A printed matter blowing and flattening unit and a detection device

Abstract

The utility model discloses a kind of printed matter blowing flattening unit and detection device, printed matter blowing flattening unit includes gas storage tank and air knife, the import end of the gas storage tank is communicated with gas source, to store gas, the air knife inner chamber import is communicated with the export end of gas storage tank, the nozzle of the air knife is oriented roller for blowing flattening printed matter on it, the nozzle of the air knife extends linearly along roller axis. Detection device includes shooting unit, lighting unit and printed matter blowing flattening unit. The utility model is reasonable in structure, low in energy consumption and low in cost, good in blowing flattening effect and can reduce the technical effect of the degree of equipment heating.

Description

Technical Field

[0001] This utility model relates to the field of printing production equipment technology, specifically to a printing air blowing and flattening unit and a detection device. Background Technology

[0002] Offset printing is a common planographic printing method widely used for high-quality printing of books, magazines, and brochures. Its basic principle is based on the immiscibility of oil and water. Unlike other printing methods, offset printing uses sheet-fed paper on the rollers. In the current printing process, paper is transported by grippers on the rollers that hold the head of the printed paper and rotate it before handing it over to the grippers on the next roller. During the rotation of the paper head by the grippers, the paper may detach from the rollers due to centrifugal force and airflow, resulting in a floating state.

[0003] In online inspection of printed images, if the paper floats or is unstable, it will severely affect the inspection results, requiring the paper to be firmly adhered to the roller. Furthermore, in production practice, because the ink on the paper is not completely dry during online inspection, camera imaging is often used to detect printing defects.

[0004] In existing technologies, to ensure good paper adhesion to the roller, a blowing structure is usually used, with a fan or air compressor as the air source to directly supply air to the air knife, and the air pressure is used to adhere the paper to the roller. Generally speaking, using a larger air flow and air pressure can ensure good paper adhesion, but it consumes more energy and is more expensive; conversely, the adhesion is not good. The air flow and air pressure matched with the paper weight can not only ensure good paper adhesion but also help reduce energy consumption. In addition, the better the uniformity and stability of the blowing, the better the paper adhesion.

[0005] However, in production practice, the grammage of paper varies in different batches, but the rated power of the fan or air compressor remains constant. In order to adapt to different grammage paper, the energy consumption of the fan or air compressor is often sacrificed, resulting in high production costs. Moreover, frequent start-ups and shutdowns or continuous high-power operation not only easily damage the fan or air compressor itself, but also cause heat generation, affecting printing quality and hindering continuous production. Utility Model Content

[0006] This utility model discloses a printed matter air-blowing and flattening unit and detection device, which solves the technical problems of high energy consumption, high cost, and high heat generation in existing air-blowing and flattening units, which are detrimental to continuous production. It features a reasonable structure, low energy consumption and low cost, good air-blowing and flattening effect, and reduces the heat generated by the equipment. The technical solution adopted is as follows: A printed matter air-blowing flattening unit includes: A gas storage tank, the inlet of which is connected to a gas source to store gas; An air knife, the inlet of which is connected to the outlet of an air tank, the nozzle of which faces the roller to blow air onto the printed matter and flatten it, so that the printed matter adheres to the roller, and the nozzle of which extends linearly along the roller axis.

[0007] Based on the above technical solution, the linearly extended nozzle includes a plurality of sub-nozzles spaced apart. The sub-nozzles are designed such that the gas in the air knife diffuses outward in a fan shape through the sub-nozzles and spans the width of the roller.

[0008] Based on the above technical solution, the nozzle of the air knife is designed such that the air flow rate and air pressure of the nozzle are positively correlated with the weight of the printed matter.

[0009] Based on the above technical solution, the nozzle of the air knife is designed such that when the roller carrying the printed head rotates past the nozzle, the nozzle of the air knife blows air to flatten the printed material.

[0010] Based on the above technical solution, a flow regulating valve and a first valve body are sequentially installed along the airflow direction on the pipeline connecting the gas storage tank and the air knife. The flow regulating valve is used to regulate the airflow and air pressure of the air knife, and the first valve body is used to regulate the opening and closing of the pipeline. Preferably, the flow regulating valve is a ball valve core proportional valve.

[0011] Based on the above technical solution, the air source is an air compressor, and the motor of the air compressor is electrically connected to the controller through a frequency converter.

[0012] A printed matter inspection device includes an imaging unit, an illumination unit, and the aforementioned printed matter air blowing and flattening unit; The imaging unit is used to capture an image of the inspected surface of the printed matter on the roller within a set area. The lighting unit is used to illuminate the inspection surface image within a set area; The air-blowing flattening unit is used to blow air to flatten the inspected surface of the printed matter and to make it adhere to the roller. The air-blowing flattening unit is designed to blow air to flatten the inspected surface before the inspected surface of the printed matter is rotated to a set area.

[0013] Based on the above technical solution, the air knife is parallel to the axis of the roller and the angle of the air knife is adjustable to facilitate the adjustment of the relative angle and distance between the nozzle and the roller; the lighting unit is parallel to the axis of the roller and the angle of the lighting unit is adjustable to adjust the lighting area on the roller; the shooting unit is angle adjustable to adjust the position of the set area for shooting on the roller.

[0014] Based on the above technical solution, the lighting unit and the air blowing flattening unit are covered with a protective cover, and the protective cover is provided with a light-transmitting plate for the shooting unit to take pictures and form images.

[0015] Based on the above technical solution, the light-transmitting plate includes a transparent window and a transparent cover plate. The transparent window is embedded in a notch on the protective cover. One end of the transparent cover plate is hinged to the protective cover. The transparent cover plate can cover the transparent window. The other end of the transparent cover plate is connected to the protective cover.

[0016] Beneficial effects The air-blowing flattening unit in this invention has a reasonable structure. The air source is connected to the air knife via an air tank, which allows for flexible use. On the one hand, it ensures a stable and uniform air supply to the air knife and buffers the gas released by the blower or air compressor, which is beneficial to improving the flattening effect of printed materials. On the other hand, it provides conditions for the blower or air compressor to operate at low power, which not only reduces the working power of the air source components and reduces heat generation, but also allows the air source components to operate continuously when the air knife nozzle is shut off, avoiding frequent start-stop cycles and further reducing heat generation. In addition, it avoids damage to the air source components from high-power operation. Furthermore, in the event of a failure of the blower or air compressor, the air tank allows for air source replacement without shutting down the system, ensuring production continuity. In this invention, an air compressor is used as the air source, which not only provides a stable air supply but also facilitates control of the blowing pressure.

[0017] In addition, a flow regulating valve is provided, which can match the appropriate blowing flow and air pressure according to the different weights of the printed materials. It has good flexibility of use, which helps to significantly reduce energy consumption and waste, and reduce production costs. The flow regulating valve can be a ball valve core proportional valve, which can accurately control the gas flow and ensure stable air pressure, ensuring good coating of the printed materials on the roller.

[0018] The nozzle of this invention's air knife extends linearly and includes multiple axially extending sub-nozzles. This ensures that the released gas has sufficient pressure and good directionality, effectively blowing the printed material to adhere to the roller. It also avoids gas waste, further reducing energy consumption. Furthermore, the linear nozzle extension, while achieving the same air pressure, allows for miniaturization of the air knife compared to large-diameter nozzles, reducing space requirements and facilitating flexible placement and use.

[0019] In addition, the air knife is designed so that when the roller carrying the printed head rotates past the nozzle, the nozzle of the air knife blows air to flatten the printed material until the printed material has completely passed through the air knife. That is, the air knife provides intermittent air supply. This ingenious design can further reduce the energy consumption of air supply and reduce production costs.

[0020] The detection device in this invention is rationally designed. The lighting unit and the air-blowing flattening unit are covered with protective shields to prevent interference from the surrounding environment. Furthermore, this design prevents ink floating under static electricity from contaminating the camera or the surrounding air, thus creating a favorable environment. In addition, during detection, before the printed material is moved to the designated area, the air-blowing flattening unit first flattens the surface before the camera takes the picture. This ensures that the inspected surface is clearly presented in the image, improving detection accuracy. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0022] Figure 1 : A schematic diagram of the structure of the air-blowing flattening unit in this utility model; Figure 2 : A schematic diagram of the detection device in this utility model; Figure 3 : Figure 2 A magnified schematic diagram of the partial structure at point A in the middle; Figure 4 A magnified schematic diagram of a portion of the air knife; Detailed Implementation The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0023] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing this document and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] In this document, unless otherwise stated, the term "multiple" means two or more.

[0025] In this article, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0026] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0027] like Figure 1The illustrated air-blowing and flattening unit for printed materials includes an air tank 2. The first end of the air tank 2 is connected to an air source 1. In this embodiment, the air source 1 is an air compressor, and the air compressor's motor is electrically connected to a controller via a frequency converter. This enables precise control of the air compressor's output pressure and flow rate, thereby improving energy efficiency, reducing operating costs, and extending equipment lifespan. Figure 1 As shown, a shut-off valve is also installed at the outlet end of the air compressor.

[0028] The second end of the gas storage tank 2 is connected to the inlet of the inner cavity of the air knife 7 through a pipe. A shut-off valve is also provided at the second end of the gas storage tank 2. A first valve body 6 is provided on the pipe near the air knife 7 to control the opening and closing of the pipe. In this embodiment, the first valve body 6 is a solenoid valve. The solenoid valve is electrically connected to an external controller, which facilitates remote control and has a high degree of automation.

[0029] A flow regulating valve 5 is provided on the pipeline connecting the first valve body 6 and the gas storage tank 2 to regulate the air flow and air pressure of the air knife 7. In this embodiment, the flow regulating valve 5 is a ball valve core proportional valve, which has the structural advantages of traditional ball valves, accurately controls the gas flow, and also has the function of proportional control, making it convenient to use.

[0030] like Figure 1 As shown, the outlet of the pipe is connected to the inner cavity of the air knife 7 through several branches to supply air to the air knife 7. These branches are arranged along the axial direction of the air knife 7, ensuring that the gas evenly fills the inner cavity of the air knife 7, which helps improve the uniformity and stability of the air blowing from the nozzle 71 of the air knife 7. The nozzle 71 of the air knife 7 faces the roller 8 to blow air onto and flatten the printed material on it, so that it adheres to the roller 8. In this design, the nozzle 71 of the air knife 7 extends linearly along the roller axis and includes multiple spaced sub-nozzles. These sub-nozzles are designed so that the gas within the air knife 7 diffuses outward in a fan shape across the width of the roller 8 and covers the axial width of the roller 8. The design of the nozzle 71 in this application ensures, on the one hand, that the released gas has sufficient pressure and good directionality, effectively blowing the printed material to adhere to the roller 8; on the other hand, it avoids gas waste, further reducing energy consumption. Furthermore, the linear extension of the nozzles also facilitates the miniaturization of the air knife, reducing space occupation and allowing for flexible arrangement and use. Additionally, it avoids the need for a sufficiently large or structurally complex internal cavity to buffer the gas and ensure stable and balanced blowing.

[0031] In this embodiment, as Figure 4 As shown, the bottom surface of the inner diameter of the nozzle 71 extends outward to form a tongue plate. When the gas diffuses outward through the nozzle 71, the tongue plate can guide and gather the gas, causing the gas to diffuse forward and upward outward and blow onto the surface of the printed material to be inspected. The structure is simple, which helps to improve the blowing and flattening effect and reduce waste.

[0032] Among them, the air knife 7 nozzle 71 is designed such that the air flow rate and air pressure of the nozzle 7 are positively correlated with the weight of the printed matter. That is, when the printed matter, such as paper, has a small weight, the air flow rate and air pressure are small, and the corresponding air flow rate and air pressure are large when the weight is large.

[0033] In this embodiment, as Figure 2 As shown, the air knife 7 is mounted on the frame 100 and is rotatably mounted on the two vertical plates of the frame 100 to facilitate adjustment of the relative angle and distance between the nozzle 71 and the roller 8, thereby improving the flexibility of use and avoiding the need to adapt to the air blowing requirements of printed materials by changing the air source 1 under certain circumstances.

[0034] Furthermore, to further reduce energy consumption, in this embodiment, the air knife 7 is designed such that after the roller 8 carrying the head of the printed material rotates past the nozzle 71, the nozzle 71 of the air knife 7 blows air to flatten the printed material, and the air knife 7 then passes the nozzle 71 at the tail end of the printed material. That is, the air knife 7 provides intermittent air supply, a clever design that can further and significantly reduce air supply energy consumption and lower production costs.

[0035] like Figure 2 and 3 The printed matter inspection device shown includes an imaging unit 9, an illumination unit 10, and a printed matter blowing and flattening unit as described above; The imaging unit 9 is used to capture images of the printed surface to be inspected on the roller 8 within a set area. It includes a camera, which is existing technology and can be selected by those skilled in the art according to their needs. The imaging unit 9 can transmit the captured image data to an external control unit to analyze whether there are defects in the image of the inspected surface and process them in a timely manner. The imaging unit 9 is connected to the frame 100 with an adjustable angle.

[0036] The illumination unit 10 is used to illuminate the inspection surface image within the set area. This is existing technology and will not be described in detail here. The illumination unit 10 is connected to the frame 100 with an adjustable angle.

[0037] The air-blowing flattening unit is used to blow air onto the inspected surface of the printed material in the designated area and flatten it onto the roller 8. The air-blowing flattening unit is designed to blow air onto the inspected surface before it moves to the designated area, thus ensuring that the image of the inspected surface is flat and wrinkle-free when it is captured by the imaging unit, thereby improving the accuracy of image visual recognition.

[0038] like Figure 3As shown, the lighting unit 10 and the air blowing flattening unit are covered by a protective cover 11. The protective cover 11 is provided with a light-transmitting plate for the imaging unit 9 to capture images. In this embodiment, the light-transmitting plate includes a transparent window and a transparent cover plate 12. The transparent window is embedded in a notch on the protective cover 11. One end of the transparent cover plate 12 is hinged to the protective cover 11. The transparent cover plate 12 can cover the transparent window. Two screws pass through the other end of the transparent cover plate 12 and are connected to the transparent cover plate 12. This ensures that the transparent window remains clean while the imaging unit 9 is working normally, and also makes it easy to clean the transparent cover plate 90.

[0039] The detection method of the detection device described above includes the following steps: A. The head of the printed material is attached to the roller 8 and rotates with the roller. In this embodiment, the gripper transfers the head of the printed material to the roller 8 and rotates with the roller 8. B. Before the surface of the printed material to be inspected is moved to the set area, in this embodiment, the set area is the shooting area of ​​the subject being photographed, and the air blowing and flattening unit blows air to flatten the surface to be inspected. C. When the inspected surface of the printed material is moved to the set area, the imaging unit 9 captures an image of the inspected surface and sends it to the external detection unit, and the illumination unit 10 illuminates the inspected surface. In one workflow, the air-blowing process of the air knife 7 is designed such that, before the printed material is inspected and moved to the designated area, and after the head of the printed material passes the nozzle 71 of the air knife 7, the nozzle 71 blows air onto the printed material to flatten it. In this embodiment, the air knife 7 stops blowing air when the tail of the printed material approaches the nozzle 71 of the air knife 7, in order to reduce the energy consumption of the air knife 7. In other embodiments of this invention, the air knife 7 may also stop blowing air after the tail of the printed material has rotated past the nozzle 71 of the air knife 7, ensuring that the printed material adheres well to the roller 8.

[0040] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A printed matter air-blowing flattening unit, characterized in that, include: Gas storage tank (2), the inlet end of which is connected to a gas source to store gas; Air knife (7), the inlet of the air knife (7) is connected to the outlet end of the air tank (2), the nozzle (71) of the air knife (7) faces the roller (8) to blow air and flatten the printed matter on it, so that the printed matter is attached to the roller (8), and the nozzle (71) of the air knife (7) extends linearly along the axis of the roller (8). The nozzle (71) of the air knife (7) is designed such that the air flow rate and air pressure of the nozzle (71) are positively correlated with the weight of the printed matter.

2. The printed matter blowing and flattening unit according to claim 1, characterized in that, The linearly extended nozzle (71) includes a plurality of spaced sub-nozzles, which are designed such that the gas in the air knife (7) diffuses outward in a fan shape across the width of the roller (8).

3. The printed matter blowing and flattening unit according to claim 1, characterized in that, The nozzle (71) of the air knife (7) is designed such that when the roller (8) carrying the printed head rotates past the nozzle (71), the nozzle (71) of the air knife (7) blows air to flatten the printed matter.

4. The printed matter blowing and flattening unit according to any one of claims 1 to 3, characterized in that, A flow regulating valve and a first valve body are sequentially provided on the pipeline connecting the gas storage tank (2) and the air knife (7) along the airflow direction. The flow regulating valve is used to regulate the airflow and air pressure of the air knife (7), and the first valve body is used to regulate the opening and closing of the pipeline.

5. The printed matter blowing and flattening unit according to claim 4, characterized in that, The air source is an air compressor, and the motor of the air compressor is electrically connected to the controller via a frequency converter.

6. A printing inspection device, characterized in that, It includes a shooting unit (9), an illumination unit (10), and a printed matter blowing and flattening unit as described in any one of claims 1 to 3 and 5; The imaging unit (9) is used to capture an image of the inspected surface of the printed matter on the roller (8) in a set area; The lighting unit (10) is used to illuminate the inspection surface image within a set area; The air-blowing flattening unit is used to blow air to flatten the inspected surface of the printed matter and to make it adhere to the roller (8). The air-blowing flattening unit is designed to blow air to flatten the inspected surface before the inspected surface of the printed matter is moved to a set area.

7. The printed matter inspection device according to claim 6, characterized in that, The air knife (7) is parallel to the axis of the roller (8), and the angle of the air knife (7) is adjustable to facilitate the adjustment of the relative angle and distance between the nozzle (71) and the roller (8); the lighting unit (10) is parallel to the axis of the roller (8), and the angle of the lighting unit (10) is adjustable to adjust the lighting area on the roller (8); the shooting unit (9) is adjustable to adjust the position of the set area for shooting on the roller (8).

8. The printed matter inspection device according to claim 7, characterized in that, The lighting unit (10) and the air blowing flattening unit are covered with a protective cover (11), and the protective cover (11) is provided with a light-transmitting plate for the shooting unit (9) to take pictures and form images.

9. The printed matter inspection device according to claim 8, characterized in that, The light-transmitting plate includes a transparent window and a transparent cover plate (12). The transparent window is embedded in a notch on the protective cover (11). One end of the transparent cover plate (12) is hinged to the protective cover (11). The transparent cover plate (12) can cover the transparent window. The other end of the transparent cover plate (12) is connected to the protective cover (11).

Images