Special doctor blade device for offset press

Abstract

The utility model relates to the technical field of offset presses, and discloses a doctor blade device special for an offset press, which comprises a bottom plate, an ink storage box is mounted at the top of the bottom plate, two support frames are mounted on the left side of the top of the bottom plate, the front side and the back side of the ink storage box are fixedly connected to one sides of the two support frames respectively, and a conveying assembly is mounted between the two support frames. Sliding straight grooves are formed in the right side of the top of the bottom plate. According to the scraper replacing device, the scraper replacing assembly is arranged, when the scraper is damaged, a worm is rotated, so that a worm gear drives a small lead screw to rotate, a limiting barrel moves upwards, limitation on the scraper is relieved, the damaged scraper is taken down and replaced with a new scraper, and after replacement is completed, the worm is rotated reversely, so that the worm drives the small lead screw to rotate through the worm gear; and therefore, the limiting barrel is inserted into the limiting hole in the scraper again, the position of the scraper is fixed, when the scraper is damaged, the scraper can be conveniently replaced, and the replacement efficiency of the scraper is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of offset printing machines, in particular to a special ink scraper device for offset printing machines. Background Art

[0002] An offset printing press is a type of lithographic printing press. During printing, the printed image is first printed from the printing plate onto a rubber cylinder, and then transferred to paper by the rubber cylinder.

[0003] A Chinese utility model patent with publication number CN219486911U discloses an ink scraping mechanism for an offset printing machine. By setting a scraper device, the scraper blade is set at an angle to abut against the surface of the offset roller, so that the ink flows obliquely and smears the surface of the offset roller for a second time, thereby increasing the uniformity of the ink on the surface of the offset roller.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: after long-term use, the scraper is easily damaged and needs to be removed and replaced with a new one. The scraper blade and the blade holder on the device are connected by riveting. This method requires the rivets to be removed first when installing and removing the scraper blade, and then the new scraper blade needs to be fixed with rivets after replacement, which is very inconvenient. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, the utility model provides a special ink scraper device for an offset printing machine.

[0006] The utility model is implemented by the following technical scheme: a special scraper device for an offset printing machine comprises a bottom plate, an ink storage box is installed on the top of the bottom plate, two support frames are installed on the left side of the top of the bottom plate, the front and back sides of the ink storage box are respectively fixedly connected to one side of the two support frames, a conveying assembly is installed between the two support frames, a sliding straight groove is opened on the right side of the top of the bottom plate, two directional rods and a threaded rod are installed inside the sliding straight groove, one end of the threaded rod is fixedly connected to an adjusting motor, the outer side of the threaded rod is threadedly connected to a moving plate, the moving plate is slidably arranged on the outer side of the directional rod, and the left side of the moving plate is installed with a scraper assembly.

[0007] The conveying assembly includes an offset roller, the surface of which is in contact with a conveying roller and an ink feed roller, the two ends of an intermediate shaft of the offset roller are respectively fixedly connected with an offset motor and a driving gear, the surface of the driving gear is meshedly connected with two transmission gears, and two driven gears are respectively fixedly connected to one end of the intermediate shaft of the conveying roller and the ink feed roller, a guide roller is installed above the conveying roller, and the two ends of the intermediate shaft of the guide roller are respectively rotatably connected to one side of the two support frames.

[0008] The ink scraping assembly includes two movable slot plates, the movable slot plates and the movable plates are connected by two spring rods, a supporting block is fixedly connected between the two movable slot plates, the supporting block is slidably arranged inside the movable plate, connecting blocks are slidably arranged inside the two movable slot plates, the internal thread of the front connecting block is connected with a lifting screw rod, the lifting screw rod is installed inside the front movable slot plate, the internal thread of the back connecting block is connected with a guide rod, the guide rod is installed inside the back movable slot plate, the left side of the connecting block is fixedly connected to a limiting plate, both sides of the surface of the limiting plate are rotatably connected with adjusting screw rods, the outer side of the adjusting screw rod is threadedly connected with a movable cylinder, the top of the movable cylinder is rotatably connected with a movable seat, and the top of the movable seat is installed with a tool changing assembly.

[0009] The tool changing assembly includes a fixing plate, a card slot and a mounting slot are respectively opened on the right side of the fixing plate, a scraper is installed in the card slot, a worm is installed inside the mounting slot, a worm wheel is connected to the surface of the worm wheel at equal intervals, a small lead screw is connected through the axis of the worm wheel, and the surface of the small lead screw is threadedly connected to a limiting cylinder.

[0010] As a further improvement of the above solution, a sliding support groove for the sliding of the movable seat is provided at the bottom of the fixed plate, so as to ensure that the movable seat can work normally to lift up the fixed plate.

[0011] As a further improvement of the above scheme, two clamping strips are fixedly connected to the surface of the limit cylinder, and the surface of the scraper is provided with limit holes for the limit cylinder and the clamping strips to pass through at equal intervals, thereby ensuring the normal movement of the limit cylinder without deflection.

[0012] As a further improvement of the above solution, one end of the worm is fixedly connected to a handwheel to facilitate the rotation of the worm.

[0013] As a further improvement of the above solution, two linear limiting grooves are provided on the surface of the movable cylinder, and a clamping block is slidably arranged inside the linear limiting groove. The clamping block is fixedly connected to the top of the limiting plate to ensure the normal movement of the movable cylinder without deflection.

[0014] As a further improvement of the above solution, the front side of the ink storage cartridge is connected with a feed pipe, which is connected through the front support frame to facilitate adding ink into the ink storage cartridge.

[0015] As a further improvement of the above solution, a mounting seat is installed at the bottom of the offset motor, and the mounting seat is fixedly connected to the front side of the front support frame to ensure the normal operation of the offset motor.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model provides a knife changing assembly, when the scraper is damaged, the worm is rotated, so that the worm wheel drives the small lead screw to rotate, thereby the limiting cylinder moves upward, the restriction of the limiting cylinder on the scraper is released, the damaged scraper is removed and replaced with a new one, and after the replacement is completed, the worm is rotated in the opposite direction, so that the worm wheel drives the small lead screw to rotate through the worm wheel, so that the limiting cylinder is reinserted into the limiting hole on the scraper, the position of the scraper is fixed, so that the scraper can be conveniently replaced when the scraper is damaged, thereby improving the replacement efficiency of the scraper.

[0018] The utility model provides an ink scraping assembly, when it is necessary to adjust the contact angle of the scraper, the adjusting screw rod is rotated, the adjusting screw rod drives the moving cylinder to move, so that the moving seat lifts one side of the fixed plate, thereby changing the contact angle of the scraper, and then the lifting screw rod is rotated to adjust the height position of the fixed plate, and finally the adjusting motor is started, so that the threaded rod drives the moving plate to move toward the offset roller until the scraper abuts against the surface of the offset roller, thereby completing the adjustment of the angle position of the scraper, and facilitating the adjustment of the inclination angle of the ink scraper as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the driving gear, driven gear and offset printing roller of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the adjusting screw rod, the moving cylinder and the lifting screw rod of the utility model;

[0022] Figure 4 It is a structural schematic diagram of a small lead screw, a worm and a small lead screw of the utility model.

[0023] Description of main symbols:

[0024] Bottom plate; 2. Ink storage box; 3. Support frame; 4. Threaded rod; 5. Moving plate; 6. Offset roller; 7. Ink feed roller; 8. Transport roller; 9. Driving gear; 10. Driven gear; 11. Moving slot plate; 12. Support block; 13. Connecting block; 14. Lifting screw; 15. Limiting plate; 16. Adjusting screw; 17. Moving cylinder; 18. Moving seat; 19. Fixed plate; 20. Scraper; 21. Worm; 22. Worm wheel; 23. Small screw; 24. Limiting cylinder. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment. Example

[0026] Please combine Figure 1-4 The present embodiment is a special scraper device for an offset printing machine, comprising a bottom plate 1, an ink storage cartridge 2 is installed on the top of the bottom plate 1, a feed pipe is connected to the front of the ink storage cartridge 2, and the feed pipe is connected to the front support frame 3 through the front support frame 3, so as to facilitate the addition of ink into the ink storage cartridge 2, two support frames 3 are installed on the left side of the top of the bottom plate 1, the front and back of the ink storage cartridge 2 are respectively fixedly connected to one side of the two support frames 3, a conveying assembly is installed between the two support frames 3, a sliding straight groove is opened on the right side of the top of the bottom plate 1, two directional rods and a threaded rod 4 are installed inside the sliding straight groove, one end of the threaded rod 4 is fixedly connected to an adjusting motor, a movable plate 5 is threadedly connected to the outer side of the threaded rod 4, the movable plate 5 is slidably arranged on the outer side of the directional rod, and an ink scraper assembly is installed on the left side of the movable plate 5.

[0027] The conveying assembly is used to convey paper and apply ink to the paper. The conveying assembly includes an offset roller 6, which is used to apply ink to the paper. The surface of the offset roller 6 is abutted with a conveying roller 8 and an ink feeding roller 7. The conveying roller 8 is used to drive the paper for conveying, and the ink feeding roller 7 is used to apply the ink in the ink storage box 2 to the surface of the offset roller 6. The two ends of the intermediate shaft of the offset roller 6 are respectively fixedly connected with an offset motor and a driving gear 9. A mounting seat is installed at the bottom of the offset motor, and the mounting seat is fixedly connected to the front of the front support frame 3 to ensure the normal operation of the offset motor. The surface of the driving gear 9 is meshingly connected with two transmission gears 10. The two driven gears 10 are respectively fixedly connected to one end of the intermediate shaft of the conveying roller 8 and the ink feeding roller 7. A guide roller is installed above the conveying roller 8, and the two ends of the intermediate shaft of the guide roller are respectively rotatably connected to one side of the two support frames 3.

[0028] The ink scraping assembly is used to adjust the inclination angle of the scraper 20 to a height position. The ink scraping assembly includes two movable slot plates 11. The movable slot plates 11 and the movable plate 5 are connected by two spring rods. A support block 12 is fixedly connected between the two movable slot plates 11. The support block 12 is slidably arranged inside the movable plate 5. A connecting block 13 is slidably arranged inside the two movable slot plates 11. The internal thread of the front connecting block 13 is connected to a lifting screw rod 14. The lifting screw rod 14 is installed inside the front movable slot plate 11. A guide is arranged inside the back connecting block 13. Rod, guide rod is installed inside the back moving groove plate 11, the left side of the connecting block 13 is fixedly connected to the limit plate 15, both sides of the surface of the limit plate 15 are rotatably connected with adjusting screw rods 16, the outer side of the adjusting screw rod 16 is threadedly connected with a moving cylinder 17, the surface of the moving cylinder 17 is provided with two linear limiting grooves, the inner sliding of the linear limiting groove is provided with a card block, the card block is fixedly connected to the top of the limit plate 15 to ensure the normal movement of the moving cylinder 17 without deflection, the top of the moving cylinder 17 is rotatably connected with a moving seat 18, and the top of the moving seat 18 is installed with a tool changing assembly.

[0029] The tool changing assembly facilitates the replacement of the scraper 20. The tool changing assembly includes a fixed plate 19. A sliding support groove for the sliding of the movable seat 18 is provided at the bottom of the fixed plate 19 to ensure that the movable seat 18 can work normally to lift the fixed plate 19. A card slot and a mounting slot are respectively provided on the right side of the fixed plate 19. The scraper 20 is installed in the card slot. A worm 21 is installed inside the mounting slot. One end of the worm 21 is fixedly connected to a handwheel for convenient rotation of the worm 21. A worm wheel 22 is transmission-connected to the surface of the worm 21 at equal intervals. A small lead screw 23 is connected through the axis of the worm wheel 22. The surface of the small lead screw 23 is threadedly connected to a limiting cylinder 24. Two clamping strips are fixedly connected to the surface of the limiting cylinder 24. Limiting holes for the limiting cylinder 24 and the clamping strips to pass through are provided at equal intervals on the surface of the scraper 20 to ensure the normal movement of the limiting cylinder 24 without deflection.

[0030] The implementation principle of a scraper device dedicated to an offset printing machine in the embodiment of the present application is as follows: when the scraper 20 is damaged, the worm 21 is rotated so that the worm wheel 22 drives the small lead screw 23 to rotate, thereby causing the limiting cylinder 24 to move upward, causing the limiting cylinder 24 to disengage from the limiting hole on the scraper, and then the damaged scraper 20 is removed and replaced with a new scraper 20. After the replacement is completed, the worm 21 is rotated in the opposite direction so that the worm 21 drives the small lead screw 23 to rotate in the opposite direction through the worm wheel 22, thereby causing the limiting cylinder 24 to be reinserted into the limiting hole on the scraper 20, and the position of the scraper 20 is fixed, so that when the scraper 20 is damaged, the scraper 20 can be conveniently replaced, thereby improving the replacement efficiency of the scraper 20.

[0031] The contact angle of the scraper 20, that is, the angle between the tangent of the contact point of the scraper 20 and the offset roller 6 and the scraper 20, has an important influence on the printing quality. When adjusting the contact angle of the scraper 20, rotate one of the adjusting screws 16, and the adjusting screw 16 will drive the moving cylinder 17 to move, so that the moving seat 18 will lift one side of the fixed plate 19, thereby changing the contact angle of the scraper 20, and then rotate the lifting screw 14 to adjust the height position of the fixed plate 19, and finally start the adjusting motor, so that the threaded rod 4 drives the moving plate 5 to move toward the offset roller 6 until the scraper 20 abuts against the surface of the offset roller 6, completing the adjustment of the contact angle of the scraper 20, so as to facilitate the adjustment of the contact angle of the scraper ink as needed.

[0032] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A doctor blade device for an offset printing machine, characterized in that: The invention comprises a bottom plate (1), an ink storage box (2) is installed on the top of the bottom plate (1), two support frames (3) are installed on the left side of the top of the bottom plate (1), the front and back sides of the ink storage box (2) are respectively fixedly connected to one side of the two support frames (3), a conveying assembly is installed between the two support frames (3), a sliding straight groove is opened on the right side of the top of the bottom plate (1), two directional rods and a threaded rod (4) are installed inside the sliding straight groove, one end of the threaded rod (4) is fixedly connected to an adjustment motor, the outer side of the threaded rod (4) is threadedly connected to a moving plate (5), the moving plate (5) is slidably arranged on the outer side of the directional rod, and an ink scraping assembly is installed on the left side of the moving plate (5); The conveying assembly comprises an offset roller (6), the surface of the offset roller (6) is in contact with a conveying roller (8) and an ink feeding roller (7), the two ends of the intermediate shaft of the offset roller (6) are respectively fixedly connected to an offset motor and a driving gear (9), the surface of the driving gear (9) is meshingly connected to two transmission gears (10), the two driven gears (10) are respectively fixedly connected to one end of the intermediate shaft of the conveying roller (8) and the ink feeding roller (7), a guide roller is installed above the conveying roller (8), and the two ends of the intermediate shaft of the guide roller are respectively rotatably connected to one side of the two support frames (3); The ink scraping assembly comprises two movable slot plates (11), wherein the movable slot plates (11) and the movable plate (5) are connected via two spring rods, a support block (12) is fixedly connected between the two movable slot plates (11), the support block (12) is slidably arranged inside the movable plate (5), a connecting block (13) is slidably arranged inside the two movable slot plates (11), the interior of the front connecting block (13) is threadedly connected with a lifting screw rod (14), the lifting screw rod (14) is installed inside the front movable slot plate (11), a guide rod is penetrated inside the rear connecting block (13), the guide rod is installed inside the rear movable slot plate (11), the left side of the connecting block (13) is fixedly connected with a limit plate (15), both sides of the surface of the limit plate (15) are rotatably connected with an adjusting screw rod (16), the outer side of the adjusting screw rod (16) is threadedly connected with a movable cylinder (17), the top of the movable cylinder (17) is rotatably connected with a movable seat (18), and the top of the movable seat (18) is installed with a tool changing assembly; The tool changing assembly comprises a fixing plate (19), a clamping groove and a mounting groove are respectively provided on the right side of the fixing plate (19), a scraper (20) is mounted in the clamping groove, a worm (21) is mounted inside the mounting groove, a worm wheel (22) is connected to the surface of the worm wheel (21) at equal intervals, a small lead screw (23) is connected to the axis of the worm wheel (22), and a limit cylinder (24) is threadedly connected to the surface of the small lead screw (23).

2. A doctor blade device for offset printing press as claimed in claim 1, characterized in that: The bottom of the fixed plate (19) is provided with a sliding support groove for the movable seat (18) to slide.

3. The ink scraper device for offset printing press according to claim 1, characterized in that: Two clamping strips are fixedly connected to the surface of the limiting cylinder (24), and limiting holes for the limiting cylinder (24) and the clamping strips to pass through are provided at equal intervals on the surface of the scraper (20).

4. The ink scraper device for offset printing press according to claim 1, characterized in that: One end of the worm (21) is fixedly connected to a hand wheel.

5. The ink scraper device for offset printing press according to claim 1, characterized in that: The surface of the moving cylinder (17) is provided with two linear limiting grooves, and a clamping block is slidably arranged inside the linear limiting groove, and the clamping block is fixedly connected to the top of the limiting plate (15).

6. The ink scraper device for offset printing press according to claim 1, characterized in that: The front side of the ink storage box (2) is connected to a feed pipe, which penetrates and is connected to the front support frame (3).

7. The ink scraper device for offset printing press according to claim 1, characterized in that: A mounting seat is installed at the bottom of the offset printing motor, and the mounting seat is fixedly connected to the front side of the front support frame (3).

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