driving motor is assembled in the rectangular cavity, a threaded lead screw is connected to the output end of the third driving motor, a sliding block is engaged and slidably arranged on the external thread of the threaded lead screw, a positioning plate is assembled on one side of the upper end of the sliding block, a guide rod cylinder is assembled at the center point of the upper end surface of the positioning plate, a cylinder guide rod is connected to the output end of the guide rod cylinder and one end of the cylinder guide rod penetrates the positioning plate and is connected to a mounting plate, a scraper is assembled on the lower end surface of the mounting plate and the scraper is located above the two paste scraping plates.

[0010] As a further improvement of the present invention, the upper end surface of the bottom plate has a rectangular groove and a slide rail is assembled on one side of the rectangular groove, two fitting blocks are fitted and slidably arranged in the slide rail, and the two fitting blocks are respectively connected to the lower end surfaces of the L-shaped clamping plates on the same side.

[0011] As a further improvement of the present invention, the connections between the two paste scraping plates and the upper connecting plates are all of detachable design.

[0012] As a further improvement of the present invention, two limiting rods penetrate the upper end surface of the positioning plate and the lower ends of the two limiting rods are both connected to the mounting plate.

[0013] As a further improvement of the present invention, two fixing blocks are assembled on one side of the upper end surface of the bottom plate, a sliding rod is assembled between the two fixing blocks, a limiting block is slidably arranged on the external part of the sliding rod, and the upper end surface of the limiting block is connected to the positioning plate.

[0014] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present invention include:

[0015] 1. The surface printing device for SMT stencil production of the present utility model, through the mutual cooperation among the components in the paste scraping assembly, by controlling the second driving motor to drive the second right and left hand threaded rod connected to the output end to rotate, the two paste scraping plates meshed and slidably arranged outside the second right and left hand threaded rod can be synchronously centered and moved, so as to scrape the overflowed solder paste to the middle of the stencil, realizing the recycling of the solder paste, reducing the waste of the solder paste, enabling the recycled solder paste to be used for printing again, improving the utilization rate, reducing the production cost. By concentrating the solder paste in the middle of the stencil, the chance of the solder paste being exposed to the air for a long time is reduced, the risk of the solder paste volatilizing is reduced, which helps to maintain the performance of the solder paste, thereby improving the subsequent welding quality, reducing welding defects, reducing the product rejection rate, and improving the product quality.

[0016] 2. The surface printing device for SMT stencil production of the present utility model, through the mutual cooperation among the components in the clamping assembly, by controlling the first driving motor, the two L-shaped clamping plates can be centered and moved or expanded outwards, so as to realize the quick installation or quick disassembly of the stencil, reducing the time for stencil replacement and adjustment, which helps to improve the overall production efficiency. The adjustability between the two L-shaped clamping plates enables the device to quickly install stencils of different sizes, with strong adaptability and versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall installation structure of the present utility model;

[0018] Figure 2 is a schematic diagram of the disassembly structure of the clamping assembly of the present utility model;

[0019] Figure 3 is a schematic diagram of the installation structure of the paste scraping assembly of the present utility model;

[0020] Figure 4 is a schematic diagram of the installation structure of the printing assembly of the present utility model.

[0021] In all the drawings, the same reference numerals represent the same technical features, specifically: 1, base plate; 2, clamping assembly; 20, first positioning block; 21, first right and left hand threaded rod; 22, first driving motor; 23, first slider; 24, L-shaped clamping plate; 25, slide rail; 26, fitting block; 3, stencil; 4, paste scraping assembly; 40, support block; 41, second positioning block; 42, second right and left hand threaded rod; 43, second driving motor; 44, second slider; 45, connecting plate; 46, paste scraping plate; 5, printing assembly; 50, screw rod seat; 51, third driving motor; 52, threaded screw rod; 53, sliding block; 54, positioning plate; 55, guide rod cylinder; 551, cylinder guide rod; 56, mounting plate; 57, squeegee; 58, limiting rod; 59, limiting block; 591, fixing block; 592, sliding rod. Detailed implementation mode

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] Embodiment

[0024] As shown by Figures 1-4 a surface printing device for SMT stencil production, comprising a bottom plate 1 and a stencil 3;

[0025] A set of clamping components 2, a set of paste scraping components 4 and a set of printing components 5 are assembled on the upper end surface of the bottom plate 1;

[0026] The clamping component 2 includes two first positioning blocks 20 arranged in parallel. A first left - right hand threaded rod 21 passes through between the two first positioning blocks 20. A first driving motor 22 is assembled on one side of the upper end surface of the bottom plate 1. One end of the first left - right hand threaded rod 21 is connected to the output end of the first driving motor 22. A first slider 23 is respectively meshed and slidably arranged at the external left - right hand threaded parts of the first left - right hand threaded rod 21. An L - shaped clamping plate 24 is assembled on the upper end surface of each of the two first sliders 23, and the two L - shaped clamping plates 24 are arranged in parallel facing each other. The stencil 3 is assembled between the two L - shaped clamping plates 24;

[0027] The paste scraping component 4 includes a support block 40. Two second positioning blocks 41 are assembled on the upper end surface of the support block 40. A second left - right hand threaded rod 42 passes through between the two second positioning blocks 41. A second driving motor 43 is assembled on one side of the upper end surface of the support block 40. One end of the second left - right hand threaded rod 42 is connected to the output end of the second driving motor 43. A second slider 44 is respectively meshed and slidably arranged at the external left - right hand threaded parts of the second left - right hand threaded rod 42. A connecting plate 45 is assembled on the upper end surface of each of the two second sliders 44. A paste scraping plate 46 is assembled on the lower end surface of each of the two connecting plates 45, and the lower ends of the two paste scraping plates 46 are both in contact with the stencil 3.

[0028] In this embodiment, through the mutual cooperation among the components within the clamping assembly 2, by controlling the first driving motor 22, the two L-shaped clamping plates 24 can be driven to move towards the center or expand outwards, thereby realizing the rapid installation or disassembly of the stencil 3, reducing the time for stencil 3 replacement and adjustment, contributing to improving the overall production efficiency. The adjustability between the two L-shaped clamping plates 24 enables the device to quickly install stencils 3 of different sizes, with strong adaptability and versatility. Through the mutual cooperation among the components within the solder paste scraping assembly 4, by controlling the second driving motor 43 to drive the second left-right threaded screw rod 42 connected to the output end to rotate, the two connecting plates 45 slidably engaged with the outside of the second left-right threaded screw rod 42 can move towards the center synchronously, so that the solder paste scraping plate 46 scrapes the overflowed solder paste to the middle of the stencil 3, realizing the recycling of the solder paste, reducing the waste of the solder paste, enabling the recycled solder paste to be used for printing again, improving the utilization rate, reducing the production cost, collecting the solder paste in the middle of the stencil 3, reducing the chance of the solder paste being exposed to the air for a long time, reducing the risk of solder paste volatilization, contributing to maintaining the performance of the solder paste, thereby improving the subsequent welding quality, reducing welding defects, reducing the product rejection rate, and improving the product quality.

[0029] Specifically, referring to Figures 1-4 , the printing assembly 5 includes a lead screw base 50. The lead screw base 50 has a rectangular cavity, and a third driving motor 51 is assembled in the rectangular cavity. A threaded lead screw 52 is connected to the output end of the third driving motor 51. A sliding block 53 is slidably engaged with the outside of the threaded lead screw 52. A positioning plate 54 is assembled on one side of the upper end of the sliding block 53. A guide rod cylinder 55 is assembled at the center point of the upper end surface of the positioning plate 54. A cylinder guide rod 551 is connected to the output end of the guide rod cylinder 55, and one end of the cylinder guide rod 551 penetrates through the positioning plate 54 and is connected to a mounting plate 56. A squeegee 57 is assembled on the lower end surface of the mounting plate 56, and the squeegee 57 is located above the two solder paste scraping plates 46.

[0030] In this embodiment, by controlling the third driving motor 51, the third driving motor 51 drives the threaded lead screw 52 connected to the output end to rotate. When the threaded lead screw 52 rotates, the sliding block 53 slidably engaged with the outside of the threaded lead screw 52 drives the positioning plate 54 on one side of the upper end to move within the stroke range of the threaded lead screw 52. By starting and controlling the guide rod cylinder 55, the cylinder guide rod 551 connected to the output end of the guide rod cylinder 55 extends downward, thereby driving the squeegee 57 downward. When the squeegee 57 is in contact with the stencil 3, control the third driving motor 51 to drive the squeegee 57 to move and brush the solder paste on the surface of the stencil 3.

[0031] Specifically, referring to Figure 2, the upper end surface of the bottom plate 1 has a rectangular groove, and a slide rail 25 is assembled on one side of the rectangular groove. Two fitting blocks 26 are slidably fitted in the slide rail 25, and the two fitting blocks 26 are respectively connected to the lower end surfaces of the L-shaped clamping plates 24 on the same side.

[0032] In this embodiment, the provided slide rail 25 and the two fitting blocks 26 are used to limit the two L-shaped clamping plates 24, so that the two L-shaped clamping plates 24 can move more stably.

[0033] Specifically, referring to Figure 3 , the connections between the two scraping plates 46 and the upper connecting plate 45 are both of detachable design.

[0034] In this embodiment, the connections between the two scraping plates 46 and the upper connecting plate 45 are both of detachable design, which makes it convenient to maintain and replace the scraping plates 46 in the later stage.

[0035] Specifically, referring to Figure 4 , two limiting rods 58 penetrate through the upper end surface of the positioning plate 54, and the lower ends of the two limiting rods 58 are both connected to the mounting plate 56.

[0036] In this embodiment, the two provided limiting rods 58 are used to limit the mounting plate 56, so that the mounting plate 56 can move more stably when being driven downward.

[0037] Specifically, referring to Figure 4 , two fixing blocks 591 are assembled on one side of the upper end surface of the bottom plate 1. A sliding rod 592 is assembled between the two fixing blocks 591. A limiting block 59 is slidably arranged outside the sliding rod 592, and the upper end surface of the limiting block 59 is connected to the positioning plate 54.

[0038] In this embodiment, the limiting block 59 is slidably mounted outside the sliding rod 592. When the sliding block 53 is driven to move, with the limiting assistance of the limiting block 59, the positioning plate 54 jointly installed with the upper ends of the sliding block 53 and the limiting block 59 can move more stably.

[0039] The surface printing device for SMT stencils of the present utility model:

[0040] The first step: During actual use, first connect the set first drive motor 22, second drive motor 43, and third drive motor 51 to an external power source, connect the set guide rod cylinder 55 to an external air source and give the cylinder an output value. Then start and control the first drive motor 22, so that the first drive motor 22 drives the first left-right threaded rod 21 connected to the output end to rotate. Through the cooperation of the slide rail 25 and the two fitting blocks 26 to limit the two L-shaped clamping plates 24, when the first left-right threaded rod 21 rotates, the two first sliders 23 meshing and slidingly arranged on the outside of the first left-right threaded rod 21 drive the upper L-shaped clamping plate 24 to move towards the middle, thereby realizing the rapid installation of the stencil 3. Apply solder paste on the stencil 3, use an external adjustment component to drive the PCB board through the rectangular slot on the bottom plate 1 and fit it to the lower end surface of the stencil 3. Then start and control the third drive motor 51, so that the third drive motor 51 drives the threaded rod 52 connected to the output end to rotate. When the threaded rod 52 rotates, the slider 53 meshing and slidingly arranged on the outside of the threaded rod 52 drives the positioning plate 54 on the upper end side to move within the stroke range of the threaded rod 52. By starting and controlling the guide rod cylinder 55, the cylinder guide rod 551 connected to the output end of the guide rod cylinder 55 extends downward, thereby driving the squeegee 57 downward. When the squeegee 57 is in contact with the stencil 3, control the third drive motor 51 to drive the squeegee 57 to move and brush the solder paste on the surface of the stencil 3;

[0041] The second step: When the overflowing solder paste remains on both sides of the stencil 3, first control the guide rod cylinder 55 to drive the squeegee 57 to rise, and then start and control the second drive motor 43, so that the second drive motor 43 drives the second left-right threaded rod 42 connected to the output end to rotate. When the second left-right threaded rod 42 rotates, the two second sliders 44 meshing and slidingly arranged at the left-right threaded parts on the outside of the second left-right threaded rod 42 drive the upper connecting plate 45 to move towards the middle, so that the two solder paste scraping plates 46 scrape the overflowing solder paste on both sides of the stencil 3 to the middle of the stencil 3, and cooperate with the squeegee 57 to recycle the solder paste and improve the utilization rate of the solder paste.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A surface printing device for SMT steel mesh production, comprising a base plate (1) and a steel mesh (3), characterized in that: The upper end surface of the bottom plate (1) is equipped with a group of clamping components (2), a group of scraping components (4) and a group of printing components (5); The clamping assembly (2) comprises two first positioning blocks (20) arranged in parallel, a first positive and negative threaded rod (21) is provided between the two first positioning blocks (20), a first driving motor (22) is mounted on one side of the upper end surface of the base plate (1), one end of the first positive and negative threaded rod (21) is connected to the output end of the first driving motor (22), a first slider (23) is provided at the positive and negative teeth of the outer side of the first positive and negative threaded rod (21) for meshing and sliding, the upper end surfaces of the two first sliders (23) are both equipped with L-shaped clamping plates (24), and the two L-shaped clamping plates (24) are arranged in parallel and opposite directions, and the steel mesh (3) is mounted between the two L-shaped clamping plates (24); The scraper assembly (4) comprises a support block (40), the upper end surface of the support block (40) is equipped with two second positioning blocks (41), a second positive and negative threaded rod (42) is provided between the two second positioning blocks (41), a second drive motor (43) is equipped on one side of the upper end surface of the support block (40), one end of the second positive and negative threaded rod (42) is connected to the output end of the second drive motor (43), a second slider (44) is provided at the positive and negative teeth of the outer side of the second positive and negative threaded rod (42) for meshing and sliding, the upper end surfaces of the two second sliders (44) are both equipped with connecting plates (45), the lower end surfaces of the two connecting plates (45) are both equipped with scraper plates (46), and the lower ends of the two scraper plates (46) are both in contact with the steel mesh (3).

2. The surface printing device for SMT steel mesh production according to claim 1, characterized in that: The printing assembly (5) comprises a screw seat (50), the screw seat (50) having a rectangular cavity and a third drive motor (51) mounted in the rectangular cavity, the output end of the third drive motor (51) being connected to a threaded screw (52), the threaded screw (52) being externally meshed and slidably provided with a sliding block (53), one side of the upper end of the sliding block (53) being provided with a positioning plate (54), a guide rod cylinder (55) being mounted at the center point of the upper end surface of the positioning plate (54), the output end of the guide rod cylinder (55) being connected to a cylinder guide rod (551), one end of the cylinder guide rod (551) passing through the positioning plate (54) and being connected to a mounting plate (56), a scraper (57) being mounted on the lower end surface of the mounting plate (56), and the scraper (57) being located above the two scraping plates (46).

3. The surface printing device for SMT steel mesh production according to claim 1, characterized in that: The upper end surface of the bottom plate (1) is provided with a rectangular groove and a slide rail (25) is mounted on one side of the rectangular groove. Two engaging blocks (26) are slidably engaged in the slide rail (25). The two engaging blocks (26) are respectively connected to the lower end surface of the L-shaped clamping plate (24) on the same side.

4. The surface printing device for SMT steel mesh production according to claim 1, characterized in that: The connection points between the two scraping plates (46) and the upper connecting plate (45) are both detachable.

5. The surface printing device for SMT steel mesh production according to claim 2, characterized in that: Two limiting rods (58) are provided through the upper end surface of the positioning plate (54), and the lower ends of the two limiting rods (58) are connected to the mounting plate (56).

6. The surface printing device for SMT steel mesh production according to claim 2, characterized in that: Two fixed blocks (591) are installed on one side of the upper end surface of the bottom plate (1), a sliding rod (592) is installed between the two fixed blocks (591), a limit block (59) is slidably provided outside the sliding rod (592), and the upper end surface of the limit block (59) is connected to the positioning plate (54).

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