Protective printing roller of multicolor printing machine

Abstract

The utility model relates to a protective printing roller of a multicolor printing machine, which comprises a support frame, a printing roller rotatably connected to the support frame and a protective cover arranged on the support frame, more than two mounting grooves arranged side by side are arranged on the surface of the protective cover facing the printing roller, and adsorption cotton is respectively arranged in the more than two mounting grooves. According to the protective printing roller of the multicolor printing machine, the surface, facing the printing roller, of the protective cover is provided with more than two installing grooves which are arranged side by side, each installing groove is internally provided with one piece of adsorption cotton, and the adsorption cotton can effectively adsorb and remove redundant printing ink and impurities generated in the printing process; the harmful effect of the pollutants on the printing quality is prevented, the abrasion to the printing roller can be reduced to a certain extent, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of printing, in particular to a protective printing roller of a multi-color printing machine. Background Art

[0002] In the traditional printing process, the printing roller will inevitably produce excess ink and various impurities during operation. These pollutants have a negative effect on the printing quality, which may not only cause color difference, blur or other visual defects in the printed products, but also accelerate the wear of the printing roller over a long period of time, thereby shortening the effective use cycle of the equipment. This situation urgently requires us to seek improvement measures to optimize the printing quality and extend the service life of the printing equipment. Utility Model Content

[0003] In view of this, the utility model provides a protective printing roller of a multi-color printing machine, and the surface of the protective cover facing the printing roller is provided with more than two side-by-side mounting grooves, and each mounting groove is provided with an adsorption cotton. These adsorption cottons can not only effectively absorb and remove excess ink and impurities generated during the printing process to prevent these pollutants from having an adverse effect on the printing quality, but also can reduce the wear on the printing roller to a certain extent and extend the service life of the equipment.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A protective printing roller of a multi-color printing machine comprises a support frame, a printing roller rotatably connected to the support frame, and a protective cover arranged on the support frame. The surface of the protective cover facing the printing roller is provided with more than two mounting grooves arranged side by side, and an adsorption cotton is respectively arranged in the more than two mounting grooves.

[0006] The core feature of the protective printing roller is its unique protective cover design. The surface of the protective cover facing the printing roller is provided with more than two mounting grooves arranged side by side, and each mounting groove is provided with an adsorbent cotton. These adsorbent cottons play a vital role. They can not only effectively absorb and remove excess ink and impurities generated during the printing process to prevent these pollutants from adversely affecting the printing quality, but also reduce the wear on the printing roller to a certain extent and extend the service life of the equipment. And because the adsorbent cotton can be easily put in and out of the mounting groove, when the adsorbent cotton needs to be replaced or cleaned, the operator can complete it quickly, which greatly saves time and labor costs. At the same time, due to its simple structure and easy maintenance, it greatly reduces maintenance costs and downtime in actual applications.

[0007] Preferably, the protective cover is in the shape of a curved surface, and the mounting groove is dug inside the protective cover.

[0008] The shape of the protective cover is a curved surface, and the curved surface shape makes the contact between the adsorption cotton and the printing roller closer, thereby improving the adsorption effect.

[0009] Preferably, the mounting groove includes a flat rectangular inner groove and an opening connected to the inner groove, the adsorbent cotton is also flat rectangular and fills the inner groove, and the middle part of the adsorbent cotton is connected to the outside through the opening and faces the printing roller.

[0010] The mounting groove includes a flat rectangular inner groove and an opening connected to the inner groove. The adsorbent cotton is also flat rectangular and fills the inner groove. This design allows the adsorbent cotton to be evenly distributed in the inner groove and give full play to its adsorption function. The flat rectangular shape helps to increase the contact area with the printing roller and improve the adsorption efficiency. At the same time, the design of the opening allows the adsorbent cotton to expand and contract freely to adapt to different working conditions and ensure that the adsorption effect is always stable. The middle part of the adsorbent cotton is connected to the outside world through the opening and faces the printing roller. This design helps the adsorbent cotton to quickly respond to changes in the printing process and absorb excess ink and impurities in time. At the same time, the position of the opening allows the adsorbent cotton to more easily absorb excess ink and impurities, improving the protection ability.

[0011] Preferably, the two or more mounting grooves extend along the same curve as the curved surface of the protective cover.

[0012] The two or more mounting grooves extend along the same curve as the protective cover, which makes the entire protective cover look more harmonious and unified, and also helps to improve the overall stability and durability. The extension of the mounting groove matches the curve of the protective cover, so that the adsorption cotton always maintains a stable position during the printing process, improving the printing quality.

[0013] Preferably, the two or more mounting grooves are located on the same curved surface.

[0014] Two or more mounting slots are on the same curved surface, making the entire protective cover look simpler and more beautiful, and also convenient for operation and maintenance. Since all mounting slots are on the same plane, operators can work more conveniently when replacing or cleaning the absorbent cotton without worrying about operational difficulties caused by angle problems. In addition, mounting slots on the same curved surface also help improve overall stability and durability, and reduce deformation and damage caused by uneven force.

[0015] Preferably, the opening is formed by a first clamping plate and a second clamping plate that are opposite to each other, and the opening is a gap between the first clamping plate and the second clamping plate.

[0016] The opening is formed by the first and second clamping plates facing each other. The opening is the gap between the first and second clamping plates. The structure of the clamping plates is cleverly used to form the opening, which not only ensures the size and shape of the opening, but also increases the structural strength of the entire protective cover. The opposing clamping plates can effectively fix the adsorption cotton to prevent it from shifting or falling off during the printing process. At the same time, the gap design allows the adsorption cotton to expand and contract freely to adapt to different working conditions and ensure that the adsorption effect is always stable.

[0017] Preferably, the first clamping plate and the second clamping plate are integrally connected to the protective cover.

[0018] The first clamping plate and the second clamping plate are integrally connected with the protective cover, making the entire protective cover more compact and strong, and also convenient for manufacturing and assembly. The integral connection method can reduce the gap and looseness between the components, improve the overall sealing and stability. In addition, it also helps to reduce production costs and improve production efficiency, bringing more economic benefits to the enterprise.

[0019] Preferably, the inner groove is formed by semi-enclosing the first clamping plate, the second clamping plate and the protective cover, and the adsorption cotton is attached to the first clamping plate and the second clamping plate.

[0020] The inner tank is formed by the first clamping plate, the second clamping plate and the protective cover being semi-enclosed, and the adsorption cotton is attached to the first clamping plate and the second clamping plate, so that the adsorption cotton can be closely attached to the inner wall of the inner tank, thereby improving the adsorption effect. The semi-enclosed structure of the first clamping plate, the second clamping plate and the protective cover not only increases the contact area between the adsorption cotton and the printing roller, but also can effectively fix the position of the adsorption cotton to prevent it from shifting or falling off during the printing process. This tightly fitting design helps to improve the printing quality, reduce the residual ink and impurities, and extend the service life of the equipment.

[0021] Preferably, the two or more mounting grooves have the same outer dimensions.

[0022] When two or more mounting slots have the same dimensions, the entire protective cover looks neater and more beautiful, and is also easier to operate and maintain. The same dimensions mean that all mounting slots can use the same specifications of absorbent cotton, simplifying inventory management and maintenance. In addition, it helps to improve overall stability and durability and reduce deformation and damage caused by uneven force.

[0023] Preferably, the center of the curved surface of the protective cover coincides with the center of the printing roller.

[0024] The center of the curved surface of the protective cover coincides with the center of the printing roller, ensuring a perfect fit between the protective cover and the printing roller, so that the adsorbent cotton can be evenly distributed on the surface of the printing roller, improving the ability of the adsorbent cotton to absorb excess ink and impurities.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] The core feature of the protective printing roller of the multi-color printing machine of the utility model lies in its unique protective cover design. The surface of the protective cover facing the printing roller is provided with more than two side-by-side mounting grooves, and each mounting groove is provided with an adsorbent cotton. These adsorbent cottons play a vital role. They can not only effectively absorb and remove excess ink and impurities generated during the printing process to prevent these pollutants from adversely affecting the printing quality, but also reduce the wear on the printing roller to a certain extent and extend the service life of the equipment. And because the adsorbent cotton can be easily put in and out of the mounting groove, when the adsorbent cotton needs to be replaced or cleaned, the operator can complete it quickly, which greatly saves time and labor costs. At the same time, due to its simple structure and easy maintenance, it greatly reduces maintenance costs and downtime in actual applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a structural diagram of the protective printing roller of a multi-color printing press according to Example 1 of the utility model.

[0029] Figure 2 It is a side view of the protective printing roller of the multi-color printing press according to Example 1 of the utility model.

[0030] Figure 3 This is a structural diagram of the protective printing roller of the multi-color printing press according to Example 2 of the utility model. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0033] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the application product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0035] The technical solution in this application will be described below in conjunction with the accompanying drawings. Example 1

[0036] The present embodiment provides a protective printing roller of a multi-color printing machine, including a support frame 10, a printing roller 20 rotatably connected to the support frame 10, and a protective cover 30 arranged on the support frame 10. The protective cover 30 is provided with two side-by-side mounting grooves 31 on the surface facing the printing roller 20, and an adsorption cotton 32 is respectively provided in the two mounting grooves 31.

[0037] The core feature of the protective printing roller is its unique design of the protective cover 30. The surface of the protective cover 30 facing the printing roller 20 is provided with two side-by-side mounting grooves 31, and each mounting groove 31 is provided with an adsorbent cotton 32. These adsorbent cottons 32 play a vital role. They can not only effectively absorb and remove excess ink and impurities generated during the printing process to prevent these pollutants from adversely affecting the printing quality, but also reduce the wear on the printing roller 20 to a certain extent and extend the service life of the equipment. And because the adsorbent cotton 32 can be easily put into and taken out of the mounting groove 31, when the adsorbent cotton 32 needs to be replaced or cleaned, the operator can complete it quickly, which greatly saves time and labor costs. At the same time, due to its simple structure and easy maintenance, it greatly reduces maintenance costs and downtime in actual applications.

[0038] In this embodiment, the protective cover 30 is in the shape of a curved surface, and the mounting groove 31 is dug inside the protective cover 30 .

[0039] The protective cover 30 is in the shape of a curved surface, and the curved surface shape makes the contact between the adsorption cotton 32 and the printing roller 20 closer, thereby improving the adsorption effect.

[0040] In this embodiment, the mounting groove 31 includes a flat rectangular inner groove 311 and an opening 312 connected to the inner groove 311. The adsorbent cotton 32 is also flat rectangular and fills the inner groove 311. The middle part of the adsorbent cotton 32 is connected to the outside through the opening 312 and faces the printing roller 20.

[0041] The mounting groove 31 includes an inner groove 311 in a flat rectangular shape and an opening 312 connected to the inner groove 311. The adsorbent cotton 32 is also in a flat rectangular shape and fills the inner groove 311. Such a design allows the adsorbent cotton 32 to be evenly distributed in the inner groove 311, giving full play to its adsorption function. The flat rectangular shape helps to increase the contact area with the printing roller 20 and improve the adsorption efficiency. At the same time, the design of the opening 312 allows the adsorbent cotton 32 to expand and contract freely, adapt to different working conditions, and ensure that the adsorption effect is always stable. The middle part of the adsorbent cotton is connected to the outside world through the opening 312 and faces the printing roller 20. Such a design helps the adsorbent cotton 32 to quickly respond to changes in the printing process and absorb excess ink and impurities in time. At the same time, the position of the opening 312 allows the adsorbent cotton 32 to more easily absorb excess ink and impurities, thereby improving the protection ability.

[0042] In this embodiment, the two mounting grooves 31 extend along the same curve as the curved surface of the protective cover 30 .

[0043] The two mounting grooves 31 extend along the same curve as the protective cover 30. This design makes the entire protective cover 30 look more harmonious and unified, and also helps to improve the overall stability and durability. The extension of the mounting grooves 31 matches the curve of the protective cover 30, so that the adsorption cotton 32 always maintains a stable position during the printing process, thereby improving the printing quality.

[0044] In this embodiment, the two mounting grooves 31 are located on the same curved surface.

[0045] The two mounting grooves 31 are on the same curved surface, making the entire protective cover 30 look more concise and beautiful, and also convenient for operation and maintenance. Since all mounting grooves 31 are on the same plane, when replacing or cleaning the adsorbent cotton 32, the operator can work more conveniently without worrying about the difficulty of operation caused by angle problems. In addition, the mounting grooves 31 on the same curved surface also help to improve the overall stability and durability, and reduce deformation and damage caused by uneven force.

[0046] In this embodiment, the opening 312 is formed by the first clamping plate 313 and the second clamping plate 314 that are opposite to each other, and the opening 312 is a gap between the first clamping plate 313 and the second clamping plate 314 .

[0047] The opening 312 is formed by the first clamping plate 313 and the second clamping plate 314 which are opposite to each other. The opening 312 is the gap between the first clamping plate 313 and the second clamping plate 314. The structure of the clamping plate is cleverly used to form the opening 312, which not only ensures the size and shape of the opening 312, but also increases the structural strength of the entire protective cover 30. The opposite clamping plates can effectively fix the adsorption cotton 32 to prevent it from shifting or falling off during the printing process. At the same time, the design of the gap allows the adsorption cotton 32 to expand and contract freely, adapt to different working conditions, and ensure that the adsorption effect is always stable.

[0048] In this embodiment, the first clamping plate 313 and the second clamping plate 314 are integrally formed and connected with the protective cover 30 .

[0049] The first clamping plate 313 and the second clamping plate 314 are integrally connected with the protective cover 30, making the entire protective cover 30 more compact and strong, and also convenient for manufacturing and assembly. The integral connection method can reduce the gap and looseness between the components, improve the overall sealing and stability. In addition, it also helps to reduce production costs and improve production efficiency, bringing more economic benefits to the enterprise.

[0050] In this embodiment, the inner groove 311 is formed by semi-enclosing the first clamping plate 313 , the second clamping plate 314 and the protective cover 30 , and the adsorption cotton 32 is attached to the first clamping plate 313 and the second clamping plate 314 .

[0051] The inner groove 311 is formed by the first clamping plate 313, the second clamping plate 314 and the protective cover 30 being semi-enclosed, and the adsorbent cotton 32 is attached to the first clamping plate 313 and the second clamping plate 314, so that the adsorbent cotton 32 can be closely attached to the inner wall of the inner groove 311, thereby improving the adsorption effect. The semi-enclosed structure of the first clamping plate 313, the second clamping plate 314 and the protective cover 30 not only increases the contact area between the adsorbent cotton 32 and the printing roller 20, but also can effectively fix the position of the adsorbent cotton 32 to prevent it from shifting or falling off during the printing process. This tightly fitting design helps to improve the printing quality, reduce the residual ink and impurities, and extend the service life of the equipment.

[0052] In this embodiment, the two mounting grooves 31 have the same outer dimensions.

[0053] The two mounting slots 31 have the same dimensions, which makes the entire protective cover 30 look more neat and beautiful, and is also convenient for operation and maintenance. The same dimensions mean that all mounting slots 31 can use the same specifications of adsorption cotton 32, which simplifies inventory management and maintenance. In addition, it also helps to improve the overall stability and durability and reduce deformation and damage caused by uneven force.

[0054] In this embodiment, the center of the curved surface of the protective cover 30 coincides with the center of the printing roller 20 .

[0055] The center of the curved surface of the protective cover 30 coincides with the center of the printing roller 20, ensuring a perfect fit between the protective cover 30 and the printing roller 20, so that the adsorbent cotton 32 can be evenly distributed on the surface of the printing roller 20, thereby improving the ability of the adsorbent cotton 32 to absorb excess ink and impurities. Example 2

[0056] The present embodiment provides a protective printing roller of a multi-color printing machine, including a support frame 10, a printing roller 20 rotatably connected to the support frame 10, and a protective cover 30 arranged on the support frame 10. The protective cover 30 is provided with three side-by-side mounting grooves 31 on the surface facing the printing roller 20, and an adsorption cotton 32 is respectively provided in the three mounting grooves 31.

[0057] The core feature of the protective printing roller is its unique design of the protective cover 30. The surface of the protective cover 30 facing the printing roller 20 is provided with three side-by-side mounting grooves 31, and each mounting groove 31 is provided with an adsorbent cotton 32. These adsorbent cottons 32 play a vital role. They can not only effectively absorb and remove excess ink and impurities generated during the printing process to prevent these pollutants from adversely affecting the printing quality, but also reduce the wear on the printing roller 20 to a certain extent and extend the service life of the equipment. And because the adsorbent cotton 32 can be easily put into and taken out of the mounting groove 31, when the adsorbent cotton 32 needs to be replaced or cleaned, the operator can complete it quickly, which greatly saves time and labor costs. At the same time, due to its simple structure and easy maintenance, it greatly reduces maintenance costs and downtime in actual applications.

[0058] In this embodiment, the protective cover 30 is in the shape of a curved surface, and the mounting groove 31 is dug inside the protective cover 30 .

[0059] The protective cover 30 is in the shape of a curved surface, and the curved surface shape makes the contact between the adsorption cotton 32 and the printing roller 20 closer, thereby improving the adsorption effect.

[0060] In this embodiment, the mounting groove 31 includes a flat rectangular inner groove 311 and an opening 312 connected to the inner groove 311. The adsorbent cotton 32 is also flat rectangular and fills the inner groove 311. The middle part of the adsorbent cotton 32 is connected to the outside through the opening 312 and faces the printing roller 20.

[0061] The mounting groove 31 includes an inner groove 311 in a flat rectangular shape and an opening 312 connected to the inner groove 311. The adsorbent cotton 32 is also in a flat rectangular shape and fills the inner groove 311. Such a design allows the adsorbent cotton 32 to be evenly distributed in the inner groove 311, giving full play to its adsorption function. The flat rectangular shape helps to increase the contact area with the printing roller 20 and improve the adsorption efficiency. At the same time, the design of the opening 312 allows the adsorbent cotton 32 to expand and contract freely, adapt to different working conditions, and ensure that the adsorption effect is always stable. The middle part of the adsorbent cotton is connected to the outside world through the opening 312 and faces the printing roller 20. Such a design helps the adsorbent cotton 32 to quickly respond to changes in the printing process and absorb excess ink and impurities in time. At the same time, the position of the opening 312 allows the adsorbent cotton 32 to more easily absorb excess ink and impurities, thereby improving the protection ability.

[0062] In this embodiment, the three mounting grooves 31 extend along the same curve as the curved surface of the protective cover 30 .

[0063] The three mounting grooves 31 extend along the same curve as the protective cover 30. This design makes the entire protective cover 30 look more harmonious and unified, and also helps to improve the overall stability and durability. The extension of the mounting grooves 31 matches the curve of the protective cover 30, so that the adsorption cotton 32 always maintains a stable position during the printing process, thereby improving the printing quality.

[0064] In this embodiment, the three mounting grooves 31 are located on the same curved surface.

[0065] The three mounting grooves 31 are on the same curved surface, making the entire protective cover 30 look more concise and beautiful, and also convenient for operation and maintenance. Since all mounting grooves 31 are on the same plane, when replacing or cleaning the adsorbent cotton 32, the operator can work more conveniently without worrying about the difficulty of operation caused by angle problems. In addition, the mounting grooves 31 on the same curved surface also help to improve the overall stability and durability, and reduce deformation and damage caused by uneven force.

[0066] In this embodiment, the opening 312 is formed by the first clamping plate 313 and the second clamping plate 314 that are opposite to each other, and the opening 312 is a gap between the first clamping plate 313 and the second clamping plate 314 .

[0067] The opening 312 is formed by the first clamping plate 313 and the second clamping plate 314 which are opposite to each other. The opening 312 is the gap between the first clamping plate 313 and the second clamping plate 314. The structure of the clamping plate is cleverly used to form the opening 312, which not only ensures the size and shape of the opening 312, but also increases the structural strength of the entire protective cover 30. The opposite clamping plates can effectively fix the adsorption cotton 32 to prevent it from shifting or falling off during the printing process. At the same time, the design of the gap allows the adsorption cotton 32 to expand and contract freely, adapt to different working conditions, and ensure that the adsorption effect is always stable.

[0068] In this embodiment, the first clamping plate 313 and the second clamping plate 314 are integrally formed and connected with the protective cover 30 .

[0069] The first clamping plate 313 and the second clamping plate 314 are integrally connected with the protective cover 30, making the entire protective cover 30 more compact and strong, and also convenient for manufacturing and assembly. The integral connection method can reduce the gap and looseness between the components, improve the overall sealing and stability. In addition, it also helps to reduce production costs and improve production efficiency, bringing more economic benefits to the enterprise.

[0070] In this embodiment, the inner groove 311 is formed by semi-enclosing the first clamping plate 313 , the second clamping plate 314 and the protective cover 30 , and the adsorption cotton 32 is attached to the first clamping plate 313 and the second clamping plate 314 .

[0071] The inner groove 311 is formed by the first clamping plate 313, the second clamping plate 314 and the protective cover 30 being semi-enclosed, and the adsorbent cotton 32 is attached to the first clamping plate 313 and the second clamping plate 314, so that the adsorbent cotton 32 can be closely attached to the inner wall of the inner groove 311, thereby improving the adsorption effect. The semi-enclosed structure of the first clamping plate 313, the second clamping plate 314 and the protective cover 30 not only increases the contact area between the adsorbent cotton 32 and the printing roller 20, but also can effectively fix the position of the adsorbent cotton 32 to prevent it from shifting or falling off during the printing process. This tightly fitting design helps to improve the printing quality, reduce the residual ink and impurities, and extend the service life of the equipment.

[0072] In this embodiment, the three mounting slots 31 have the same outer dimensions.

[0073] The three mounting slots 31 have the same dimensions, making the entire protective cover 30 look more neat and beautiful, while also facilitating operation and maintenance. The same dimensions mean that all mounting slots 31 can use the same specifications of adsorbent cotton 32, simplifying inventory management and maintenance. In addition, it helps to improve the overall stability and durability, and reduce deformation and damage caused by uneven force.

[0074] In this embodiment, the center of the curved surface of the protective cover 30 coincides with the center of the printing roller 20 .

[0075] The center of the curved surface of the protective cover 30 coincides with the center of the printing roller 20, ensuring a perfect fit between the protective cover 30 and the printing roller 20, so that the adsorbent cotton 32 can be evenly distributed on the surface of the printing roller 20, thereby improving the ability of the adsorbent cotton 32 to absorb excess ink and impurities.

[0076] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective printing roller for a multi-color printing press, characterized in that: It comprises a support frame, a printing roller rotatably connected to the support frame, and a protective cover arranged on the support frame. The surface of the protective cover facing the printing roller is provided with more than two installation grooves arranged side by side, and an adsorption cotton is respectively arranged in the more than two installation grooves.

2. The protective printing roller of a multi-color printing press according to claim 1, characterized in that: The shape of the protective cover is a curved surface, and the mounting groove is dug inside the protective cover.

3. The protective printing roller of a multi-color printing press according to claim 1, characterized in that: The installation groove includes a flat rectangular inner groove and an opening connected to the inner groove. The adsorbent cotton is also flat rectangular and fills the inner groove. The middle part of the adsorbent cotton is connected to the outside through the opening and faces the printing roller.

4. The protective printing roller of a multi-color printing press according to claim 3, characterized in that: The two or more mounting grooves extend along the same curve as the curved surface of the protective cover.

5. The protective printing roller of a multi-color printing press according to claim 3, characterized in that: The two or more mounting grooves are located on the same curved surface.

6. The protective printing roller of a multi-color printing press according to claim 3, characterized in that: The opening is formed by the first clamping plate and the second clamping plate which are opposite to each other, and the opening is a gap between the first clamping plate and the second clamping plate.

7. The protective printing roller of a multi-color printing press according to claim 6, characterized in that: The first clamping plate and the second clamping plate are integrally connected with the protective cover.

8. The protective printing roller of a multi-color printing press according to claim 7, characterized in that: The inner groove is formed by semi-enclosing the first clamping plate, the second clamping plate and the protective cover, and the adsorption cotton is attached to the first clamping plate and the second clamping plate.

9. The protective printing roller of a multi-color printing press according to claim 3, characterized in that: The two or more mounting grooves have the same outer dimensions.

10. The protective printing roller of a multi-color printing press according to claim 1, characterized in that: The center of the curved surface of the protective cover coincides with the center of the printing roller.

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