Method of sharpening a printing press plastic squeegee

Abstract

The application relates to the technical field of printing machines, in particular to a printing machine plastic scraper polishing method; through the arrangement of a first screw rod guide rail assembly, a first screw nut sliding block, a second screw rod guide rail assembly, a second screw nut sliding block, a third screw rod guide rail assembly, a third screw nut sliding block, a fourth screw nut sliding block, a first cutter holder, a second cutter holder, a first ink scraping knife, a second ink scraping knife, a first scraper polishing mechanism and a second scraper polishing mechanism, one of the ink scraping knives is moved to abut against the surface of a printing roller for an ink scraping process, and the other ink scraping knife is moved to the area of the corresponding scraper polishing mechanism for polishing; the two ink scraping knives are alternately used and polished, the interruption time for replacing the ink scraping knife is effectively reduced, and the production efficiency is improved; after polishing, the ink scraping knife can be repeatedly used for multiple times, and the worn ink scraping knife does not need to be directly discarded, the utilization rate of the ink scraping knife is improved, and the production cost is saved.

Description

Technical Field

[0001] This invention relates to the field of printing press technology, and more particularly to a method for polishing plastic doctor blades in printing presses. Background Technology

[0002] The printing press structure includes an ink trough, a printing roller, and an impression roller. The lower part of the printing roller is immersed in the ink trough, and the impression roller presses against the upper part of the printing roller. Guided by the joint rotation of the printing roller and the impression roller, the film travels through the gap between the impression roller and the printing roller. During the travel process, the ink adhering to the printing roller is transferred to the film. Since the ink adhering to the printing roller may not be uniform, a doctor blade is usually designed into the printing press structure. The blade of the doctor blade is close to the circumference of the printing roller, so that the excess ink is blocked and scraped off by the doctor blade, ensuring the uniformity of printing.

[0003] The doctor blade is made of plastic and is held in place on the blade holder as a consumable. When the doctor blade rubs against the ink on the printing roller surface for extended periods, it is prone to wear, affecting the doctoring effect. Therefore, to improve production efficiency, the current practice is to periodically disassemble and replace the doctor blade with a new one. However, replacing the doctor blade still takes a considerable amount of time, resulting in longer printing intervals; moreover, the low utilization rate of the doctor blade increases the production cost of film printing. Summary of the Invention

[0004] The technical problem to be solved by this invention is to improve the grinding method of plastic doctor blades in printing presses, increase the utilization rate of doctor blades, and improve printing production efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A method for polishing plastic doctor blades in a printing press, based on a plastic doctor blade polishing device for a printing press, the plastic doctor blade polishing device for a printing press comprising:

[0007] frame;

[0008] Ink tank, which is connected to the frame;

[0009] A printing roller, the printing roller having an axial direction in the X direction, the printing roller being rotatably connected to the frame, and the lower part of the printing roller being immersed in an ink trough;

[0010] An impression roller, the impression roller having a circumferential direction of X, the impression roller being rotatably connected to the frame, and the lower part of the impression roller pressing against the upper part of the printing roller;

[0011] The first lead screw guide rail assembly is connected to the frame in the vertical direction;

[0012] The first lead screw nut slider is slidably connected to the first lead screw guide rail assembly;

[0013] The second lead screw guide assembly is connected to the frame in the vertical direction. The second lead screw guide assembly and the first lead screw guide assembly are symmetrically distributed on the X-direction side and the X-direction reverse side of the printing roller, respectively.

[0014] The second lead screw nut slider is slidably connected to the second lead screw guide rail assembly;

[0015] The third lead screw guide rail assembly is connected axially in the X direction between the first lead screw nut slider and the second lead screw nut slider;

[0016] The third lead screw nut slider is slidably connected to the third lead screw guide rail assembly;

[0017] The fourth lead screw slider is slidably connected to the third lead screw guide rail assembly;

[0018] The first tool holder is connected to the third nut slider;

[0019] The second tool holder is connected to the fourth nut slider;

[0020] The first doctor blade is detachably connected to the first blade holder;

[0021] The second doctor blade is detachably connected to the second blade holder, and the first doctor blade is located on the X-direction side of the second doctor blade;

[0022] The first scraper polishing mechanism is located on the X-direction side of the printing roller;

[0023] The second scraper polishing mechanism is located on the X-direction reverse side of the printing roller;

[0024] The polishing method includes the following steps:

[0025] The control of the third lead screw guide assembly drives the third lead screw slider and the fourth lead screw slider to move, so that the second doctor blade is located on the Y-direction side of the printing roller;

[0026] The first lead screw guide assembly and the second lead screw guide assembly are controlled to move synchronously, which drives the first lead screw nut slider, the second lead screw nut slider and the third lead screw guide assembly to move in the vertical direction, so that the second doctor blade is in contact with the surface of the printing roller; at this time, the first doctor blade is located in the grinding area of ​​the first doctor blade grinding mechanism.

[0027] Control the first doctor blade polishing mechanism to polish the first doctor blade;

[0028] After a period of time, the control of the third lead screw guide assembly drives the third lead screw slider and the fourth lead screw slider to move, so that the first doctor blade is located on the Y-direction side of the printing roller;

[0029] The first lead screw guide assembly and the second lead screw guide assembly are controlled to move synchronously, which drives the first lead screw nut slider, the second lead screw nut slider and the third lead screw guide assembly to move in the vertical direction, and the first doctor blade just contacts the surface of the printing roller; at this time, the second doctor blade is located in the grinding area of ​​the second doctor blade grinding mechanism.

[0030] The second doctor blade polishing mechanism is controlled to polish the first doctor blade.

[0031] Furthermore, in the above-mentioned method for polishing plastic doctor blades in printing presses, the first doctor blade polishing mechanism includes:

[0032] A first lifting seat is movably connected to the frame;

[0033] A first lifting drive component is connected between the frame and the first lifting seat, and is used to drive the first lifting seat to move;

[0034] The fourth lead screw guide rail assembly is connected to the first lifting seat along the X direction;

[0035] The fifth lead screw slider is slidably connected to the fourth lead screw guide rail assembly;

[0036] The first grinding roller is rotatably connected to the fifth nut slider. The axial direction of the first grinding roller is Y. The circumferential surface of the first grinding roller is provided with a first annular groove that matches the shape of the first doctor blade. The first annular groove is provided with a grinding sand layer.

[0037] A first drive motor is connected to the first grinding roller via a transmission, and is used to drive the first grinding roller to rotate;

[0038] In the aforementioned polishing method, controlling the first doctor blade polishing mechanism to polish the first doctor blade specifically involves: controlling the first lifting drive component to move the first lifting seat so that the first annular groove of the first polishing roller contacts the cutting edge of the first doctor blade; controlling the fourth lead screw guide assembly to move the fifth lead screw slider back and forth along the X direction; and controlling the first drive motor to rotate the first polishing roller so that the cutting edge of the first doctor blade is polished during the back and forth movement of the first polishing roller.

[0039] Furthermore, in the above-mentioned method for grinding plastic scrapers in printing presses, the first lifting drive component includes one or more first telescopic cylinders arranged in a vertical direction, wherein the first telescopic cylinder is a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0040] Furthermore, in the above-mentioned method for polishing plastic doctor blades in printing presses, the second doctor blade polishing mechanism includes:

[0041] The second lifting seat is movably connected to the frame;

[0042] The second lifting drive component is connected between the frame and the second lifting seat, and is used to drive the second lifting seat to move;

[0043] The fifth lead screw guide rail assembly is connected to the second lifting seat along the X direction;

[0044] The sixth lead screw slider is slidably connected to the fifth lead screw guide rail assembly;

[0045] The second grinding roller is rotatably connected to the sixth nut slider. The axial direction of the second grinding roller is Y. The circumferential surface of the second grinding roller is provided with a second annular groove that matches the shape of the second doctor blade. The second annular groove is provided with a grinding sand layer.

[0046] The second drive motor is connected to the second grinding roller via a transmission, and is used to drive the second grinding roller to rotate;

[0047] In the aforementioned polishing method, controlling the second doctor blade polishing mechanism to polish the second doctor blade specifically involves: controlling the second lifting drive component to move the second lifting seat so that the second annular groove of the second polishing roller contacts the cutting edge of the second doctor blade; controlling the fifth lead screw guide assembly to move the sixth lead screw nut slider back and forth along the X direction; and controlling the second drive motor to rotate the second polishing roller so that the cutting edge of the second doctor blade is polished during the back and forth movement of the second polishing roller.

[0048] Furthermore, in the above-mentioned method for grinding plastic scrapers in printing presses, the second lifting drive component includes one or more vertically arranged second telescopic cylinders, which are pneumatic cylinders, hydraulic cylinders, or electric cylinders.

[0049] Furthermore, in the above-mentioned method for grinding plastic doctor blades in printing presses, the lower part of the first blade holder is provided with a first blade groove for fixing the first doctor blade; the first doctor blade is fixed in the first blade groove by bolts.

[0050] Furthermore, in the above-mentioned method for grinding plastic doctor blades in printing presses, the lower part of the second blade holder is provided with a second blade groove for fixing the second doctor blade; the second doctor blade is fixed in the second blade groove by bolts.

[0051] The beneficial effects of this invention are as follows: By setting up a first lead screw guide assembly, a first lead screw nut slider, a second lead screw guide assembly, a second lead screw nut slider, a third lead screw guide assembly, a third lead screw nut slider, a fourth lead screw nut slider, a first knife holder, a second knife holder, a first doctor blade, a second doctor blade, a first doctor blade grinding mechanism, and a second doctor blade grinding mechanism, one doctor blade moves to the printing roller surface to scrape ink while the other doctor blade moves to the corresponding doctor blade grinding mechanism area for grinding. The two doctor blades are used alternately and ground alternately, effectively reducing the interruption time of replacing doctor blades and improving production efficiency. Since the doctor blades can be reused multiple times after grinding, they no longer need to be discarded directly after wear, improving the utilization rate of doctor blades and saving production costs. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the structure of a printing press plastic scraper grinding device involved in a specific embodiment of the present invention;

[0053] Figure 2 for Figure 1 Enlarged view of part A;

[0054] Figure 3 for Figure 1 Enlarged view of part B;

[0055] Figure 4 for Figure 1 Enlarged view of part C;

[0056] Label Explanation:

[0057] 1. Rack;

[0058] 2. Ink trough;

[0059] 3. Printing roller;

[0060] 4. Impression roller;

[0061] 5. First lead screw guide rail assembly;

[0062] 6. First nut slider;

[0063] 7. Second lead screw guide rail assembly;

[0064] 8. Second nut slider;

[0065] 9. Third lead screw guide rail assembly;

[0066] 10. Third nut slider;

[0067] 11. Fourth nut slider;

[0068] 12. First knife holder;

[0069] 13. Second knife holder;

[0070] 14. First doctor blade;

[0071] 15. Second doctor blade;

[0072] 16. First scraper grinding mechanism; 161. First lifting seat; 162. First lifting drive component; 163. Fourth lead screw guide rail assembly; 164. Fifth lead screw nut slider; 165. First grinding roller; 1651. First annular groove; 166. First drive motor;

[0073] 17. Second scraper grinding mechanism; 171. Second lifting seat; 172. Second lifting drive component; 173. Fifth lead screw guide rail assembly; 174. Sixth lead screw nut slider; 175. Second grinding roller; 1751. Second annular groove; 176. Second drive motor. Detailed Implementation

[0074] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0075] Please refer to Figures 1 to 4 This invention relates to a method for polishing plastic doctor blades in printing presses, based on a plastic doctor blade polishing device for printing presses, the device comprising:

[0076] Rack 1;

[0077] Ink tank 2, which is connected to frame 1;

[0078] The printing roller 3 has an axial direction of X and is rotatably connected to the frame 1. The lower part of the printing roller 3 is immersed in the ink tank 2.

[0079] An impression roller 4, the circumferential direction of the impression roller 4 is X-direction, the impression roller 4 is rotatably connected to the frame 1, and the lower part of the impression roller 4 presses against the upper part of the printing roller 3.

[0080] The first lead screw guide rail assembly 5 is connected to the frame 1 in the vertical direction;

[0081] The first lead screw nut slider 6 is slidably connected to the first lead screw guide rail assembly 5;

[0082] The second lead screw guide assembly 7 is connected to the frame 1 in the vertical direction. The second lead screw guide assembly 7 and the first lead screw guide assembly 5 are symmetrically distributed on the X-direction side and the X-direction reverse side of the printing roller 3, respectively.

[0083] The second lead screw slider 8 is slidably connected to the second lead screw guide rail assembly 7;

[0084] The third lead screw guide rail assembly 9 is connected axially in the X direction between the first lead screw nut slider 6 and the second lead screw nut slider 8.

[0085] The third lead screw slider 10 is slidably connected to the third lead screw guide rail assembly 9;

[0086] The fourth lead screw slider 11 is slidably connected to the third lead screw guide rail assembly 9;

[0087] The first tool holder 12 is connected to the third nut slider 10;

[0088] The second tool holder 13 is connected to the fourth nut slider 11;

[0089] The first doctor blade 14 is detachably connected to the first blade holder 12;

[0090] The second doctor blade 15 is detachably connected to the second blade holder 13, and the first doctor blade 14 is located on the X-direction side of the second doctor blade 15.

[0091] The first scraper polishing mechanism 16 is disposed on the X-direction side of the printing roller 3;

[0092] The second scraper polishing mechanism 17 is disposed on the X-direction reverse side of the printing roller 3;

[0093] The polishing method includes the following steps:

[0094] The control of the third lead screw guide assembly 9 drives the third lead screw slider 10 and the fourth lead screw slider 11 to move, so that the second doctor blade 15 is located on the Y-direction side of the printing roller 3;

[0095] The first lead screw guide rail assembly 5 and the second lead screw guide rail assembly 7 are controlled to move synchronously, driving the first lead screw nut slider 6, the second lead screw nut slider 8 and the third lead screw guide rail assembly 9 to move in the vertical direction, so that the second doctor blade 15 just contacts the surface of the printing roller 3; at this time, the first doctor blade 14 is located in the grinding area of ​​the first doctor blade grinding mechanism 16.

[0096] The first doctor blade polishing mechanism 16 is controlled to polish the first doctor blade 14;

[0097] After a period of time, the control of the third lead screw guide assembly 9 drives the third lead screw slider 10 and the fourth lead screw slider 11 to move, so that the first doctor blade 14 is located on the Y-direction side of the printing roller 3;

[0098] The first lead screw guide rail assembly 5 and the second lead screw guide rail assembly 7 are controlled to move synchronously, driving the first lead screw nut slider 6, the second lead screw nut slider 8 and the third lead screw guide rail assembly 9 to move in the vertical direction, and the first doctor blade 14 just contacts the surface of the printing roller 3; at this time, the second doctor blade 15 is located in the grinding area of ​​the second doctor blade grinding mechanism 17.

[0099] The second doctor blade polishing mechanism 17 is controlled to polish the first doctor blade 14.

[0100] In the above embodiments, by setting up structures such as the first lead screw guide assembly 5, the first lead screw nut slider 6, the second lead screw guide assembly 7, the second lead screw nut slider 8, the third lead screw guide assembly 9, the third lead screw nut slider 10, the fourth lead screw nut slider 11, the first blade holder 12, the second blade holder 13, the first doctor blade 14, the second doctor blade 15, the first doctor blade grinding mechanism 16, and the second doctor blade grinding mechanism 17, one doctor blade moves to the surface of the printing roller 3 to scrape ink, while the other doctor blade moves to the corresponding doctor blade grinding mechanism area for grinding. The two doctor blades are used alternately and ground alternately, which effectively reduces the interruption time of replacing doctor blades and improves production efficiency. Since the doctor blades can be reused multiple times after grinding, they no longer need to be discarded directly after wear, which improves the utilization rate of doctor blades and saves production costs.

[0101] In a preferred embodiment, the first scraper polishing mechanism 16 includes:

[0102] The first lifting seat 161 is elliptical and movably connected to the frame 1;

[0103] The first lifting drive component 162 is connected between the frame 1 and the first lifting seat 161 and is used to drive the first lifting seat 161 to move.

[0104] The fourth lead screw guide rail assembly 163 is connected to the first lifting seat 161 along the X direction;

[0105] The fifth lead screw slider 164 is slidably connected to the fourth lead screw guide rail assembly 163;

[0106] The first grinding roller 165 is rotatably connected to the fifth nut slider 164. The axial direction of the first grinding roller 165 is Y-direction. The circumferential surface of the first grinding roller 165 is provided with a first annular groove 1651 that matches the shape of the cutting edge of the first doctor blade 14. A grinding sand layer is provided at the first annular groove 1651.

[0107] The first drive motor 166 is connected to the first grinding roller 165 for driving the first grinding roller 165 to rotate.

[0108] In the aforementioned polishing method, controlling the first doctor blade polishing mechanism 16 to polish the first doctor blade 14 specifically involves: controlling the first lifting drive component 162 to move the first lifting seat 161 so that the first annular groove 1651 of the first polishing roller 165 contacts the cutting edge of the first doctor blade 14; controlling the fourth lead screw guide assembly 163 to drive the fifth lead screw nut slider 164 to reciprocate along the X direction; and controlling the first drive motor 166 to drive the first polishing roller 165 to rotate so that the cutting edge of the first doctor blade 14 is polished during the reciprocating movement of the first polishing roller 165.

[0109] In a preferred embodiment, the first lifting drive 162 includes one or more first telescopic cylinders arranged in the vertical direction, wherein the first telescopic cylinder is a pneumatic cylinder, a hydraulic cylinder or an electric cylinder.

[0110] Furthermore, in the above-mentioned method for polishing plastic doctor blades in printing presses, the second doctor blade polishing mechanism 17 includes:

[0111] The second lifting seat 171 is elliptical and flexibly connected to the frame 1;

[0112] The second lifting drive component 172 is connected between the frame 1 and the second lifting seat 171 and is used to drive the second lifting seat 171 to move.

[0113] The fifth lead screw guide rail assembly 173 is connected to the second lifting seat 171 along the X direction;

[0114] The sixth lead screw slider 174 is slidably connected to the fifth lead screw guide rail assembly 173;

[0115] The second polishing roller 175 is rotatably connected to the sixth nut slider 174. The axial direction of the second polishing roller 175 is Y-direction. The circumferential surface of the second polishing roller 175 is provided with a second annular groove 1751 that matches the shape of the cutting edge of the second doctor blade 15. A polishing sand layer is provided at the second annular groove 1751.

[0116] The second drive motor 176 is connected to the second grinding roller 175 for driving the second grinding roller 175 to rotate.

[0117] In the aforementioned polishing method, controlling the second doctor blade polishing mechanism 17 to polish the second doctor blade 15 specifically involves: controlling the second lifting drive component 172 to move the second lifting seat 171 so that the second annular groove 1751 of the second polishing roller 175 contacts the cutting edge of the second doctor blade 15; controlling the fifth lead screw guide rail assembly 173 to move the sixth lead screw nut slider 174 back and forth along the X direction; and controlling the second drive motor 176 to rotate the second polishing roller 175 so that the cutting edge of the second doctor blade 15 is polished during the back and forth movement of the second polishing roller 175.

[0118] In a preferred embodiment, the second lifting drive 172 includes one or more second telescopic cylinders arranged in a vertical direction, wherein the second telescopic cylinder is a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0119] In a preferred embodiment, the lower part of the first blade holder 12 is provided with a first blade groove for fixing the first doctor blade 14; the first doctor blade 14 is fixed in the first blade groove by bolts.

[0120] In a preferred embodiment, the lower part of the second blade holder 13 is provided with a second blade groove for fixing the second doctor blade 15; the second doctor blade 15 is fixed in the second blade groove by bolts.

[0121] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for polishing plastic doctor blades in printing presses, characterized in that, The printing press plastic doctor blade polishing device includes: frame; Ink tank, which is connected to the frame; A printing roller, the printing roller having an axial direction in the X direction, the printing roller being rotatably connected to the frame, and the lower part of the printing roller being immersed in an ink trough; An impression roller, the impression roller having a circumferential direction of X, the impression roller being rotatably connected to the frame, and the lower part of the impression roller pressing against the upper part of the printing roller; The first lead screw guide rail assembly is connected to the frame in the vertical direction; The first lead screw nut slider is slidably connected to the first lead screw guide rail assembly; The second lead screw guide assembly is connected to the frame in the vertical direction. The second lead screw guide assembly and the first lead screw guide assembly are symmetrically distributed on the X-direction side and the X-direction reverse side of the printing roller, respectively. The second lead screw nut slider is slidably connected to the second lead screw guide rail assembly; The third lead screw guide rail assembly is connected axially in the X direction between the first lead screw nut slider and the second lead screw nut slider; The third lead screw nut slider is slidably connected to the third lead screw guide rail assembly; The fourth lead screw slider is slidably connected to the third lead screw guide rail assembly; The first tool holder is connected to the third nut slider; The second tool holder is connected to the fourth nut slider; The first doctor blade is detachably connected to the first blade holder; The second doctor blade is detachably connected to the second blade holder, and the first doctor blade is located on the X-direction side of the second doctor blade; The first scraper polishing mechanism is located on the X-direction side of the printing roller; The second scraper polishing mechanism is located on the X-direction reverse side of the printing roller; The polishing method includes the following steps: The control of the third lead screw guide assembly drives the third lead screw slider and the fourth lead screw slider to move, so that the second doctor blade is located on the Y-direction side of the printing roller; The first lead screw guide assembly and the second lead screw guide assembly are controlled to move synchronously, which drives the first lead screw nut slider, the second lead screw nut slider and the third lead screw guide assembly to move in the vertical direction, so that the second doctor blade is in contact with the surface of the printing roller; at this time, the first doctor blade is located in the grinding area of ​​the first doctor blade grinding mechanism. Control the first doctor blade polishing mechanism to polish the first doctor blade; After a period of time, the control of the third lead screw guide assembly drives the third lead screw slider and the fourth lead screw slider to move, so that the first doctor blade is located on the Y-direction side of the printing roller; The first lead screw guide assembly and the second lead screw guide assembly are controlled to move synchronously, which drives the first lead screw nut slider, the second lead screw nut slider and the third lead screw guide assembly to move in the vertical direction, and the first doctor blade just contacts the surface of the printing roller; at this time, the second doctor blade is located in the grinding area of ​​the second doctor blade grinding mechanism. The second doctor blade polishing mechanism is controlled to polish the first doctor blade.

2. The method for polishing plastic doctor blades in a printing press according to claim 1, characterized in that, The first scraper grinding mechanism includes: A first lifting seat is movably connected to the frame; A first lifting drive component is connected between the frame and the first lifting seat, and is used to drive the first lifting seat to move; The fourth lead screw guide rail assembly is connected to the first lifting seat along the X direction; The fifth lead screw slider is slidably connected to the fourth lead screw guide rail assembly; The first grinding roller is rotatably connected to the fifth nut slider. The axial direction of the first grinding roller is Y. The circumferential surface of the first grinding roller is provided with a first annular groove that matches the shape of the first doctor blade. The first annular groove is provided with a grinding sand layer. A first drive motor is connected to the first grinding roller via a transmission, and is used to drive the first grinding roller to rotate; In the aforementioned polishing method, controlling the first doctor blade polishing mechanism to polish the first doctor blade specifically involves: controlling the first lifting drive component to move the first lifting seat so that the first annular groove of the first polishing roller contacts the cutting edge of the first doctor blade; controlling the fourth lead screw guide assembly to move the fifth lead screw slider back and forth along the X direction; and controlling the first drive motor to rotate the first polishing roller so that the cutting edge of the first doctor blade is polished during the back and forth movement of the first polishing roller.

3. The method for polishing plastic doctor blades in a printing press according to claim 2, characterized in that, The first lifting drive component includes one or more first telescopic cylinders arranged vertically, wherein the first telescopic cylinder is a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

4. The method for polishing plastic doctor blades in a printing press according to claim 1, characterized in that, The second scraper polishing mechanism includes: The second lifting seat is movably connected to the frame; The second lifting drive component is connected between the frame and the second lifting seat, and is used to drive the second lifting seat to move; The fifth lead screw guide rail assembly is connected to the second lifting seat along the X direction; The sixth lead screw slider is slidably connected to the fifth lead screw guide rail assembly; The second grinding roller is rotatably connected to the sixth nut slider. The axial direction of the second grinding roller is Y. The circumferential surface of the second grinding roller is provided with a second annular groove that matches the shape of the second doctor blade. The second annular groove is provided with a grinding sand layer. The second drive motor is connected to the second grinding roller via a transmission, and is used to drive the second grinding roller to rotate; In the aforementioned polishing method, controlling the second doctor blade polishing mechanism to polish the second doctor blade specifically involves: controlling the second lifting drive component to move the second lifting seat so that the second annular groove of the second polishing roller contacts the cutting edge of the second doctor blade; controlling the fifth lead screw guide assembly to move the sixth lead screw nut slider back and forth along the X direction; and controlling the second drive motor to rotate the second polishing roller so that the cutting edge of the second doctor blade is polished during the back and forth movement of the second polishing roller.

5. The method for polishing plastic doctor blades in a printing press according to claim 4, characterized in that, The second lifting drive component includes one or more vertically arranged second telescopic cylinders, which are pneumatic cylinders, hydraulic cylinders, or electric cylinders.

6. The method for polishing plastic doctor blades in a printing press according to claim 1, characterized in that, The lower part of the first blade holder is provided with a first blade groove for fixing the first doctor blade; the first doctor blade is fixed in the first blade groove by bolts.

7. The method for polishing plastic doctor blades in a printing press according to claim 1, characterized in that, The lower part of the second blade holder is provided with a second blade groove for fixing the second doctor blade; the second doctor blade is fixed in the second blade groove by bolts.

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