Pipe double-side printing equipment

Abstract

This utility model relates to the technical field of pipe surface printing equipment, specifically to a double-sided pipe printing device, including a derrick adjustment component, an inkjet printer, an impression traction roller and a gravure printing plate roller, an ink tank, a doctor blade, and a blade holder. The derrick adjustment component calibrates the pipe conveying path, the inkjet printer achieves high-definition printing on one side of the pipe, the impression traction system completes ink transfer on the other side through the impression mechanism, and the ink supply component provides uniform ink to the gravure printing plate roller and scrapes off excess ink. This equipment can complete printing on both sides of the pipe in one conveying, improving production efficiency. Furthermore, the inkjet surface has high resolution, and the impression surface has high wear resistance, making it adaptable to various pipe diameters and materials, meeting diverse marking needs.

Description

Technical Field

[0001] This utility model belongs to the technical field of pipe surface printing equipment, specifically relating to a pipe double-sided printing equipment. Background Technology

[0002] In the pipe manufacturing process, surface printing is an indispensable step, requiring the labeling of product specifications, brand logos, and usage instructions. However, existing printing equipment generally only supports single-sided printing, which has significant limitations: firstly, it cannot meet the need to print brand specifications, anti-counterfeiting codes, or multilingual instructions on both sides of the pipe; secondly, it is difficult to achieve both high-definition (such as fine QR codes) and high wear resistance (to withstand transportation wear) in the printed text. Because traditional single-sided printing equipment technology is limited, it can no longer adapt to diverse application scenarios. In view of the above, this utility model is hereby proposed. Utility Model Content

[0003] In order to solve the above-mentioned technical problems in the prior art, this utility model provides a double-sided printing device for pipes, which can solve the problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A double-sided printing device for pipes includes a pipe conveying track, a frame adjustment assembly, an inkjet printer, an impression traction roller, a gravure printing plate roller, a doctor blade, an ink tank, and a blade holder. The derrick adjustment assembly is located on the pipe conveying track; the inkjet printer is located on one side of the pipe conveying track; the embossing traction roller and the gravure printing plate roller are located on both sides of the pipe conveying track, and the embossing traction roller and the gravure printing plate roller are arranged opposite to each other; the ink tank is located below the gravure printing plate roller; the knife holder is mounted on the machine frame support; and the doctor blade is assembled on the knife holder.

[0005] Furthermore, the derrick adjustment assembly includes two sets of symmetrically arranged adjustment frames. The adjustment frames are provided with slide grooves extending perpendicular to the pipe conveying direction. They are fixed to the inlet end of the frame by bolts and located upstream of the inkjet printer and the imprinting traction roller. The adjustment frames slide along the slide grooves.

[0006] Furthermore, the inkjet printer includes a printhead body and a fixed bracket. The printhead body is provided with an inkjet nozzle facing the pipe conveying path. The fixed bracket is connected to the frame by bolts. The inkjet printer is suspended on one side of the pipe conveying path. The inkjet nozzle of the printhead body maintains a preset distance from the pipe surface and the inkjet direction is perpendicular to the pipe surface.

[0007] Furthermore, the inkjet printer has an inkjet resolution of no less than 1200 dpi and an ink droplet size of 5-15 μm.

[0008] Furthermore, both ends of the impression traction cylinder and the gravure printing plate cylinder are provided with shaft heads. The shaft heads are mounted on the frame through bearing seats. Deep groove ball bearings or tapered roller bearings are installed in the bearing seats. The bearing seats are fastened to the frame with bolts, and the axes of the two are parallel.

[0009] Furthermore, the embossing traction roller adopts a composite layer structure, with alloy steel as the metal core and polyurethane rubber layer covering the outside of the metal core; The gravure printing plate cylinder is made of alloy steel as the base material, and its outer surface is chrome-plated.

[0010] Furthermore, the distance between the impression traction roller and the gravure printing plate roller can be adjusted according to the diameter of the tube.

[0011] Furthermore, the imprinting pressure range of the imprinting traction cylinder and the gravure printing plate cylinder is 0.3-0.8 MPa.

[0012] Furthermore, the doctor blade is a long strip-shaped blade with a fixing hole at one end and a cutting edge at the other end. It is bolted to the frame support through the fixing hole, and the cutting edge contacts the outer surface of the gravure printing plate cylinder. Furthermore, the ink tank is a rectangular tank with an open top, and mounting ears on both sides are provided and connected to the frame by bolts through the mounting ears. The lower outer surface of the gravure printing plate cylinder is immersed in the ink in the ink tank.

[0013] This utility model provides a double-sided printing device for pipes, including a derrick adjustment assembly, an inkjet printer, an impression traction roller and a gravure printing plate roller, an ink tank, and a doctor blade. The derrick adjustment assembly calibrates the pipe conveying path, the inkjet printer achieves high-definition printing on one side of the pipe, the impression traction system completes ink transfer on the other side through the impression mechanism, and the ink supply assembly provides uniform ink to the gravure printing plate roller and removes excess ink. This device can complete printing on both sides of the pipe in one conveying operation, improving production efficiency. Furthermore, the inkjet surface has high resolution, and the impression surface has high wear resistance, making it adaptable to various pipe diameters and materials to meet diverse marking needs. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of the double-sided printing device for pipes provided in this embodiment of the utility model.

[0015] Explanation of reference numerals in the attached figures: 1. Derrick adjustment assembly; 2. Inkjet printer; 3. Imprinting traction roller; 4. Gravure printing plate roller; 5. Doctor blade; 6. Ink tank. Detailed Implementation

[0016] The technical solution of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of this utility model.

[0018] The following description of exemplary embodiments is merely illustrative and is not intended to limit the present invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0019] Example 1 See Figure 1 The double-sided printing device provided in this embodiment specifically includes a pipe conveying track, a hoist adjustment assembly 1, an inkjet printer 2, an impression traction roller 3, a gravure printing plate roller 4, a doctor blade 5, an ink tank 6, and a blade holder. The derrick adjustment assembly 1 consists of two symmetrically arranged adjustment frames to realize the derrick adjustment function. The adjustment frame is provided with a slide groove extending perpendicular to the pipe conveying direction. It is fixed to the inlet end of the frame by bolts and is located upstream of the inkjet printer 2 and the imprinting traction roller 3. The pipe is restricted to the roller according to the pipe width, and the adjustment frame can slide along the slide groove to adapt to pipes of different diameters. The inkjet printer 2 includes a printhead body and a fixed bracket. The printhead body is provided with an ink nozzle facing the pipe conveying path. Its fixed bracket is connected to the frame by bolts, so that the inkjet printer 2 is suspended on one side of the pipe conveying path. The ink nozzle of the printhead body maintains a preset distance from the pipe surface. The impression traction roller 3 is a cylindrical roller with shafts at both ends. The shafts are mounted on the frame via bearing seats and are located on one side of the pipe conveying path. It is located on opposite sides of the pipe and the inkjet printer 2. The roller can rotate around its own axis, and its rotation direction is adapted to the pipe conveying direction. The gravure printing plate roller 4 is a cylindrical roller with concave graphics on its surface and shafts at both ends. The shafts are mounted on the frame via bearing seats and are positioned opposite to the impression traction roller 3 (the axes of the two are parallel), forming an impression gap for the pipe to pass through. The gravure printing plate roller 4 can rotate around its own axis, and its rotation direction is opposite to that of the impression traction roller 3. The impression traction cylinder 3 adopts a composite layer structure design. Its core material is alloy steel, forming the metal core of the cylinder. A rubber layer is wrapped around the outside of the metal core, specifically polyurethane rubber (PU). Through the combination of the metal core and the polyurethane rubber layer, the overall structural strength of the cylinder is ensured, and the properties of the rubber layer can achieve stable traction and impression buffering for the tubing. The gravure printing plate cylinder 4 uses alloy steel as its base material. To improve the wear resistance, corrosion resistance, and stability of the printing plate pattern, the outer surface of the alloy steel cylinder is chrome-plated to form a uniform chrome plating layer. This ensures that the cylinder maintains surface accuracy during long-term ink transfer and impression operations, meeting the requirements for continuous and stable printing.

[0020] The doctor blade holder adopts an aluminum alloy or steel grooved structure and is mounted on the bracket via a slider or guide rail. This mounting method ensures that the doctor blade holder can slide smoothly along the cylinder axis, thereby realizing the full-width doctor blade adjustment function. The journal of the gravure printing plate cylinder 4 is mounted in a bearing housing via bearings (deep groove ball bearings, tapered roller bearings, etc.), and the bearing housing is fastened to the frame with bolts; and the sliding clearance of the doctor blade holder is no more than 0.05mm. The doctor blade 5 is made of high-speed steel, alloy tool steel, or alumina ceramic, with a thickness of 0.1mm-0.3mm.

[0021] During assembly, insert the doctor blade 5 into the clamping slot of the blade holder, and then tighten it using bolts or an eccentric shaft. During tightening, ensure uniform clamping force to prevent deformation of the doctor blade 5. Before installation, inspect the blade edge to ensure it is burr-free; if burrs are present, lightly grind them with fine sandpaper. The bracket is equipped with an angle adjustment mechanism, which includes a rotating shaft and a locking bolt. By operating the angle adjustment mechanism, the contact angle between the blade edge and the roller surface can be adjusted to between 60° and 75°. A protractor can be used for auxiliary measurement during adjustment. After adjustment, tighten the angle fixing bolt to maintain the current angle stability.

[0022] A pressure assembly is installed at the rear of the blade holder, and this assembly is secured by a spring pressure device. During assembly, it is crucial to ensure that the pressure provided by the spring pressure device is perpendicular to the blade contact point to prevent lateral forces from causing the doctor blade 5 to shift. To enhance equipment safety and environmental friendliness, a transparent acrylic glass cover is installed on the outside of the blade holder. This cover effectively prevents ink splattering and avoids direct contact between the operator and the blade. An inclined metal trough is installed below the blade to collect excess ink generated during the doctoring process. The collected ink flows back to the ink tank through a pipe, reducing ink waste and minimizing environmental pollution risks.

[0023] The doctor blade 5 is a long strip-shaped blade with a fixing hole at one end and a cutting edge at the other end. It is bolted to the bracket on the frame through the fixing hole. The bracket is located above the gravure printing cylinder 4, and the cutting edge is in contact with the outer surface of the gravure printing cylinder 4. The contact point is located on the side of the gravure printing cylinder 4 away from the ink tank 6. The ink tank 6 is a rectangular tank with an open top. It has mounting ears on both sides and is bolted to the frame through the mounting ears. It is located below the gravure printing cylinder 4, and the lower outer surface of the gravure printing cylinder 4 is immersed in the ink in the ink tank 6.

[0024] The pipe is conveyed horizontally, passing sequentially through the derrick adjustment assembly 1, the inkjet area of ​​the inkjet printer 2, and the impression gap between the impression traction roller 3 and the gravure printing plate roller 4. The assembly and key structural parameters of each component are as follows: The adjusting frame of the derrick adjusting assembly 1 adjusts the spacing through the slide groove, clamping the pipe from both sides to limit the conveying trajectory; the inkjet nozzle of the inkjet printer 2 corresponds to one side of the pipe surface to achieve single-sided printing, the vertical distance between its printhead and the pipe surface is fixed, and the ink jetting direction is perpendicular to the pipe surface; the impression traction roller 3 and the gravure printing plate roller 4 pull the pipe through the impression gap by rotating in opposite directions, and the ink on the gravure printing plate roller 4 is transferred to the other side of the pipe surface to achieve printing on the other side, while the axes of the two remain parallel, forming an impression gap for the pipe to pass through, which can be finely adjusted by the adjusting bolts on the frame; the ink tank 6 provides ink to the gravure printing plate roller 4, and the doctor blade 5 contacts the surface of the gravure printing plate roller 4 to scrape off excess ink, and the contact angle between the doctor blade 5 and the gravure printing plate roller 4 is fixed, and the blade is in close contact with the roller surface without gap.

[0025] In summary, this utility model has the following advantages: 1. By combining inkjet printer and roller printing, printing can be completed on both sides of the pipe in one conveying, thus improving production efficiency; 2. By adopting high-precision inkjet technology, its inkjet resolution is no less than 1200dpi, and the ink droplet size is controlled within 5-15μm, which can realize micron-level resolution of graphic printing, thereby meeting the needs of fine graphic printing. 3. The ink penetrates to a depth of 0.1mm, improving wear resistance; 4. It supports pipe diameters of 10-110mm and is compatible with various materials such as PVC, PE, and metal, meeting the diverse marking needs of industries such as food, medical, and construction.

[0026] The above specific embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A double-sided printing device for pipes, characterized in that, Includes pipe conveying track, derrick adjustment assembly, inkjet printer, embossing traction roller, gravure printing plate roller, doctor blade, ink tank and blade holder; The derrick adjustment assembly is located on the pipe conveying track; the inkjet printer is located on one side of the pipe conveying track; the embossing traction roller and the gravure printing plate roller are located on both sides of the pipe conveying track, and the embossing traction roller and the gravure printing plate roller are arranged opposite to each other; the ink tank is located below the gravure printing plate roller; the knife holder is mounted on the machine frame support; and the doctor blade is assembled on the knife holder.

2. The pipe double-sided printing equipment according to claim 1, characterized in that, The derrick adjustment assembly includes two sets of symmetrically arranged adjustment frames. The adjustment frames are provided with slide grooves extending perpendicular to the pipe conveying direction. They are fixed to the inlet end of the frame by bolts and located upstream of the inkjet printer and the printing traction roller. The adjustment frames slide along the slide grooves.

3. The pipe double-sided printing equipment according to claim 1, characterized in that, The inkjet printer includes a printhead body and a fixed bracket. The printhead body has an inkjet nozzle facing the pipe conveying path. The fixed bracket is connected to the frame by bolts. The inkjet printer is suspended on one side of the pipe conveying path. The inkjet nozzle of the printhead body maintains a preset distance from the pipe surface and the inkjet direction is perpendicular to the pipe surface.

4. The pipe double-sided printing equipment according to claim 1, characterized in that, The inkjet printer has an inkjet resolution of no less than 1200 dpi and an ink droplet size of 5-15 μm.

5. The pipe double-sided printing equipment according to claim 1, characterized in that, Both ends of the printing traction cylinder and the gravure printing plate cylinder are provided with shaft heads. The shaft heads are installed on the frame through bearing seats. Deep groove ball bearings or tapered roller bearings are installed in the bearing seats. The bearing seats are fastened to the frame with bolts, and the axes of the two are parallel.

6. The pipe double-sided printing equipment according to claim 1, characterized in that, The embossing traction roller adopts a composite layer structure, with alloy steel as the metal core and polyurethane rubber layer covering the outside of the metal core. The gravure printing plate cylinder is made of alloy steel as the base material, and its outer surface is chrome-plated.

7. The pipe double-sided printing equipment according to claim 6, characterized in that, The distance between the embossing traction roller and the gravure printing plate roller can be adjusted according to the diameter of the pipe.

8. The pipe double-sided printing equipment according to claim 6, characterized in that, The imprinting pressure range of the imprinting traction cylinder and the gravure printing plate cylinder is 0.3-0.8 MPa.

9. The pipe double-sided printing equipment according to claim 1, characterized in that, The doctor blade is a long strip-shaped blade with a fixing hole at one end and a cutting edge at the other end. It is bolted to the frame support through the fixing hole, and the cutting edge contacts the outer surface of the gravure printing plate cylinder.

10. The pipe double-sided printing equipment according to claim 1, characterized in that, The ink tank is a rectangular tank with an open top, and mounting ears on both sides are provided and connected to the frame by bolts. The lower outer surface of the gravure printing plate cylinder is immersed in the ink in the ink tank.

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