Automatic cleaning device for doctor blade of printing machine

Abstract

The invention relates to the technical field of doctor blades, in particular to an automatic cleaning device for a doctor blade of a printing machine. When two cleaning blocks are continuously close to each other, a chamfer extrudes a cleaning piece, the angle between the cleaning piece and a connecting plate is reduced, and the cleaning piece moves to the chamfer; in the process that the cleaning piece moves to the chamfer, the cleaning piece cleans the ink between the two cleaning blocks, and then the situation that ink residues are generated between the two cleaning blocks is avoided; and when the two cleaning blocks are far away from each other, the cleaning pieces are separated from the chamfers, the angle between the cleaning pieces and the connecting plate is reset to 60 degrees again, the effect that when the two cleaning blocks are far away from each other, the cleaning pieces conduct scraping cleaning on the surface of the blade is achieved, then comprehensive cleaning on the blade is achieved, and the use efficiency of the doctor blade is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of doctor blade, in particular to a printing machine doctor blade automatic cleaning device. BACKGROUND

[0002] Doctor blade, a thin sheet of metal and non-metal used to scrape off the excess ink on the surface of the cylinder on the printing machine; in each printing process, removing the ink in the non-pattern area is a key point; in offset printing, this control is a complex process of ink transfer, including ink, plate and paper.

[0003] In gravure printing, it is a mechanical operation, relatively simple, but it has its own unique nature; the ink doctor requires wear resistance and high efficiency to ensure high quality of printing, and it must be suitable for the needs of modern gravure printing durability and high speed.

[0004] However, when the doctor blade is scraping the ink, the ink itself is composed of resin, pigment, filler, additive and solvent, etc., and the resin itself has viscosity. When the doctor blade scrapes the ink for a long time, part of the ink will be bonded to the blade of the doctor blade, and the residual ink on the doctor blade will cause unexpected ink dots or uneven ink distribution on the printed product, thereby affecting the quality and appearance of the printed product.

[0005] In view of the above, in order to solve the technical problems proposed in this paper, the present application provides a printing machine doctor blade automatic cleaning device. SUMMARY

[0006] The present application provides a printing machine doctor blade automatic cleaning device; it includes a printing roller and a doctor blade, the doctor blade includes a blade and a holder, the holder is arranged on the printing machine, the holder is composed of two clamps, the blade is fixed between the two clamps on the holder, and the end of the blade away from the holder contacts the printing roller; the holder further comprises: The number of the strip-shaped blocks is two, and the gap between the two strip-shaped blocks forms an electric sliding rail; The number of the slide rods is two, and the slide rods are slidingly connected between the two strip-shaped blocks to realize sliding of the slide rods between the two strip-shaped blocks; The cleaning blocks are fixedly connected to the ends of the slide rods away from the strip-shaped blocks, and the two cleaning blocks are slidingly connected with the lower surface of the blade on the doctor blade; The cleaning assembly is arranged on the cleaning block, and the cleaning assembly realizes cleaning of the position between the two cleaning blocks.

[0007] As a preferred scheme of the present application, the cleaning assembly comprises: The side of one of the cleaning blocks is provided with a chamfer, and the chamfer of the cleaning block is located at one end of the two cleaning blocks close to each other; the side of the other cleaning block is provided with a connecting plate, and the connecting plate is located at one end of the two cleaning blocks close to each other; the end of the connecting plate close to the chamfer is hinged with a cleaning piece through a rotating shaft provided with a torsion spring, and the gap between the cleaning piece and the connecting plate in the initial state is 60°.

[0008] As a preferred scheme of the present application, the cleaning assembly further comprises; The side of one of the cleaning blocks is provided with a chamfer, and the chamfer of the cleaning block is located at one end of the two cleaning blocks close to each other; the side of the other cleaning block is provided with a connecting plate, and the connecting plate is located at one end of the two cleaning blocks close to each other; the end of the connecting plate close to the chamfer is of an elastic material, and the end of the connecting plate close to the chamfer is of an arc shape.

[0009] As a preferred scheme of the present application, the two ends of the strip-shaped block are provided with extrusion plates, the part between the two strip-shaped blocks is of an inclined surface, the end of the extrusion plate close to the upper blade of the doctor blade penetrates through the strip-shaped block and is in sliding connection with the strip-shaped block; the end of the extrusion plate close to the blade is provided with a cleaning strip, and the cleaning strip is in sliding connection with the blade.

[0010] As a preferred scheme of the present application, the two ends of the cleaning strip are provided with supports, and a limiting column is arranged between the two supports, and the blade on the doctor blade is located between the cleaning strip and the limiting column.

[0011] As a preferred scheme of the present application, the support is provided in two sections, and the angle between the two ends of the support is adjustable, and the two supports are connected through locking bolts.

[0012] As a preferred scheme of the present application, the middle part of each sliding rod is provided with a sponge block, and the sponge block is in contact with the end of the cleaning strip away from the blade.

[0013] As a preferred scheme of the present application, the sliding rod is of an elastic material, and the sliding rod is in sliding connection with the cleaning block.

[0014] The beneficial effects of the present application are as follows: As the two cleaning blocks approach each other, the chamfer presses against the cleaning blade, reducing the angle between the cleaning blade and the connecting plate, and the cleaning blade moves onto the chamfer. During this movement, the cleaning blade cleans the ink between the two cleaning blocks, preventing ink residue from forming between them. When the two cleaning blocks move away from each other, the cleaning blade detaches from the chamfer, and the angle between the cleaning blade and the connecting plate returns to 60°. This allows the cleaning blade to scrape and clean the blade surface as the two cleaning blocks move away from each other, achieving comprehensive cleaning of the blade and improving the efficiency of the doctor blade. Attached Figure Description

[0015] Figure 1 This is a perspective view of the printing roller and the knife holder in this invention; Figure 2 This is a front view of the tool holder and the blade in this invention; Figure 3 This is a bottom view of the blade and blade holder in this invention; Figure 4 This is a partial cross-sectional view of the strip block in this invention; Figure 5 This is a structural view of the slide bar and cleaning block in this invention; Figure 6 This is a structural view of the extrusion plate and the support in this invention; Figure 7 This is a structural view of the slide bar and blade in this invention; Figure 8 This is in Embodiment 1 of the present invention Figure 7 A magnified view of the cleaning component at point A in the middle; Figure 9 This is in Embodiment 2 of the present invention Figure 7 A magnified view of the cleanup component at point B in the middle.

[0016] In the diagram: printing roller 1, doctor blade 2, blade 21, blade holder 22, strip block 221, slide bar 222, cleaning block 223, chamfer 224, connecting plate 225, cleaning plate 226, extrusion plate 227, cleaning strip 23, bracket 24, limiting post 25, sponge block 228. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] A doctor blade is a thin sheet of metal or non-metal used on a printing press to scrape away excess ink from the surface of the cylinder. Removing ink from unpatterned areas is a crucial step in each printing process. In offset printing, this control involves a complex process of ink transfer, including ink, plate, and paper. In the gravure printing, it is a mechanical operation, relatively simple, but it has its own unique nature; the ink doctor requires must have wear resistance and high efficiency, to ensure the high quality of printing quality, and it must be suitable for the needs of modern gravure printing and high speed and durability; But when the doctor blade in the process of scraping the ink, due to the ink itself material has resin, pigment, filler, additives and solvents, etc., the resin itself has viscosity, when the doctor blade long time to remove the ink, part of the ink will be bonded to the doctor blade blade, and the ink residue on the doctor blade will cause the appearance of unexpected ink dots or uneven ink distribution on the printed matter, thereby affecting the quality and appearance of the printed matter.

[0019] Example one: As Figures 1 to 8 shown; the doctor blade 2 of the printing machine automatic cleaning device; including the printing roller 1 and the doctor blade 2, the doctor blade 2 includes the blade 21 and the holder 22, the holder 22 is arranged on the printing machine, the holder 22 is composed of two clamping plates, the blade 21 is fixed between the two clamping plates on the holder 22, the end of the blade 21 away from the holder 22 contacts the printing roller 1; the holder 22 further comprises: strip block 221, the number of strip block 221 is two, and the gap between the two strip block 221 forms the electric sliding rail; slide rod 222, the number of slide rod 222 is two, and the slide rod 222 is slidingly connected between the two strip block 221, so that the slide rod 222 slides between the two strip block 221; cleaning block 223, the cleaning block 223 is fixedly connected to the end of the slide rod 222 away from the strip block 221, and the two cleaning blocks 223 are slidingly connected with the lower surface of the blade 21 on the doctor blade 2; cleaning assembly, the cleaning assembly is arranged on the cleaning block 223, and the cleaning assembly realizes cleaning of the position between the two cleaning blocks 223; the cleaning assembly comprises: one of the cleaning block 223 is provided with chamfer 224 on the side surface, and the position of the chamfer 224 of the cleaning block 223 is located at the end of the two cleaning blocks 223 close to each other; the side surface of the other cleaning block 223 is provided with connecting plate 225, and the connecting plate 225 is located at the end of the two cleaning blocks 223 close to each other; the end of the connecting plate 225 close to the chamfer 224 is hinged with the cleaning blade 226 through the shaft provided with the torsional spring, and the gap between the cleaning blade 226 and the connecting plate 225 in the initial state is 60°.

[0020] The specific working process is as follows: When the doctor blade 2 is installed, first, the blade 21 is installed on the holder 22, then the holder 22 is installed on the printing machine by the personnel, after the holder 22 is installed on the printing machine, the blade 21 on the doctor blade 2 contacts the outer side of the printing roller 1 inside the printing machine, and the printing roller 1 rotates counterclockwise, during the rotation of the printing roller 1, the blade 21 scrapes the excess ink on the printing roller 1, achieving the purpose of scraping the excess ink on the printing roller 1; When the blade 21 scrapes the excess ink on the printing roller 1, the slide rod 222 on the holder 22 slides between the two strip blocks 221, because the two strip blocks 221 form an electric sliding rail, and the slide rod 222 is connected between the two strip blocks 221 by sliding, the slide rod 222 slides between the two strip blocks 221 in the form of motor drive (the same as the principle of the existing electric sliding rail); By setting the cleaning block 223 at the end of the slide rod 222 away from the strip block 221, when the slide rod 222 slides between the two strip blocks 221, the number of slide rods 222 is two, and the sliding direction of the two slide rods 222 is that first, the two slide rods 222 slide from the middle of the strip block 221 to both ends, and the two slide rods 222 drive the cleaning block 223 to slide from the middle of the blade 21 to both ends; after the slide rod 222 moves to the middle of both ends of the two strip blocks 221, the two slide rods 222 slide from both ends of the two strip blocks 221 to the middle, and the two slide rods 222 approach each other, the slide rod 222 drives the two cleaning blocks 223 to approach each other on the blade 21, so as to realize the cleaning of the cleaning block 223 on the blade 21, avoid the residual ink on the blade 21, and cause the problem of unexpected ink dots or uneven ink distribution on the printed matter; Furthermore, by setting a cleaning component between two cleaning blocks 223, a chamfer 224 is first formed on one of the two cleaning blocks 223, and the chamfer 224 is located between the two cleaning blocks 223. A connecting plate 225 is set on the other cleaning block 223, and the connecting plate 225 is located between the two cleaning blocks 223. A cleaning piece 226 is set on the end of the connecting plate 225 near the chamfer 224. The cleaning piece 226 is hinged to the connecting plate 225 by a torsion spring. Based on the above, when the two cleaning blocks 223 approach each other, the chamfer 224 on one of the cleaning blocks 223 will approach each other until the chamfer 224 contacts the cleaning piece 226 hinged on the connecting plate 225. The two cleaning blocks 223 continue to approach each other. In the initial state, the cleaning piece 226... The angle between the cleaning block 226 and the connecting plate 225 is 60°. When the two cleaning blocks 223 continue to approach each other, the chamfer 224 squeezes the cleaning plate 226, and the angle between the cleaning plate 226 and the connecting plate 225 becomes smaller. The cleaning plate 226 moves onto the chamfer 224. During the process of the cleaning plate 226 moving onto the chamfer 224, the cleaning plate 226 cleans the ink between the two cleaning blocks 223, thereby avoiding ink residue between the two cleaning blocks 223. When the two cleaning blocks 223 move away from each other, the cleaning plate 226 disengages from the chamfer 224, and the angle between the cleaning plate 226 and the connecting plate 225 returns to 60°. This achieves that when the two cleaning blocks 223 move away from each other, the cleaning plate 226 scrapes and cleans the surface of the blade 21, thereby achieving comprehensive cleaning of the blade 21 and improving the efficiency of the doctor blade 2.

[0021] Example 2: like Figures 1 to 9 As shown; the difference between Embodiment 2 and Embodiment 1 is that the cleaning component in Embodiment 2 is a replacement for the cleaning component in Embodiment 1, and can exist as a parallel embodiment; The cleaning component also includes; One of the cleaning blocks 223 has a chamfer 224 on its side, and the chamfer 224 is located at the end of the two cleaning blocks 223 that are close to each other; the other cleaning block 223 has a connecting plate 225 on its side, and the connecting plate 225 is located at the end of the two cleaning blocks 223 that are close to each other; the end of the connecting plate 225 near the chamfer 224 is made of elastic material, and the end of the connecting plate 225 near the chamfer 224 is arc-shaped.

[0022] The specific workflow is as follows: Based on the above embodiment 1, when the two cleaning blocks 223 approach each other, the connecting plate 225 and the chamfer 224 on the cleaning block 223 approach each other until the arc of the end of the connecting plate 225 near the chamfer 224 contacts the chamfer 224. At this time, the two cleaning blocks 223 continue to approach each other. Since the end of the connecting plate 225 near the chamfer 224 is made of elastic material, the arc of the end of the connecting plate 225 near the chamfer 224 undergoes elastic deformation. The end of the connecting plate 225 near the chamfer 224 slides on the chamfer 224. Thus, when the two cleaning blocks 223 approach each other, the arc of the end of the connecting plate 225 near the chamfer 224 cleans the gap between the two cleaning blocks 223, thereby avoiding ink residue between the two cleaning blocks 223.

[0023] Example 3: like Figures 1 to 6 As shown; both ends of the strip block 221 are provided with extrusion plates 227. The portion of the extrusion plate 227 between the two strip blocks 221 is inclined. The end of the extrusion plate 227 near the blade 21 on the doctor blade 2 passes through the strip block 221 and is slidably connected to the strip block 221; a cleaning strip 23 is provided at the end of the extrusion plate 227 near the blade 21, and the cleaning strip 23 is slidably connected to the blade 21; The cleaning strip 23 is provided with brackets 24 at both ends, and a limiting post 25 is provided between the two brackets 24, and the blade 21 on the doctor blade 2 is located between the cleaning strip 23 and the limiting post 25. The bracket 24 is configured in two sections, and the angle between the two ends of the bracket 24 is adjustable. The two brackets 24 are connected by locking bolts.

[0024] The specific workflow is as follows: By providing extrusion plates 227 at both ends of the strip block 221, with the portion of the extrusion plate 227 located between the two strip blocks 221 having an inclined surface, and the end of the extrusion plate 227 near the blade 21 passing through the strip block 221 and being slidably connected to the strip block 221, and by providing an elastic band between the extrusion plate 227 and the strip block 221, the extrusion plate 227 can reciprocate; and by providing a cleaning strip 23 at the end of the extrusion plate 227 near the blade 21, and the cleaning strip 23 being slidably connected to the blade 21; When the two sliding rods 222 slide between the two blocks 221, especially when the two sliding rods 222 are away from each other, the two sliding rods 222 move to the two ends of the block 221, and when the sliding rods 222 move to the two ends of the block 221, the sliding rods 222 will extrude the inclined surface of the extrusion plate 227 located between the two blocks 221. After the extrusion plate 227 is extruded, the extrusion plate 227 moves away from the block 221, and in the process, the extrusion plate 227 drives the cleaning strip 23 to clean the blade 21, realizing that after the cleaning block 223 cleans the blade 21 transversely, the cleaning strip 23 cleans the blade 21 longitudinally, thereby improving the cleaning efficiency of the doctor blade 2, and thereby improving the use efficiency of the doctor blade 2; And by setting the bracket 24 at both ends of the cleaning strip 23, and setting the limiting column 25 between the two brackets 24, the blade 21 on the doctor blade 2 is located between the limiting column 25 and the cleaning strip 23; When the doctor blade 2 is used, the blade 21 is located between the limiting column 25 and the cleaning strip 23, and at this time, due to the limiting column 25 and the cleaning strip 23 being arranged on the blade holder 22, the blade holder 22 being fixed on the printing machine, the limiting column 25 can limit the blade 21 to a certain extent, avoiding the impact of the ink on the printing roller 1 on the blade 21 when the printing roller 1 rotates, causing a gap between the blade 21 and the printing roller 1, thereby avoiding the problem of defective products after printing; And by setting the bracket 24 at both ends, and adjusting the angle between the two sections of the bracket 24, and connecting the two sections of the bracket 24 through the locking bolt, when the worker installs the blade 21 on the blade holder 22, the worker can judge whether the limiting column 25 and the blade 21 are tightly fitted, whether the limiting column 25 and the blade 21 are in a normal state during installation and use, and adjust the gap between the bracket 24 and the cleaning strip 23 by rotating the bracket 24, thereby realizing the application of blades 21 of different thicknesses; thereby improving the practicality.

[0025] Embodiment four: As shown in Figures 2 to 5 Each of the sliding rods 222 is provided with a sponge block 228, and the sponge block 228 is in contact with the end of the cleaning strip 23 away from the blade 21; The sliding rod 222 is made of elastic material, and the sliding rod 222 is connected with the cleaning block 223.

[0026] The specific working process is as follows: By setting the sponge block 228 in the middle of each slide rod 222, and the sponge block 228 is in surface contact with the cleaning strip 23; on the basis of embodiment one, when the two slide rods 222 move away from each other and move close to each other, the two slide rods 222 will move synchronously with the sponge block 228, in this process, the sponge block 228 moves on the surface of the cleaning strip 23, thereby realizing the cleaning of the surface of the cleaning strip 23, and improving the cleaning efficiency of the cleaning strip 23; And by realizing that the slide rod 222 is made of elastic material, such as elastic plastic sheet, and the slide rod 222 and the cleaning block 223 are in sliding connection, by making the slide rod 222 be elastic material, when the slide rod 222 is in motion, the slide rod 222 is elastically deformed in the direction of the blade 21, thereby realizing that the slide rod 222 drives the cleaning block 223 to closely adhere to the blade 21, realizing that the cleaning effect of the cleaning block 223 on the blade 21 is better, and by the sliding connection between the slide rod 222 and the cleaning block 223, realizing that the cleaning block 223 and the slide rod 222 can adapt to the distance between the blade 21 and the printing roller 1 for adjustment, thereby improving the applicability of the cleaning block 223 to different blades 21.

Claims

1. An automatic cleaning device for a printing press doctor blade; comprising a printing roller (1) and a doctor blade (2), the doctor blade (2) comprising a blade (21) and a blade holder (22), the blade holder (22) being mounted on a printing press, the blade holder (22) being composed of two clamping plates, the blade (21) being fixed between the two clamping plates on the blade holder (22), and the end of the blade (21) away from the blade holder (22) contacting the printing roller (1); characterized in that, The tool holder (22) also includes: The strip block (221) has two components, and there is a gap between the two strip blocks (221), which forms an electric slide rail; Slide rod (222), the number of slide rods (222) is two, and the slide rod (222) is slidably connected between two strip blocks (221) to realize that the slide rod (222) can slide between the two strip blocks (221); Cleaning block (223), the cleaning block (223) is fixedly connected to one end of the slide bar (222) away from the strip block (221), and the two cleaning blocks (223) are slidably connected to the lower surface of the blade (21) on the doctor blade (2); A cleaning component is disposed on the cleaning block (223) and performs cleaning of the position between the two cleaning blocks (223).

2. The automatic cleaning device for the doctor blade of a printing press as described in claim 1, characterized in that: The cleaning component includes; One of the cleaning blocks (223) has a chamfer (224) on its side, and the chamfer (224) is located at the end of the two cleaning blocks (223) that are close to each other; the other cleaning block (223) has a connecting plate (225) on its side, and the connecting plate (225) is located at the end of the two cleaning blocks (223) that are close to each other; the end of the connecting plate (225) near the chamfer (224) is hinged to a cleaning piece (226) through a pivot fitted with a torsion spring. In the initial state, the gap between the cleaning piece (226) and the connecting plate (225) is 60°.

3. The automatic cleaning device for the doctor blade of a printing press as described in claim 1, characterized in that: The cleaning component also includes; One of the cleaning blocks (223) has a chamfer (224) on its side, and the chamfer (224) is located at the end of the two cleaning blocks (223) that are close to each other; the other cleaning block (223) has a connecting plate (225) on its side, and the connecting plate (225) is located at the end of the two cleaning blocks (223) that are close to each other; the end of the connecting plate (225) near the chamfer (224) is made of elastic material, and the end of the connecting plate (225) near the chamfer (224) is arc-shaped.

4. The automatic cleaning device for the doctor blade of a printing press as described in claim 1, characterized in that: Both ends of the strip block (221) are provided with extrusion plates (227). The part of the extrusion plate (227) between the two strip blocks (221) is inclined. The end of the extrusion plate (227) near the blade (21) on the doctor blade (2) passes through the strip block (221) and is slidably connected to the strip block (221). The end of the extrusion plate (227) near the blade (21) is provided with a cleaning strip (23), and the cleaning strip (23) is slidably connected to the blade (21).

5. The automatic cleaning device for the doctor blade of a printing press as described in claim 4, characterized in that: The cleaning strip (23) is provided with brackets (24) at both ends, and a limiting post (25) is provided between the two brackets (24), and the blade (21) on the doctor blade (2) is located between the cleaning strip (23) and the limiting post (25).

6. The automatic cleaning device for the doctor blade of a printing press as described in claim 5, characterized in that: The bracket (24) is set in two sections, and the angle between the two ends of the bracket (24) is adjustable. The two brackets (24) are connected by locking bolts.

7. The automatic cleaning device for the doctor blade of a printing press as described in claim 1, characterized in that: Each of the slide bars (222) has a sponge block (228) in the middle, and the sponge block (228) contacts the end of the cleaning strip (23) away from the blade (21).

8. The automatic cleaning device for the doctor blade of a printing press as described in claim 7, characterized in that: The slide bar (222) is made of elastic material, and there is a sliding connection between the slide bar (222) and the cleaning block (223).

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