A circuit board screen printing device and screen printing process

Abstract

The present invention relates to the field of screen printing technology, and in particular to a circuit board screen printing device and a screen printing process. A circuit board screen printing device and a screen printing process, including a screen printing body, a mounting plate, a fixture, a screen and an ink scraping assembly, etc.; a mounting plate is installed on the rear of the screen printing body through an electric drive rail; a plurality of fixtures are connected to the mounting plate; a screen is installed on the plurality of fixtures; an ink scraping assembly for scraping ink on the mounting plate; the mounting plate, the fixture, the screen and the ink scraping assembly are driven up and down by the electric drive rail. By setting the maximum travel position of the scraper and the ink return knife to be located above the intercepting surfaces on the left and right sides respectively, the movement of the ink is intercepted, limited and guided by the intercepting surface, and the scraper and the ink return knife subsequently scrape the ink along the intercepting surface. During the printing process and the ink return process, it is ensured that the ink is always located on the working area, avoiding the problem of ink moving outside the working area due to the push of the scraper and the ink return knife, causing waste.

Description

Technical Field

[0001] The present invention relates to the field of screen printing technology, and in particular to a circuit board screen printing device and a screen printing process. Background Art

[0002] Existing circuit board screen printers are usually equipped with scrapers and ink return knives for uniform coating and embossing of ink. During operation, in the initial state, the scraper and ink return knife are both located on the left side of the screen and fit with the screen. First, a sufficient amount of ink is poured between the scraper and the ink return knife. At this time, the area between the scraper and the ink return knife is the ink accumulation area. Then, the two are controlled to move to the right synchronously, and the ink return knife is responsible for pushing the ink to evenly cover the screen. After reaching the right side, lift the ink return knife, and then move the two to the left synchronously. At this time, the scraper completes the ink embossing work on the circuit board. After that, replace the circuit board to be printed, lift the scraper, lower the ink return knife, control the scraper and the ink return knife to move to the right synchronously, and push the ink again through the ink return knife to evenly cover the screen, and then repeat the above steps to achieve continuous printing. Although this process prevents the ink coated or residual on the screen from being pushed out of the ink accumulation area between the scraper and the ink return knife by alternately lifting the scraper or the ink return knife, thereby improving the ink use efficiency and reducing the ink replenishment frequency, there are still problems in actual operation. When the scraper is lifted, the ink return knife may push part of the ink out of the ink accumulation area between the two. Similarly, when the ink return knife is lifted, the scraper may also cause a similar situation, resulting in part of the ink not being fully utilized, causing waste. Summary of the invention

[0003] In order to overcome the disadvantage of existing circuit board screen printing machines that, during operation, ink is pushed out of the accumulation area when the scraper or the ink return knife is alternately lifted, resulting in insufficient utilization of the ink and resulting in waste, the present invention provides a circuit board screen printing device and a screen printing process.

[0004] The technical solution is: a circuit board screen printing equipment, including a screen printing body, a mounting plate, a fixture, a screen and an ink scraper assembly; a mounting plate is installed on the rear of the screen printing body through an electric drive guide rail; a number of fixtures are connected to the mounting plate; a screen is installed on a number of fixtures together; a scraper assembly is connected to the front side of the mounting plate; the mounting plate, the fixture, the screen and the ink scraper assembly are driven to rise and fall through the electric drive guide rail; it also includes a first connecting plate, a limit plate and a driving assembly; the mounting plate is connected to the driving assembly; the driving assembly is connected to a number of first connecting plates; each first connecting plate is connected to a limit plate for limiting the movement of ink on the lower side, and the lower side of the limit plate is in contact with the screen; inclined intercepting surfaces are arranged on the opposite sides of the limit plates; each limit plate is provided with an arc-shaped guide portion, which is tangent to the screen; the first connecting plate and the limit plate are driven to move left and right through the driving assembly.

[0005] Furthermore, the ink scraping assembly includes a second connecting plate, a scraper, an ink return knife, a first slide rail, a first electric slide, a first driving member and a second driving member; the first slide rail is fixedly connected to the mounting plate; the first electric slide is slidably connected to the first slide rail; the second connecting plate is fixedly connected to the first electric slide; the first driving member is installed on the second connecting plate; the driving end of the first driving member is fixedly connected to a scraper for embossing; the second driving member is installed on the second connecting plate; the driving end of the second driving member is fixedly connected to an ink return knife for coating ink.

[0006] Furthermore, the lower parts of the scraper and the ink return knife are both made of elastic material.

[0007] Furthermore, it also includes a nozzle; a cavity is opened in each first connecting plate, and the cavity is connected to an external water supply device through a connecting pipe; each first connecting plate is fixedly connected and connected to a plurality of nozzles on one side away from the clamp, and each nozzle is connected to the cavity of the first connecting plate.

[0008] Furthermore, the nozzle outlet is arranged toward the intercepting surface.

[0009] Furthermore, it also includes a third driving member; each limit plate is configured to be slidably connected to the corresponding first connecting plate; a third driving member is fixedly connected to each first connecting plate; the driving end of the third driving member is fixedly connected to the corresponding limit plate; the limit plate is driven to rise and fall by the third driving member.

[0010] Furthermore, the guide portion is configured to be made of a soft elastic material, and the guide portion is configured to be detachably connected to the limiting plate.

[0011] Furthermore, the portion of the lower side of the limiting plate that contacts the wire mesh is made of a soft elastic material.

[0012] Furthermore, it also includes a fourth driving member and a slide plate; a sewage discharge chamber for discharging clean sewage is opened on the platform of the silk screen printing body; the sewage discharge chamber is connected to a sewage discharge pipe; a slide plate is slidably connected to the sewage discharge chamber; fourth driving members are installed on both sides of the sewage discharge chamber; the driving ends of all fourth driving members are fixedly connected to the slide plate; and the slide plate is driven to slide by the fourth driving member.

[0013] Furthermore, a circuit board screen printing process includes the following steps:

[0014] S1: Loading, placing the circuit board on the platform of the screen printing machine, aligning it with the screen printing area, and then controlling the screen to fit the surface of the circuit board and adding sufficient ink;

[0015] S2: Screen printing, controlling the scraper and ink return knife to push the ink through the screen printing area to achieve screen printing on the circuit board;

[0016] S3: Maintenance: After the screen printing work is completed, the screen, scraper and ink return knife are scraped by driving the limit plate, and clean water is sprayed through the nozzle for cleaning;

[0017] S4: Inspection: After the cleaning and maintenance is completed, check the status of the equipment to ensure that the silk screen printing work can run normally the next day.

[0018] The beneficial effects of the present invention are as follows: by setting the maximum travel position of the scraper and the ink return knife to be located above the interception surfaces on the left and right sides respectively, the movement of the ink is intercepted, limited and guided by the interception surfaces, and the scraper and the ink return knife subsequently scrape the ink along the interception surfaces, ensuring that the ink is always located on the working area during the stamping process and the ink return process, avoiding the problem of ink moving out of the working area and causing waste due to the push of the scraper and the ink return knife;

[0019] The limit plate is used to scrape the screen, scraper and ink return knife respectively, and the nozzle sprays clean water for flushing, so that the equipment can be easily cleaned without removing the screen, reducing the difficulty of daily maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the circuit board screen printing equipment of the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the ink scraping assembly, the first connecting plate, the limiting plate and the nozzle assembly of the present invention;

[0022] Figure 3 It is a schematic diagram of the combined three-dimensional structure of the clamp, screen and limit plate of the present invention;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the fourth driving member and the slide plate combination of the present invention.

[0024] Figure numbers: 1-screen printing body, 1001-drain chamber, 2-mounting plate, 3-clamp, 4-screen, 4001-screen frame, 4002-screen printing area, 5-second connecting plate, 6-scraper, 7-ink return knife, 8-first connecting plate, 9-limiting plate, 9001-interception surface, 9002-guide part, 10-nozzle, 101-first slide rail, 102-first electric slide, 103-first driving member, 104-second driving member, 105-second slide rail, 106-second electric slide, 107-third driving member, 201-fourth driving member, 202-slide plate. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] Example 1

[0027] A circuit board screen printing device, such as Figure 1-Figure 3 As shown, the screen printing machine body 1, the mounting plate 2, the fixture 3, the screen 4 and the ink scraping assembly are included; the mounting plate 2 is mounted on the rear of the screen printing machine body 1 through an electric drive rail; the front side of the mounting plate 2 is connected to two left-right symmetrical fixtures 3; the screen 4 is mounted on the two fixtures 3; the front side of the mounting plate 2 is connected to the ink scraping assembly; the mounting plate 2, the fixture 3, the screen 4 and the ink scraping assembly are driven to rise and fall through the electric drive rail;

[0028] It also includes a first connecting plate 8, a limiting plate 9 and a driving component; the driving component is connected to the front side of the mounting plate 2; the driving component is connected to two left-right symmetrical first connecting plates 8; the lower side of each first connecting plate 8 is connected to a limiting plate 9, and the lower side of the limiting plate 9 is in contact with the screen 4; the two limiting plates 9 are provided with inclined intercepting surfaces 9001 on the opposite sides, and the ink is intercepted by the intercepting surfaces 9001 to achieve movement limitation of the ink; each limiting plate 9 is provided with an arc-shaped guiding part 9002, and the guiding part 9002 is tangent to the screen 4; the first connecting plate 8 and the limiting plate 9 are driven to move left and right by the driving component.

[0029] The ink scraping assembly includes a second connecting plate 5, a scraper 6, an ink return knife 7, a first slide rail 101, a first electric slide 102, a first driving member 103 and a second driving member 104; the first slide rail 101 is bolted to the front side of the mounting plate 2; the first electric slide 102 is slidably connected to the first slide rail 101; the second connecting plate 5 is fixedly connected to the first electric slide 102; the first driving member 103 is installed on the second connecting plate 5, and the first driving member 103 is an electric push rod; the scraper 6 is fixedly connected to the driving end of the first driving member 103; the second driving member 104 is installed on the second connecting plate 5, and the second driving member 104 is an electric push rod; the ink return knife 7 is fixedly connected to the driving end of the second driving member 104; the ink return knife 7 is located on the left side of the scraper 6.

[0030] Furthermore, in order to prevent the screen 4 from being damaged due to squeezing, the lower parts of the scraper 6 and the ink return knife 7 are made of elastic material.

[0031] The driving assembly includes a second slide rail 105 and a second electric slide 106; the second slide rail 105 is bolted to the front side of the mounting plate 2; two second electric slides 106 are slidably connected to the second slide rail 105; each second electric slide 106 is fixedly connected to the corresponding first connecting plate 8.

[0032] Initially, the scraper 6 and the ink return knife 7 are both located on the left side of the screen 4 and are in contact with the screen 4. The left side of the scraper 6, the right side of the ink return knife 7 and the screen frame 4001 of the screen 4 form an ink accumulation area. Pour enough ink into the ink accumulation area to complete the preparation work before screen printing.

[0033] During the screen printing process of the circuit board, the circuit board is first placed on the platform of the screen printing body 1, so that the circuit board is aligned with the screen printing area 4002, and then the electric control guide rail is controlled to drive the mounting plate 2 to slide downward on the screen printing body 1, so that the clamp 3 and the screen 4 move downward until the screen 4 is in contact with the circuit board, and then the first electric slide 102 is controlled to drive the second connecting plate 5, the scraper 6 and the ink return knife 7 to slide synchronously to the right along the first slide rail 101, that is, the scraper 6 and the ink return knife 7 drive the accumulated ink on the screen 4 to move to the right. In this process, the ink is pushed by the ink return knife 7 to evenly cover the screen 4. When the scraper 6 and the ink return knife 7 move to the right part of the screen 4, the ink in the screen printing area 4002 is evenly coated. Then the control The second driving member 104 is controlled to lift the ink return knife 7 upward to separate it from the upper side of the screen 4, and then the first electric slide 102 is controlled to drive the scraper 6 and the ink return knife 7 to move left synchronously until the ink return knife 7 moves to above the limiting plate 9 on the left. More precisely, the ink return knife 7 is located above the intercepting surface 9001, and the scraper 6 is still in contact with the screen 4. The ink is intercepted and limited by the intercepting surface 9001, so that the ink dripping from the ink return knife 7 and the ink pushed to the intercepting surface 9001 by the scraper 6 flow to the side close to the scraper 6 under the inclined guidance of the intercepting surface 9001. In this process, the ink on the screen 4 is scraped to the left by the scraper 6, and the circuit board below the screen printing area 4002 is embossed.

[0034] After completing the silk screen printing work on the circuit board once, the electric control guide rail is controlled to drive the clamp 3 and the silk screen 4 to move upward on the silk screen printing body 1, and then according to the silk screen printing requirements of the circuit board, the next circuit board is selected for silk screen printing, or the current circuit board is turned over and the back side is silk screen printed. The clamp 3 and the silk screen 4 are controlled to move downward on the silk screen printing body 1 so that the silk screen 4 fits the circuit board, and prepares for the second silk screen printing work.

[0035] Before the secondary silk-screen printing work, it is necessary to use the ink return knife 7 to evenly apply the accumulated ink to the silk-screen printing area 4002. At this time, the scraper 6 and the ink return knife 7 are both located on the left side of the silk screen 4, and the ink return knife 7 is located above the intercepting surface 9001. First, the first driving member 103 is controlled to drive the scraper 6 to lift, so that the scraper 6 is separated from the upper side of the silk screen 4, and the second driving member 104 is controlled to drive the ink return knife 7 to descend, so that the lower end of the ink return knife 7 is in contact with the intercepting surface 9001, and then the scraper 6 and the ink return knife 7 are controlled to move to the right, and the second driving member 104 is synchronously controlled to drive the ink return knife 7 to descend, so that the ink return knife 7 always maintains a state of being in contact with the limit plate 9 during the movement to the right. Until the ink return knife 7 is in contact with the silk screen 4, the second driving member 104 is controlled to stop to prevent the ink return knife 7 from excessively descending and damaging the silk screen 4. During the process, the ink return knife 7 moves to the right along the intercepting surface 9001 and the guide part 9002 in a fitted state, and the ink on the intercepting surface 9001 and the guide part 9002 is fully scraped to the right to avoid ink residue on the limit plate 9. Then the scraper 6 and the ink return knife 7 continue to move to the right until the scraper 6 moves above the limit plate 9 on the right. More precisely, the scraper 6 is located above the intercepting surface 9001, and the ink return knife 7 is still in contact with the screen 4. The same principle as above is used to intercept and guide the ink through the intercepting surface 9001. In this process, the ink on the screen 4 is pushed to the right by the ink return knife 7 to apply ink to the screen printing area 4002, and then the same operation mode as the first screen printing is repeated to perform the second screen printing work. In this way, the batch screen printing work of the circuit boards is completed.

[0036] Taking into account that the silk-screening areas of circuit boards of different specifications are not the same, a second slide rail 105 and a second electric slide 106 are installed on the mounting plate 2. The second electric slide 106 drives the first connecting plate 8 and the limit plate 9 to move left and right, thereby adjusting the size of the working area of ​​the silk screen 4, so that the moving stroke of the scraper 6 and the ink return knife 7 matches the silk-screening area of ​​the circuit board, reducing the idle running of the scraper 6 and the ink return knife 7, and improving the silk-screen work efficiency.

[0037] According to the above work, the present invention has the following advantages:

[0038] By setting the maximum travel positions of the scraper 6 and the ink return knife 7 to be located above the intercepting surfaces 9001 on the left and right sides respectively, the movement of the ink is intercepted, limited and guided by the intercepting surfaces 9001. Subsequently, the scraper 6 and the ink return knife 7 scrape the ink along the intercepting surfaces 9001. During the printing process and the ink return process, the ink is always located in the working area, avoiding the problem of ink moving out of the working area and causing waste due to the push of the scraper 6 and the ink return knife 7.

[0039] In addition, the present invention also has the following advantages:

[0040] By providing an arc-shaped guide portion 9002 on the limiting plate 9 and making the guide portion 9002 tangent to the screen 4, a height difference between the limiting plate 9 and the screen 4 is avoided, so that the ink on the intercepting surface 9001 is fully scraped off, thereby improving the utilization rate of the ink.

[0041] Example 2

[0042] On the basis of Example 1, Figure 2 and Figure 4 As shown, a nozzle 10 is also included; a cavity is opened in each first connecting plate 8, and the cavity is connected to an external water supply device through a connecting pipe; each first connecting plate 8 is fixedly connected and connected to at least three nozzles 10 on one side away from the clamp 3, and each nozzle 10 is connected to the cavity of the first connecting plate 8.

[0043] Furthermore, in order to improve the cleaning effect on the limiting plate 9, the nozzle of the nozzle 10 is arranged toward the intercepting surface 9001.

[0044] It also includes a third driving member 107; each limit plate 9 is configured to be slidably connected to the corresponding first connecting plate 8; a third driving member 107 is fixedly connected to each first connecting plate 8, and the third driving member 107 is an electric push rod; the driving end of the third driving member 107 is fixedly connected to the corresponding limit plate 9; the limit plate 9 is driven to rise and fall by the third driving member 107.

[0045] Furthermore, in order to improve the cleaning effect of the scraper 6 and the ink return knife 7, the guide part 9002 is set to be made of rubber material, and the guide part 9002 is set to be plugged into the limiting plate 9.

[0046] Furthermore, in order to improve the cleaning effect of the screen 4, the portion of the lower side of the limiting plate 9 that contacts the screen 4 is made of rubber material.

[0047] It also includes a fourth driving member 201 and a slide plate 202; a sewage chamber 1001 is opened on the platform of the screen printing machine body 1; a sewage pipe is connected to the rear side of the sewage chamber 1001; a slide plate 202 is slidably connected to the sewage chamber 1001; fourth driving members 201 are installed on the left and right sides of the sewage chamber 1001, and the fourth driving member 201 is an electric push rod; the driving ends of all fourth driving members 201 are fixedly connected to the slide plate 202; the slide plate 202 is driven to slide by the fourth driving member 201.

[0048] After the daily screen printing work is completed, the circuit board screen printing machine needs to be cleaned and maintained to prevent the scraper 6, the ink return knife 7 and the residual ink on the working area from solidifying and affecting the next circuit board screen printing operation. The usual practice is to remove the screen 4 from the fixture 3, and remove the scraper 6 and the ink return knife 7, and then place them in a special cleaning machine for cleaning. However, the reciprocating removal and installation of the screen 4 require debugging and alignment, which makes the maintenance work very inconvenient. Therefore, when the screen printing is completed and the residual ink on the screen 4 is recovered, the fourth driving member 201 is controlled to drive the slide The plate 202 moves forward, at which time the silk-screen printing area 4002 of the silk-screen 4 is facing the sewage discharge chamber 1001, and then the scraper 6 and the ink return knife 7 are controlled to move above the sewage discharge chamber 1001, and the scraper 6 and the ink return knife 7 are lifted up and separated from the silk-screen 4, and then the two limit plates 9 are controlled to lift up and separate from the silk-screen 4 through the third driving member 107, and the two limit plates 9 are driven by the second electric slide 106 to move respectively to contact with the side of the scraper 6 and the ink return knife 7, more accurately, the guide part 9002 is made to contact with the side of the scraper 6 and the ink return knife 7, and at this time, the scraper 6 and the ink return knife 7 are controlled. The scraper 6 and the ink return knife 7 are scraped by the rubber guide part 9002, and the sides of the scraper 6 and the ink return knife 7 are cleaned by the clean water sprayed out by the nozzle 10. The sewage after flushing flows into the sewage discharge chamber 1001 below through the silk screen area 4002, and is discharged through the sewage discharge pipe on the rear side of the sewage discharge chamber 1001. After that, the scraper 6 continues to move upward through the first driving member 103, and then The limiting plate 9 on the right is controlled to move to the left so that the guiding part 9002 thereon contacts with the right side of the ink return knife 7. At this time, the up and down movement of the ink return knife 7 scrapes against the guiding part 9002, and the nozzle 10 sprays clean water to rinse the right side of the ink return knife 7. In this process, the upward movement of the scraper 6 avoids the movement of the right limiting plate 9, so that the right side of the ink return knife 7 can be cleaned, thereby achieving complete cleaning of the ink return knife 7 and avoiding ink residue on the ink return knife 7. Based on the above working principle, the scraper 6 can be completely cleaned by the same operation mode.

[0049] Taking into account that, during the silk-screen operation, the intercepting surface 9001 and the guiding part 9002 of the limiting plate 9 are also in contact with the ink, and the intercepting surface 9001 and the guiding part 9002 also need to be cleaned during maintenance, the scraper 6 and the ink return knife 7 are driven in coordination with the second slide rail 105, the second electric slide 106, the first drive member 103 and the second drive member 104 to scrape the adjacent intercepting surface 9001 and the guiding part 9002 respectively, and the nozzle 10 sprays clean water for flushing, so as to realize the cleaning and maintenance of the limiting plate 9.

[0050] After cleaning the scraper 6, ink return knife 7 and limit plate 9, control the limit plate 9 to move downward to fit with the screen 4, and then drive the limit plate 9 to move left and right through the second electric slide 106 to scrape the upper side of the screen 4 and the screen frame 4001 in the front and back directions, and cooperate with the nozzle 10 to spray clean water for flushing, so as to realize convenient cleaning of the screen 4 without removing the screen 4, reducing the difficulty of daily maintenance work. After the cleaning work is completed, the sewage in the sewage chamber 1001 is fully discharged, and then the fourth driving member 201 drives the slide plate 202 to slide and reset, and reset the limit plate 9, scraper 6 and ink return knife 7 in turn, and finally check the equipment to complete the maintenance of the equipment.

[0051] Considering that the guide part 9002 is frequently scraped during the cleaning and maintenance stage, causing wear to the rubber guide part 9002, if the guide part 9002 is found to be severely worn and deformed during daily equipment inspection, the guide part 9002 can be removed from the limit plate 9 and replaced.

[0052] According to the above work, the present invention has the following advantages:

[0053] The limiting plate 9 scrapes the screen 4, the scraper 6 and the ink return knife 7 respectively, and the nozzle 10 sprays clean water for flushing, so that the equipment can be cleaned conveniently without removing the screen 4, thereby reducing the difficulty of daily maintenance work.

[0054] In addition, the present invention also has the following advantages:

[0055] By arranging the nozzle of the nozzle 10 toward the intercepting surface 9001 , the cleaning effect on the limiting plate 9 can be improved.

[0056] A circuit board screen printing process includes the following steps:

[0057] S1: Loading, placing the circuit board on the platform of the screen printing machine body 1, aligning it with the screen printing area 4002, and then controlling the screen 4 to fit on the surface of the circuit board, and adding a sufficient amount of ink;

[0058] S2: Screen printing, controlling the scraper 6 and the ink return knife 7 to push the ink through the screen printing area 4002 to achieve screen printing on the circuit board;

[0059] S3: Maintenance: After the screen printing work is completed, the screen 4, the scraper 6 and the ink return knife 7 are scraped by driving the limit plate 9, and clean water is sprayed through the nozzle 10 for cleaning;

[0060] S4: Inspection: After the cleaning and maintenance is completed, check the status of the equipment to ensure that the silk screen printing work can run normally the next day.

[0061] 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 circuit board screen printing device, comprising a screen printing machine body (1), a mounting plate (2), a fixture (3), a screen (4) and an ink scraping assembly; the rear part of the screen printing machine body (1) is mounted with a mounting plate (2) via an electric drive guide rail; a plurality of fixtures (3) are connected to the mounting plate (2); a screen (4) is commonly mounted on the plurality of fixtures (3); the front side of the mounting plate (2) is connected with an ink scraping assembly; the mounting plate (2), the fixture (3), the screen (4) and the ink scraping assembly are driven to rise and fall via the electric drive guide rail; the characteristics are as follows: It also comprises a first connecting plate (8), a limiting plate (9) and a driving assembly; the mounting plate (2) is connected to the driving assembly; the driving assembly is connected to a plurality of first connecting plates (8); the lower side of each first connecting plate (8) is connected to a limiting plate (9) for limiting the movement of ink, and the lower side of the limiting plate (9) is in contact with the screen (4); the facing sides of the plurality of limiting plates (9) are provided with inclined intercepting surfaces (9001); each limiting plate (9) is provided with an arc-shaped guiding portion (9002), and the guiding portion (9002) is tangent to the screen (4); the first connecting plates (8) and the limiting plates (9) are driven to move left and right by the driving assembly.

2. A circuit board screen printing device according to claim 1, characterized in that: The ink scraping assembly comprises a second connecting plate (5), a scraper (6), an ink return knife (7), a first slide rail (101), a first electric slide (102), a first driving member (103) and a second driving member (104); the first slide rail (101) is fixedly connected to the mounting plate (2); the first electric slide (102) is slidably connected to the first slide rail (101); the first electric slide (102) is fixedly connected to the second connecting plate (5); the first driving member (103) is mounted on the second connecting plate (5); the driving end of the first driving member (103) is fixedly connected to the scraper (6) for embossing; the second driving member (104) is mounted on the second connecting plate (5); and the driving end of the second driving member (104) is fixedly connected to the ink return knife (7) for coating ink.

3. A circuit board screen printing device according to claim 2, characterized in that: The lower parts of the scraper (6) and the ink return knife (7) are both made of elastic material.

4. A circuit board screen printing device according to claim 2, characterized in that: It also includes a nozzle (10); each first connecting plate (8) has a cavity formed therein, and the cavity is connected to an external water supply device via a connecting pipe; a side of each first connecting plate (8) facing away from the clamp (3) is fixedly connected to and connected to a plurality of nozzles (10), and each nozzle (10) is connected to the cavity of the first connecting plate (8).

5. A circuit board screen printing device according to claim 4, characterized in that: The nozzle of the nozzle (10) is arranged toward the interception surface (9001).

6. A circuit board screen printing device according to claim 1, characterized in that: It also includes a third driving member (107); each limiting plate (9) is arranged to be slidably connected to the corresponding first connecting plate (8); each first connecting plate (8) is fixedly connected to a third driving member (107); a driving end of the third driving member (107) is fixedly connected to the corresponding limiting plate (9); and the limiting plate (9) is driven to be raised or lowered by the third driving member (107).

7. A circuit board screen printing device according to claim 1, characterized in that: The guide portion (9002) is configured to be made of a soft elastic material, and the guide portion (9002) is configured to be detachably connected to the limiting plate (9).

8. A circuit board screen printing device according to claim 1, characterized in that: The portion of the lower side of the limiting plate (9) that contacts the wire mesh (4) is made of a soft elastic material.

9. A circuit board screen printing device according to claim 1, characterized in that: It also includes a fourth driving member (201) and a slide plate (202); a sewage discharge chamber (1001) for discharging clean sewage is provided on the platform of the screen printing machine body (1); the sewage discharge chamber (1001) is connected to a sewage discharge pipe; a slide plate (202) is slidably connected to the sewage discharge chamber (1001); fourth driving members (201) are installed on both sides of the sewage discharge chamber (1001); the driving ends of all fourth driving members (201) are fixedly connected to the slide plate (202); and the slide plate (202) is driven to slide by the fourth driving member (201).

10. A circuit board screen printing process, characterized in that: The process uses a circuit board screen printing device as described in claim 4, and includes the following working steps: S1: loading, placing the circuit board on the platform of the screen printing machine body (1) and aligning it with the screen printing area (4002), then controlling the screen (4) to fit the surface of the circuit board and adding a sufficient amount of ink; S2: screen printing, controlling the scraper (6) and the ink return knife (7) to push the ink through the screen printing area (4002) to achieve screen printing on the circuit board; S3: maintenance, after the screen printing work is completed, the screen (4), the scraper (6) and the ink return knife (7) are scraped by driving the limit plate (9), and clean water is sprayed out through the nozzle (10) for cleaning; S4: inspection, after the cleaning and maintenance are completed, the status of the equipment is checked to ensure that the screen printing work of the next day can run normally.

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