A structure of a coating head of a printing, laminating and coating apparatus

Abstract

The utility model discloses a kind of coating head structures of printing laminating gluing device, it is related to printing laminating equipment technical field.It includes π type shell, shell two vertical parts are installed coating structure respectively, and coating structure contains coating rod, elastic buffer component, glue connector and connecting seat;Connecting seat is connected with shell vertical part screw thread, and the spring of elastic buffer component abuts against connecting seat and external connecting piece, a pair of parallel pagoda-shaped glue connector is communicated coating rod glue channel and glue outlet device, and shell horizontal part hollow structure spreads even glue out.This structure is even glue by π type shell, double-hole glue inlet stable quantity, spring buffering pressure and leak-proof design, solve the existing device coating uneven, glue quantity is not stable, pressure fluctuation affects quality and glue leakage problem, improve coating precision and stability, applicable to printing laminating process.

Description

Technical Field

[0001] This utility model relates to the field of printing and laminating equipment technology, specifically to a coating head structure of a printing and laminating adhesive coating device. Background Technology

[0002] The coating head structure of the printing laminating adhesive applicator is the core component in the printing laminating process. Its main function is to accurately and evenly apply adhesive to the surface of the substrate to be laminated. By controlling the amount of adhesive and the coating accuracy, it ensures that the substrate and the laminating film can be tightly bonded in subsequent processing, ultimately guaranteeing the flatness, bonding strength and appearance quality of the printed laminated product. It is widely used in packaging printing, bookbinding and other fields.

[0003] Existing printing and laminating coating equipment typically consists of a simple outer shell, a single or asymmetrically distributed coating rod, and a glue inlet assembly. The outer shell is often a single-cavity or open structure, lacking a dedicated glue-leveling design. Glue inlets often employ single-hole or non-parallel dual-hole inlets, making it difficult to ensure a stable glue supply during dual-hole filling. The buffer structure is usually a rigid connection or a simple elastic component, which cannot effectively buffer pressure fluctuations during coating. Sudden pressure changes can easily cause deformation of the coating rod or inconsistent glue supply, affecting coating uniformity. Furthermore, the existing structures have simple sealing designs at the connection between the glue inlet and the coating rod, and at the joint between the coating rod and the outer shell, often resulting in glue leakage. This not only wastes glue but also contaminates the substrate and equipment, making it difficult to meet the requirements for high-precision and stable coating. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model aims to provide a coating head structure for a printing and coating adhesive application device, thereby solving problems such as uneven coating, unstable adhesive filling in dual holes, pressure fluctuations affecting coating quality, and poor sealing leading to adhesive leakage.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A coating head structure of a printing and laminating adhesive coating device includes a π-shaped outer shell, with coating structures installed in two vertical sections of the π-shaped outer shell. Each coating structure includes a coating rod, an elastic buffer assembly, an adhesive inlet connector, and a connecting seat. The connecting seat is cylindrical, with an external thread on the outer peripheral wall of one end, and is threaded to the inner wall of the vertical section of the π-shaped outer shell via the external thread. The elastic buffer assembly includes a spring sleeved on the outer periphery of the coating rod, with one end of the spring abutting against the connecting seat and the other end abutting against an external connector that is sealed to the coating rod. The adhesive inlet connectors are pagoda-shaped and are a pair distributed in parallel. One end of each adhesive inlet connector is connected to the adhesive inlet channel of the coating rod, and the other end is connected to an adhesive outlet device. One adhesive inlet connector penetrates the vertical section of the outer shell, and the other adhesive inlet connector penetrates the external connector. The adhesive inlet connectors divide the coating structure into a fixed end located inside the vertical section and a movable end located outside the outer shell, with the spring buffering the internal pressure of the coating structure.

[0007] The horizontal portion of the π-shaped outer shell is a hollow structure with an internal cavity, and the two vertical portions of the π-shaped outer shell are connected to the cavity of the horizontal portion; the hollow structure is used to spread the adhesive out of the coating structure.

[0008] The coating rod is a hollow rod with an internal glue inlet channel. The coating rod has a glue outlet near the hollow structure at one end for coating, and the glue outlet is connected to the glue inlet channel.

[0009] A seal is provided at the connection between the glue inlet connector and the glue inlet channel of the coating rod.

[0010] The connecting seat has a recessed mounting cavity at the end away from the spring, and the coating rod passes through the mounting cavity and slides in cooperation with the mounting cavity.

[0011] A sealing ring is provided between the inner wall of the mounting cavity and the outer peripheral wall of the coating rod.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages compared with the prior art:

[0013] This invention features a π-shaped outer shell with a hollow horizontal section that evenly distributes the adhesive during coating, effectively improving the uneven coating problem of existing devices and enhancing coating accuracy. A pair of parallel adhesive inlet connectors achieve dual-hole filling, ensuring stable adhesive supply and avoiding adhesive fluctuations caused by single-hole or non-parallel dual-hole inlet feeding. The spring in the elastic buffer assembly abuts against the connecting seat and external connectors, effectively buffering internal pressure fluctuations during coating, reducing the impact of sudden pressure changes on the coating rod and coating quality, and extending the device's service life. The threaded connection between the connecting seat and the vertical part of the outer shell, the sliding fit between the coating rod and the connecting seat mounting cavity, along with the sealing components and sealing rings, ensure the overall structure's airtightness, effectively preventing adhesive leakage and reducing adhesive waste and equipment contamination.

[0014] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0015] Figure 1 This is an assembly diagram of the coating head structure of a printing and coating adhesive device according to the present invention;

[0016] Figure 2 This is a schematic diagram of the coating head structure of a printing coating and adhesive coating device according to the present invention;

[0017] Figure 3 This is an exploded view of the fixed end and movable end of the coating head structure of a printing coating and adhesive applicator according to the present invention.

[0018] Figure 4 This is a cross-sectional view of the coating structure of the coating head structure of a printing coating and adhesive coating device according to this utility model.

[0019] As shown in the figure:

[0020] 1. Outer shell; 11. Vertical part; 2. Coating structure; 21. Coating rod; 22. Elastic buffer assembly; 23. Glue inlet connector; 24. Connecting seat; 3. Spring; 25. External connector; 26. Fixed end; 27. Movable end; 12. Hollow structure; 28. Hollow rod body; 29. ​​Glue outlet. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] like Figure 1-4 As shown, a coating head structure of a printing and coating adhesive device includes a π-shaped outer shell 1, with two vertical parts 11 symmetrically distributed and a horizontal part being a hollow structure 12 with an internal cavity. Both vertical parts 11 are connected to the cavity of the horizontal part, and the adhesive is spread evenly through the hollow structure 12.

[0025] Each vertical section 11 is equipped with a coating structure 2, which includes a coating rod 21, an elastic buffer assembly 22, an adhesive inlet connector 23, and a connecting seat 24. The connecting seat 24 is cylindrical, with an external thread on the outer peripheral wall of one end. It is threaded to the inner wall of the vertical section 11 through the external thread, thereby achieving the fixed installation of the coating structure 2 in the outer casing 1.

[0026] The coating rod 21 is a hollow rod 28 with an internal glue inlet channel. One end, used for coating, has a glue outlet 29. The outlet 29 is close to the hollow structure 12 and communicates with the glue inlet channel, ensuring that the glue can smoothly enter the hollow structure 12 and be evenly spread. The connecting seat 24 has a recessed mounting cavity at the end furthest from the spring 3. The coating rod 21 passes through the mounting cavity and slides within it. A sealing ring is provided between the inner wall of the mounting cavity and the outer peripheral wall of the coating rod 21 to enhance the sealing of the sliding fit.

[0027] The elastic buffer assembly 22 includes a spring 3 sleeved on the outer periphery of the coating rod 21. One end of the spring 3 abuts against the connecting seat 24, and the other end abuts against the external connector 25. The external connector 25 is sealed to the coating rod 21. The elastic deformation of the spring 3 buffers the pressure fluctuation inside the coating structure 2.

[0028] The glue inlet connector 23 is pagoda-shaped, with a pair of parallel connectors. One end is connected to the glue inlet channel of the coating rod 21, and a seal is provided at the connection to prevent glue leakage. The other end is connected to the glue dispensing device. One glue inlet connector 23 passes through the vertical part 11 of the outer shell 1, and the other passes through the external connector 25. The glue inlet connector 23 divides the coating structure 2 into a fixed end 26 located inside the vertical part 11 and a movable end 27 located outside the outer shell 1, ensuring stable glue inlet while adapting to structural movement during pressure buffering.

[0029] The working process of this utility model is as follows: the glue dispensing device supplies glue to the glue inlet channel of the coating rod 21 through a pair of parallel glue inlet joints 23. The glue enters the hollow structure 12 of the horizontal part of the outer shell 1 through the glue outlet 29. After being spread evenly in the hollow structure 12, the coating is completed. During the coating process, if pressure fluctuation occurs, the spring 3 buffers the pressure through extension and contraction deformation to avoid sudden force changes on the coating rod 21. At the same time, each sealing structure ensures that the glue does not leak and ensures stable coating quality.

[0030] During actual installation, the π-shaped outer shell 1 needs to be fixed to the corresponding position on the frame of the printing and coating equipment through the outer wall of the horizontal part or the preset mounting holes, ensuring that the opening of the hollow structure 12 of the horizontal part of the outer shell 1 faces the substrate to be coated, and that the two vertical parts 11 are symmetrically distributed on both sides of the horizontal part. For the installation of the coating structure 2, first screw the connecting seat 24 into the corresponding threaded hole on the inner wall of the vertical part 11 through the external thread on the outer peripheral wall, and tighten it until the connecting seat 24 is flush with the inner wall of the vertical part 11; then insert the coating rod 21 into the mounting cavity of the connecting seat 24, so that the glue outlet 29 of the coating rod 21 faces the hollow structure 12 of the horizontal part; then put the spring 3 on the outer periphery of the coating rod 21, with one end of the spring 3 abutting against the end face of the connecting seat 24 and the other end abutting against the external connecting piece 25; finally, seal the external connecting piece 25 to the coating rod 21 (e.g., threaded connection with sealant), completing the assembly and fixing of the coating structure 2. The glue inlet connector 23 needs to be connected to the external glue dispensing device: the glue inlet connector 23 that passes through the vertical part 11 is connected to the fixed glue tube (the other end of the glue tube is connected to the glue pump or glue storage tank) through the pagoda-shaped interface; the glue inlet connector 23 that passes through the external connector 25 is also connected to the movable glue tube (to adapt to subsequent buffering action) through the pagoda-shaped interface; and the connection between the glue inlet connector 23 and the coating rod 21 and the external connector 25 must ensure that the sealing element (such as O-ring) is installed in place.

[0031] In actual use, the operating status of each component is as follows:

[0032] Colloid flow path: An external dispensing device (such as a glue pump) supplies glue to the glue inlet channel of the coating rod 21 simultaneously through two parallel glue inlet joints 23. The glue flows through the internal channel of the hollow rod body 28 to the glue outlet 29. After being discharged from the glue outlet 29, it enters the hollow structure 12 of the horizontal part of the π-shaped outer shell 1. It spreads naturally in the cavity space of the hollow structure 12 and is finally evenly coated onto the surface of the substrate to be coated from the opening of the horizontal part.

[0033] Elastic buffering process: When pressure fluctuations occur during coating (such as sudden changes in glue pump pressure or uneven substrate surface causing force changes on coating rod 21), spring 3 buffers the pressure through expansion and contraction: if the pressure increases, coating rod 21 is pushed outward, causing external connector 25 to compress spring 3, and the elastic force of spring 3 offsets part of the pressure; if the pressure decreases, spring 3 returns to its original position and extends, pushing external connector 25 and coating rod 21 inward to ensure stable contact pressure between coating rod 21 and substrate. During this process, coating rod 21 slides within the mounting cavity of connector 24. The sealing ring between the inner wall of the mounting cavity and the outer peripheral wall of coating rod 21 prevents glue leakage from the sliding gap. External connector 25 moves synchronously with coating rod 21, and its connected movable glue tube can bend accordingly to avoid glue interruption due to displacement.

[0034] Structural synergy: The connecting seat 24 ensures the stability of the fixed end 26 of the coating structure 2 within the vertical part 11 through the threaded connection; the parallel distribution of the glue inlet connector 23 ensures the balanced glue inlet volume of the two holes and avoids flow fluctuations of the glue inlet from the single hole; the π-shaped structure of the outer shell 1 collects and spreads the glue from both sides of the coating structure 2 through the hollow structure 12 in the horizontal part, solving the problem of uneven glue inlet on one side; the seal at the connection between the glue inlet connector 23 and the coating rod 21 prevents the glue from leaking from the joint gap, ensuring the glue utilization efficiency.

[0035] In practical applications, this device needs to be used in conjunction with a gear pump, a technology already in use, as the glue dispensing device. The gear pump achieves a stable glue output by precisely controlling its rotation speed, and its outlet is connected to the glue inlet connector via a glue hose. The substrate to be coated is conveyed by an existing conveyor roller assembly. The rotation speed of the conveyor roller assembly and the glue supply of the gear pump need to be adjusted in conjunction with the PLC control system to ensure the consistency of the coating thickness.

[0036] The outer casing is CNC machined from 6061 aluminum alloy, a material that combines lightweight design with structural strength. Anodizing enhances its corrosion resistance. The coating rod is made of 304 stainless steel, with a polished inner wall to reduce adhesive flow resistance and a chrome-plated outer wall at the mating point with the mounting cavity to enhance wear resistance. The spring is made of 65Mn spring steel and undergoes quenching and tempering to ensure long-term elastic stability. The seals are made of nitrile rubber, a material with excellent oil resistance and good compression resilience, effectively preventing adhesive leakage. The adhesive inlet hose is made of polyurethane, which is flexible, resistant to adhesive corrosion, and can adapt to the bending requirements of external connectors during movement.

[0037] In addition, the existing high-pressure air gun and scraper need to be provided next to the equipment. The high-pressure air gun is used to clean the glue outlet of the coating rod and the residual glue in the hollow structure of the outer shell after the machine is stopped. The scraper is used to remove any glue nodules that may appear on the surface of the substrate to ensure a smooth coating surface. The tension of the substrate is regulated by a tension control system consisting of an existing tension sensor and a magnetic powder brake to prevent wrinkles caused by tension fluctuations in the substrate, which would affect the coating effect.

[0038] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A coating head structure for a printing, laminating, and adhesive coating apparatus, characterized in that, It includes a π-shaped outer shell (1), and coating structures (2) are respectively installed in the two vertical parts (11) of the π-shaped outer shell (1); Each coating structure (2) includes a coating rod (21), an elastic buffer assembly (22), an adhesive inlet connector (23), and a connecting seat (24); the connecting seat (24) is cylindrical, and one end of the connecting seat (24) has an external thread on its outer peripheral wall. The connecting seat (24) is threaded to the inner wall of the vertical part (11) of the π-shaped outer shell (1) through the external thread; The elastic buffer assembly (22) includes a spring (3) sleeved on the outer periphery of the coating rod (21), one end of the spring (3) abutting against the connecting seat (24), and the other end abutting against an external connector (25) that is sealed to the coating rod (21); The glue inlet connector (23) is pagoda-shaped and is a pair of parallel connectors. One end of the glue inlet connector (23) is connected to the glue inlet channel of the coating rod (21), and the other end is connected to the glue outlet device. One of the glue inlet connectors (23) penetrates the vertical part (11) of the outer shell (1), and the other glue inlet connector (23) penetrates the external connector (25). The glue inlet connector (23) divides the coating structure (2) into a fixed end (26) placed inside the vertical part (11) and a movable end (27) placed outside the outer shell (1), and uses a spring (3) to buffer the internal pressure of the coating structure (2).

2. The coating head structure of the printing, coating, and adhesive coating apparatus according to claim 1, characterized in that, The horizontal part of the π-shaped shell (1) is a hollow structure (12) with an internal cavity, and the two vertical parts (11) of the π-shaped shell (1) are connected to the cavity of the horizontal part; The hollow structure (12) spreads the adhesive onto the coating structure (2).

3. The coating head structure of the printing, coating, and adhesive coating apparatus according to claim 1, characterized in that, The coating rod (21) is a hollow rod (28) with an internal glue inlet channel. The coating rod (21) has a glue outlet (29) near the hollow structure (12) at one end for coating. The glue outlet (29) is connected to the glue inlet channel.

4. The coating head structure of the printing, coating, and adhesive coating apparatus according to claim 1, characterized in that, A seal is provided at the connection between the glue inlet connector (23) and the glue inlet channel of the coating rod (21).

5. The coating head structure of the printing, coating, and adhesive coating apparatus according to claim 1, characterized in that, The connecting seat (24) has a recessed mounting cavity at the end away from the spring (3), and the coating rod (21) passes through the mounting cavity and slides in the mounting cavity.

6. The coating head structure of the printing, coating, and adhesive coating apparatus according to claim 5, characterized in that, A sealing ring is provided between the inner wall of the mounting cavity and the outer peripheral wall of the coating rod (21).

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