Screen printing equipment for circuit board printing

Abstract

The utility model relates to printing equipment, in particular to silk-screen printing equipment for circuit board printing. The silk-screen printing equipment for circuit board printing comprises a mounting frame, a connecting frame, an air cylinder and the like. Cylinders are mounted on the left and right sides of the front part of the mounting frame; and a connecting frame is fixedly arranged between movable rods of the cylinders. According to the utility model, the ink is intermittently output to the silk screen through the infusion pump, so that the problems that a large amount of ink is accumulated on the silk screen and exposed in the air during use, the ink is polluted by the outside due to long-time use, solvents in the ink are volatilized, part of the ink is solidified on the silk screen, the silk screen is blocked, and the silk screen effect is influenced are avoided.

Description

Technical Field

[0001] The utility model relates to a printing device, in particular to a screen printing device for printing a circuit board. Background Art

[0002] Silk screen printing is a common printing technology that uses a silk screen to print patterns, text or logos on a substrate. When processing circuit boards, silk screen printing is usually used to print important information such as circuit connection lines, component locations and numbers. The presence of silk screen printing can provide more information and facilitate the assembly and maintenance of circuit boards.

[0003] When screen printing circuit boards, printing ink and screen play a vital role in the printing effect. In traditional circuit board screen printing, in order to ensure the printing effect, workers usually pile up a large amount of ink on the screen to ensure that the scraper can smoothly squeeze the ink on the screen and apply it to the circuit board. However, a large amount of accumulated ink needs to be used for a long time. Ink exposed to the outside for a long time will inevitably absorb foreign pollutants. At the same time, the solvent in the accumulated ink will evaporate, resulting in impurities in the ink color. Part of the ink solidifies on the screen, causing the screen to be blocked, affecting the screen printing effect. Utility Model Content

[0004] In order to overcome the problem that a large amount of ink will be accumulated on the screen during use of traditional equipment, and to ensure that the scraper can smoothly squeeze the ink on the screen and apply it to the circuit board, however, a large amount of accumulated ink needs to be used for a long time, and the ink exposed to the outside for a long time will inevitably absorb foreign pollutants, and at the same time, the solvent in the accumulated ink will evaporate, resulting in impurities in the ink color, and part of the ink will solidify on the screen, causing the screen to be blocked, affecting the screen printing effect. The purpose of the utility model is to provide a screen printing device for circuit board printing that can quantitatively discharge ink on the screen according to the needs of use, so as to avoid the ink being exposed to the outside for a long time, being contaminated and volatilized and dried to block the screen.

[0005] The technical scheme of the utility model is: a screen printing device for circuit board printing, including a mounting frame, a connecting frame, a cylinder, a transmission group, a printing plate, a slide plate, an ink cartridge, a guide rod, a connecting plate, a liquid pump, an oil pipe, a connecting block, a scraper, an electric cylinder and a gear group, cylinders are installed on the left and right sides of the front of the mounting frame, a connecting frame is fixedly provided between the movable rods of the cylinders, the connecting frame is slidably connected to the mounting frame through the movable rods of the cylinders, a printing plate is slidably provided at the lower part of the connecting frame, the printing plate is composed of a frame and a screen, a transmission group is installed on the mounting frame, the transmission group is composed of a lead screw and a transmission motor, the output shaft of the transmission motor is fixedly connected to the lead screw, and the lead screw of the transmission group is fixedly connected to the output shaft of the transmission motor. A slide plate is threadedly connected to the rod, the slide plate is in sliding contact with the mounting frame, an ink cartridge is fixedly installed on the top of the slide plate, a guide rod is slidably provided at the front of the slide plate, a connecting plate is slidably provided on the upper part of the connecting frame, the connecting plate is fixedly connected to the bottom of the guide rod, a liquid pump is installed at the rear of the connecting plate, the pipeline at the input end of the liquid pump is connected and communicated with the ink cartridge, the lower part of the pipeline at the output end of the liquid pump is connected and communicated with an oil pipe, a connecting block is fixedly connected to the right side of the front of the connecting plate, a rotatable scraper is located at the lower part of the connecting block, an electric cylinder is installed on the connecting plate, the movable rod of the electric cylinder is connected to the scraper through a gear set, the gear set is connected by a gear and a rack, and the rack and the gear are meshed with each other.

[0006] As a preferred technical solution of the utility model, it also includes a metering pump, a liquid tank and a liquid inlet pipe. The metering pump is fixedly installed on the left front side of the top of the slide board, and the liquid tank is fixedly connected to the front side of the slide board near the metering pump. The input end of the metering pump is connected and communicated with the lower left part of the liquid tank through a pipeline, and the output end of the metering pump is connected and communicated with the upper left part of the ink cartridge through the liquid inlet pipe.

[0007] As a preferred technical solution of the utility model, it also includes a swing block, an I-block and a stirring block. A guide groove is opened on the upper part of the ink cartridge, and an I-block is slidably arranged in the guide groove. The upper part of the I-block is fixedly connected to the swing block through a connecting rod, and the lower part of the I-block is fixedly connected to the stirring block through a connecting rod.

[0008] As a preferred technical solution of the utility model, it also includes a card block and a spring. A card block is slidably provided at the lower right part of the connecting frame, a spring is wound around the outer right part of the card block, two ends of the spring are respectively connected to the card block and the connecting frame, and a rear side of the card block is in sliding contact with the right front side of the printing plate frame.

[0009] As a preferred technical solution of the utility model, it also includes a protective cover, and the protective cover is fixedly installed on the connecting frame.

[0010] Compared with the prior art, the utility model has the following advantages: the utility model intermittently outputs ink to the silk screen through a liquid suction pump, thereby avoiding the accumulation of a large amount of ink on the silk screen and exposure to the air during use, which causes the ink to be contaminated by the outside world due to long-term use. At the same time, the solvent in the ink evaporates and part of the ink solidifies on the silk screen, causing the silk screen to be blocked and affecting the silk screen printing effect.

[0011] The utility model drives the I-shaped block to move left or right through the swing block, thereby driving the stirring block to move in the ink cartridge, stirring the liquid in the ink cartridge to ensure that the pigment in the ink is evenly dispersed to obtain a coating with consistent color, and can also increase the viscosity and fluidity during the painting process, making the ink easier to apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model without the protective cover.

[0014] Figure 3 It is an enlarged view of point A of the present utility model.

[0015] Figure 4 It is a cross-sectional view of the brushing mechanism and ink outlet mechanism of the utility model.

[0016] Figure 5 The three-dimensional structure diagram of the metering pump, liquid tank and liquid inlet pipe of the utility model

[0017] Figure 6 This is a disassembled diagram of the ink cartridge and the stirring assembly of the utility model.

[0018] The meanings of the reference numerals in the figure are: 1. mounting frame, 2. connecting frame, 21. cylinder, 22. transmission group, 3. printing plate, 31. block, 32. spring, 33. slide plate, 4. ink cartridge, 41. guide rod, 42. guide groove, 5. connecting plate, 6. liquid pump, 61. oil pipe, 7. connecting block, 71. scraper, 8. electric cylinder, 9. gear set, 10. metering pump, 11. liquid tank, 12. liquid inlet pipe, 13. swing block, 14. I-block, 15. stirring block, 16. protective cover. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Embodiment 1: A screen printing device for printing circuit boards, such as Figure 1-6 As shown, it includes a mounting frame 1, a connecting frame 2, a cylinder 21, a transmission group 22, a printing plate 3, a slide plate 33, an ink cartridge 4, a guide rod 41, a connecting plate 5, a liquid pump 6, an oil pipe 61, a connecting block 7, a scraper 71, an electric cylinder 8 and a gear group 9. When the equipment is installed, the equipment can be suspended at a high place through the mounting frame 1. Cylinders 21 are installed on both sides of the front of the mounting frame 1. A connecting frame 2 is fixed between the movable rods of the cylinders 21. The connecting frame 2 is slidably connected to the mounting frame 1 through the movable rods of the cylinders 21. When the two cylinders 21 are working, they will move at the same time, and the cylinders The movable rods 21 extend at equal distances. A printing plate 3 is slidably arranged at the lower part of the connecting frame 2. The printing plate 3 is composed of a frame and a screen. When printing, the cylinder 21 drives the printing plate 3 on the connecting frame 2 to move downward and contact the circuit board. The two are close to each other. A transmission group 22 is installed on the mounting frame 1. The transmission group 22 is composed of a screw rod and a transmission motor. The output shaft of the transmission motor is fixedly connected to the screw rod. A slide plate 33 is threadedly connected to the screw rod of the transmission group 22. The slide plate 33 is in sliding contact with the mounting frame 1. The transmission group 22 drives the slide plate 33 to move left and right on the mounting frame. The slide plate 33 is movable, and an ink cartridge 4 is fixedly installed on the top of the slide plate 33. A guide rod 41 is slidably provided at the front of the slide plate 33. A connecting plate 5 is slidably provided on the upper part of the connecting frame 2. The connecting plate 5 is fixedly connected to the bottom of the guide rod 41. The connecting plate 5 can move left and right on the connecting frame 2. When the connecting frame 2 moves downward, the guide rod 41 will slide in the slide plate 33. A liquid pump 6 is installed at the rear of the connecting plate 5. The pipeline at the input end of the liquid pump 6 is connected and communicated with the ink cartridge 4. The lower part of the pipeline at the output end of the liquid pump 6 is connected and communicated with an oil pipe 61. A plurality of leakage holes are evenly opened at the lower part of the oil pipe 61. The liquid pump can pump the oil The ink in the ink cartridge flows onto the silk screen in the printing plate 3 through the oil pipe. A connecting block 7 is fixedly connected to the right front part of the connecting plate 5. A rotating scraper 71 is located at the lower part of the connecting block 7. The surface of the scraper 71 is relatively fine. When it contacts the silk screen, the ink can be evenly applied to the silk screen. An electric cylinder 8 is installed on the connecting plate 5. The movable rod of the electric cylinder 8 is connected to the scraper 71 through a gear set 9. The gear set 9 is connected by a gear and a rack. The rack and the gear are meshed with each other. The movable rod of the electric cylinder 8 can drive the scraper to rotate upward or upward through the gear set 9, so as to achieve separation and contact with the silk screen on the printing plate 3.

[0021] Initially, the slide plate 33 is located at the right position of the transmission group 22, the movable rods of the air cylinder 21 and the electric cylinder 8 are in a retracted state, and the scraper 71 is not in contact with the printing plate 3. When the circuit board needs to be screen-printed by the device, first add a proper amount of ink to the ink cartridge 4, then start the liquid pump 6 to extract the ink in the ink cartridge 4 and let it flow onto the screen of the printing plate 3 through the oil pipe 61, then control the slide plate 33 to move to the right for a certain distance so that the outflowing ink is located below the scraper 71, then control the movable rod of the electric cylinder 8 to extend a certain distance, and when the scraper 71 is right When the ink on the screen is in contact with the screen, the electric cylinder 8 is controlled to stop, and then the transmission group 22 is started to drive the slide plate 33 to move to the left, and the slide plate 33 drives the various components on the connecting plate 5 to move left and right, and the ink on the screen is wiped off by the scraper 71, and the scraper 71 evenly smears the ink on the screen of the printing plate 3 through the multiple left and right movements of the slide plate 33. After the ink is evenly smeared, the scraper 71 will move to the right side of the screen, and the scraper 71 will be out of contact with the screen, and then the circuit board is placed directly below the printing plate 3 through the fixing device, and then the cylinder is controlled 21 extends the movable rod downward, driving the connecting frame 2 and the connecting plate 5 to move downward, and the guide rod 41 slides downward on the slide plate 33. When the movable rod of the cylinder 21 is fully extended, the lower side of the printing plate 3 will contact the upper side of the circuit board to be screen-printed, and they will be close to each other. Then, the control electric cylinder 8 extends the movable rod, pushes the rack, drives the gear to rotate downward, so that the scraper 71 contacts the screen, and then starts the transmission group 22 to drive the slide plate 33 and the connecting plate 5 to move to the left, squeeze the screen through the scraper 71, and apply ink on the circuit board. After the application is completed, the cylinder 2 1 The movable rod drives the connecting frame 2 and the connecting plate 5 to move upward. During this process, the electric cylinder 8 will retract and drive the scraper 71 to break contact with the screen. Then the transmission group 22 will drive the slide plate 33 to reset to the right, completing the screen printing work and taking away the circuit board. During screen printing, the ink is intermittently output to the screen through the liquid pump 6 to avoid a large amount of ink accumulating on the screen and being exposed to the air during use. Long-term use will cause the ink to be contaminated by the outside world. At the same time, the solvent in the ink will evaporate, and part of the ink will solidify on the screen, causing the screen to be blocked and affecting the screen printing effect.

[0022] Embodiment 2: Based on embodiment 1, Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, it also includes a metering pump 10, a liquid tank 11 and a liquid inlet pipe 12. The metering pump 10 that can quantitatively extract liquid is fixedly installed on the left front side of the top of the slide plate 33. The front part of the slide plate 33 is fixedly connected to the liquid tank 11 near the metering pump 10. The liquid tank contains a liquid for diluting the ink solvent. The input end of the metering pump 10 is connected and communicated with the lower left part of the liquid tank 11 through a pipeline, and the output end of the metering pump 10 is connected and communicated with the upper left part of the ink cartridge 4 through the liquid inlet pipe 12. The liquid in the liquid tank 11 can be pumped into the ink cartridge 4 through the metering pump 10.

[0023] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, it also includes a swing block 13, an I-block 14 and a stirring block 15. A guide groove 42 is opened on the upper part of the ink cartridge 4, and an I-block 14 is slidably arranged in the guide groove 42. When the I-block moves to the leftmost or rightmost end of the groove, the upper and lower strips of the I-block will cover the opening of the guide groove. The upper part of the I-block 14 is fixedly connected to the swing block 13 through a connecting rod, and the lower part of the I-block 14 is fixedly connected to the stirring block 15 through a connecting rod. When the slide 3 moves left and right, the swing block 13 will drive the I-block 14 to move left or right in the guide groove, and the I-block 14 will drive the stirring block 15 to move in the ink cartridge 4 to stir the liquid in the ink cartridge 4.

[0024] like Figure 1-3 As shown, it also includes a clamping block 31 and a spring 32. The clamping block 31 is slidably provided at the lower right part of the connecting frame 2. The spring 32 is wound around the outer side of the right part of the clamping block 31. The two ends of the spring 32 are respectively connected to the clamping block 31 and the connecting frame 2. The rear side of the clamping block 31 is in sliding contact with the right part of the front side of the frame of the printing plate 3 to prevent the printing plate from sliding under force. The spring 32 will maintain the force of the clamping block 31 to clamp the printing plate to the left to prevent the clamping block 31 from being displaced under force and separated from the printing plate 3.

[0025] like Figure 1 As shown, a protective cover 16 is also included. The protective cover 16 is fixedly installed on the connecting frame 2. The protective cover can effectively isolate external dirt, protect the equipment components, and greatly reduce the number of impurities dropped into the printing plate 3.

[0026] When the printed board 3 needs to be replaced, the block 31 is slid to the right, the spring 32 is compressed, and the block 31 is disengaged from the printed board 3. Then, the printed board 3 is pulled forward in the connecting frame 2. After the replacement is completed, the block 31 is released. Under the action of the spring 32, the block 31 is forced to move to the left to clamp the replaced printed board 3, which is convenient for replacement and prevents the printed board 3 from being displaced by force. When the circuit board is screen-printed, the solvent in the liquid tank 11 can be quantitatively input into the ink cartridge 4 through the metering pump 10 and the liquid inlet pipe 12 according to the pattern printed by the screen printing, and the ink is prepared. The viscosity of the ink in the ink cartridge 4. At the same time, when the ink cartridge 4 moves to the left or right, under the action of inertia, the swing block 13 will drive the I-block 14 to move left or right in the guide groove, and the I-block 14 will drive the stirring block 15 to move in the ink cartridge 4, stirring the liquid in the ink cartridge 4 to ensure that the pigment in the ink is evenly dispersed to obtain a coating with consistent color. It can also increase the viscosity and fluidity during the brushing process, making the ink easier to apply. The protective cover 16 on the outside of the silk screen can also effectively prevent foreign objects from falling onto the silk screen on the printing plate 3, reducing ink pollution.

[0027] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A screen printing device for printing a circuit board, comprising a mounting frame (1), a connecting frame (2), a cylinder (21), a transmission group (22) and a printing plate (3), wherein the cylinder (21) is installed on both sides of the front of the mounting frame (1), the connecting frame (2) is fixedly provided between the movable rods of the cylinder (21), the connecting frame (2) is slidably connected to the mounting frame (1) through the movable rod of the cylinder (21), the printing plate (3) is slidably provided at the lower part of the connecting frame (2), the printing plate (3) is composed of a frame and a screen, the transmission group (22) is installed on the mounting frame (1), the transmission group (22) is composed of a screw rod and a transmission motor, and the output shaft of the transmission motor is fixedly connected to the screw rod; Features: The invention also comprises a slide plate (33), an ink cartridge (4), a guide rod (41), a connecting plate (5), a liquid pump (6), an oil pipe (61), a connecting block (7), a scraper (71), an electric cylinder (8) and a gear set (9). The slide plate (33) is connected to the screw rod of the transmission set (22) by a threaded connection. The slide plate (33) is in sliding contact with the mounting frame (1). The ink cartridge (4) is fixedly mounted on the top of the slide plate (33). The front part of the slide plate (33) is slidably provided with a guide rod (41). The upper part of the connecting frame (2) is slidably provided with a connecting plate (5). The connecting plate (5) is in sliding contact with the guide rod (41). 1) The bottom is fixedly connected, a liquid pump (6) is installed at the rear of the connecting plate (5), the pipeline at the input end of the liquid pump (6) is connected and communicated with the ink cartridge (4), the lower part of the pipeline at the output end of the liquid pump (6) is connected and communicated with an oil pipe (61), a connecting block (7) is fixedly connected to the right side of the front of the connecting plate (5), a rotating scraper (71) is installed at the lower part of the connecting block (7), an electric cylinder (8) is installed on the connecting plate (5), a movable rod of the electric cylinder (8) and the scraper (71) are connected through a gear set (9), the gear set (9) is connected by a gear and a rack, and the rack and the gear are meshed with each other.

2. A screen printing device for circuit board printing as claimed in claim 1, characterized in that: The invention also comprises a metering pump (10), a liquid tank (11) and a liquid inlet pipe (12); the metering pump (10) is fixedly mounted on the left front side of the top of the slide plate (33); the liquid tank (11) is fixedly connected to the front side of the slide plate (33) close to the metering pump (10); the input end of the metering pump (10) is connected and communicated with the left lower part of the liquid tank (11) through a pipeline; the output end of the metering pump (10) is connected and communicated with the left upper part of the ink cartridge (4) through the liquid inlet pipe (12).

3. A screen printing device for circuit board printing as claimed in claim 2, characterized in that: The ink cartridge (4) further comprises a swing block (13), an I-shaped block (14) and a stirring block (15); a guide groove (42) is provided on the upper part of the ink cartridge (4); an I-shaped block (14) is slidably arranged in the guide groove (42); the upper part of the I-shaped block (14) is fixedly connected to the swing block (13) via a connecting rod; the lower part of the I-shaped block (14) is fixedly connected to the stirring block (15) via a connecting rod.

4. A screen printing device for circuit board printing as claimed in claim 3, characterized in that: The device also comprises a clamping block (31) and a spring (32). The clamping block (31) is slidably arranged at the lower right part of the connecting frame (2). The spring (32) is wound around the outer right part of the clamping block (31). The two ends of the spring (32) are respectively connected to the clamping block (31) and the connecting frame (2). The rear side of the clamping block (31) is in sliding contact with the right part of the front side of the frame of the printing plate (3).

5. A screen printing device for circuit board printing as claimed in claim 4, characterized in that: It also includes a protective cover (16), and the protective cover (16) is fixedly mounted on the connecting frame (2).

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