A screen printing machine

Abstract

The present invention discloses a screen printing machine, which relates to the technical field of printing equipment, including a machine platform, wherein the top of the machine platform and the side end of the fixed plate are provided with a pneumatic component, the interior of the pneumatic component is provided with a clamping component, and the side end of the scraper plate is provided with a blanking component. The present invention provides a rotating disk driven by air pressure, and with each downward pressure of the scraper plate, the unprinted objects above the rotating disk will be transported to the bottom of the screen, thereby effectively improving the working efficiency of the equipment. At the same time, when the scraper plate is pressed down each time, the air pressure generated will drive the support plate to center and clamp, and push the object to be printed to be straightened, thereby reducing the error rate during printing and indirectly improving the printing efficiency of the equipment. A blanking component driven synchronously by air pressure is then provided, and the air pressure generated by each downward pressure will drive the extrusion block to extrude the ink pad, thereby regularly replenishing the ink pad onto the screen, reducing the time for manual ink pad replenishment of the equipment and improving the working efficiency of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of printing equipment, in particular to a screen printing machine. Background Art

[0002] A screen printing machine is a machine that uses a silk screen printing plate to print. It is a type of printing press. A screen printing machine is a machine that prints text and images. It is a general term for machines or equipment used to produce printed products. A screen printing machine is a more representative printing equipment among stencil printing presses. In addition to silk, the materials used to make the screen can also be nylon wire, copper wire, steel wire or stainless steel wire.

[0003] However, the screen printing machine of the prior art still has the following defects to be solved:

[0004] 1. Existing screen printing machines require manual feeding and unloading of materials. That is, before the printing machine starts working, the object to be printed needs to be placed under the screen. After printing is completed, the object needs to be removed manually. In the long run, manual handling will not only cause manual fatigue, but also reduce the working efficiency of the equipment. In addition, manual handling cannot guarantee the accuracy of the object placement, and the placement position will be offset, thereby reducing the quality of the printed product. Manual calibration of the object position will also affect the printing efficiency of the equipment.

[0005] 2. After the existing screen printing machine has been working for a period of time, it is necessary to stop the equipment first, then manually apply ink pad to the screen, and then restart the equipment. This loading method will greatly reduce the printing efficiency of the equipment;

[0006] Therefore, in order to solve the above-mentioned problem of printing efficiency, we provide a screen printing machine. Summary of the Invention

[0007] The purpose of the present invention is to provide a screen printing machine to solve the problem that the existing screen printing machine manually discharges materials and adds ink, which is time-consuming and cumbersome to operate and greatly reduces the printing efficiency of the equipment.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a screen printing machine, comprising a machine table, a fixed table plate vertically fixed to a side end of the top of the machine table, a sliding table vertically sliding on a side end of the fixed table plate, a scraping plate horizontally sliding on a side end of the sliding table, and a screen vertically fixed to the bottom of the sliding table, the top of the machine table and the side end of the fixed table plate are provided with a pneumatic assembly, a clamping assembly is provided inside the pneumatic assembly, a blanking assembly is provided on a side end of the scraping plate, and the pneumatic assembly includes a push rod, an air cylinder, a sealing groove, a piston, a rack unit, a driving member, a rotating shaft, a gear ring, a rotating disk and a positioning plate;

[0009] The cam is fixed on the top of the sliding table, and the air cylinder is fixed on the side end of the fixed table horizontally, and the sliding push rod can be vertically inserted into the air cylinder, and the sealing groove is opened in the interior of the machine and is connected with the bottom of the air cylinder. The piston and the rack unit are slidably distributed in the sealing groove, and the piston is horizontally fixed on the side end of the rack unit. The driving member is vertically installed in the interior of the machine, and the driving member is composed of a cylindrical block and two gears spliced ​​end to end, and the gear located below is meshed with the rack unit. The rotating shaft vertically passes through the top of the machine and passes through the sealing groove. The gear ring is sleeved on the top side of the rotating shaft and meshes with the gear structure at the top of the driving member. The rotating disk is vertically fixed on the top of the rotating shaft. The number of the positioning plates is several, and they are evenly fixed on the top of the rotating disk in a circumferential manner.

[0010] By setting up a rotating disk driven by air pressure, with each downward pressure of the scraper plate, the air pressure generated by the push rod squeezing the air cylinder will drive the rotating disk to rotate, thereby rotating the positioning plate above the rotating disk, and immediately transporting the unprinted objects to the bottom of the screen, effectively improving the working efficiency of the equipment.

[0011] As a further solution of the present invention: the clamping assembly includes an L-shaped groove, a vent groove and a supporting plate;

[0012] The L-shaped groove is opened inside the piston, the ventilation groove is opened inside the rotating shaft, the rotating disk and the positioning plate, the supporting plate is horizontally distributed on both sides of the top of the positioning plate, and the side ends of the supporting plate are slidably distributed inside the ventilation groove.

[0013] By providing a support plate linked to the pneumatic component, each time the scraper plate is pressed down, the air pressure generated by the push rod squeezing the air cylinder will drive the support plate to center and clamp, pushing the object to be printed into place, thereby facilitating the screen to print the object. This linkage structure can more effectively improve the working efficiency of the equipment.

[0014] As a further solution of the present invention: the discharge assembly includes a storage box, a discharge pipe, an air ventilation hose and an extrusion block; the storage box is horizontally fixed to the side end of the sliding table, the discharge pipe is vertically fixed to the bottom of the storage box, and is connected with the storage box, the air ventilation hose is distributed between the discharge pipe and the air cylinder, and the two ends of the air ventilation hose are respectively connected with the side end of the discharge pipe and the bottom side of the air cylinder, and the extrusion block is slidably distributed inside the side end of the air ventilation hose connected to the discharge pipe.

[0015] By setting up a material discharge component that is also driven by air pressure, the air pressure generated by each downward pressure will drive the extrusion block to squeeze the ink pad, thereby regularly replenishing the ink pad to the silk screen, ensuring that the operation of the equipment will not be affected by lack of material.

[0016] As a further solution of the present invention: the rack unit includes a straight bar, gear teeth and a spring plate, the straight bar is slidably distributed inside the sealing groove, the number of the gear teeth is several and is evenly distributed on the side ends of the straight bar in the horizontal direction, and is rotatably connected to the straight bar, and the spring plate is horizontally fixed between the straight bar and the gear teeth.

[0017] By providing a one-way driven rack unit, it is ensured that the rack can drive the rotating disk to rotate and feed. When the rack is reset, the reverse movement will not affect the operation of the rotating disk, thereby ensuring the perfection of the pneumatic component function.

[0018] As a further solution of the present invention: the gear teeth are linearly distributed in an area of ​​two-thirds of the side end of the straight bar.

[0019] By setting the blank space at the side end of the straight bar according to the distance between the driving member and the rotating shaft, the cost of the factory when producing the rack unit is effectively reduced.

[0020] As a further solution of the present invention: one side of the gear teeth is a bevel structure.

[0021] By providing a gear tooth structure with an inclined surface, the gear teeth are ensured to be driven in one direction. At the same time, when the rack unit moves in the reverse direction, the inclined surface structure of the gear teeth will also reduce the friction between it and the driving part, thereby enhancing the stability of the rack unit during operation.

[0022] As a further solution of the present invention: a protruding structure is provided on the inner wall of the connection between the air vent hose and the discharge pipe to limit the sliding range of the extrusion block.

[0023] The protruding structure is provided to limit the extrusion block, thereby preventing the extrusion block from slipping out of the air vent hose due to excessive stroke, thereby ensuring that the extrusion block can work stably.

[0024] As a further solution of the present invention: a diversion pipe is vertically fixed to the bottom of the feed pipe, and the feed pipe and the diversion pipe are connected to each other.

[0025] By providing a diversion pipe, the ink flowing above the screen can be divided into smaller parts so that it can be more even when it reaches the screen surface, thereby effectively ensuring the quality of the printed product.

[0026] As a further solution of the present invention: movable valves are distributed at the bottom of the gas cylinder. There are two movable valves, which are rotatably installed on the outer side and the inner side of the two openings at the bottom of the gas cylinder respectively.

[0027] By setting up two counter-rotating movable valve structures, one is responsible for air outlet and the other is responsible for air intake, and the two cannot work at the same time, the air pressure inside the air cylinder is maintained to ensure the rationality of the equipment during operation.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] By setting up a rotating disk driven by air pressure, each time the scraper plate is pressed down, the push rod will be driven to press the air cylinder downward, thereby generating air pressure to drive the rotating disk to rotate, and the unprinted objects above the rotating disk are transported to the bottom of the screen. Different from manual feeding and taking of materials each time, this component effectively improves the working efficiency of the equipment. At the same time, each time the scraper plate is pressed down, the air pressure generated will drive the support plate to center and clamp, and push the object to be printed to be straightened, so as to facilitate the screen to print the object, reduce the error rate during printing, and indirectly improve the printing efficiency of the equipment. A feeding component driven synchronously by air pressure is set up. The air pressure generated by each downward pressure will drive the extrusion block to extrude the ink, thereby regularly replenishing the ink on the screen, reducing the time for manual replenishment of ink, and improving the working efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 This is a cross-sectional view of the machine structure of the present invention;

[0032] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in the middle;

[0033] Figure 4 A cross-sectional view of the rotating disk structure of the present invention;

[0034] Figure 5 This is a cross-sectional view of the positioning plate structure of the present invention;

[0035] Figure 6 It is a cross-sectional view of the gas cylinder structure of the present invention;

[0036] Figure 7 It is a schematic structural diagram of the blanking assembly of the present invention;

[0037] Figure 8 Schematic diagram of the rack unit structure of the present invention.

[0038] In the figure: 1. Machine table; 2. Fixed table; 3. Sliding table; 4. Scraper plate; 5. Silk screen; 6. Pneumatic component; 601. Push rod; 602. Air cylinder; 603. Sealing groove; 604. Piston; 605. Rack unit; 6051. Straight bar; 6052. Gear teeth; 6053. Shrapnel; 606. Driving member; 607. Rotating shaft; 608. Gear ring; 609. Rotating disk; 610. Positioning plate; 7. Clamping assembly; 701. L-shaped groove; 702. Ventilation groove; 703. Support plate; 8. Unloading assembly; 801. Storage box; 802. Unloading pipe; 803. Air hose; 804. Extrusion block; 805. Diverter pipe; 9. Movable valve. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or connected in one piece; they can be mechanically connected or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an embodiment of the present invention based on its overall structure.

[0041] See also Figures 1 to 8In an embodiment of the present invention, a screen printing machine includes a machine table 1, a fixed table 2 vertically fixed to the top side end of the machine table 1, a sliding table 3 vertically sliding on the side end of the fixed table 2, a scraper plate 4 horizontally sliding on the side end of the sliding table 3, and a screen 5 vertically fixed to the bottom of the sliding table 3. A pneumatic component 6 is provided at the top of the machine table 1 and the side end of the fixed table 2. A clamping component 7 is provided inside the pneumatic component 6. A blanking component 8 is provided at the side end of the scraper plate 4. The pneumatic component 6 includes a push rod 601, an air cylinder 602, a sealing groove 603, a piston 604, a rack unit 605, a driving member 606, a rotating shaft 607, a gear ring 608, a rotating disk 609 and a positioning plate 610.

[0042] The push rod 601 is vertically fixed to the bottom of the sliding table 3, the air cylinder 602 is horizontally fixed to the side end of the fixed table 2, and the sliding push rod 601 can be vertically inserted into the air cylinder 602. The sealing groove 603 is opened inside the machine 1 and is connected to the bottom of the air cylinder 602. The piston 604 and the rack unit 605 are slidably distributed inside the sealing groove 603. The piston 604 is horizontally fixed to the side end of the rack unit 605. The driving member 606 is vertically installed inside the machine 1. The driving member 606 is installed vertically inside the machine 1. 06 is composed of a cylindrical block and two gears spliced ​​end to end, and the gear located at the bottom is engaged with the rack unit 605. The rotating shaft 607 vertically passes through the top of the machine 1 and passes through the inside of the sealing groove 603. The gear ring 608 is sleeved on the top side of the rotating shaft 607 and engages with the gear structure on the top of the driving member 606. The rotating disk 609 is vertically fixed to the top of the rotating shaft 607. There are several positioning plates 610, which are evenly fixed on the top of the rotating disk 609 in a circular shape.

[0043] In this embodiment, it should be noted that the fixed table 2 and the sliding table 3 are both internally provided with motors for driving the sliding table 3 and the scraping plate 4 to move.

[0044] Before starting the printing process, the user first places the object to be printed on the top of the positioning plate 610, and starts the entire device at the same time. The scraper plate 4 first slides horizontally along the top of the sliding table 3 to adjust its position, and the sliding table 3 then slides vertically along the fixed table 2, thereby driving the scraper plate 4 to move downward to squeeze the screen 5, causing the screen 5 to fit the object to be printed. At the same time, the scraper plate 4 slides back and forth horizontally along the top of the sliding table 3, squeezing the surface of the screen 5, thereby printing the ink on the screen 5 onto the surface of the object according to the pattern set on the screen 5; while the sliding table 3 moves downward, it will drive the push rod 601 to move vertically. Insert the air cylinder 602 and continue to squeeze downward to generate high air pressure. The air pressure reaches the side end of the piston 604 along the sealing groove 603 and squeezes the piston 604, thereby pushing the piston 604 and the rack unit 605 to translate. The translated rack unit 605 drives the driving member 606 engaged with it. The driving member 606 rotates, driving the gear ring 608 and the rotating disk 609 to rotate, thereby rotating and removing the printed object above the positioning plate 610 above the rotating disk 609, and rotating the rotating disk 609 with the unprinted object to the bottom of the screen 5. This reciprocating process is repeated without stopping to complete the printing work.

[0045] Please refer to Figures 1 to 5 , the clamping assembly 7 includes an L-shaped groove 701, a vent groove 702 and a supporting plate 703;

[0046] The L-shaped groove 701 is opened inside the piston 604, the ventilation groove 702 is opened inside the rotating shaft 607, the rotating disk 609 and the positioning plate 610, the support plate 703 is horizontally distributed on both sides of the top of the positioning plate 610, and the side ends of the support plate 703 are slidably distributed inside the ventilation groove 702.

[0047] In this embodiment: when the air pressure pushes the piston 604 to move horizontally, when the piston 604 moves completely to the bottom of the rotating shaft 607, the L-shaped groove 701 inside the piston 604 is aligned with the bottom of the ventilation groove 702, so that the air pressure in the sealing groove 603 moves from the L-shaped groove 701 to the ventilation groove 702, and then to the inside of the positioning plate 610, thereby pushing the two supporting plates 703 on the top side of the positioning plate 610 to move in the center, squeezing and adjusting the object on the top of the positioning plate 610, so that the position is more accurately printed by the screen 5.

[0048] Please refer to Figures 1 to 2 、 Figure 7The material discharge assembly 8 includes a material storage box 801, a material discharge pipe 802, an air ventilation hose 803 and an extrusion block 804; the material storage box 801 is horizontally fixed to the side end of the sliding platform 3, the material discharge pipe 802 is vertically fixed to the bottom of the material storage box 801, and is connected with the material storage box 801, the air ventilation hose 803 is distributed between the material discharge pipe 802 and the air cylinder 602, and the two ends of the air ventilation hose 803 are respectively connected with the side end of the material discharge pipe 802 and the bottom side of the air cylinder 602, and the extrusion block 804 is slidably distributed inside the side end where the air ventilation hose 803 is connected to the material discharge pipe 802.

[0049] In this embodiment, it should be noted that the ink pad itself has a certain fluidity, but due to its high viscosity and density, it is in a slow-flowing state.

[0050] The user first places the ink pad inside the storage box 801 in advance. When the push rod 601 is vertically inserted into the air cylinder 602 and continues to press down, part of the generated air pressure will enter from the inside of the air hose 803 and push the extrusion block 804 located at its side end to move horizontally. The moving extrusion block 804 will squeeze the ink pad inside the discharge pipe 802, so that when the scraper plate 4 moves downward, the ink pad will flow to the top of the screen 5, replenishing the ink pad immediately.

[0051] Please refer to Figures 2 to 4 、 Figure 8 The rack unit 605 includes a straight bar 6051, gear teeth 6052 and a spring piece 6053. The straight bar 6051 is slidably distributed inside the sealing groove 603. The number of gear teeth 6052 is several and is evenly distributed on the side ends of the straight bar 6051 along the horizontal direction. They are rotatably connected to the straight bar 6051. The spring piece 6053 is horizontally fixed between the straight bar 6051 and the gear teeth 6052.

[0052] When the push rod 601 is vertically inserted into the interior of the air cylinder 602 and continues to press down, the air pressure generated will push the rack unit 605 to move horizontally, thereby driving the driving member 606 engaged therewith to rotate. When the push rod 601 stops pressing down and moves up again to reset, the push rod 601 will pull upward along the inside of the air cylinder 602, thereby generating negative pressure, driving the rack unit 605 to reset in the opposite direction. At this time, the gear teeth 6052 located at the side end of the straight bar 6051 contact the driving member 606 in the opposite direction, and the gear teeth 6052 will rotate, thereby releasing the engagement with the driving member 606. Therefore, when the rack unit 605 resets, it will not drive the driving member 606 to rotate, and when the rotating gear teeth 6052 lose contact with the driving member 606, it will be pushed by the extension of the spring piece 6053 to fold back and reset again, so as to facilitate its normal operation next time.

[0053] Please refer to Figures 2 to 4 、 Figure 8The gear teeth 6052 are linearly distributed in the two-thirds area of ​​the side end of the straight bar 6051.

[0054] In this embodiment, when the straight bar 6051 is pushed and translated until the top of the piston 604 is aligned with the bottom of the rotating shaft 607, the gear teeth 6052 located at the end distance between the driving member 606 and the rotating shaft 607 will not play any role. Therefore, a blank structure is left at the side end of the straight bar 6051 without the gear teeth 6052 installed to save material.

[0055] Please refer to Figure 8 , one side of the gear tooth 6052 is a bevel structure.

[0056] In this embodiment, one side of the gear tooth 6052 is a bevel structure, which is used to ensure that the gear tooth 6052 is a one-way structure. At the same time, when the rack unit 605 moves in the reverse reset direction, the bevel structure of the gear tooth 6052 will also reduce the friction between it and the driving member 606.

[0057] Please refer to Figure 7 A raised structure is provided on the inner wall of the connection between the air hose 803 and the discharge pipe 802 to limit the sliding range of the extrusion block 804.

[0058] In this embodiment: when the air pressure pushes the extrusion block 804 located at its side end to move horizontally, when the extrusion block 804 moves to the side end of the air hose 803, it will be stopped and limited by the protruding structure, thereby preventing the extrusion block 804 from slipping out of the inside of the air hose 803.

[0059] Please refer to Figure 7 A diversion pipe 805 is vertically fixed to the bottom of the discharge pipe 802, and the discharge pipe 802 and the diversion pipe 805 are interconnected.

[0060] In this embodiment, when the ink in the discharge pipe 802 is squeezed out from the diversion pipe 805 , it is divided into several small strands of ink, which are then more evenly distributed on the surface of the screen 5 .

[0061] Please refer to Figure 6 There are two movable valves 9 at the bottom of the air cylinder 602, and they are rotatably installed on the outside and inside of the two openings at the bottom of the air cylinder 602 respectively.

[0062] In this embodiment: when the push rod 601 is vertically inserted into the interior of the air cylinder 602 and continues to press downward, the air pressure will push the movable valve 9 located on the outside of the bottom of the air cylinder 602, causing it to rotate, thereby introducing the high-pressure airflow into the interior of the sealing groove 603; similarly, when the push rod 601 is located inside the air cylinder 602 and pulled upward and outward, the movable valve 9 located on the inside of the bottom of the air cylinder 602 will rotate, introducing the airflow into the interior of the air cylinder 602, thereby ensuring that there is enough air inside the air cylinder 602 to generate pressure.

[0063] Working principle: The user places the object to be printed on the top of the positioning plate 610 and starts the entire device at the same time. The scraper plate 4 first slides horizontally along the top of the sliding table 3 to adjust its position, and the sliding table 3 then slides vertically along the fixed table 2, thereby driving the scraper plate 4 to move down and squeeze the screen 5, causing the screen 5 to fit the object to be printed. At the same time, the scraper plate 4 slides back and forth horizontally along the top of the sliding table 3, squeezing the surface of the screen 5, thereby printing the ink on the screen 5 onto the surface of the object according to the pattern set on the screen 5. As the sliding table 3 moves down, it will drive The push rod 601 is vertically inserted into the interior of the air cylinder 602 and continues to squeeze downward, thereby generating high air pressure. The air pressure reaches the side end of the piston 604 along the sealing groove 603 and squeezes the piston 604, thereby pushing the piston 604 and the rack unit 605 to translate. The translated rack unit 605 drives the driving member 606 engaged with it. The driving member 606 rotates, driving the gear ring 608 and the rotating disk 609 to rotate, thereby rotating and removing the printed object above the positioning plate 610 above the rotating disk 609, and rotating the rotating disk 609 with the unprinted object to the screen. 5, and so on and so forth, can ensure that the screen 5 is lowered for printing while the rotating disk 609 switches printing, ensure the consistency of the whole printing, and improve the printing efficiency; when the air pressure pushes the piston 604 to move horizontally to the bottom of the rotating shaft 607, the L-shaped groove 701 inside the piston 604 is aligned with the bottom of the ventilation groove 702, so that the air pressure in the sealing groove 603 is transferred from the L-shaped groove 701 to the ventilation groove 702, and then to the inside of the positioning plate 610, thereby pushing the two supporting plates 703 on the top side of the positioning plate 610 to move in the center, and the object on the top of the positioning plate 610 is moved. The parts are squeezed and positioned to ensure that the position is more accurately printed on the silk screen 5, without the need for manual calibration of the object position, and the printing effect and processing efficiency are effectively improved; and when the push rod 601 is vertically inserted into the interior of the air cylinder 602 and continues to press down, a part of the generated air pressure will enter from the inside of the air hose 803, and push the squeezing block 804 at its side end to move horizontally, and the moving squeezing block 804 will squeeze the ink pad located inside the discharge pipe 802, so that when the scraper plate 4 moves downward, the ink pad will flow to the top of the silk screen 5, and the ink pad will be replenished immediately. The process does not require manual replenishment of ink pad, and the processing efficiency is further improved.

[0064] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A screen printing machine, comprising a machine platform (1), a fixed table (2) vertically fixed to the top side of the machine platform (1), a sliding table (3) vertically sliding on the side of the fixed table (2), a scraper (4) horizontally sliding on the side of the sliding table (3), and a screen (5) vertically fixed to the bottom of the sliding table (3), characterized in that: A pneumatic component (6) is provided on the top of the machine (1) and the side end of the fixed table (2); A clamping assembly (7) is provided inside the pneumatic assembly (6); A blanking assembly (8) is provided at the side end of the scraper plate (4); The pneumatic assembly (6) includes a push rod (601), an air cylinder (602), a sealing groove (603), a piston (604), a rack unit (605), a driving member (606), a rotating shaft (607), a gear ring (608), a rotating disk (609) and a positioning plate (610); The push rod (601) is vertically fixed to the bottom of the sliding table (3), the air cylinder (602) is horizontally fixed to the side end of the fixed table (2), and the sliding push rod (601) can be vertically inserted into the inside of the air cylinder (602). The sealing groove (603) is opened in the inside of the machine (1) and is connected to the bottom of the air cylinder (602). The piston (604) and the rack unit (605) are slidably distributed in the inside of the sealing groove (603). The piston (604) is horizontally fixed to the side end of the rack unit (605), and the driving member (606) is vertically installed on the machine (1). The driving member (606) is composed of a cylindrical block and two gears connected end to end, and the gear located at the bottom is engaged with the rack unit (605). The rotating shaft (607) vertically passes through the top of the machine (1) and passes through the inside of the sealing groove (603). The gear ring (608) is sleeved on the top side of the rotating shaft (607) and is engaged with the gear structure on the top of the driving member (606). The rotating disk (609) is vertically fixed to the top of the rotating shaft (607). There are several positioning plates (610) and they are evenly fixed on the top of the rotating disk (609) in a circular shape.

2. A screen printing machine according to claim 1, characterized in that: The clamping assembly (7) comprises an L-shaped groove (701), a venting groove (702) and a supporting plate (703); The L-shaped groove (701) is opened inside the piston (604), the ventilation groove (702) is opened inside the rotating shaft (607), the rotating disk (609) and the positioning plate (610), the supporting plate (703) is horizontally distributed on both sides of the top of the positioning plate (610), and the side ends of the supporting plate (703) are slidably distributed inside the ventilation groove (702).

3. The screen printing machine according to claim 1, characterized in that: The material discharge assembly (8) includes a material storage box (801), a material discharge pipe (802), an air vent hose (803) and an extrusion block (804); the material storage box (801) is horizontally fixed to the side end of the sliding platform (3), the material discharge pipe (802) is vertically fixed to the bottom of the material storage box (801) and is connected to the material storage box (801), the air vent hose (803) is distributed between the material discharge pipe (802) and the gas cylinder (602), and the two ends of the air vent hose (803) are respectively connected to the side end of the material discharge pipe (802) and the bottom side of the gas cylinder (602), and the extrusion block (804) is slidably distributed inside the side end of the air vent hose (803) connected to the material discharge pipe (802).

4. The screen printing machine according to claim 1, characterized in that: The rack unit (605) includes a straight bar (6051), gear teeth (6052) and a spring piece (6053). The straight bar (6051) is slidably distributed inside the sealing groove (603). The number of the gear teeth (6052) is several and evenly distributed along the horizontal direction at the side ends of the straight bar (6051) and is rotatably connected to the straight bar (6051). The spring piece (6053) is horizontally fixed between the straight bar (6051) and the gear teeth (6052).

5. The screen printing machine according to claim 4, characterized in that: The gear teeth (6052) are linearly distributed in an area of ​​two-thirds of the side end of the straight bar (6051).

6. The screen printing machine according to claim 4, characterized in that: One side of the gear teeth (6052) is a bevel structure.

7. The screen printing machine according to claim 3, characterized in that: A raised structure is provided on the inner wall of the connection between the air vent hose (803) and the discharge pipe (802) to limit the sliding range of the extrusion block (804).

8. The screen printing machine according to claim 3, characterized in that: A diversion pipe (805) is vertically fixed to the bottom of the feed pipe (802), and the feed pipe (802) and the diversion pipe (805) are interconnected.

9. The screen printing machine according to claim 1, characterized in that: The bottom of the gas cylinder (602) is provided with movable valves (9). There are two movable valves (9) which are rotatably mounted on the outer side and the inner side of the two openings at the bottom of the gas cylinder (602).

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