A magnetic roller and its processing method

Abstract

The present invention discloses a magnetic roller and a processing method thereof. The magnetic roller includes a roller body, an adhesive layer, and a magnetic strip portion. The roller body is evenly provided with a plurality of installation grooves along its circumferential side wall, and the bottom of each installation groove is provided with a plurality of equally spaced arc-shaped grooves; the magnetic strip portion is adhered to the arc-shaped grooves through the adhesive layer; the magnetic strip portion includes at least one first magnetic strip portion and at least one second magnetic strip portion, and the magnetic induction intensity of the first magnetic strip portion is higher than that of the second magnetic strip portion. The use of equally spaced arc-shaped grooves increases the roughness of the bottom of the installation groove, so that the adhesive layer can be coated more evenly and firmly at the bottom of the installation groove, improving the adhesion strength between the magnetic strip portion and the installation groove; the first magnetic strip portion with a higher magnetic induction intensity is used to simultaneously adsorb the two front and rear butted free ends of the flexible printing plate, so that the two free ends of the flexible printing plate bent along the circumferential direction of the roller body do not misalign, ensuring the fitting degree of the flexible printing plate on the roller body.

Description

Technical Field

[0001] The present invention relates to the technical field of printing labels and label die-cutting equipment, and particularly relates to a magnetic roller and a processing method thereof. Background Art

[0002] In the technical field of printing labels and label die-cutting, a flexible die-cutting plate is adsorbed on a roller with magnetic adsorption ability, and by rotating the roller, the die-cutting plate is used to cut out a specified shape on the material.

[0003] However, in the prior art, since the materials to be die-cut are thick and thin, hard and soft, when facing materials with different characteristics, the force on the flexible die-cutting plate will change, which may cause misalignment on the roller, and the magnetic parts on the roller are also prone to detachment from the roller due to their relatively smooth surface, resulting in unstable positioning. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this reason, the purpose of the present invention is to provide a magnetic roller and a processing method thereof to solve the problems such as insufficient adsorption capacity of the magnetic roller for the flexible die-cutting plate and easy detachment of the magnetic parts in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a magnetic roller for magnetically adsorbing a flexible die-cutting plate, including:

[0007] A roller body, on which a plurality of installation grooves are uniformly formed along its circumferential side wall, and a plurality of equidistant arc-shaped grooves are provided at the bottom of each installation groove;

[0008] An adhesive layer, coated on the arc-shaped grooves;

[0009] A magnetic strip part, including at least one first magnetic strip part and at least one second magnetic strip part, each first magnetic strip part or second magnetic strip part is attached to the corresponding installation groove through the adhesive layer, the magnetic induction intensity of the first magnetic strip part is higher than that of the second magnetic strip part, and one of the first magnetic strip parts is used to simultaneously adsorb two front and rear butt-jointed free ends of the flexible die-cutting plate.

[0010] In some embodiments, the surface roughness range of the bottom surface of the installation groove is Ra25 - Ra50μm.

[0011] In some embodiments, the magnetic strip portion includes a permanent magnet and a magnetic pole plate. The permanent magnet and the magnetic pole plate are alternately arranged in the installation groove. A first positioning mechanism is provided on the side surface of the permanent magnet and / or the magnetic pole plate that contacts the groove wall of the installation groove, and a second positioning mechanism that is engaged with the first positioning mechanism is provided on the groove wall of the installation groove.

[0012] In some embodiments, a third positioning mechanism is provided on the side surface of the permanent magnet that contacts the magnetic pole plate, and a fourth positioning mechanism that is engaged with the third positioning mechanism is provided on the side surface of the magnetic pole plate. The permanent magnet and the magnetic pole plate form the magnetic strip portion through the engagement of the third positioning mechanism and the fourth positioning mechanism.

[0013] In some embodiments, the permanent magnet includes an upper permanent magnet portion and a lower permanent magnet portion. The length of the upper permanent magnet portion is greater than the length of the lower permanent magnet portion. The third positioning mechanism is provided on the upper permanent magnet portion, and the first positioning mechanism is provided on the lower permanent magnet portion;

[0014] The magnetic pole plate includes an upper magnetic conduction portion and a lower magnetic conduction portion. The length of the upper magnetic conduction portion is greater than the length of the lower magnetic conduction portion. The fourth positioning mechanism is provided on the upper magnetic conduction portion, and the first positioning mechanism is provided on the lower magnetic conduction portion;

[0015] The second positioning mechanism is provided at the lower part of the groove wall of the installation groove.

[0016] In some embodiments, along the circumferential direction, the same number of the second magnetic strip portions are arranged between every two of the first magnetic strip portions.

[0017] In some embodiments, the first magnetic strip portion for adsorbing the free end of the flexible printing plate further has a positioning groove line that is recessed inward. A positioning pin hole is provided on one side of the positioning groove line. The left and right sides of the positioning groove line are simultaneously abutted against the two free ends of the flexible printing plate.

[0018] In a second aspect, an embodiment of the present application provides a processing method for producing the magnetic roller as described above, including the following steps:

[0019] Step S1: Rough-turn the roller body from the blank steel;

[0020] Step S2: Uniformly mill a plurality of installation grooves along the circumferential side wall of the roller body, control the milling cutter to move forward in a pause pattern at equal intervals, and form an arc-shaped groove at the pause;

[0021] Step S3: Coat an adhesive layer in the installation groove;

[0022] Step S4: Attach the pre-assembled magnetic strip portion to the corresponding installation groove, and apply a pressing force to the magnetic strip portion for shaping;

[0023] Step S5: Dry and cure the magnetic strip part;

[0024] Step S6: Rough grind the common outer surface of the magnetic strip part and the roller body;

[0025] Step S7: Finish grind the common outer surface of the magnetic strip part and the roller body.

[0026] In some embodiments, in step S4:

[0027] First, attach the first magnetic strip part with the positioning groove lines to the initial installation groove, and along the circumferential direction, place N second magnetic strip parts in the corresponding installation grooves in sequence;

[0028] Place another first magnetic strip part in the next installation groove, and then place N second magnetic strip parts in the corresponding installation grooves in sequence;

[0029] And so on, until all the installation grooves are attached with magnetic strip parts.

[0030] In some embodiments, in step S7, the surface roughness range of the outer surface of the magnetic strip part and the roller body after finish grinding is less than Ra1μm.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] The magnetic roller and its processing method provided by the embodiments of the present application use equidistant arc-shaped grooves to increase the roughness of the bottom of the installation groove, so that the adhesive layer can be coated more evenly and firmly at the bottom of the installation groove, improving the adhesion strength between the magnetic strip part and the installation groove; use the first magnetic strip part with higher magnetic induction intensity to simultaneously adsorb the two front and back butted free ends of the flexible printing plate, so that the two free ends of the flexible printing plate bent along the circumferential direction of the roller body do not misalign, ensuring the fitting degree of the flexible printing plate on the roller body.

[0033] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. Description of the Drawings

[0034] The present invention is further described with the accompanying drawings, but the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the following drawings without creative efforts.

[0035] Figure 1 It is a schematic diagram of the state of a magnetic roller provided by the present invention when adsorbing a flexible printing plate.

[0036] Figure 2 It is a structural schematic diagram of a magnetic roller provided by the present invention.

[0037] Figure 3An unfolded schematic diagram when assembling the magnetic strip part for the magnetic roller provided by the present invention.

[0038] Figure 4 It is a schematic diagram of the cooperation relationship between the adhesive layer and the arc-shaped groove under one implementation manner.

[0039] Figure 5 It is a schematic diagram of the cooperation relationship between the adhesive layer and the arc-shaped groove under another implementation manner. Specific implementation manner

[0040] Next, the technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention 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 of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0043] For technologies, methods, and devices known to those of ordinary skill in the relevant fields, they may not be discussed in detail, but in appropriate cases, the said technologies, methods, and devices should be regarded as part of the specification.

[0044] Refer to Figures 1 to 5 In the first aspect, this embodiment provides a magnetic roller for magnetically adsorbing a flexible printing plate 40, including:

[0045] The roller body 10 is evenly provided with a plurality of mounting grooves 11 on its circumferential side wall. The bottom of each mounting groove 11 is provided with a plurality of equally spaced arc-shaped grooves 12. The width of the arc-shaped groove 12 is equal to the width of the bottom of the mounting groove 11. Preferably, the shape of the arc-shaped groove 12 is semi-circular and extends along the axial direction at the bottom of the mounting groove 11, and the distance between two arc-shaped grooves 12 is equal;

[0046] The adhesive layer 20 is coated on the arc-shaped groove 12. The adhesive layer 20 is used to adhere the magnetic strip portion 30 in the mounting groove 11;

[0047] The magnetic strip portion 30 includes at least one first magnetic strip portion 31 and at least one second magnetic strip portion 32. Each first magnetic strip portion 31 or second magnetic strip portion 32 is attached to the corresponding mounting groove 11 through the adhesive layer 20. The magnetic strip portion 30 is strip-shaped, and the side surfaces around it are in contact with the groove walls of the mounting groove 11. Among them, the magnetic induction intensity of the first magnetic strip portion 31 is higher than that of the second magnetic strip portion 32. One of the first magnetic strip portions 31 is used to simultaneously adsorb the two front and rear butted free ends 41 of the flexible printing plate 40. By arranging the magnetic strip portions 30 with different magnetic induction intensities, the adsorption force between the parts of the flexible printing plate 40 that are prone to displacement and the roller body 10 can be specifically improved.

[0048] In this embodiment, the equally spaced arc-shaped grooves 12 are used to increase the roughness of the bottom of the mounting groove 11 and the contact surface area of the bottom of the mounting groove 11, so that the adhesive layer 20 can be coated more evenly and firmly at the bottom of the mounting groove 11, improving the adhesion strength between the magnetic strip portion 30 and the mounting groove 11, and at the same time avoiding unstable adhesion at local positions of the magnetic strip portion 30; the first magnetic strip portion 31 with a higher magnetic induction intensity is used to simultaneously adsorb the two front and rear butted free ends 41 of the flexible printing plate 40, so that the two free ends 41 of the flexible printing plate 40 bent along the circumferential direction of the roller body 10 do not shift, ensuring the fitting degree of the flexible printing plate 40 on the roller body 10.

[0049] Preferably, the arc-shaped groove 12 is inclined downward, the groove wall is inclined, and the outer contour line of the groove top is semi-circular. After the glue is coated in the mounting groove 11 and the magnetic strip portion 30 is pressed into the mounting groove 11, the glue will flow along the inclined groove wall into the bottom of the arc-shaped groove 12, and a contact mode in which an adhesive layer 20 and the groove top of the arc-shaped groove 12 alternate with each other is formed at the bottom of the magnetic strip portion 30; it should be noted that in combination with Figure 4 , the thickness of the adhesive layer 20 can be flush with the groove top of the arc-shaped groove 12. This method can prevent the bottom of the magnetic strip portion 30 from contacting the adhesive layer 20 entirely, and a certain part of the magnetic strip portion 30 will directly contact the groove top of the arc-shaped groove 12; in combination with Figure 5, the thickness of the adhesive layer 20 can also exceed the top of the arc-shaped groove 12, but the exceeded distance is not greater than 0.5 mm. By the relatively thin exceeded thickness, the deformation size of the adhesive layer 20 above the top of the groove is limited. Because when using the flexible printing plate 40 to cut a relatively hard material, the acting force transmitted from the flexible printing plate 40 to the magnetic strip part 30 is very large. If in the traditional glue coating method, the adhesive layer 20 is subjected to a large extrusion force, and since only local parts of the flexible printing plate 40 are often provided with tool parts 42 with special shapes, the force on the flexible printing plate 40 is uneven, which will cause the thickness of the adhesive layer 20 to be thinner at the parts with large force, and the glue is extruded to the parts with smaller force, forming an adhesive layer 20 with uneven thickness. Therefore, in this embodiment, through two implementation methods, the first one is as Figure 4 shown. By directly contacting the top of the arc-shaped groove 12 with the bottom of the magnetic strip part 30, the supporting force of the magnetic strip part 30 is increased by using a hard material, sharing part of the force for the adhesive layer 20, avoiding the uneven deformation of the adhesive layer 20, thereby reducing the deformation degree of this magnetic roller and improving the reliability; the other one is as Figure 5 shown. A very thin adhesive layer 20 is still reserved at the top of the arc-shaped groove 12. The distance between two arc-shaped grooves 12 is less than the thickness of the permanent magnet 51 and the magnetic pole plate 52 in the magnetic strip part 30. The same permanent magnet 51 or magnetic pole plate 52 acts on the tops of at least two arc-shaped grooves 12. When the magnetic strip part 30 is subjected to uneven acting forces, the deformable space of the adhesive layer 20 is very small, and it is ensured that the entire bottom surface of the magnetic strip part 30 is in contact with the adhesive layer 20.

[0050] As an implementation method, in order to improve the adhesion ability of the adhesive layer 20 at the arc-shaped groove 12, the surface roughness range of the bottom surface of the installation groove 11 is Ra25~Ra50μm. The rough bottom surface of the groove is more conducive to coating and adhering the adhesive layer 20.

[0051] Preferably, when the surface roughness of the bottom surface of the installation groove 11 is Ra50μm, the adhesive layer 20 is coated on the arc-shaped groove 12, and the adhesive layer 20 exceeds the top of the arc-shaped groove 12 by 0.2 mm. An insulating layer with a thickness of 0.1 mm is also coated on the bottom of the magnetic strip part 30. The total thickness of the adhesive layer 20 and the insulating layer does not exceed 0.5 mm. Then the magnetic strip part 30 is pressed and combined on the arc-shaped groove 12. The magnetic roller prepared in this way is not easy to deform and has high stability.

[0052] In this embodiment, the magnetic stripe portion 30 includes a permanent magnet 51 and a magnetic pole plate 52. The permanent magnet 51 is made of a permanent magnetic material, and the magnetic pole plate 52 is made of a ferromagnetic material. The permanent magnet 51 and the magnetic pole plate 52 are arranged in an interlaced manner in the mounting groove 11. The side where the permanent magnet 51 and / or the magnetic pole plate 52 contacts the groove wall of the mounting groove 11 is provided with a first positioning mechanism, and the groove wall of the mounting groove 11 is provided with a second positioning mechanism engaged with the first positioning mechanism. Due to the strong force relationship between the flexible knife plate 40 and the magnetic stripe portion 30, when the flexible knife plate 40 cuts the hard material, as the roller body 10 rotates, the flexible knife plate 40 is pulled out of the hard material, and the flexible knife plate 40 may be pulled by the hard material and tend to separate from the roller body 10. At this time, the positioning relationship between the first positioning mechanism and the second positioning mechanism can strengthen the force between the permanent magnet 51, the magnetic pole plate 52 and the groove wall of the mounting groove 11. The first positioning mechanism and the second positioning mechanism may be in the form of a card point and a card slot, and the protruding card point is inserted into the concave card slot to achieve the positioning effect, which is also more conducive to controlling the thickness of the adhesive layer 20.

[0053] In addition, the permanent magnet 51 is provided with a third positioning mechanism 53 on the side in contact with the magnetic pole plate 52, and the side of the magnetic pole plate 52 is provided with a fourth positioning mechanism 54 which is clamped with the third positioning mechanism 53. The permanent magnet 51 and the magnetic pole plate 52 form a magnetic stripe portion 30 through the clamping of the third positioning mechanism 53 and the fourth positioning mechanism 54. The third positioning mechanism 53 and the fourth positioning mechanism 54 can be a structural form of a clamping point and a clamping groove, and the protruding clamping point is clamped into the recessed clamping groove to achieve a positioning effect. When the permanent magnet 51 and the magnetic pole plate 52 in the local area are subjected to a large force, the third positioning mechanism 53 and the fourth positioning mechanism 54 are used to effectively improve the integrity of the magnetic stripe portion 30 and avoid local depression or bulging.

[0054] In this embodiment, the permanent magnet 51 includes an upper permanent magnet portion and a lower permanent magnet portion. The length of the upper permanent magnet portion is greater than that of the lower permanent magnet portion. The permanent magnet 51 is in a T-shaped structure, wider at the top and narrower at the bottom. The upper permanent magnet portion is provided with a third positioning mechanism 53, and the lower permanent magnet portion is provided with a first positioning mechanism.

[0055] The magnetic pole plate 52 includes an upper magnetic conductive portion and a lower magnetic conductive portion. The length of the upper magnetic conductive portion is greater than that of the lower magnetic conductive portion. The magnetic pole plate 52 is in a T-shaped structure, wider at the top and narrower at the bottom. The upper magnetic conductive portion is provided with a fourth positioning mechanism 54, and the lower magnetic conductive portion is provided with a first positioning mechanism.

[0056] A second positioning mechanism is provided at the lower portion of the groove wall of the installation groove 11 .

[0057] The permanent magnet 51 and the magnetic pole plate 52 are positioned relative to each other through the upper structure, and then are positioned relative to the groove wall of the mounting groove 11 through the lower structure. The mounting groove 11 is correspondingly arranged in a stepped shape, wider at the top and narrower at the bottom, to match the structures of the permanent magnet 51 and the magnetic pole plate 52. Similarly, an arc-shaped groove 12 can also be formed on the step. On the two steps, the above two combination methods of the adhesive layer 20 and the arc-shaped groove 12 are respectively applied. That is, on the upper step, the adhesive layer 20 is flush with the top of the arc-shaped groove 12, and on the lower step, the adhesive layer 20 protrudes from the top of the arc-shaped groove 12, combining the advantages of the two methods.

[0058] As an implementation manner, along the circumferential direction, the same number of second magnetic strip parts 32 are arranged between every two first magnetic strip parts 31. For example, 12 mounting grooves 11 are evenly formed on the circumferential side wall of the roller body 10, including 3 first magnetic strip parts 31 and 9 second magnetic strip parts 32. There are 3 second magnetic strip parts 32 arranged between every 2 first magnetic strip parts 31, which is equivalent to evenly distributing the first magnetic strip parts 31 in the second magnetic strip parts 32 to form a circle. Preferably, the magnetic induction intensity of the first magnetic strip part 31 is four times that of the second magnetic strip part 32. Combining the quantity and layout of the first magnetic strip part 31 and the second magnetic strip part 32 can improve the adsorption capacity of the entire roller body 10 for the flexible printing plate 40. For example, the magnetic induction intensity of the first magnetic strip part 31 is four times that of the second magnetic strip part 32, and four second magnetic strip parts 32 are arranged between two first magnetic strip parts 31. The magnetic induction intensity of each first magnetic strip part 31 is added to the four second magnetic strip parts 32 adjacent to it on the left and right, which can reflect a better adsorption effect; moreover, the cutting tool part 42 on the flexible printing plate 40 is attached above the first magnetic strip part 31, increasing the adhesion force between this part and the roller body 10 during the cutting process.

[0059] Preferably, the first magnetic strip part 31 for adsorbing the free end 41 of the flexible printing plate 40 is also provided with an inwardly recessed positioning groove line 55. One side of the positioning groove line 55 is provided with a positioning pin hole 56. The left and right sides of the positioning groove line 55 are simultaneously abutted against the two free ends 41 of the flexible printing plate 40. When the flexible printing plate 40 needs to be attached to the roller, first abut one end of the flexible printing plate 40 against one side of this positioning groove line 55. After positioning, then slowly press the flexible printing plate 40 towards the roller body 10 along the circumferential direction of the roller body 10. Finally, abut the other end of the flexible printing plate 40 against the other side of this positioning groove line 55, and then insert a pin through the flexible printing plate 40 and insert it at the positioning pin hole 56. Using the pin hole 56 and the pin, further positioning of the flexible printing plate 40 is carried out. By setting the positioning groove line 55 and the pin hole 56 and the pin, the positioning and fastening of the flexible printing plate 40 are facilitated.

[0060] It should be noted that as an alternative solution, when the thickness and hardness of the die-cutting material are relatively large, pins can be used for more secure fastening. When the thickness and hardness of the die-cutting material are relatively small, pins may not be necessary.

[0061] In a second aspect, the present embodiment provides a processing method for producing the magnetic roller as described in the above embodiment, including the following steps:

[0062] Step S1: Rough-turn the roller body 10 in the blank steel.

[0063] Step S2: Uniformly mill a plurality of mounting grooves 11 along the circumferential side wall of the roller body 10, control the milling cutter to move forward in a paused manner at equal intervals, and form an arc-shaped groove 12 at the pause.

[0064] Step S3: Coat an adhesive layer 20 in the mounting groove 11.

[0065] Step S4: Attach the pre-assembled magnetic strip part 30 to the corresponding mounting groove 11, and apply a pressing force to the magnetic strip part 30 for shaping.

[0066] Step S5: Dry and cure the magnetic strip part 30.

[0067] Step S6: Rough-grind the common outer surface of the magnetic strip part 30 and the roller body 10.

[0068] Step S7: Finish-grind the common outer surface of the magnetic strip part 30 and the roller body 10.

[0069] It should be noted that during the process of milling the mounting groove 11, when the milling cutter pauses, change the cutting height so that the arc-shaped groove 12 forms a shape with a gradual change in height, presenting a certain slope. In the direction of the forward movement of the milling cutter, it presents a wavy trajectory, so that a plurality of equidistant arc-shaped grooves 12 are formed at the bottom of the mounting groove 11. After coating the adhesive layer 20 in the mounting groove 11, use a leveling tool such as a scraper to scrape the top surface of the adhesive layer 20 flat. Of course, the top surface of the adhesive layer 20 can be scraped to be flush with the top of the arc-shaped groove 12, or the top surface of the adhesive layer 20 can be controlled to exceed the top of the arc-shaped groove 12.

[0070] In addition, the above steps are only the core steps in the processing of the magnetic roller, and there are other auxiliary steps. For example, when rough-turning in the blank steel, directly rough-turn the roller body 10, the roller shoulder, and the shaft head, etc., and then perform heat treatment on the roller body 10 and the roller shoulder part; after finish-grinding the common outer surface of the magnetic strip part 30 and the roller body 10, it is also necessary to mill a positioning groove line 55 for installing the flexible printing plate, drill a positioning pin hole 56 for fixing the flexible printing plate, detect the overall dimensions, tolerances, and magnetic properties of the roller, perform an overall anti-corrosion treatment on the surface of the roller, and finally package and ship.

[0071] In step S4:

[0072] Since the magnetic strip portion 30 includes a permanent magnet 51 and a magnetic pole plate 52, the permanent magnet 51 and the magnetic pole plate 52 are pre-assembled into the magnetic strip portion 30 in advance by using the clamping relationship between the third positioning mechanism 53 and the fourth positioning mechanism 54;

[0073] First, the first magnetic strip portion 31 provided with a positioning groove line 55 is attached to the initial installation groove 11, and along the circumferential direction, 3 second magnetic strip portions 32 are sequentially placed in the corresponding installation grooves 11;

[0074] The second first magnetic strip portion 31 is placed in the next installation groove 11, and then 3 second magnetic strip portions 32 are sequentially placed in the corresponding installation grooves 11;

[0075] The third first magnetic strip portion 31 is placed in the next installation groove 11, and then 3 second magnetic strip portions 32 are sequentially placed in the corresponding installation grooves 11;

[0076] In the above manner, 3 first magnetic strip portions 31 and 9 second magnetic strip portions 32 are uniformly arranged in the installation grooves 11, and the first magnetic strip portions 31 are uniformly distributed in the second magnetic strip portions 32.

[0077] In step S7, the surface roughness range of the outer profile surface of the magnetic strip portion 30 and the roller body 10 after fine grinding is less than Ra1μm, preventing the flexible printing plate 40 from jumping due to the uneven installation plane during cutting.

[0078] Compared with the prior art, the above embodiment provides a magnetic roller and its processing method, which uses equidistant arc-shaped grooves 12 to improve the roughness of the bottom of the installation groove 11, so that the adhesive layer 20 can be more evenly and firmly coated at the bottom of the installation groove 11, improving the adhesion strength between the magnetic strip portion 30 and the installation groove 11; the first magnetic strip portion 31 with a higher magnetic induction intensity is used to simultaneously adsorb the two front and rear butt-free ends 41 of the flexible printing plate 40, and pin holes 56 and pins are used for insurance reinforcement, so that the two free ends 41 of the flexible printing plate 40 bent along the circumferential direction of the roller body 10 do not shift, ensuring the fitting degree of the flexible printing plate 40 on the roller body 10.

[0079] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0080] The above embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A magnetic roller for magnetically adsorbing a flexible printing plate, characterized in that, Comprising: A roller body, on which a plurality of mounting grooves are evenly formed in the circumferential side wall thereof, and a plurality of equidistant arc-shaped grooves are provided at the bottom of each mounting groove; the arc-shaped grooves are semi-circular in shape, extend along the axial direction of the roller body at the bottom of the mounting groove, and the distance between two adjacent arc-shaped grooves is equal; the arc-shaped grooves are inclined downward, their groove walls are inclined, and the outer contour line of the groove top is semi-circular; the arc-shaped grooves are configured to form arc-shaped grooves at the pausing positions at the bottom of the mounting groove by controlling the milling cutter to move forward in an equidistant interval and pausing manner. An adhesive layer, coated on the arc-shaped grooves; the thickness of the adhesive layer exceeds the groove top of the arc-shaped grooves. A magnetic strip part, including at least one first magnetic strip part and at least one second magnetic strip part, each first magnetic strip part or second magnetic strip part is attached to the corresponding mounting groove through the adhesive layer, the magnetic induction intensity of the first magnetic strip part is higher than that of the second magnetic strip part, and one of the first magnetic strip parts is used to simultaneously adsorb two front and rear butt-jointed free ends of the flexible printing plate. The surface roughness of the bottom of the mounting groove is Ra50μm, the adhesive layer is coated on the arc-shaped grooves, and the adhesive layer protrudes 0.2mm beyond the groove top of the arc-shaped grooves. A 0.1mm insulating layer is also coated on the bottom of the magnetic strip part. The total thickness of the adhesive layer and the insulating layer does not exceed 0.5mm, and then the magnetic strip part is pressed onto the arc-shaped grooves.

2. The magnetic roller according to claim 1, characterized in that, The magnetic strip part includes a permanent magnet and a magnetic pole plate, the permanent magnet and the magnetic pole plate are arranged in the mounting groove in an alternating manner, and a first positioning mechanism is provided on the side surface of the permanent magnet and / or the magnetic pole plate in contact with the groove wall of the mounting groove, and a second positioning mechanism for engaging with the first positioning mechanism is provided on the groove wall of the mounting groove.

3. The magnetic roller according to claim 2, characterized in that, The permanent magnet is provided with a third positioning mechanism on the side surface in contact with the magnetic pole plate, the side surface of the magnetic pole plate is provided with a fourth positioning mechanism for engaging with the third positioning mechanism, and the permanent magnet and the magnetic pole plate form the magnetic strip part through the engagement of the third positioning mechanism and the fourth positioning mechanism.

4. The magnetic roller according to claim 3, characterized in that, The permanent magnet includes an upper permanent magnet part and a lower permanent magnet part, the length of the upper permanent magnet part is greater than that of the lower permanent magnet part, the upper permanent magnet part is provided with the third positioning mechanism, and the lower permanent magnet part is provided with the first positioning mechanism. The magnetic pole plate includes an upper magnetic conduction part and a lower magnetic conduction part, the length of the upper magnetic conduction part is greater than that of the lower magnetic conduction part, the upper magnetic conduction part is provided with the fourth positioning mechanism, and the lower magnetic conduction part is provided with the first positioning mechanism. The second positioning mechanism is provided at the lower part of the groove wall of the mounting groove.

5. The magnetic roller according to any one of claims 1 to 4, characterized in that, Along the circumferential direction, the same number of the second magnetic strip parts are arranged between every two first magnetic strip parts.

6. The magnetic roller according to claim 5, characterized in that, The first magnetic strip part for adsorbing the free end of the flexible printing plate is also provided with an inwardly recessed positioning groove line, one side of the positioning groove line is provided with a positioning pin hole, and the left and right sides of the positioning groove line are simultaneously in contact with the two free ends of the flexible printing plate.

7. A processing method for producing the magnetic roller according to any one of claims 1 to 6, characterized in that, Including the following steps: Step S1: Rough-turn the roller body from rough steel. Step S2: Uniformly mill a number of mounting grooves along the circumferential side wall of the roller body, control the milling cutter to move forward in a pause pattern at equal intervals, and form an arc-shaped groove at the pause position; Step S3: Coat an adhesive layer into the mounting grooves; Step S4: Attach the pre-assembled magnetic strip part to the corresponding mounting groove, and apply a pressing force to the magnetic strip part for shaping; Step S5: Dry and cure the magnetic strip part; Step S6: Rough grind the common outer surface of the magnetic strip part and the roller body; Step S7: Finish grind the common outer surface of the magnetic strip part and the roller body.

8. The processing method according to claim 7, characterized in that, In Step S4: First, attach the first magnetic strip part provided with a positioning groove line to the initial mounting groove, and along the circumferential direction, place N second magnetic strip parts in the corresponding mounting grooves in sequence; Place another first magnetic strip part in the next mounting groove, and then place N second magnetic strip parts in the corresponding mounting grooves in sequence; And so on until all the mounting grooves are attached with magnetic strip parts.

9. The processing method according to claim 8, characterized in that, In Step S7, the surface roughness range of the outer surface of the magnetic strip part and the roller body after finish grinding is less than Ra1μm.

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