CN212472748U - Multifunctional low-printing-pressure precise screen printing device - Google Patents

Abstract

The utility model discloses a multi-functional low accurate half tone printing device of printing pressure, including the fuselage with be located last unloading station, silk screen printing platform, optics vision positioning mechanism, half tone on the fuselage and load plane, high accuracy silk screen printing press mechanism and go up unloading slip table. The feeding and discharging station and the screen printing platform are arranged below a screen printing plate loading plane, the high-precision screen printing press mechanism is arranged above the screen printing plate loading plane, the optical vision positioning mechanism is arranged at the edge of the screen printing plate loading plane and located above the feeding and discharging station, the feeding and discharging sliding table is arranged below the screen printing plate loading plane and connected with the screen printing platform, and the screen printing platform is controlled to move on the feeding and discharging station. The invention realizes high-precision, high-stability, low-line width, ultrathin and uniform-thickness printing, and ensures high-quality and high-efficiency product silk-screen printing.

Description

Multifunctional low-printing-pressure precise screen printing device

Technical Field

The utility model relates to a screen printing technical field, more specifically the saying so relates to a multi-functional accurate screen printing device of low printing pressure.

Background

The screen printing technique originates from China, has been in two thousand years history so far, and in the aspect of screen printing equipment, the earliest development is Germany and Italy, and compared with developed countries, the development of screen printing machines in China is relatively late. The screen printing equipment on the market mainly takes plane printing as a main part, the domestic technical level and the precision are lower, and particularly the production of a high-precision low-pressure screen printing machine is realized. Import equipment is often selected when low-printing-pressure precise screen precious metal printing application equipment for silicon wafers, glass, plastics and ceramic substrates with extremely high requirements on screen printing quality (screen printing width, thickness, uniformity and the like) is selected; at present, the problems of domestic screen printing are mainly reflected in the following aspects: the quality and the precision are poor; speed and digitization are deficient; the stability difference is obvious; and the pressure matching precision of the silk-screen scraper is poor.

Therefore, how to improve the quality of screen printing, and realize the uniform printing of the low-printing-pressure precise screen printing plate with precision, digitalization, high stability and high efficiency, and the improvement of the quality of the screen printing product is a problem to be solved by the technical staff in the field.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a multi-functional low accurate half tone printing device of printing pressure, including the fuselage with be located last unloading station, silk screen printing platform, optics vision positioning mechanism, half tone on the fuselage and load plane, high accuracy silk screen printing press mechanism and go up unloading slip table. The feeding and discharging station and the silk screen platform are installed below a screen loading plane, the high-precision silk screen press mechanism is installed above the screen loading plane, the optical vision positioning mechanism is installed at the edge of the screen loading plane and located above the feeding and discharging station, and the feeding and discharging sliding table is installed below the screen loading plane and connected with the silk screen platform and controls the silk screen platform to move at the feeding and discharging station. The invention realizes high-precision, high-stability, low-line width, ultrathin and uniform-thickness printing, and ensures high-quality and high-efficiency product silk-screen printing.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a multifunctional low printing pressure precision screen printing device comprises: the screen printing machine comprises a machine body, a feeding and discharging station, a screen printing platform, an optical visual positioning mechanism, a screen printing plate loading plane, a high-precision screen printing pressure mechanism and a feeding and discharging sliding table, wherein the feeding and discharging station, the screen printing platform, the optical visual positioning mechanism, the screen printing plate loading plane, the high-precision screen printing pressure mechanism; the feeding and discharging station and the screen printing platform are positioned below the screen printing plate loading plane; the high-precision screen printing pressure mechanism is arranged above the screen loading plane and is in sliding connection with the screen loading plane; the optical vision positioning mechanism is arranged on the edge of the loading plane of the screen printing plate and is positioned above the feeding and discharging station; and the feeding and discharging sliding table is installed below the screen loading plane and connected with the screen printing platform to control the screen printing platform to move on the feeding and discharging station. Placing a workpiece to be screen-printed on the screen printing platform

Preferably, the screen plate loading plane comprises a screen plate fixing plate and a plurality of marble pillars, and the marble pillars are fixedly installed at corners of the bottom surface of the screen plate fixing plate and support the screen plate fixing plate to be horizontally balanced; the screen is fixed on the bottom surface of the screen fixing plate.

Preferably, the high-precision screen printing pressure mechanism comprises a balance weight balance fine adjustment mechanism, an ink return knife connecting mechanism, a scraper balance weight hammer mechanism, a return mechanism, a scraper seat assembly, a scraper and an ink return knife; the balance weight balance fine adjustment mechanism, the ink return knife connecting mechanism, the scraper balance weight hammer mechanism and the return mechanism are arranged on the scraper seat assembly; the scraper is arranged on one side, close to the screen fixing plate, of the scraper counterweight mechanism; the ink return knife is arranged on one side of the ink return knife connecting mechanism close to the screen fixing plate.

Preferably, go up the unloading station and be provided with two sets of slide rails, go up the unloading slip table and install on the slide rail, the silk screen printing platform is installed go up on the unloading slip table, go up the unloading slip table and drive the silk screen printing platform is in it slides to go up the unloading station.

Preferably, the return mechanism comprises a cylinder, a mandril and a balance rod; the cylinder and the ejector rod are connected and arranged at one end of the balancing rod; the balance rod is rotatably connected to a support and rotating seat fixedly arranged on the scraper seat assembly through a rotating shaft; the air cylinder drives the balance rod to do lever motion by pushing the ejector rod, and the free end of the balance rod moves up and down.

Preferably, the scraper counterweight hammer mechanism is mounted at the front part of the supporting and rotating seat, and the ink return blade connecting mechanism is mounted between the supporting and rotating seat and the return mechanism; the balance weight balance fine adjustment mechanism is arranged at the end of the balance rod where the return mechanism is arranged, the balance weight balance fine adjustment mechanism comprises a screw rod and a fine adjustment balancing weight matched and rotatably connected with the screw rod, the screw rod is inserted into the end of the balance rod, and the fine adjustment balancing weight is arranged on the screw rod in a penetrating mode. The size of the up-down moving distance generated by the same acting force of the air cylinder when the balance rod does lever movement is adjusted through the position adjustment of the fine adjustment balancing weight on the screw rod.

Preferably, the scraper counterweight hammer mechanism comprises a scraper counterweight block and a scraper connecting piece, and the ink return blade connecting mechanism comprises a lifting cylinder and an ink return blade connecting piece; the upper parts of the scraper connecting piece and the ink return knife connecting piece are respectively and fixedly provided with the scraper balancing weight and the lifting cylinder, the lower parts of the scraper connecting piece and the ink return knife connecting piece are respectively and fixedly provided with the scraper and the ink return knife, the other ends of the scraper and the ink return knife are contacted with the screen printing plate, and the contact pressure between the scraper and the ink return knife and the screen printing plate is controlled through the quality control of the scraper balancing weight and the lifting distance of the lifting cylinder; the middle part of the scraper connecting piece is of a hollow structure, a pulley is fixedly mounted at the upper part of the hollow structure, and the pulley is in contact with the upper surface of the free end of the balance rod.

Preferably, the screen printing device further comprises a protective cover, wherein the protective cover is sealed with the machine body in a buckled mode, the feeding and discharging station is arranged on the screen printing platform, the optical vision positioning mechanism is arranged on the screen printing plate loading plane, and the high-precision screen printing pressure mechanism and the feeding and discharging sliding table are arranged on the screen printing plate loading plane.

Preferably, the optical vision positioning mechanism comprises a right-angle bracket and two groups of optical coordinate positioning instruments; the right-angle support is fixedly installed on the side edge of the screen loading plane, the two groups of optical coordinate positioning instruments are respectively installed on the two right-angle edges of the right-angle support, and the optical coordinate positioning instruments vertically align with the feeding and discharging stations. And measuring the coordinates and the distance of the screen printing plate by the optical coordinate positioning instrument, thereby calibrating and adjusting the position of the high-precision silk-screen pressure mechanism and the silk-screen pressure.

Preferably, the inner sides of the marble pillars at the two side edges of the lower surface of the screen fixing plate are provided with screen mounting slots, and a plurality of locking fixing screws penetrate through the screen fixing plate above the screen mounting slots. The screen plate is inserted into the screen plate mounting clamping groove with the L-shaped cross section, and the locking fixing screws are rotated to enable the locking fixing screws to contact and tightly jack the screen plate, so that the screen plate is fixed.

Preferably, slide rails are fixed on two sides of the upper surface of the screen printing plate, and the high-precision screen printing pressure mechanism is in sliding connection with the screen printing plate fixing plate through the slide rails, so that the screen printing plate can slide in the same direction as the upper and lower material sliding tables.

According to the technical scheme, compare with prior art, the utility model provides a multi-functional low accurate half tone printing device of printing pressure adopts low pressure accurate balance counter weight mechanism to carry out the balance control of silk screen printing pressure to the scraper of silk screen printing, adopts scraper counter weight hammer mechanism to realize the control to scraper silk screen printing pressure through the quality control to the balancing weight, adopts ink return sword coupling mechanism to realize the pressure control to ink return sword spreading ink through the lift distance control to lift cylinder. Meanwhile, the positioning and calibration of the screen printing platform are realized by adopting an optical vision positioning mechanism, and the accuracy of the screen printing position is guaranteed. The screen printing device is suitable for screen printing of workpieces of all plane types, and is suitable for various shapes, various printing inks, various screen printing thicknesses and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic front view of a multifunctional low printing pressure precision screen printing apparatus according to the present invention;

FIG. 2 is a side view of the multifunctional low printing pressure precision screen printing apparatus provided by the present invention;

FIG. 3 is a schematic structural diagram of an optical visual positioning mechanism according to the present invention;

FIG. 4 is a schematic diagram of a side view structure of the high-precision screen printing pressure mechanism provided by the present invention;

FIG. 5 is a schematic diagram of a side view of a loading plane of a screen printing plate according to the present invention;

FIG. 6 is a schematic view of a structure of a loading/unloading sliding table provided by the present invention;

fig. 7 is a schematic structural diagram of a high-precision screen printing pressure mechanism provided by the utility model;

fig. 8 is a schematic structural diagram of a return mechanism provided by the present invention;

fig. 9 is a schematic structural view of a scraper counterweight hammer mechanism provided by the present invention;

fig. 10 is a schematic structural diagram of a scraper counterweight mechanism in a front view according to the present invention;

fig. 11 is a schematic front view of the scraper according to the present invention;

FIG. 12 is a schematic view of the loading and unloading level structure provided by the present invention;

fig. 13 is a schematic view of a loading structure of a screen printing plate according to the present invention;

fig. 14 is a schematic view of a protective cover structure according to the present invention.

In the drawings: 1-machine body, 2-feeding and discharging station, 21-slide rail, 3-screen printing platform, 4-optical visual positioning mechanism, 41-right angle support, 42-optical coordinate positioning instrument, 5-screen printing plate loading plane, 51-screen printing plate fixing plate, 52-marble pillar, 53-screen printing plate mounting clamping groove, 54-locking fixing screw, 55-screen printing plate, 6-high precision screen printing pressure mechanism, 61-counterweight balance fine adjustment mechanism, 611-screw rod, 612-fine adjustment counterweight block, 621-lifting cylinder, 622-ink returning blade connecting piece, 63-scraper counterweight mechanism, 631-scraper counterweight block, 632-scraper connecting piece, 633-pulley, 634-horizontal adjustment screw rod, 635-rotary connecting shaft, 64-returning mechanism, 641-air cylinder, 642-ejector rod, 643-balance rod, 65-scraper seat component, 651-rotating shaft, 652-supporting and rotating seat mechanism, 66-scraper, 67-ink return knife, 7-loading and unloading sliding table and 8-protective cover.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model discloses multi-functional accurate half tone printing device of low printing pressure, include: the screen printing machine comprises a machine body 1, and a feeding and discharging station 2, a screen printing platform 3, an optical visual positioning mechanism 4, a screen printing plate loading plane 5, a high-precision screen printing pressure mechanism 6 and a feeding and discharging sliding table 7 which are positioned on the machine body 1; the feeding and discharging station 2 and the screen printing platform 3 are positioned below the screen printing plate loading plane 5; the high-precision silk-screen pressure mechanism 6 is arranged above the screen loading plane 5 and is in sliding connection with the screen loading plane 5; the optical vision positioning mechanism 4 is arranged at the edge of the screen loading plane 5 and is positioned above the feeding and discharging station 2; and the feeding and discharging sliding table 7 is arranged below the screen loading plane 5 and connected with the screen printing platform 3 to control the screen printing platform 3 to move on the feeding and discharging station 2. And placing a workpiece to be screen-printed on the screen printing platform 3.

In order to further optimize the above technical solution, the screen loading plane 5 includes a screen fixing plate 51 and a plurality of marble pillars 52, the marble pillars 52 are fixedly installed at corners of the bottom surface of the screen fixing plate 51, and support the screen fixing plate 51 to be horizontally balanced; the screen 55 is fixed to the bottom surface of the screen fixing plate 51. The screen plate loading plane 5 is guaranteed to be very flat and stable, and the silk plate is guaranteed to be parallel to a printed workpiece, so that the precision is guaranteed.

In order to further optimize the technical scheme, the high-precision silk-screen pressure mechanism 6 comprises a balance weight balance fine adjustment mechanism 61, an ink return blade connecting mechanism, a scraper balance weight hammer mechanism 63, a return mechanism 64, a scraper seat assembly 65, a scraper 66 and an ink return blade 67; the balance weight fine adjustment mechanism 61, the ink return blade connecting mechanism, the scraper balance weight hammer mechanism 63 and the return mechanism 64 are arranged on the scraper seat component 65; the scraper 66 is arranged on one side of the scraper counterweight mechanism 63 close to the screen fixing plate 51; the ink return knife 67 is arranged on one side of the ink return knife connecting mechanism close to the screen fixing plate 51; the ink return blade attachment mechanism and blade counterweight mechanism 63 are located at the front edge of the blade holder assembly 65, and the blade 66 is located in front of the ink return blade 67. The return mechanism 64 can achieve the return effect by up-down jacking, and the balance weight balance fine adjustment mechanism 61 achieves the force application balance of the scraper 66 and the ink return blade 67 by left-right fine adjustment.

In order to further optimize the above technical scheme, go up unloading station 2 and be provided with two sets of slide rails 21, go up the unloading slip table and install on slide rail 21, silk screen printing platform 3 is installed on going up unloading slip table 7, goes up unloading slip table 7 and drives silk screen printing platform 3 and control the linear sliding in going up unloading station 2.

In order to further optimize the above technical solution, the return mechanism 64 includes an air cylinder 641, a top rod 642 and a balance rod 643; the air cylinder 641 is connected with the ejector rod 642 and arranged at one end of the balance rod 643; the balancing rod 643 is rotatably connected to the supporting and rotating base 652 fixedly mounted on the blade holder assembly 65 through the rotating shaft 651; the air cylinder 641 makes the balance rod 643 do lever motion by pushing the top rod 642, and the free end of the balance rod 643 moves up and down.

In order to further optimize the technical scheme, the scraper counterweight hammer mechanism 63 is arranged at the front part of the supporting and rotating seat 652, and the ink return blade connecting mechanism is arranged between the supporting and rotating seat 652 and the return mechanism 64; the counterweight balance fine adjustment mechanism 61 is installed at the end of the balance rod 643 where the return mechanism 64 is installed, the counterweight balance fine adjustment mechanism 61 comprises a screw rod 611 and a fine adjustment counterweight block 612 which is in matched and rotary connection with the screw rod 611, the screw rod 611 is inserted into the end of the balance rod 643, and the fine adjustment counterweight block 612 is arranged on the screw rod 611 in a penetrating mode. The distance of up-and-down movement when the balance rod 643 performs lever movement is adjusted by finely adjusting the position of the balancing weight 612 on the screw 611.

In order to further optimize the above technical solution, the scraper counterweight hammer mechanism 63 includes a scraper counterweight 631 and a scraper connector 632, and the ink return blade connecting mechanism includes a lifting cylinder 621 and an ink return blade connector 622; the upper parts of the scraper connecting piece 632 and the ink return blade connecting piece 622 are respectively fixedly provided with a scraper balancing weight 631 and a lifting cylinder 621, the lower parts of the scraper connecting piece 632 and the ink return blade connecting piece 622 are respectively fixedly provided with a scraper 66 and an ink return blade 67, the other ends of the scraper 66 and the ink return blade 67 are contacted with the screen 55, and the contact pressure between the scraper 66 and the ink return blade 67 and the screen 55 is controlled through the quality control of the scraper balancing weight 631 and the lifting distance of the lifting cylinder 621; the middle part of the scraper connecting piece 632 is of a hollow structure, the upper part of the hollow structure is fixedly provided with a pulley 633, and the pulley 633 is contacted with the upper surface of the free end of the balance bar 643. The control of the precise screen printing force of the scraper 66 and the precise ink returning force of the ink returning knife 67 is achieved by configuring the scraper balancing weight 631 with different weights and adjusting the lifting cylinder 621, the silk screen is not easy to damage, and the service lives of the screen 55, the scraper 66 and the ink returning knife 67 are prolonged.

In order to further optimize the technical scheme, the screen printing device further comprises a protective cover 8, wherein the protective cover 8 is buckled with the machine body 1 to seal the feeding and discharging station 2, the screen printing platform 3, the optical vision positioning mechanism 4, the screen printing plate loading plane 5, the high-precision screen printing pressure mechanism 6 and the feeding and discharging sliding table 7.

In order to further optimize the above technical solution, the optical vision positioning mechanism 4 includes a right-angle bracket 41 and two sets of optical coordinate positioning instruments 42; the right-angle support 41 is fixedly arranged on the side edge of the screen loading plane 5, the two groups of optical coordinate positioning machines 42 are respectively arranged on the two right-angle edges of the right-angle support 41, and the optical coordinate positioning machines 42 are vertically aligned with the feeding and discharging station 2.

In order to further optimize the above technical solution, the optical coordinate positioning apparatus 42 is a CCD camera.

In order to further optimize the above technical solution, screen mounting slots 53 are provided on the inner sides of the marble pillars 52 on both sides of the lower edge of the screen fixing plate 51, and a plurality of locking fixing screws 54 are provided on the screen fixing plate 51 above the screen mounting slots 53. The screen 55 is inserted into the screen mounting groove 53 having an L-shaped cross section, and the locking screws 54 are rotated to make the locking screws 54 contact and hold the screen 55, thereby fixing the screen 55.

In order to further optimize the technical scheme, slide rails are fixed on two sides of the upper surface of the screen fixing plate 51, pulleys matched with the slide rails are arranged at the left end and the right end of a scraper seat assembly 65 of the high-precision screen printing pressure mechanism 6, the scraper seat assembly is slidably connected with the screen fixing plate 51 through the slide rails to slide in the same direction with the feeding and discharging sliding table 7, and the scraper 66 and the ink return knife 67 can move back and forth on the screen printing screen.

The working method of the screen printing device comprises the following specific steps:

s1: loading the screen 55 into a screen mounting slot 53 corresponding to the screen printing machine and locking and fixing the screen by rotating a locking and fixing screw 54;

s2: after the screen printing device is ventilated and electrified, the screen printing device is started, and the high-precision screen printing pressure mechanism returns to the original point;

s3: loading the positioning substrate onto a screen printing platform 3, and dropwise adding screen printing ink above the screen printing plate; positioning a substrate as a recycled transparent PET module;

s4: the screen printing device is automatically/manually positioned by visual alignment, wherein the optical coordinate positioning instrument 42 is used for positioning, and the feeding and discharging sliding table 7 slides to perform alignment, so that the area to be printed of the positioning substrate is aligned and overlapped with the screen printing area of the screen 55;

s5: loading a workpiece to be silk-screened onto a silk-screening platform 3, automatically and visually aligning and positioning the workpiece to be silk-screened with an optical visual positioning mechanism 5 of a screen printing device, aligning the workpiece to be silk-screened with a silk-screening area of a screen 55, rapidly moving the silk-screening platform 3 to the position below the screen 55, and starting silk-screening;

s6: the ink returning knife 67 moves to a lower station close to the upper surface of the screen 55 and moves back and forth, the silk-screen printing ink on the upper surface of the screen 55 is flattened, and the screen is returned to the preparation station through the lifting cylinder 621;

s7: the scraper 66 moves to a lower station, contacts the screen 55 under the action of a scraper counterweight mechanism 63, and moves back and forth to print the silk-screen printing ink on the surface of the substrate through the screen 55;

s8: after the scraper 66 finishes the moving action, the screen printing platform 3 returns to the preparation station through the return mechanism 64, and the screen printing plate 55 is rapidly moved out of the lower part of the screen printing plate loading plane 5 through the feeding and discharging sliding table 7 and is moved to the front part of the feeding and discharging station 2;

s9: and (4) taking out the substrate which is subjected to silk screen printing on the silk screen printing platform 3 automatically or manually, putting the good product into the good product area, putting the NG product into the NG product area, and repeating the steps from S5 to S9. The automatic taking-out of the substrate can be realized by utilizing a manipulator to automatically control the taking and placing.

Examples

1. Loading the screen printing plate into the screen printing plate mounting clamping groove and locking and fixing the screen printing plate by rotating locking and fixing screws;

2. mounting the ink return knife to the mounting position of the scraper seat component, and enabling the ink return knife to be flush with the surface of the screen;

3. the scraper is rotatably connected and installed to the installation position of the scraper seat component through a rotating connecting shaft 635, the scraper surface is kept to be flush with the screen surface through fine adjustment of a horizontal adjusting screw 634, the left and right horizontal adjusting screws 634 are fine adjusted, and the rotating connecting shaft 635 is matched to align the scraper 66 with the screen printing platform 3 in parallel;

4. adjusting the scraper balancing weight according to the requirement of the screen printing pressure, when the requirement of the screen printing pressure is lower, such as 20N, selecting a scraper balancing weight of 50N, and adjusting the fine adjustment balancing weight leftwards and rightwards through a balance weight fine adjustment structure so as to achieve the purpose that the actual force applied by a scraper to a screen printing plate is 20N, accurately controlling and achieving low-pressure screen printing;

5. adjusting the weight of the ink returning blade balancing weight until the force applied by the ink returning blade to the silk screen is 10N, so as to achieve the ink returning effect;

6. fixing a workpiece to be silk-screened on the upper feeding sliding table and the lower feeding sliding table, arranging a positioning hole on the workpiece to be silk-screened, optically positioning the workpiece to be silk-screened by a CCD camera according to the positioning hole, overlapping a silk-screen pattern of a silk-screen plate with a silk-screen pattern required by the workpiece to be silk-screened, automatically adjusting the workpiece to be silk-screened to a specified position through an automatic alignment structure of the upper feeding sliding table and the lower feeding sliding table according to positioning acquisition data, aligning, and then starting silk-screen printing (firstly testing printing and then normally producing.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a multi-functional accurate half tone printing device of low printing pressure which characterized in that includes: the screen printing machine comprises a machine body, a feeding and discharging station, a screen printing platform, an optical visual positioning mechanism, a screen printing plate loading plane, a high-precision screen printing pressure mechanism and a feeding and discharging sliding table, wherein the feeding and discharging station, the screen printing platform, the optical visual positioning mechanism, the screen printing plate loading plane, the high-precision screen printing pressure mechanism;

the feeding and discharging station and the screen printing platform are positioned below the screen printing plate loading plane;

the high-precision screen printing pressure mechanism is arranged above the screen loading plane and is in sliding connection with the screen loading plane; the optical vision positioning mechanism is arranged on the edge of the loading plane of the screen printing plate and is positioned above the feeding and discharging station; and the feeding and discharging sliding table is installed below the screen loading plane and connected with the screen printing platform to control the screen printing platform to linearly move on the upper plane of the feeding and discharging station.

2. The multifunctional low-printing-pressure precise screen printing device according to claim 1, wherein the screen loading plane comprises a screen fixing plate and a plurality of marble supporting columns, the marble supporting columns are fixedly arranged at corners of the bottom surface of the screen fixing plate, and support the screen fixing plate to be horizontally balanced; the screen is fixed on the bottom surface of the screen fixing plate.

3. The multifunctional low-printing-pressure precise screen printing device according to claim 2, wherein the high-precision screen printing pressure mechanism comprises a balance weight fine adjustment mechanism, a ink return blade connecting mechanism, a scraper balance weight hammer mechanism, a return mechanism, a scraper seat assembly, a scraper and an ink return blade;

the balance weight balance fine adjustment mechanism, the ink return knife connecting mechanism, the scraper balance weight hammer mechanism and the return mechanism are arranged on the scraper seat assembly;

the scraper is arranged on one side, close to the screen fixing plate, of the scraper counterweight mechanism; the ink return knife is arranged on one side of the ink return knife connecting mechanism close to the screen fixing plate.

4. The multifunctional low-printing-pressure precise screen printing device according to claim 1, wherein the feeding and discharging station is provided with two sets of slide rails, the feeding and discharging sliding table is mounted on the slide rails, the screen printing platform is mounted on the feeding and discharging sliding table, and the feeding and discharging sliding table drives the screen printing platform to slide in the feeding and discharging station.

5. The multifunctional low-printing-pressure precise screen printing device according to claim 3, wherein the return mechanism comprises a cylinder, a top rod and a balance rod; the cylinder and the ejector rod are connected and arranged at one end of the balancing rod; the balance rod is rotatably connected to a support and rotating seat fixedly arranged on the scraper seat assembly through a rotating shaft; the air cylinder drives the balance rod to do lever motion by pushing the ejector rod, and the free end of the balance rod moves up and down.

6. The multifunctional low-printing-pressure precise screen printing device according to claim 5, wherein the scraper counterweight hammer mechanism is mounted in front of the supporting and rotating seat, and the ink return blade connecting mechanism is mounted between the supporting and rotating seat and the return mechanism; the balance weight balance fine adjustment mechanism is arranged at the end of the balance rod where the return mechanism is arranged, the balance weight balance fine adjustment mechanism comprises a screw rod and a fine adjustment balancing weight matched and rotatably connected with the screw rod, the screw rod is inserted into the end of the balance rod, and the fine adjustment balancing weight is arranged on the screw rod in a penetrating mode.

7. The multifunctional low printing pressure precision screen printing device according to claim 5, wherein the scraper counterweight mechanism comprises a scraper counterweight and a scraper connecting piece, and the ink return blade connecting mechanism comprises a lifting cylinder and an ink return blade connecting piece; the upper parts of the scraper connecting piece and the ink return knife connecting piece are respectively and fixedly provided with the scraper balancing weight and the lifting cylinder, the lower parts of the scraper connecting piece and the ink return knife connecting piece are respectively and fixedly provided with the scraper and the ink return knife, the other ends of the scraper and the ink return knife are contacted with the screen printing plate, and the contact pressure between the scraper and the ink return knife and the screen printing plate is controlled through the quality control of the scraper balancing weight and the lifting distance of the lifting cylinder; the middle part of the scraper connecting piece is of a hollow structure, a pulley is fixedly mounted at the upper part of the hollow structure, and the pulley is in contact with the upper surface of the free end of the balance rod.

8. The multifunctional low-printing-pressure precise screen printing device according to claim 1, further comprising a protective cover, wherein the protective cover is buckled with the machine body to seal the feeding and discharging station, the screen printing platform, the optical vision positioning mechanism, the screen printing plate loading plane, the high-precision screen printing pressure mechanism and the feeding and discharging sliding table.

9. The multifunctional low-printing-pressure precise screen printing device according to claim 1, wherein the optical vision positioning mechanism comprises a right-angle bracket and two groups of optical coordinate positioning instruments; the right-angle support is fixedly installed on the side edge of the screen loading plane, the two groups of optical coordinate positioning instruments are respectively installed on the two right-angle edges of the right-angle support, and the optical coordinate positioning instruments vertically align with the feeding and discharging stations.

10. The multifunctional low-printing-pressure precise screen printing device according to claim 2, wherein screen mounting slots are formed in the inner sides of the marble pillars on both sides of the lower surface of the screen fixing plate, and a plurality of locking fixing screws are arranged on the screen fixing plate above the screen mounting slots in a penetrating manner.

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