A surface hardness enhanced printing roller and roller printing machine

Abstract

The application provides a surface hardness reinforced printing roller and a roller printing machine, the surface hardness reinforced printing roller is used for the roller printing machine, and the surface hardness reinforced printing roller comprises a roller body, a hardness reinforced layer and a roller shaft; the roller body is in a cylindrical shape and has an outer peripheral surface, the outer peripheral surface is an annular knurling surface provided with a plurality of mesh holes; the hardness reinforced layer is coated on the outer peripheral surface of the roller body, the hardness reinforced layer comprises a first hardness layer and a second hardness layer, the first hardness layer is coated on the outer peripheral surface and completely covers the outer peripheral surface; the second hardness layer is coated on the first hardness layer and completely covers the first hardness layer; the roller shaft is arranged at the two ends of the roller body along the axial direction respectively and is coaxially arranged with the roller body. The surface hardness reinforced printing roller provided by the application can improve the hardness of the printing roller by coating a double-layer hardness reinforced layer on the outer peripheral surface, so that the printing roller is prevented from being scratched by a scraper, and the service life of the printing roller is prolonged.

Description

Technical Field

[0001] This application belongs to the field of printing equipment technology, and more specifically, relates to a printing roller and a roller printing machine with enhanced surface hardness. Background Technology

[0002] Roller printing machines are widely used printing equipment in industries such as packaging, textiles, and decorative building materials. Their main principle is to transfer ink onto the substrate using rollers with recessed patterns. The core printing unit of a roller printing machine typically includes a printing roller and a doctor blade that work together. The doctor blade spreads the ink evenly on the printing roller, which then prints the pattern onto the substrate. However, because the doctor blade is in constant contact with the printing roller, it is prone to scratching the roller, leading to a decrease in printing quality and a reduced lifespan of the printing roller. Utility Model Content

[0003] The purpose of this application is to provide a printing roller with enhanced surface hardness to solve the technical problem in the prior art where printing rollers are easily scratched by doctor blades.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a surface-hardened printing roller for use in a roller printing machine, the surface-hardened printing roller comprising:

[0005] The roller body is cylindrical and has an outer circumferential surface, which is a textured surface with multiple holes;

[0006] A hardness-reinforcing layer is coated on the outer peripheral surface of the roller body. The hardness-reinforcing layer includes a first hardness layer and a second hardness layer. The first hardness layer is coated on the outer peripheral surface and completely covers it; the second hardness layer is coated on top of the first hardness layer and completely covers it; and...

[0007] The rollers are respectively located at both ends of the roller body along the axial direction and are coaxially arranged with the roller body.

[0008] Optionally, the first hardening layer is a chromium coating.

[0009] Optionally, the second hardening layer is a zinc-chromium coating.

[0010] Optionally, the mesh includes a bottom surface and a sidewall; the outer peripheral surface includes a base surface, a bottom surface and a sidewall, with the base surface and the bottom surface connected by the sidewall.

[0011] The first hardness layer covers the bottom and sidewalls of the tank; the second hardness layer covers the bottom and sidewalls of the tank that are coated with the first hardness layer.

[0012] Optionally, the first hardening layer has a first top surface parallel to the base surface, a first bottom surface parallel to the bottom surface of the groove, and a first sidewall parallel to the sidewall of the groove; the second hardening layer has a second top surface parallel to the first top surface, a second bottom surface parallel to the first bottom surface, and a second sidewall parallel to the first sidewall.

[0013] In the radial outward direction along the roller body, the distance from the bottom surface of the groove to the base surface is A, the distance from the base surface to the first top surface is B, and the distance from the first top surface to the second top surface is C, where C≤B≤A.

[0014] Optionally, in the direction of radial outward movement along the roller body, the distance from the bottom surface of the groove to the first bottom surface is A1, the distance from the first bottom surface to the second bottom surface is A2, A2≤A1≤0.5A, and A1≤C.

[0015] Optionally, in the axial direction along the roller body, the distance between the groove sidewall and the first sidewall is D1, the distance between the first sidewall and the second sidewall is D2, D2≤D1≤A1, and D1≤C.

[0016] Optionally, the roller body is a hollow cylindrical shape, and a limiting installation hole is provided at each end of the roller body along the axial direction; one end of the roller shaft is inserted into the limiting installation hole and then fixedly connected to the roller body.

[0017] Optionally, the surface-hardened printing roller also includes a bearing assembly, with a bearing assembly fitted at the end of each roller shaft away from the roller body.

[0018] The bearing assembly includes a first bearing and a second bearing. Along the axial direction of the roller shaft, the first bearing and the second bearing are sleeved on the roller shaft one after the other. Both the first bearing and the second bearing include an inner ring, balls and an outer ring. The inner ring is fixedly sleeved on the roller shaft, and the outer ring is coaxially sleeved around the inner ring. The balls are sandwiched between the outer ring and the inner ring.

[0019] This application also proposes a roller printing machine comprising a surface-hardened printing roller as described above.

[0020] The beneficial effects of the surface-hardened printing roller provided in this application are as follows: Because a hardening layer, including a first hardness layer and a second hardness layer, is provided on the outer circumferential surface of the printing roller body, the hardness of the outer circumferential surface of the roller body can be significantly improved, making the outer circumferential surface of the printing roller less susceptible to scratches by the doctor blade, thereby helping to extend the service life of the printing roller. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the surface hardness-enhancing printing roller provided in an embodiment of this application;

[0023] Figure 2 A side view of a surface-hardened printing roller provided in an embodiment of this application;

[0024] Figure 3 for Figure 2 A cross-sectional view along the S1-S1 direction;

[0025] Figure 4 An exploded view of the surface-hardening printing roller provided in this embodiment of the application (roller shaft and bearing assembly separated).

[0026] Figure 5 An exploded view of a surface-hardening printing roller provided in an embodiment of this application;

[0027] Figure 6 A plan view of a portion of the outer peripheral surface of the roller body provided in an embodiment of this application;

[0028] Figure 7 for Figure 6 A partial structural diagram along the S2-S2 direction.

[0029] Explanation of icon numbers: Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of this application are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0037] This application provides a printing roller with enhanced surface hardness.

[0038] Please see Figures 1 to 7In one embodiment, the surface-hardened printing roller is used in a roller printing machine. Specifically, the surface-hardened printing roller includes a roller body 100, a hardness-enhancing layer 200, and a roller shaft 300. The roller body 100 is cylindrical and has an outer peripheral surface, which is a textured surface with multiple cells 110. The hardness-enhancing layer 200 is coated on the outer peripheral surface of the roller body 100 and includes a first hardness layer 210 and a second hardness layer 220. The first hardness layer 210 is coated on the outer peripheral surface and completely covers it; the second hardness layer 220 is coated on the first hardness layer 210 and completely covers it. The roller shaft 300 is respectively disposed at both ends of the roller body 100 along the axial direction and is coaxially arranged with the roller body 100.

[0039] Based on this design, in this embodiment, since a hardness strengthening layer 200 including a first hardness layer 210 and a second hardness layer 220 is provided on the outer peripheral surface of the roller body 100 of the printing roller, the hardness of the outer peripheral surface of the roller body 100 can be significantly improved, making the outer peripheral surface of the printing roller less likely to be scratched by the doctor blade, thereby helping to extend the service life of the printing roller.

[0040] It should be noted that in this embodiment, the first hardness layer 210 is preferably a chromium coating. It is understood that in the actual printing process, the continuous scraping of the non-cell 110 portion of the outer peripheral surface of the roller body 100 by the doctor blade at a certain pressure and angle is a high-friction, high-wear process. Chromium, as one of the hardest known metals, can significantly increase the hardness of the outer peripheral surface of the roller body 100 through the chromium coating first hardness layer 210, thereby greatly improving the wear resistance of the outer peripheral surface of the roller body 100, more effectively resisting repeated scraping by the doctor blade, and significantly extending the service life of the roller body 100. Furthermore,

[0041] Furthermore, in this embodiment, the second hardness layer 220 is preferably a zinc-chromium coating. Here, the zinc-chromium coating is also known as a DRC (Dacromet) layer, which has the functions of anti-sticking and anti-static. Of course, in other embodiments, the first hardness layer 210 and the second hardness layer 220 can also be made of other suitable materials, as long as they can effectively improve the hardness of the outer peripheral surface of the roller body 100, and no particular limitation is made here.

[0042] Please see Figure 6 and Figure 7In this embodiment, the mesh 110 includes a bottom surface 111 and a sidewall 112; the outer peripheral surface includes a base surface 119, the bottom surface 111, and the sidewall 112, with the base surface 119 and the bottom surface 111 connected by the sidewall 112. A first hardness layer 210 covers the bottom surface 111 and the sidewall 112; a second hardness layer 220 covers the bottom surface 111 and the sidewall 112 coated with the first hardness layer 210. In other words, both the first hardness layer 210 and the second hardness layer 220 cover the mesh 110 portion of the roller body 100. It is understandable that when the first hardness layer 210 is preferably a chromium coating and the second hardness layer 220 is preferably a zinc-chromium coating, the first hardness layer 210, in addition to improving surface hardness, can also achieve good corrosion resistance through the strong chemical inertness of chromium. This provides a reliable protective barrier for the roller body 100, preventing ink solvents and cleaning agents from corroding the base material of the roller body 100, thereby extending the life of the printing roller. When the second hardness layer 220 is preferably a zinc-chromium coating, its anti-sticking and anti-static properties further enhance corrosion resistance and improve printing quality.

[0043] Specifically, such as Figure 7 As shown, in this embodiment, the first hardening layer 210 has a first top surface 113 parallel to the base surface 119, a first bottom surface 114 parallel to the groove bottom surface 111, and a first sidewall 115 parallel to the groove sidewall 112. The second hardening layer 220 has a second top surface 116 parallel to the first top surface 113, a second bottom surface 117 parallel to the first bottom surface 114, and a second sidewall 118 parallel to the first sidewall 115. In the radially outward direction along the roller body 100, the distance from the groove bottom surface 111 to the base surface 119 is A, the distance from the base surface 119 to the first top surface 113 is B, and the distance from the first top surface 113 to the second top surface 116 is C, where C≤B≤A. In other words, relative to the base surface 119 and the first top surface 113, the thickness of the first hardness layer 210 and the second hardness layer 220 in the radial direction along the roller body 100 is less than or equal to the depth of the cell 110. This allows the depth of the cell 110 after being coated with the double hardness layer to be controlled within a suitable range, without causing adverse effects on the printing effect due to the cell 110 being too deep or too shallow.

[0044] Furthermore, in the radially outward direction along the roller body 100, the distance from the bottom surface 111 of the groove to the first bottom surface 114 is A1, and the distance from the first bottom surface 114 to the second bottom surface 117 is A2, where A2≤A1≤0.5A and A1≤C. In other words, the cell 110 without the first hardness layer 210 and the second hardness layer 220 is considered the original cell, and the cell 110 after being coated with the first hardness layer 210 and the second hardness layer 220 is considered the hardened cell. The total coating thickness of the first hardness layer 210 and the second hardness layer 220 on the bottom surface 111 of the groove should not exceed the depth of the original cell, and the thickness of the first hardened layer or the second hardened layer on the bottom surface 111 of the groove should be less than its thickness relative to the base surface 119 or the first top surface 113, so that the depth of the hardened cell is within a suitable range and thus will not have a significant impact on the printing effect.

[0045] Furthermore, along the axial direction of the roller body 100, the distance between the groove sidewall 112 and the first sidewall 115 is D1, and the distance between the first sidewall 115 and the second sidewall 118 is D2, where D2≤D1≤A1 and D1≤C. This allows the first and second hardened layers to be relatively thin on the groove sidewall 112, thus minimizing the reduction in the cross-sectional area of ​​the original cells and consequently minimizing the impact on the printing effect.

[0046] Please see Figures 1 to 5 In this embodiment, the roller body 100 is a hollow cylindrical shape, and a limiting mounting hole 120 is provided at each of its two axial ends; one end of the roller shaft 300 is inserted into the limiting mounting hole 120 and then fixedly connected to the roller body 100. Here, the hollow design of the roller body 100 helps to reduce the weight of the roller body 100 and the amount of material used, thereby reducing the cost of the printing roller. Specifically, as follows... Figure 3 As shown, a first limiting step is formed at both ends of the roller body 100 along the axial direction. The inner wall surface of the first limiting step forms a limiting mounting hole 120. That is, the diameter of the limiting mounting hole 120 is larger than the diameter of the hollow inner cavity of the roller body 100. The end face of the roller shaft 300 that extends into the limiting mounting hole 120 abuts against the surface of the first limiting step, thereby realizing the limiting mounting of the roller shaft 300 and the roller body 100.

[0047] Furthermore, such as 1, Figure 4 and Figure 5As shown, in this embodiment, the surface-hardened printing roller also includes a bearing assembly 400. A bearing assembly 400 is fitted onto the end of each of the two roller shafts 300 furthest from the roller body 100. Specifically, the bearing assembly 400 includes a first bearing 410 and a second bearing 420. Along the axial direction of the roller shaft 300, the first bearing 410 and the second bearing 420 are fitted onto the roller shaft 300 one after the other. Both the first bearing 410 and the second bearing 420 include an inner ring 430, a ball bearing 450, and an outer ring 440. The inner ring 430 is fixedly fitted onto the roller shaft 300, and the outer ring 440 is coaxially fitted around the inner ring 430. The ball bearing 450 is sandwiched between the outer ring 440 and the inner ring 430. Of course, a single bearing can be used in other embodiments, but in this embodiment, the dual bearing configuration can significantly improve the bearing's load-bearing capacity, effectively reduce the load on a single bearing, greatly increase the stability of the roller body 100 and roller shaft 300 during rotation, improve the service life and reliability of the printing roller, and thus help improve printing quality.

[0048] This application also proposes a roller printing machine, which includes the aforementioned surface-hardened printing roller. The specific structure of the surface-hardened printing roller is as described in the above embodiments. Since this roller printing machine adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A surface-hardened printing roller for use in a roller printing machine, characterized in that, The surface-hardened printing roller includes: The roller body is cylindrical and has an outer peripheral surface, which is a textured surface with multiple holes; A hardness-enhancing layer is coated on the outer peripheral surface of the roller body. The hardness-enhancing layer includes a first hardness layer and a second hardness layer. The first hardness layer is coated on the outer peripheral surface and completely covers it. The second hardness layer is coated on top of the first hardness layer and completely covers it. Rollers are respectively located at both ends of the roller body along the axial direction and are coaxially arranged with the roller body.

2. The surface-hardened printing roller as described in claim 1, characterized in that, The first hardening layer is a chromium coating.

3. The surface-hardened printing roller as described in claim 1, characterized in that, The second hardening layer is a zinc-chromium coating.

4. The surface-hardened printing roller as described in claim 1, characterized in that, The mesh includes a bottom surface of the groove and a side wall of the groove; the outer peripheral surface includes a base surface, the bottom surface of the groove and the side wall of the groove, and the base surface and the bottom surface of the groove are connected through the side wall of the groove; The first hardness layer covers the bottom surface of the tank and the sidewall of the tank; the second hardness layer covers the bottom surface of the tank and the sidewall of the tank on which the first hardness layer is coated.

5. The surface-hardened printing roller as described in claim 4, characterized in that, The first hardening layer has a first top surface parallel to the base surface, a first bottom surface parallel to the bottom surface of the groove, and a first sidewall parallel to the sidewall of the groove; the second hardening layer has a second top surface parallel to the first top surface, a second bottom surface parallel to the first bottom surface, and a second sidewall parallel to the first sidewall; In the radially outward direction along the roller body, the distance from the bottom surface of the groove to the base surface is A, the distance from the base surface to the first top surface is B, and the distance from the first top surface to the second top surface is C, where C≤B≤A.

6. The surface-hardened printing roller as described in claim 5, characterized in that, In the radially outward direction along the roller body, the distance from the bottom surface of the groove to the first bottom surface is A1, the distance from the first bottom surface to the second bottom surface is A2, A2≤A1≤0.5A, and A1≤C.

7. The surface-hardened printing roller as described in claim 6, characterized in that, Along the axial direction of the roller body, the distance between the groove sidewall and the first sidewall is D1, the distance between the first sidewall and the second sidewall is D2, D2≤D1≤A1, and D1≤C.

8. The surface-hardening printing roller according to any one of claims 1 to 7, characterized in that, The roller body is a hollow cylindrical shape, and a limiting installation hole is provided at each of the two ends of the roller body along the axial direction; one end of the roller shaft is inserted into the limiting installation hole and then fixedly connected to the roller body.

9. The surface-hardened printing roller as described in claim 8, characterized in that, The surface hardness-enhanced printing roller also includes a bearing assembly, and a bearing assembly is fitted at the end of each of the two roller shafts away from the roller body. The bearing assembly includes a first bearing and a second bearing. Along the axial direction of the roller shaft, the first bearing and the second bearing are sleeved on the roller shaft one after the other. Both the first bearing and the second bearing include an inner ring, balls, and an outer ring. The inner ring is fixedly sleeved on the roller shaft, and the outer ring is coaxially sleeved around the inner ring. The balls are sandwiched between the outer ring and the inner ring.

10. A roller printing machine, characterized in that, Including the surface hardness-enhanced printing roller as described in any one of claims 1 to 9.

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