Screen printing equipment for electronic products

Abstract

The present invention discloses a screen printing device for electronic products, comprising a first workbench equipped with a first conveyor belt, a second workbench equipped with a second conveyor belt, a connecting roller frame located between the first and second workbench, and a carrier plate for placing circuit boards. A third bracket is provided above the second workbench, a cylinder is mounted on the top of the third bracket, a piston rod of the cylinder passes through the third bracket, and the lower end of the piston rod is connected to a screen frame, a screen base plate is mounted at the bottom of the screen frame, a second chute is mounted on two opposing inner walls of the screen frame and above the screen base plate, each second chute is provided with a slider that can reciprocate within the second chute, a second motor is mounted on one slider, and an inclined scraper is mounted on the mounting rod, with the lower end surface of the scraper contacting the upper surface of the screen base plate. The present invention can ensure the position accuracy of the circuit board during operation, thereby improving the processing accuracy and efficiency.

Description

Technical Field

[0001] The invention relates to a screen printing device for electronic products, belonging to the technical field of electronic product processing equipment. Background Art

[0002] Screen printing refers to the use of silk screen as a base and the use of photosensitive platemaking methods to make a screen printing plate with graphics. Screen printing consists of five major elements: screen printing plate, scraper, ink, printing table and substrate. Printing is based on the basic principle that the mesh holes of the graphic part of the screen printing plate are permeable to ink, while the mesh holes of the non-graphic part are not permeable to ink. When printing, ink is poured into one end of the screen printing plate, and a certain amount of pressure is applied to the inked part of the screen printing plate with a scraper. At the same time, it moves at a constant speed toward the other end of the screen printing plate. During movement, the ink is squeezed from the mesh holes of the graphic part by the scraper onto the substrate. The screen printing device for electronic products such as circuit boards is a device that uses tin powder instead of ink to align the mesh holes with the solder joints on the circuit board for printing.

[0003] When printing on circuit boards, existing screen printing devices for electronic products have the problem that the circuit boards are easily offset and the tin cannot be printed accurately, resulting in insufficient product processing precision and low efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a screen printing device for electronic products, which realizes the automatic operation of loading, transporting and tin powder coating, and can also ensure the position accuracy of the circuit board during the operation, thereby improving the processing accuracy and efficiency.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a screen printing device for electronic products, comprising a first workbench equipped with a first conveyor belt, a second workbench equipped with a second conveyor belt, a connecting roller frame located between the first workbench and the second workbench, and a carrier plate for placing circuit boards, the carrier plate can be conveyed between the first conveyor belt, the connecting roller frame and the second conveyor belt, a third bracket is provided above the second workbench, a cylinder is installed on the top of the third bracket, a piston rod of the cylinder passes through the third bracket and the lower end of the piston rod is connected to a screen printing frame that can move up and down above the second conveyor belt, a screen printing base plate is installed at the bottom of the screen printing frame, at least two positioning posts are provided on the lower surface of the screen printing base plate, and positioning holes that cooperate with the positioning posts are provided on the carrier plate;

[0006] A second slide is installed on each of the two opposite inner walls of the silk-screen frame and above the silk-screen base plate. A slider that can move back and forth in the second slide is provided in each of the second slides. A second motor is installed on one of the sliders. One end of a mounting rod is connected to the output shaft of the second motor. The other end of the mounting rod is rotatably connected to the other slider through a bearing. An inclined scraper is installed on the mounting rod and the lower end surface of the scraper contacts the upper surface of the silk-screen base plate. At least one of the sliders is connected to the driving mechanism. A feed port is provided on the silk-screen frame, and a plurality of evenly distributed discharge through holes are provided in the central area of the silk-screen base plate.

[0007] The further improved scheme in the above technical scheme is as follows:

[0008] 1. In the above scheme, a material guide plate is provided in the silk-screen frame and above the scraper. A concave area is formed on the material guide plate and outside the area of the silk-screen base plate having the discharge through hole. A plurality of discharge holes are opened on the concave area at intervals. A discharge pipe is connected to the bottom of each discharge hole, and a valve is installed on the discharge pipe.

[0009] 2. In the above scheme, two guide block groups are provided on the first conveyor belt and the second conveyor belt. Each guide block group is composed of a plurality of guide blocks arranged in sequence along the forward direction of the loading plate. Two guide grooves for cooperating with the guide block groups are provided on the lower surface of the loading plate.

[0010] 3. In the above scheme, the driving mechanism includes a first motor installed at one end of the second slide groove and a screw rod with one end connected to the output end of the first motor, the other end of the screw rod is rotatably connected to the other end of the second slide groove through a bearing seat, and the slider is mounted on the screw rod and threadedly connected to the screw rod.

[0011] 4. In the above solution, the front end of the guide chute has a trumpet mouth that opens outward.

[0012] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0013] 1. A screen printing device for electronic products according to the present invention comprises a first workbench equipped with a first conveyor belt, a second workbench equipped with a second conveyor belt, a connecting roller frame located between the first workbench and the second workbench, and a loading plate for placing circuit boards, a third bracket being provided above the second workbench, a cylinder being provided on the top of the third bracket, a piston rod of the cylinder passing through the third bracket and a lower end of the piston rod being connected to a screen printing frame that can move up and down above the second conveyor belt, a screen printing base plate being provided at the bottom of the screen printing frame, at least two positioning posts being provided on the lower surface of the screen printing base plate, and positioning holes being provided on the loading plate that cooperate with the positioning posts, thereby realizing automatic operations of loading, transporting and tin powder coating, ensuring the position accuracy of the circuit boards during the operation, and improving the processing accuracy and efficiency.

[0014] 2. The screen printing device for electronic products of the present invention has a second slide installed on two opposite inner walls of the screen printing frame and above the screen printing base plate, each second slide is provided with a slider that can move back and forth in the second slide, a second motor is installed on a slider, one end of a mounting rod is connected to the output shaft of the second motor, and the other end of the mounting rod is rotatably connected to the other slider through a bearing, an inclined scraper is installed on the mounting rod and the lower end surface of the scraper contacts the upper surface of the screen printing base plate, and a feed port is provided on the screen printing frame, which can realize the adjustment of the inclination angle of the scraper to better adapt to various processing scenarios, and can also realize the flipping of the scraper so that the scraper can act on tin powder during the reciprocating motion of the slider, thereby improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attachment Figure 1 This is a schematic diagram of the overall structure of the screen printing device for electronic products of the present invention;

[0016] Attachment Figure 2 This is a structural cross-sectional view of a screen printing device for electronic products according to the present invention;

[0017] Attachment Figure 3 The present invention is attached Figure 2 A magnified view of point A;

[0018] Attachment Figure 4 The present invention is attached Figure 2 A side view of FIG.

[0019] Attachment Figure 5 It is a partial structural schematic diagram of the screen printing device for electronic products of the present invention.

[0020] In the above drawings: 1. First workbench; 2. Second workbench; 3. Connecting roller frame; 4. First conveyor belt; 5. Second conveyor belt; 6. Guide block group; 61. Guide block; 7. Bracket; 8. Cylinder; 9. Silk screen frame; 10. Silk screen base plate; 11. Guide plate; 12. Discharge pipe; 13. Valve; 14. Second chute; 15. Slider; 16. First motor; 17. Screw; 18. Second motor; 19. Scraper; 20. Positioning column; 21. Loading plate; 22. Positioning hole; 23. Guide chute; 24. Mounting rod; 25. Feed port. DETAILED DESCRIPTION

[0021] In the description of this patent, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, for example, to mean a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this patent in specific circumstances.

[0022] Embodiment 1: A screen printing device for electronic products, comprising a first workbench 1 equipped with a first conveyor belt 4, a second workbench 2 equipped with a second conveyor belt 5, a connecting roller frame 3 located between the first workbench 1 and the second workbench 2, and a carrier plate 21 for placing circuit boards, wherein the carrier plate 21 can be transported between the first conveyor belt 4, the connecting roller frame 3, and the second conveyor belt 5; a bracket 7 is provided above the second workbench 2, a cylinder 8 is installed on the top of the bracket 7, a piston rod of the cylinder 8 passes through the bracket 7, and the lower end of the piston rod is connected to a screen printing frame 9 that can move up and down above the second conveyor belt 5; a screen printing base plate 10 is installed at the bottom of the screen printing frame 9, at least two positioning posts 20 are provided on the lower surface of the screen printing base plate 10, and positioning holes 22 that cooperate with the positioning posts 20 are provided on the carrier plate 21;

[0023] A second slide 14 is installed on the two opposite inner walls of the silk-screen frame 9 and above the silk-screen base plate 10. Each of the second slides 14 is provided with a slider 15 that can move back and forth in the second slide 14. A second motor 18 is installed on one of the sliders 15. One end of a mounting rod 24 is connected to the output shaft of the second motor 18, and the other end of the mounting rod 24 is rotatably connected to another slider 15 through a bearing. An inclined scraper 19 is installed on the mounting rod 24 and the lower end surface of the scraper 19 contacts the upper surface of the silk-screen base plate 10. At least one slider 15 is connected to the driving mechanism. A feed port is provided on the silk-screen frame, and a number of evenly distributed discharge through holes are provided in the central area of the silk-screen base plate 10.

[0024] A material guide plate 11 is provided in the above-mentioned screen printing frame 9 and above the scraper 19. A concave area is formed on the above-mentioned material guide plate 11 and outside the screen printing base plate 10 having the discharge through-hole area. The concave area is provided with a plurality of discharge holes distributed at intervals. A discharge pipe 12 is connected to the bottom of each of the above-mentioned discharge holes, and a valve 13 is installed on the above-mentioned discharge pipe 12.

[0025] The first conveyor belt 4 and the second conveyor belt 5 are each provided with two guide block groups 6 arranged at intervals. Each of the guide block groups 6 is composed of a plurality of guide blocks 61 arranged in sequence along the forward direction of the loading plate 21. The lower surface of the loading plate 21 is provided with two guide grooves 23 for cooperating with the guide block group 6.

[0026] The front end of the guide chute 23 has a trumpet mouth that opens outwards.

[0027] Embodiment 2: A screen printing device for electronic products, comprising a first workbench 1 equipped with a first conveyor belt 4, a second workbench 2 equipped with a second conveyor belt 5, a connecting roller frame 3 located between the first workbench 1 and the second workbench 2, and a carrier plate 21 for placing circuit boards, wherein the carrier plate 21 can be transported between the first conveyor belt 4, the connecting roller frame 3, and the second conveyor belt 5; a bracket 7 is provided above the second workbench 2, a cylinder 8 is installed on the top of the bracket 7, a piston rod of the cylinder 8 passes through the bracket 7, and the lower end of the piston rod is connected to a screen printing frame 9 that can move up and down above the second conveyor belt 5; a screen printing base plate 10 is installed at the bottom of the screen printing frame 9, at least two positioning posts 20 are provided on the lower surface of the screen printing base plate 10, and positioning holes 22 cooperating with the positioning posts 20 are provided on the carrier plate 21;

[0028] A second slide 14 is installed on the two opposite inner walls of the silk-screen frame 9 and above the silk-screen base plate 10. Each of the second slides 14 is provided with a slider 15 that can move back and forth in the second slide 14. A second motor 18 is installed on one of the sliders 15. One end of a mounting rod 24 is connected to the output shaft of the second motor 18, and the other end of the mounting rod 24 is rotatably connected to another slider 15 through a bearing. An inclined scraper 19 is installed on the mounting rod 24 and the lower end surface of the scraper 19 contacts the upper surface of the silk-screen base plate 10. At least one slider 15 is connected to the driving mechanism. A feed port is provided on the silk-screen frame, and a number of evenly distributed discharge through holes are provided in the central area of the silk-screen base plate 10.

[0029] A material guide plate 11 is provided in the above-mentioned silk-screen frame 9 and above the scraper 19. A concave area is formed on the above-mentioned material guide plate 11 and outside the silk-screen base plate 10 having a discharge through-hole area. The concave area is provided with a number of discharge holes distributed at intervals. A discharge pipe 12 is connected below each of the above-mentioned discharge holes. A valve 13 is installed on the above-mentioned discharge pipe 12. The tin powder from the feed port falls onto the silk-screen base plate through the discharge pipe 12 on the material guide plate 11, which can not only ensure the uniformity of the distribution of the tin powder, but also avoid the waste caused by the disorderly falling of the tin powder and the erosion and damage to the components, thereby further improving the processing efficiency and precision.

[0030] The first conveyor belt 4 and the second conveyor belt 5 are each provided with two guide block groups 6 arranged at intervals. Each of the guide block groups 6 is composed of a plurality of guide blocks 61 arranged in sequence along the forward direction of the carrier plate 21. The lower surface of the carrier plate 21 is provided with two guide grooves 23 for cooperating with the guide block groups 6 to ensure the position accuracy of the carrier plate 21 during the entire process of material transportation and processing, avoid the circuit board thereon from being offset, and improve the processing accuracy.

[0031] The above-mentioned driving mechanism includes a first motor 16 installed at one end of the second slide groove 14 and a screw rod 17 at one end connected to the output end of the first motor 16. The other end of the above-mentioned screw rod 17 is rotatably connected to the other end of the second slide groove 14 through a bearing seat. The above-mentioned slider 15 is mounted on the screw rod 17 and is threadedly connected to the screw rod 17.

[0032] When the above-mentioned screen printing device for electronic products is used, the working principle is as follows: during operation, the carrier plate with the circuit board placed on it is placed on the carrier roller frame at one end of the first workbench, and the carrier plate is pushed to move to the first conveyor belt. The expansion opening at one end of the guide slide groove facilitates the guide block on the first conveyor belt to be embedded in the guide slide groove when the carrier plate moves, and the first conveyor belt can drive the carrier plate to move, and then the first conveyor belt moves the carrier plate to the connecting roller frame, and the carrier plate moves to the second workbench. The expansion opening at one end of the guide slide groove facilitates the guide slide groove of the carrier plate to cooperate with the guide block on the second conveyor belt, and the second conveyor belt is started to drive the carrier plate to move. When the carrier plate reaches the specified position, the second conveyor belt temporarily stops working, and the cylinder pushes the silk screen frame and the silk screen bottom plate to move until the silk screen is printed. The frame descends until the positioning column is inserted into the positioning hole so that the bottom surface of the silk-screen base plate is in close contact with the top surface of the circuit board. The valve at the discharge port opens, and the tin powder falls on the silk-screen base plate through the inclined surface of the guide plate. Then the valve is closed, and the second motor drives one side of the scraper to contact the top surface of the silk-screen base plate. Then the first electric motor 6 moves the slider and the second motor along the second slide groove through the screw rod, so that the scraper drives the tin powder to move and fall on the circuit board through the hole in the silk-screen base plate. When the scraper moves to the other end of the silk-screen base plate 10, the second motor rotates to make the second side of the scraper contact with the top surface of the silk-screen base plate. The first motor drives the scraper in the opposite direction through the screw rod to scrape the tin powder, so that the tin powder is sufficient for each solder joint on the circuit board. Finally, the cylinder contracts and resets, and the second conveyor belt is then started, and the second conveyor belt drives the carrier plate to move.

[0033] The machine comprises a first workbench equipped with a first conveyor belt, a second workbench equipped with a second conveyor belt, a connecting roller frame located between the first workbench and the second workbench, and a carrier plate for placing circuit boards, the carrier plate can be transported between the first conveyor belt, the connecting roller frame and the second conveyor belt, a third bracket is provided above the second workbench, a cylinder is provided on the top of the third bracket, a piston rod of the cylinder passes through the third bracket and the lower end of the piston rod is connected to a silk screen frame that can move up and down above the second conveyor belt, a silk screen base plate is provided at the bottom of the silk screen frame, at least two positioning posts are provided on the lower surface of the silk screen base plate, and positioning holes that cooperate with the positioning posts are provided on the carrier plate, so that in the process of silk screen printing on the circuit board, automatic operations of loading, transporting and tin powder coating are realized, and the position accuracy of the circuit board during the operation can be ensured to avoid offset, thereby improving the processing accuracy and efficiency;

[0034] In addition, a second slide is installed on the two inner walls opposite to each other and above the silk screen printing base plate, and each second slide is provided with a slider that can move back and forth in the second slide, and a second motor is installed on a slider, one end of a mounting rod is connected to the output shaft of the second motor, and the other end of the mounting rod is rotatably connected to the other slide through a bearing, an inclined scraper is installed on the mounting rod and the lower end face of the scraper contacts the upper surface of the silk screen printing base plate, at least one slider is connected to the driving mechanism, a feed port is provided on the silk screen printing frame, and a number of evenly distributed discharge through holes are provided in the central area of the silk screen printing base plate, which can be driven to rotate by the second motor, so that the inclination angle of the scraper can be adjusted to better adapt to various processing scenarios, and the scraper can be flipped so that it can act on tin powder during the reciprocating motion of the slider, thereby improving processing efficiency.

[0035] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A screen printing device for electronic products, comprising a first workbench (1) equipped with a first conveyor belt (4), a second workbench (2) equipped with a second conveyor belt (5), a connecting roller frame (3) located between the first workbench (1) and the second workbench (2), and a carrier plate (21) for placing circuit boards, wherein the carrier plate (21) can be transported between the first conveyor belt (4), the connecting roller frame (3) and the second conveyor belt (5), and characterized in that: A bracket (7) is provided above the second workbench (2), a cylinder (8) is installed on the top of the bracket (7), a piston rod of the cylinder (8) passes through the bracket (7) and the lower end of the piston rod is connected to a screen printing frame (9) that can move up and down above the second conveyor belt (5), a screen printing base plate (10) is installed at the bottom of the screen printing frame (9), at least two positioning columns (20) are provided on the lower surface of the screen printing base plate (10), and a positioning hole (22) that cooperates with the positioning columns (20) is provided on the loading plate (21); A second slide groove (14) is installed on the two opposite inner walls of the screen printing frame (9) and above the screen printing base plate (10), and a slider (15) that can move back and forth in the second slide groove (14) is provided in each of the second slide grooves (14). A second motor (18) is installed on one of the sliders (15), one end of a mounting rod (24) is connected to the output shaft of the second motor (18), and the other end of the mounting rod (24) is rotatably connected to another slider (15) through a bearing. An inclined scraper (19) is installed on the mounting rod (24) and the lower end surface of the scraper (19) contacts the upper surface of the screen printing base plate (10). At least one of the sliders (15) is connected to the driving mechanism. A feed port (25) is provided on the screen printing frame (9), and a plurality of evenly distributed discharge through holes are provided in the central area of the screen printing base plate (10); A material guide plate (11) is provided in the screen printing frame (9) and above the scraper (19); a concave area is formed on the material guide plate (11) and outside the screen printing base plate (10) having a discharge through hole area; a plurality of discharge holes are provided on the concave area, and a discharge pipe (12) is connected below each of the discharge holes; a valve (13) is installed on the feed port (25); two guide block groups (6) are provided on the first conveyor belt (4) and the second conveyor belt (5); each guide block group (6) is composed of a plurality of guide blocks (61) arranged in sequence along the forward direction of the carrier plate (21); and two guide slots (23) for cooperating with the guide block group (6) are provided on the lower surface of the carrier plate (21).

2. The screen printing device for electronic products according to claim 1, characterized in that: The driving mechanism comprises a first motor (16) mounted on one end of the second slide groove (14) and a screw rod (17) having one end connected to the output end of the first motor (16); the other end of the screw rod (17) is rotatably connected to the other end of the second slide groove (14) through a bearing seat; and the slider (15) is sleeved on the screw rod (17) and is threadedly connected to the screw rod (17).

3. The screen printing device for electronic products according to claim 1, characterized in that: The front end of the guide chute (23) has a trumpet mouth that opens outwards.

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