A printing device for plastic bag processing

Abstract

This utility model relates to the field of plastic bag processing and discloses a printing device for plastic bag processing. It includes a frame, a conveying assembly mounted on the frame for horizontally conveying plastic bags, a vertical frame fixed to the back of the frame, a screen printing assembly slidably mounted on the vertical frame, and a cylinder driving the screen printing assembly to move up and down. A pair of connecting frames are symmetrically mounted on the frame, each connecting frame having a rotating shaft rotatably connected to it. A gear located behind the connecting frame and a pressure plate located inside the connecting frame are fixed on the rotating shaft. This utility model has the following advantages and effects: The plastic bags to be printed are placed on the conveying assembly, which then starts to deliver the plastic bags one by one to the bottom of the screen printing assembly. When the cylinder drives the screen printing assembly to move down, the rack and pinion plate meshes with the gear, causing it to rotate. This causes the pressure plate to rotate inward synchronously, pressing the edge of the plastic bag, effectively counteracting the offset caused by vibration or tension during the printing process, improving the printing effect, and ensuring a stable yield.

Description

Technical Field

[0001] This utility model relates to the field of plastic bag processing technology, and in particular to a printing device for plastic bag processing. Background Technology

[0002] Plastic bags are an essential item in people's daily lives, often used to pack other items. They are widely used because of their low price, light weight, large capacity, and ease of storage. Currently, in the plastic bag production process, it is often necessary to print and code the plastic bags to ensure that the plastic bags have the trademarks and barcodes required by the manufacturer.

[0003] The surface of plastic bags needs to be precisely printed with trademarks, barcodes, production dates, and other information to achieve traceability, brand display, and automated sorting. Traditional printing relies on manual positioning of the corners of plastic bags, which is not only cumbersome but also prone to misalignment due to the low surface energy of plastic film caused by electrostatic adsorption or mechanical vibration, resulting in defects such as blurry printing and ghosting, making it difficult to maintain a stable yield. Therefore, we propose a printing device for plastic bag processing. Utility Model Content

[0004] The purpose of this invention is to provide a printing device for processing plastic bags, which has the effect of convenient positioning and improved printing quality.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a printing device for processing plastic bags, including a frame, a conveying assembly for conveying plastic bags horizontally mounted on the frame, a stand fixed on the back of the frame, a screen printing assembly slidably mounted on the stand, and a cylinder for driving the screen printing assembly to move up and down. A pair of connecting frames are symmetrically mounted on the frame, and a rotating shaft is rotatably connected to each connecting frame. A gear located on the rear side of the connecting frame and a pressure plate located on the inner side of the connecting frame are fixed on the rotating shaft. The screen printing assembly has rack plates on both sides that mesh with the corresponding gears.

[0006] By adopting the above technical solution, the plastic bags to be printed are placed on the conveying assembly. Then, the conveying assembly is activated to send the plastic bags one by one to the bottom of the screen printing assembly. When the cylinder drives the screen printing assembly to move down, the rack and pinion plate meshes with the gear to rotate, causing the pressure plate to rotate inward synchronously to press the edge of the plastic bag. This effectively counteracts the offset caused by vibration or tension during the printing process, improves the printing effect, and stabilizes the yield rate. The conveying assembly sends the plastic bags one by one to the printing position. By using the same power source (cylinder) to convert the vertical movement of the screen printing assembly into the rotational movement of the pressure plate, a fully automated production line operation for plastic bag screen printing and plastic bag positioning is realized. Compared with manual positioning (which takes 3-5 seconds per cycle), the efficiency is significantly improved, while also reducing energy consumption and saving costs.

[0007] A further feature of this invention is that the screen printing assembly includes a mounting bracket slidably connected to the upright frame, a screen printing plate detachably connected to the mounting bracket, a screen printing frame slidably on the mounting bracket, an ink supply tube mounted on the screen printing frame, and a brush plate mounted at the bottom of the ink supply tube, with a rack plate fixed on the mounting bracket.

[0008] By adopting the above technical solution, an electric slide rail is installed on the mounting frame. The screen printing frame slides on the electric slide rail. After the cylinder is started, it pushes the screen printing plate vertically downward to accurately cover the surface of the plastic bag (the downward pressure can be controlled by adjusting the cylinder stroke). The electric slide rail drives the screen printing frame to move laterally, which drives the brush plate to scrape the ink at a uniform speed, so that the pattern on the screen printing plate is transferred to the surface of the plastic bag through the hollow part.

[0009] A further feature of this invention is that the ink supply tube is connected to the brush plate, the brush plate is in contact with the surface of the screen printing plate, and a control valve is installed on the ink supply tube.

[0010] By adopting the above technical solution, the ink supply tube is responsible for delivering the externally input ink to the brush plate, ensuring a continuous ink supply to the brush plate during the scraping process. The brush plate is in close contact with the surface of the screen printing plate, ensuring that the ink can be accurately transferred to the surface of the plastic bag through the cutout part of the screen printing plate during the scraping process. The control valve can adjust the flow rate of ink in the ink supply tube, flexibly adjusting the ink supply according to the screen printing requirements (such as pattern size, ink concentration, etc.) to avoid waste or insufficient ink. The control valve can also be used as a switch to close the valve when ink supply is not needed, preventing ink leakage or drying and clogging of the ink supply tube.

[0011] A further feature of this invention is that the end of the pressure plate is covered with a silicone layer.

[0012] By adopting the above technical solution, silicone itself has a high coefficient of friction, which can effectively increase the friction between the pressure plate and the plastic bag contact surface, prevent the plastic bag from sliding, and the silicone material is soft and has good resilience, which can absorb impact and protect the surface of the plastic bag from wear or scratches.

[0013] A further feature of this invention is that the connecting frame has an arc-shaped groove, and the pressure plate is slidably connected to the arc-shaped groove through a connecting block.

[0014] By adopting the above technical solution, the arc groove allows the pressure plate to rotate within a certain angle range, thereby improving the stability of the pressure plate rotation.

[0015] A further feature of this invention is that a support plate is also installed on the connecting frame, and a support spring connected to one end of the connecting block is installed on the support plate.

[0016] By adopting the above technical solution, when the pressure plate rotates to the position of pressing the plastic bag, the support spring is in a compressed state. At this time, the elastic potential energy of the spring is converted into an upward supporting force on the pressure plate. When the screen printing component moves upward, the support spring continues to support the pressure plate through its rebound force, preventing it from moving downward due to gravity or inertia, thereby ensuring that the plastic bag is not blocked by the pressure plate during the conveying process and achieves smooth movement.

[0017] The beneficial effects of this utility model are:

[0018] 1. Place the plastic bags to be printed on the conveyor assembly. Then, start the conveyor assembly to send the plastic bags one by one to the bottom of the screen printing assembly. When the cylinder drives the screen printing assembly to move down, the rack and pinion plate meshes with the gear and drives it to rotate. This causes the pressure plate to rotate inward synchronously and press the edge of the plastic bag, effectively offsetting the offset caused by vibration or tension during the printing process, improving the printing effect and stabilizing the yield.

[0019] 2. The conveying component delivers plastic bags one by one to the printing position. Using the same power source (cylinder), the vertical movement of the screen printing component is converted into the rotational movement of the pressure plate, realizing a fully automated production line operation for screen printing and positioning of plastic bags. Compared with manual positioning (which takes 3-5 seconds per cycle), the efficiency is significantly improved, while also reducing energy consumption and saving costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;

[0023] Figure 3 This is a schematic diagram of the connection structure between the connecting frame and the rotating shaft of this utility model.

[0024] In the diagram, 1. Frame; 2. Conveying assembly; 3. Stand; 4. Screen printing assembly; 41. Mounting bracket; 42. Screen printing plate; 43. Screen printing frame; 44. Ink supply tube; 45. Brush plate; 5. Cylinder; 6. Connecting frame; 7. Rotating shaft; 8. Gear; 9. Pressure plate; 10. Rack plate; 11. Support plate; 12. Support spring. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] Example 1, please refer to Figure 1-2 A printing device for processing plastic bags includes a frame 1, a conveying assembly 2 mounted on the frame 1 for horizontally conveying plastic bags, a stand 3 fixed to the back of the frame 1, a screen printing assembly 4 slidably mounted on the stand 3, and a cylinder 5 for driving the screen printing assembly 4 to move up and down. A pair of connecting frames 6 are symmetrically mounted on the frame 1, and each connecting frame 6 is rotatably connected to a rotating shaft 7. A gear 8 located behind the connecting frame 6 and a pressure plate 9 located inside the connecting frame 6 are fixed on the rotating shaft 7. The screen printing assembly 4 has rack plates 10 on both sides that mesh with the corresponding gear 8. The plastic bag to be printed is placed on the conveying assembly 2, and then the conveying assembly 2 is activated to move the plastic bag... One by one, the plastic bags are fed to the bottom of the screen printing component 4. When the cylinder 5 drives the screen printing component 4 to move down, the rack plate 10 meshes with the gear 8 and drives it to rotate, so that the pressure plate 9 rotates inward to press the edge of the plastic bag. This effectively counteracts the deviation caused by vibration or tension during the printing process, improves the printing effect, and stabilizes the yield rate. The conveying component 2 sends the plastic bags to the printing position one by one. Using the same power source (cylinder 5), the vertical movement of the screen printing component 4 is converted into the rotational movement of the pressure plate 9, realizing the fully automatic production line operation of plastic bag screen printing and plastic bag positioning. Compared with manual positioning (which takes 3-5 seconds per cycle), the efficiency is significantly improved, while also reducing energy consumption and saving costs.

[0027] The screen printing assembly 4 includes a mounting frame 41 slidably connected to the stand 3, a screen printing plate 42 detachably connected to the mounting frame 41, a screen printing frame 43 slidably on the mounting frame 41, an ink supply tube 44 mounted on the screen printing frame 43, and a brush plate 45 mounted at the bottom of the ink supply tube 44. A rack plate 10 is fixed on the mounting frame 41, and an electric slide rail is mounted on the mounting frame 41. The screen printing frame 43 slides on the electric slide rail. After the cylinder 5 is started, it pushes the screen printing plate 42 to move vertically downward, accurately covering the surface of the plastic bag (the downward pressure can be controlled by adjusting the cylinder stroke). The electric slide rail drives the screen printing frame 43 to move laterally, driving the brush plate 45 to scrape the ink at a uniform speed, so that the pattern on the screen printing plate 42 is transferred to the surface of the plastic bag through the hollow part.

[0028] The ink supply tube 44 is connected to the brush plate 45, and the brush plate 45 is in contact with the surface of the screen printing plate 42. A control valve is installed on the ink supply tube 44. The ink supply tube 44 is responsible for delivering externally input ink to the brush plate 45 to ensure a continuous ink supply during the brushing process. The brush plate 45 is in contact with the surface of the screen printing plate 42 to ensure that the ink can be accurately transferred to the surface of the plastic bag through the hollow part of the screen printing plate 42 during the brushing process. The control valve can adjust the flow rate of ink in the ink supply tube 44 and flexibly adjust the ink supply according to the screen printing requirements (such as pattern size, ink concentration, etc.) to avoid waste or insufficient ink. The control valve can also be used as a switch to close the valve when ink supply is not needed to prevent ink leakage or drying and clogging of the ink supply tube 44.

[0029] The end of the pressure plate 9 is covered with a silicone layer. The silicone itself has a high coefficient of friction, which can effectively increase the friction between the pressure plate 9 and the plastic bag contact surface, prevent the plastic bag from sliding. The silicone material is soft and has good resilience, which can absorb impact and protect the surface of the plastic bag from wear or scratches.

[0030] Example 2, please refer to Figure 1 and 3 The connecting frame 6 has an arc-shaped groove, and the pressure plate 9 is slidably connected to the arc-shaped groove through the connecting block. The arc-shaped groove allows the pressure plate 9 to rotate within a certain angle range, thereby improving the stability of the rotation of the pressure plate 9.

[0031] The connecting frame 6 is also equipped with a support plate 11, on which a support spring 12 connected to one end of the connecting block is installed. When the pressure plate 9 rotates to the position of pressing the plastic bag, the support spring 12 is in a compressed state. At this time, the elastic potential energy of the spring is converted into an upward supporting force on the pressure plate 9. When the screen printing assembly 4 moves upward, the support spring 12 continues to support the pressure plate 9 through its rebound force, preventing it from moving downward due to gravity or inertia, thereby ensuring that the plastic bag is not blocked by the pressure plate 9 during the conveying process and achieves smooth movement.

Claims

1. A printing device for processing plastic bags, comprising a frame (1), a conveying assembly (2) mounted on the frame (1) for horizontally conveying plastic bags, a stand (3) fixed to the back of the frame (1), a screen printing assembly (4) slidably mounted on the stand (3), and a cylinder (5) for driving the screen printing assembly (4) to move up and down, characterized in that: A pair of connecting frames (6) are symmetrically installed on the frame (1). Each connecting frame (6) is rotatably connected to a rotating shaft (7). A gear (8) located on the rear side of the connecting frame (6) and a pressure plate (9) located on the inner side of the connecting frame (6) are fixed on the rotating shaft (7). The screen printing assembly (4) is provided with rack plates (10) on both sides that mesh with the corresponding side gears (8). When the cylinder (5) drives the screen printing assembly (4) to move down, the rack plate (10) drives the gear (8) to rotate, so that the pressure plate (9) rotates inward synchronously to press the edge of the plastic bag.

2. The inkjet printing device for processing plastic bags according to claim 1, characterized in that: The screen printing assembly (4) includes a mounting bracket (41) slidably connected to the stand (3), a screen printing plate (42) detachably connected to the mounting bracket (41), a screen printing frame (43) slidably on the mounting bracket (41), an ink supply tube (44) mounted on the screen printing frame (43), and a brush plate (45) mounted on the bottom of the ink supply tube (44). The toothed plate (10) is fixed on the mounting bracket (41).

3. The inkjet printing device for processing plastic bags according to claim 2, characterized in that: The ink supply tube (44) is connected to the brush plate (45), the brush plate (45) is attached to the surface of the screen printing plate (42), and a control valve is installed on the ink supply tube (44).

4. The inkjet printing device for processing plastic bags according to claim 3, characterized in that: The end of the pressure plate (9) is covered with a silicone layer.

5. The inkjet printing device for processing plastic bags according to claim 4, characterized in that: The connecting frame (6) has an arc-shaped groove, and the pressure plate (9) is slidably connected to the arc-shaped groove through the connecting block.

6. The inkjet printing device for processing plastic bags according to claim 5, characterized in that: The connecting frame (6) is also equipped with a support plate (11), and a support spring (12) connected to one end of the connecting block is installed on the support plate (11).

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