A screen printing mechanism with adjustable screen printing pressure

Abstract

A screen printing mechanism with adjustable screen printing pressure, comprising an adjustable screen printing module (10) and a sliding bottom plate (200) located above a screen (600); the adjustable screen printing module (10) includes a first rotating shaft (11) fixedly installed on the sliding bottom plate (200), a squeegee mounting base (12) and a liquid pushing plate mounting seat (13) respectively rotatably installed on the first rotating shaft (11), a liquid pushing plate (14), a squeegee (15), a pressure sensor (16), a first air cylinder (17) and a second air cylinder (18) respectively installed on the sliding bottom plate (200); the first air cylinder (17) is used to act on the liquid pushing plate mounting seat (13) to lift the liquid pushing plate (14); the second air cylinder (18) is used to act on the squeegee mounting base (12) to lift the squeegee (15); the pressure sensor (16) is installed at the bottom of the squeegee mounting base (12) through a compression spring (192) so as to abut against the sliding bottom plate (200). The screen printing mechanism of the present invention is ingeniously designed and highly practical.

Description

Technical Field

[0001] The present invention relates to the field of screen printing equipment, and particularly to a screen printing mechanism with adjustable screen printing pressure. Background Art

[0002] The structure of a varistor chip resistor is formed by alternately printing and stacking ceramic paste and conductive paste. During the production process, multiple substrates move simultaneously at different positions on the production line to achieve continuous pushing of the substrates by the production line. Multiple screen printing mechanisms are provided at different positions on the production line. Each substrate will pass through these screen printing mechanisms in sequence, and different screen printing mechanisms will print on it to achieve the stacking of ceramic paste and conductive paste, thereby manufacturing varistor chip resistors.

[0003] During the production process of varistor chip resistors, the pressure of the screen printing squeegee affects the quality of varistor chip resistors. Therefore, it is necessary to design the screen printing structure in a form with adjustable pressure and real-time monitoring. And by monitoring the detection results, it is possible to determine whether to adjust the pressure of the screen printing squeegee. Currently, there is a lack of a screen printing mechanism with adjustable screen printing pressure. Summary of the Invention

[0004] The purpose of the present invention is to propose a screen printing mechanism with adjustable screen printing pressure for the above technical problems.

[0005] The technical solution adopted by the present invention to solve the technical problems is:

[0006] The present invention proposes a screen printing mechanism, including a mounting frame, a screen mounted on the mounting frame, an adjustable screen printing module, and a sliding bottom plate slidably disposed on the mounting frame and located above the screen;

[0007] The adjustable screen printing module includes a first rotating shaft directly or indirectly fixedly installed on the sliding bottom plate, a squeegee mounting base rotatably installed on the first rotating shaft, a liquid pushing plate mounting seat rotatably installed on the first rotating shaft, a liquid pushing plate, a squeegee, a pressure sensor, a first air cylinder mounted on the sliding bottom plate, and a second air cylinder mounted on the sliding bottom plate;

[0008] The liquid pushing plate is installed on one side of the liquid pushing plate mounting seat. The first air cylinder is used to apply a force to the other side of the liquid pushing plate mounting seat to lift the liquid pushing plate. The squeegee is installed on one side of the squeegee mounting base. The second air cylinder is used to apply a force to the other side of the squeegee mounting base to lift the squeegee. The pressure sensor is located on the side of the squeegee mounting base where the second air cylinder is installed and is installed at the bottom of the squeegee mounting base through a compression spring, so as to abut against the sliding bottom plate.

[0009] In the above screen printing mechanism of the present invention, a first threaded hole is formed in the blade mounting base. The adjustable screen printing module further includes a pressure adjusting nut externally threadedly connected to the first threaded hole and a first bearing axially mounted in the pressure adjusting nut; a compression spring is mounted at the bottom of the first bearing.

[0010] In the above screen printing mechanism of the present invention, the adjustable screen printing module further includes a blade pressing device. The blade pressing device includes a pressing plate for cooperating with the blade mounting base to clamp the blade, and a screw fixing member threadedly connected to the blade mounting base for fixing the pressing plate and the blade mounting base together.

[0011] In the above screen printing mechanism of the present invention, a receiving groove is formed in the mounting surface of the blade mounting base facing the pressing plate, and a second threaded hole is formed at the bottom of the receiving groove; a second bearing is received in the receiving groove, the screw fixing member extends into the receiving groove and is threadedly connected to the second threaded hole, and the second bearing is sleeved on the screw fixing member.

[0012] In the above screen printing mechanism of the present invention, the screen printing mechanism further includes a ball screw, a driving motor, and a guide post; the driving motor is mounted on the mounting frame, the screw rod of the ball screw is coaxially connected to the output shaft of the driving motor through a coupling, and the guide post is fixedly mounted on the mounting frame and is arranged in parallel with the screw rod of the ball screw; the sliding bottom plate is connected to the nut of the ball screw; the sliding bottom plate is also slidably sleeved on the guide post.

[0013] In the above screen printing mechanism of the present invention, the screen printing mechanism further includes a screen pressing module mounted on the mounting frame for pressing the screen tightly;

[0014] The screen pressing module includes a base mounted at the bottom of the mounting frame, a second rotating shaft rotatably mounted on the base, a cam fixedly mounted on the second rotating shaft, a first pressing spring, a pressing member, and a third bearing;

[0015] A first receiving cavity is formed on the side surface of the base, and the third bearing is arranged in the first receiving cavity; the pressing member is connected to the third bearing and is in contact with the cam; the first pressing spring is mounted on the base and is connected to the pressing member to make the pressing member abut against the cam through its own elastic force;

[0016] The screen pressing module further includes a first leaning member mounted at the bottom of the mounting frame and opposite to the first receiving cavity, and a first screen adjusting nut threadedly connected to the first leaning member for cooperating with the third bearing in the first receiving cavity to clamp the screen tightly.

[0017] In the above-mentioned screen printing mechanism of the present invention, the screen pressing module further includes a handle installed on the second rotating shaft; a fourth bearing is installed on the handle; the screen pressing module further includes a second leaning member installed at the bottom of the mounting frame, and a second screen adjusting nut threadedly connected to the second leaning member and used to cooperate with the fourth bearing to clamp the screen.

[0018] In the above-mentioned screen printing mechanism of the present invention, the fourth bearing is installed on the handle through a second pressing spring.

[0019] In the above-mentioned screen printing mechanism of the present invention, the screen pressing module further includes a connecting seat axially and fixedly installed at the end of the second rotating shaft, and the handle is rotatably installed on the connecting seat on a radial plane of the connecting seat.

[0020] The present invention constructs a screen printing mechanism with adjustable screen printing pressure, which adjusts the pressure of the screen printing squeegee by using the lever principle, and monitors and detects the pressure of the screen printing squeegee by arranging a pressure sensor on the opposite side of the screen printing squeegee by using the mechanical characteristics of the lever principle, so as to facilitate the purpose of controllable adjustment of the screen printing pressure. The screen printing mechanism of the present invention is ingeniously designed and has strong practicability. Description of the Drawings

[0021] Figure 1 Shows a schematic structural diagram of a screen printing mechanism with adjustable screen printing pressure according to a preferred embodiment of the present invention;

[0022] Figure 2 Shows Figure 1 A schematic structural diagram of the adjustable screen printing module of the shown screen printing mechanism;

[0023] Figure 3 Shows Figure 2 A schematic cross-sectional view of the shown adjustable screen printing module;

[0024] Figure 4 Shows Figure 1 A schematic structural diagram of the screen pressing module of the shown screen printing mechanism. Detailed Embodiments

[0025] The technical problem to be solved by the present invention is that: in the production process of varistor chip resistors, the pressure of the screen printing squeegee affects the quality of varistor chip resistors; therefore, it is necessary to design the screen printing structure in a form with adjustable pressure and real-time monitoring; and through monitoring the detection results, it can be judged whether to adjust the pressure of the screen printing squeegee. At present, there is a lack of a screen printing mechanism with adjustable screen printing pressure. The technical idea proposed by the present invention for the above technical problem is: to construct a screen printing mechanism with adjustable screen printing pressure, which adjusts the pressure of the screen printing squeegee by using the lever principle, and monitors and detects the pressure of the screen printing squeegee by arranging a pressure sensor on the opposite side of the screen printing squeegee by using the mechanical characteristics of the lever principle, so as to facilitate the purpose of controllable adjustment of the screen printing pressure.

[0026] To make the technical solutions, technical objectives, and technical effects of the present invention clearer so that those skilled in the art can understand and implement the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] As Figures 1-4 shown, Figure 1 shows a schematic structural diagram of a screen printing mechanism with adjustable screen printing pressure according to a preferred embodiment of the present invention; Figure 2 shows Figure 1 a schematic structural diagram of an adjustable screen printing module of the screen printing mechanism shown; Figure 3 shows Figure 2 a schematic cross-sectional view of an adjustable screen printing module shown; Figure 4 shows Figure 1 a schematic structural diagram of a screen pressing module of the screen printing mechanism shown. Specifically, the screen printing mechanism includes a mounting frame 100, a screen 600 mounted on the mounting frame 100, an adjustable screen printing module 10, and a sliding bottom plate 200 slidably disposed on the mounting frame 100 and located above the screen 600;

[0028] As Figures 2-3 shown, the adjustable screen printing module 10 includes a first rotating shaft 11 directly or indirectly fixedly mounted on the sliding bottom plate 200, a squeegee mounting base 12 rotatably mounted on the first rotating shaft 11, a liquid pushing plate mounting seat 13 rotatably mounted on the first rotating shaft 11, a liquid pushing plate 14, a squeegee 15, a pressure sensor 16, a first cylinder 17 mounted on the sliding bottom plate 200, and a second cylinder 18 mounted on the sliding bottom plate 200;

[0029] The liquid pushing plate 14 is mounted on one side of the liquid pushing plate mounting seat 13, and the first cylinder 17 is used to apply a force to the other side of the liquid pushing plate mounting seat 13 to lift the liquid pushing plate 14; the squeegee 15 is mounted on one side of the squeegee mounting base 12, and the second cylinder 18 is used to apply a force to the other side of the squeegee mounting base 12 to lift the squeegee 15; the pressure sensor 16 is located on the side of the squeegee mounting base 12 where the second cylinder 18 is mounted and is mounted on the bottom of the squeegee mounting base 12 through a compression spring 192, so as to abut against the sliding bottom plate 200.

[0030] In the above technical solution, through the first rotating shaft 11, the scraper mounting base 12 and the liquid pushing plate mounting seat 13 respectively form levers. In this way, when the first air cylinder 17 pushes the liquid pushing plate mounting seat 13, the liquid pushing plate mounting seat 13 can be lifted, achieving the purpose of lifting the liquid pushing plate 14; when the second air cylinder 18 pushes the scraper mounting base 12, the scraper mounting base 12 can be lifted, achieving the purpose of lifting the scraper 15. The pressure sensor 16 indirectly monitors the screen printing pressure of the screen printing mechanism by monitoring the acting force exerted on the sliding bottom plate 200 by the scraper mounting base 12 through the compression spring 192 and using the lever mechanics principle. Specifically, in this embodiment, the first air cylinder 17 and the second air cylinder 18 are respectively mounted on the sliding bottom plate 200 through supports. It can be understood that in other embodiments, the first air cylinder 17 and the second air cylinder 18 can also be connected to the sliding bottom plate 200 through the support structures formed on their own shells.

[0031] In this embodiment, the first rotating shaft 11 is fixedly connected to the sliding bottom plate 200 through a connecting member 111. It can be understood that the connecting member 111 can be a component independent of the sliding bottom plate 200 or integrally formed with the sliding bottom plate 200.

[0032] Furthermore, in this embodiment, as Figure 3 shown, a first threaded hole 121 is provided on the scraper mounting base 12. The adjustable screen printing module 10 further includes a pressure adjusting nut 19 externally threaded to the first threaded hole 121 and a first bearing 191 axially mounted in the pressure adjusting nut 19; the compression spring 192 is mounted at the bottom of the first bearing 191. By rotating the pressure adjusting nut 19, the relative height change between the pressure adjusting nut 19 and the scraper mounting base 12 can be realized, thereby compressing the compression spring 192 and adjusting the screen printing pressure of the screen printing mechanism. At the same time, the first bearing 191 releases the torque generated by rotating the pressure adjusting nut 19, thus avoiding the influence on the compression spring 192.

[0033] During specific operation, when the sliding bottom plate 200 drives the adjustable screen printing module 10 to move forward, the second air cylinder 18 extends to lift the scraper 15, and the first air cylinder 17 retracts, and the liquid pushing plate 14 descends to push the slurry forward evenly; when the sliding bottom plate 200 drives the adjustable screen printing module 10 to move back, the first air cylinder 17 extends, the second air cylinder 18 retracts, the scraper 15 descends to press on the screen surface to hold down the screen, and the scraper scrapes the screen back to scrape the slurry onto the substrate located below the screen, thus completing screen printing.

[0034] Furthermore, as Figure 3As shown in the figure, the adjustable screen printing module 10 further includes a squeegee pressing device 101. The squeegee pressing device 101 includes a pressing plate 102 for cooperating with the squeegee mounting base 12 to clamp the squeegee 15, and a screw fixing member 103 threadedly connected to the squeegee mounting base 12 for fixing the pressing plate 102 and the squeegee mounting base 12 together. Preferably, a receiving groove is formed on the mounting surface of the squeegee mounting base 12 facing the pressing plate 102, and a second threaded hole is formed at the bottom of the receiving groove; a second bearing 104 is received in the receiving groove, the screw fixing member 103 extends into the receiving groove and is threadedly connected to the second threaded hole, and the second bearing 104 is sleeved on the screw fixing member 103. In this way, through the second bearing 104, the influence of rotating the screw fixing member 103 on the squeegee pressing device 101 is avoided, and the problem of non-parallelism between the squeegee and the screen can be automatically adjusted.

[0035] Further, as Figure 1 shown in the figure, the screen printing mechanism further includes a ball screw 300, a driving motor 400, and a guide post 500; the driving motor 400 is installed on the mounting frame 100, the screw rod of the ball screw 300 is coaxially connected to the output shaft of the driving motor 400 through a coupling, and the guide post 500 is fixedly installed on the mounting frame 100 and is arranged parallel to the screw rod of the ball screw 300; the sliding bottom plate 200 is connected to the nut of the ball screw 300; the sliding bottom plate 200 is also slidably sleeved on the guide post 500. In this way, when the driving motor works, the screw rod of the ball screw 300 slides relative to its nut, so that the sliding bottom plate 200 slides along the guide post 500.

[0036] Further, in this embodiment, as Figures 1-4 shown in the figure, the screen printing mechanism further includes a screen pressing module 20 installed on the mounting frame 100 for pressing the screen 600. Specifically, in this embodiment, as Figure 4 shown in the figure, the screen pressing module 20 includes a base body 21 installed at the bottom of the mounting frame 100, a second rotating shaft 22 rotatably installed on the base body 21, a cam 23 fixedly installed on the second rotating shaft 22, a first pressing spring 24, a pressing member 25, and a third bearing 26;

[0037] A first receiving cavity 211 is formed on the side surface of the base body 21, and the third bearing 26 is arranged in the first receiving cavity 211; the pressing member 25 is connected to the third bearing 26, and the pressing member 25 is in contact with the cam 23; the first pressing spring 24 is installed on the base body 21 and is connected to the pressing member 25 to make the pressing member 25 abut against the cam 23 through its own elastic force;

[0038] The wire mesh pressing module 20 further includes a first leaning member 29 installed at the bottom of the mounting frame 100 and disposed opposite to the first receiving cavity 211, and a first wire mesh adjusting nut 27 threadedly connected to the first leaning member 29 and used to cooperate with the third bearing 26 in the first receiving cavity 211 to clamp the wire mesh 600. Preferably, two first wire mesh adjusting nuts 27 are provided.

[0039] In the above technical solution of the wire mesh pressing module, by rotating the second rotating shaft 22, the cam 23 can be driven to rotate; when the cam 23 rotates to push the pressing member 25 backward, the pressing member 25 pulls the third bearing 26 backward. At this time, the wire mesh can be loaded into the gap between the third bearing 26 and the first leaning member 29; when the cam 23 continues to rotate so that the pressing member 25 advances under the elastic force of the first pressing spring 24, the pressing member 25 drives the third bearing 26 to cooperate with the first leaning member 29 to clamp the wire mesh 600. Preferably, two cams 23 are provided, two pressing members 25 are correspondingly provided, and two first pressing springs 24 are also correspondingly provided.

[0040] Further, the wire mesh pressing module 20 further includes a handle 201 installed on the second rotating shaft 22; a fourth bearing 202 is installed on the handle 201; the wire mesh pressing module 20 further includes a second leaning member installed at the bottom of the mounting frame 100, and a second wire mesh adjusting nut 28 threadedly connected to the second leaning member and used to cooperate with the fourth bearing 202 to clamp the wire mesh 600.

[0041] The second rotating shaft 22 can be driven to rotate through the handle 201; the purpose of clamping the wire mesh from another direction is achieved through the cooperation of the second leaning member and the fourth bearing 202. Generally, the second leaning member has the same structure as the first leaning member, and the second wire mesh adjusting nut 28 has the same structure as the first wire mesh adjusting nut 27.

[0042] Further, in this embodiment, the fourth bearing 202 is installed on the handle 201 through a second pressing spring 205.

[0043] Further, in this embodiment, the wire mesh pressing module 20 further includes a connecting seat 204 axially and fixedly installed at the end of the second rotating shaft 22, and the handle 201 is rotatably installed on the connecting seat 204 in a radial plane of the connecting seat 204. In this way, by rotating the handle 201 in the radial plane of the connecting seat 204, a gap for the wire mesh to be placed is formed between the second leaning member and the fourth bearing 202. After pulling down the handle and buckling the handle into the mounting frame to press the wire mesh by the fourth bearing 202, by adjusting the first wire mesh adjusting nut 27 and the second wire mesh adjusting nut 28, the third bearing 26 and the fourth bearing 202 are pressed by the spring so that the wire mesh is always in a clamped state.

[0044] The present invention constructs a screen printing mechanism with adjustable screen printing pressure, which adjusts the pressure of the screen printing squeegee by using the lever principle. A pressure sensor is arranged on the opposite side of the screen printing squeegee by utilizing the mechanical characteristics of the lever principle to monitor and detect the pressure of the screen printing squeegee, so as to facilitate the purpose of controllable adjustment of the screen printing pressure. The screen printing mechanism of the present invention is ingeniously designed and highly practical.

[0045] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all improvements or transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A silk screen printing mechanism with adjustable silk screen printing pressure, characterized in that, It includes a mounting rack (100), a wire mesh (600) mounted on the mounting rack (100), an adjustable screen printing module (10), and a sliding bottom plate (200) slidably disposed on the mounting rack (100) and located above the wire mesh (600); The adjustable screen printing module (10) includes a first rotating shaft (11) directly or indirectly fixedly mounted on the sliding bottom plate (200), a squeegee mounting base (12) rotatably mounted on the first rotating shaft (11), a liquid pushing plate mounting seat (13) rotatably mounted on the first rotating shaft (11), a liquid pushing plate (14), a squeegee (15), a pressure sensor (16), a first air cylinder (17) mounted on the sliding bottom plate (200), and a second air cylinder (18) mounted on the sliding bottom plate (200); The liquid pushing plate (14) is mounted on one side of the liquid pushing plate mounting seat (13), and the first air cylinder (17) is used to apply a force to the other side of the liquid pushing plate mounting seat (13) to lift the liquid pushing plate (14); the squeegee (15) is mounted on one side of the squeegee mounting base (12), and the second air cylinder (18) is used to apply a force to the other side of the squeegee mounting base (12) to lift the squeegee (15); the pressure sensor (16) is located on the side of the squeegee mounting base (12) where the second air cylinder (18) is mounted, and is mounted at the bottom of the squeegee mounting base (12) through a compression spring (192) so as to abut against the sliding bottom plate (200); The adjustable screen printing module (10) further includes a squeegee pressing device (101), and the squeegee pressing device (101) includes a pressing plate (102) for cooperating with the squeegee mounting base (12) to clamp the squeegee (15), and a screw fixing member (103) threadedly connected to the squeegee mounting base (12) for fixing the pressing plate (102) and the squeegee mounting base (12) together; The screen printing mechanism further includes a wire mesh pressing module (20) mounted on the mounting rack (100) for pressing the wire mesh (600); The wire mesh pressing module (20) includes a base body (21) mounted at the bottom of the mounting rack (100), a second rotating shaft (22) rotatably mounted on the base body (21), a cam (23) fixedly mounted on the second rotating shaft (22), a first pressing spring (24), a pressing member (25), and a third bearing (26); A first receiving cavity (211) is formed on the side surface of the base body (21), and the third bearing (26) is disposed in the first receiving cavity (211); the pressing member (25) is connected to the third bearing (26) and is in contact with the cam (23); the first pressing spring (24) is mounted on the base body (21) and is connected to the pressing member (25) to make the pressing member (25) abut against the cam (23) through its own elastic force; The wire mesh pressing module (20) further includes a first leaning member (29) installed at the bottom of the mounting frame (100) and disposed opposite to the first accommodation cavity (211), and a first wire mesh adjusting nut (27) threadedly connected to the first leaning member (29) and used to cooperate with the third bearing (26) in the first accommodation cavity (211) to clamp the wire mesh (600).

2. The screen printing mechanism according to claim 1, characterized in that, A first threaded hole (121) is formed in the squeegee mounting base (12). The adjustable screen printing module (10) further includes a pressure adjusting nut (19) externally threadedly connected to the first threaded hole (121) and a first bearing (191) axially installed in the pressure adjusting nut (19); a compression spring (192) is installed at the bottom of the first bearing (191).

3. The screen printing mechanism according to claim 1, characterized in that, An accommodation groove is formed in the mounting surface of the squeegee mounting base (12) facing the pressing plate (102), and a second threaded hole is formed at the bottom of the accommodation groove; a second bearing (104) is accommodated in the accommodation groove, a screw rod fixing member (103) extends into the accommodation groove and is threadedly connected to the second threaded hole, and the second bearing (104) is sleeved on the screw rod fixing member (103).

4. The screen printing mechanism according to claim 1, characterized in that, The screen printing mechanism further includes a ball screw (300), a driving motor (400), and a guide post (500); the driving motor (400) is installed on the mounting frame (100), the screw rod of the ball screw (300) is coaxially connected to the output shaft of the driving motor (400) through a coupling, the guide post (500) is fixedly installed on the mounting frame (100) and is arranged parallel to the screw rod of the ball screw (300); the sliding bottom plate (200) is connected to the nut of the ball screw (300); the sliding bottom plate (200) is also slidably sleeved on the guide post (500).

5. The screen printing mechanism according to claim 1, wherein The wire mesh pressing module (20) further includes a handle (201) installed on the second rotating shaft (22); a fourth bearing (202) is installed on the handle (201); the wire mesh pressing module (20) further includes a second leaning member installed at the bottom of the mounting frame (100), and a second wire mesh adjusting nut (28) threadedly connected to the second leaning member and used to cooperate with the fourth bearing (202) to clamp the wire mesh (600).

6. The screen printing mechanism according to claim 5, characterized in that, The fourth bearing (202) is installed on the handle (201) through a second compression spring (205).

7. The screen printing mechanism according to claim 6, wherein, The wire mesh pressing module (20) further includes a connection seat (204) axially and fixedly installed at the end of the second rotating shaft (22), and the handle (201) is rotatably installed on the connection seat (204) in a radial plane of the connection seat (204).

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