CN116728954A - Scraper mechanism of printing machine plate roller and automatic scraper position adjusting method - Google Patents

Abstract

The invention discloses a scraper mechanism of a printing machine plate roller, which is provided with a scraper, and is characterized in that the scraper is movably arranged on a scraper rest, the scraper rest is movably arranged on a rotating shaft, a movable driving component is arranged on the rotating shaft to drive the scraper rest to move, the rotating shaft is arranged on a swinging arm, a mounting seat is arranged on the swinging arm, a rotation adjusting component is arranged on the mounting seat, the rotation adjusting component can drive the rotating shaft to rotate, a compaction driving component is arranged on the swinging arm, the compaction driving component can provide an acting force for the mounting seat, so that the scraper is compacted on the plate roller, the swinging arm is respectively connected with the swinging driving component and the reciprocating driving component, and the scraper mechanism further comprises a controller, and the controller is electrically connected with the movable driving component, the rotation adjusting component, the compaction driving component, the swinging driving component and the reciprocating driving component. According to the automatic adjustment device, automatic adjustment of the position of the scraper can be performed according to the specification of the plate roller, and the adjustment of the position of the scraper is more accurate and the labor intensity of workers is greatly reduced.

Description

Scraper mechanism of printing machine plate roller and automatic scraper position adjusting method

Technical Field

The invention relates to a printing machine, in particular to a scraper mechanism of a printing machine plate roller and a method for automatically adjusting the position of a scraper.

Background

When the printing machine works, printing of patterns is achieved through matching of the plate roller and the rubber roller, wherein the scraper mechanism is mainly used for scraping redundant ink on the plate roller, and further stability of printing is guaranteed. Chinese patent literature (publication No. CN208993288U; publication No. 2019, 6, 18) discloses an adjustable plate roller scraper rack for a printing machine, which comprises a rack and a mounting rack; the automatic scraping device is characterized in that a mounting groove is formed in the right end of the mounting frame, a first adjusting plate, a second adjusting plate, a connecting shaft, a driving gear and a plurality of groups of auxiliary gears are arranged in the mounting groove, the right end of the connecting shaft is connected with the middle part of the left end of the driving gear, the left end of the connecting shaft penetrates through the side wall of the mounting frame from the mounting groove to the left side of the mounting frame, a rotary cap is arranged at the left end of the connecting shaft, the plurality of groups of auxiliary gears are rotatably arranged in the middle part of the left side wall of the mounting groove, the plurality of groups of auxiliary gears and the driving gear are positioned on the same straight line, the bottom end of the first adjusting plate is contacted with the inner bottom wall of the mounting groove, the top ends of the driving gear and the plurality of groups of auxiliary gears are meshed with the inner top wall of the mounting groove, the top end of the first adjusting plate is provided with a second scraper, and the right end of the first adjusting plate is provided with a second scraper; still include preceding connecting axle, back connecting axle, fixed plate, clamp plate, two sets of screwed pipe and two sets of threaded rods, the front side and the rear side on frame top are provided with preceding extension board and back extension board respectively, the one end of preceding connecting axle and back connecting axle respectively with the front end and the rear end fixed connection of mounting bracket, the other end of preceding connecting axle and back connecting axle respectively with the rear end of preceding extension board and the front end rotatable coupling of back extension board, the front side and the rear side of fixed plate left end are connected with the right-hand member top of preceding extension board and back extension board respectively to be provided with the installation through-hole that link up from top to bottom in the first half region and the latter half region of fixed plate, two sets of equal fixed mounting has ball bearing in the installation through-hole, the bottom of two sets of screwed pipe passes the below of two sets of ball bearing to the fixed plate respectively with the front side and the rear side on clamp plate top respectively, the top of two sets of threaded rod inserts respectively and the screw-in the bottom of two sets of screwed pipe is inside, the bottom of clamp plate is provided with the bottom of multiunit screw pipe, the bottom of compression device pastes tightly with the mounting bracket.

The defects of the structure are that: the rotary cap is required to be manually rotated by manpower to drive the rotary shaft and the driving gear to rotate, the position of the scraper is further adjusted, meanwhile, the threaded pipe is also required to be manually rotated, the position of the pressing plate is adjusted up and down through the cooperation of the threaded pipe and the threaded rod, and the pressure between the scraper and the plate roller is adjusted. In order to ensure accurate cooperation between the scraper and the plate roller, a worker with rich experience is often required to manually adjust the position of the scraper, the adjustment mode is complex, time and labor are wasted, and particularly after the plate rollers with different specifications are replaced, the position of the scraper is required to be manually adjusted again, so that the adjustment time is long, and the adjustment accuracy is poor.

Disclosure of Invention

In view of the shortcomings of the background art, the technical problem to be solved by the present invention is to provide a scraper mechanism for a printing press plate roller for solving the above problems.

For this purpose, the invention is realized by adopting the following scheme:

the utility model provides a scraper mechanism of printing machine version roller, has the scraper, the scraper sets up on scraping the knife rest, its characterized in that scraper rest activity sets up in the axis of rotation, is provided with in the axis of rotation and removes drive assembly and drive scraping the knife rest and remove, the axis of rotation sets up on the swing arm, be provided with the mount pad on the swing arm, install rotation regulation subassembly on the mount pad, rotation regulation subassembly can drive the axis of rotation and rotate, the swing arm is connected with swing drive assembly, reciprocating motion drive assembly respectively, still includes the controller, the controller is connected with removal drive assembly, rotation regulation subassembly, swing drive assembly and reciprocating motion drive assembly electricity.

The movable driving assembly comprises a first motor, the output end of the first motor is connected with a screw rod, the screw rod is in threaded connection with the scraper frame, and the scraper frame is matched with the guiding limiting assembly.

The guide limiting assembly comprises a first cam, and the first cam is connected with the adjusting driving assembly, so that the first cam is tightly pressed on the scraper rest.

The scraper frame comprises an upper frame plate and a lower frame plate, a spring is tightly pressed between the upper frame plate and the lower frame plate, a base body is connected to the lower frame plate, a second cam is arranged on the base body, and the second cam tightly presses the upper frame plate, so that the upper frame plate and the lower frame plate tightly clamp the scraper.

The rotary shaft is internally provided with a sliding groove, a sliding block is arranged in the sliding groove, the screw is in threaded connection with the sliding block, the rotary shaft further comprises a connecting sleeve, the upper frame plate and the lower frame plate are respectively provided with a yielding hole for the connecting sleeve to pass through, and the bottom of the connecting sleeve is inserted into the sliding block.

The rotation adjusting assembly comprises a second motor, the output end of the second motor is connected with a first worm, the first worm is meshed with a first worm wheel, and the first worm wheel is connected with a rotating shaft.

The swing arm is hinged with a first cylinder, a piston rod of the first cylinder is hinged with one end of the first transmission arm, the other end of the first transmission arm is connected with a first rotating shaft, a first eccentric sleeve is arranged on the swing arm to rotationally support the first rotating shaft, the outer side wall of the first rotating shaft is provided with a first plane part which is cut, the first rotating shaft penetrates through a first arc-shaped groove on the mounting seat, the diameter of the first rotating shaft corresponds to the inner diameter of the first arc-shaped groove, and the first arc-shaped groove is distributed by taking the axle center of the rotating shaft as the circle center.

The mounting seat is movably arranged on the swing arm, the swing arm is provided with a compaction driving assembly, the compaction driving assembly can provide an acting force for the mounting seat, the scraper is tightly pressed on the plate roller, the compaction driving assembly comprises a second cylinder, a cylinder body of the second cylinder is hinged on the swing arm, a piston rod of the second cylinder is hinged with the mounting seat, and the controller is connected with the compaction driving assembly.

The swing driving assembly comprises a third motor, the output end of the third motor is connected with a second worm, the second worm is meshed with a second worm wheel, the second worm wheel is connected with a second rotating shaft through a key, and the second rotating shaft is connected with one end of the swing arm.

The reciprocating motion driving assembly comprises a fourth motor, the output end of the fourth motor is connected with a third rotating shaft, one end of the third rotating shaft is provided with an eccentric column in an extending mode, the eccentric column is hinged to one end of a connecting rod, and the other end of the connecting rod is hinged to a second rotating shaft.

The swing arm is provided with a second arc-shaped groove, the second arc-shaped groove is distributed by taking the axle center of a second rotating shaft as the center of a circle, a second eccentric sleeve is arranged on the rack, the second eccentric sleeve rotatably supports a fourth rotating shaft, the fourth rotating shaft is connected with a rotation driving assembly, the outer side wall of the fourth rotating shaft is provided with a second plane part which is cut, the fourth rotating shaft penetrates through the second arc-shaped groove, and the diameter of the fourth rotating shaft corresponds to the inner diameter of the second arc-shaped groove.

A method for automatically regulating the position of scraper by using the scraper mechanism of plate roller of printer features that the specification parameters of various plate rollers and their relative regulating parameters are input to memory of controller, and after the plate roller is replaced, the specification parameters of plate roller are input to controller.

When the scraper is in matched contact with the plate roller, the controller can control the compaction driving assembly to apply compaction force to the mounting seat, so that the scraper is tightly pressed on the plate roller.

When printing is carried out, the controller can control the reciprocating driving assembly to drive the swinging arm to carry out horizontal reciprocating movement, and then drive the scraper to carry out horizontal reciprocating movement together.

The scraper mechanism of the printing machine plate roller of the technical scheme has the beneficial effects that: through setting up corresponding removal drive assembly, rotate adjusting part, compress tightly drive assembly, swing drive assembly and reciprocating motion drive assembly and drive the scraper and remove or swing, only need the specification data of the version roller of input replacement for the controller, the controller just can control above-mentioned each subassembly action, and then drive the scraper and remove suitable position and compress tightly on the version roller, replaced traditional manual regulation's mode, very big reduction workman's working method, and make the position control of scraper more accurate, quick, guarantee that the scraper can carry out the scraping operation with version roller cooperation steadily.

Drawings

The invention has the following drawings:

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at the point A;

FIG. 3 is a view of FIG. 1 with portions of the housing and mounting block removed;

FIG. 4 is a view from another perspective of FIG. 1;

FIG. 5 is an enlarged view of a portion of FIG. 4 at the point B;

FIG. 6 is the view of FIG. 5 with the first eccentric sleeve removed;

fig. 7 is a view of the rotating shaft with the upper shelf removed;

FIG. 8 is an enlarged view of a portion of FIG. 7 at the point C;

fig. 9 is a view of fig. 7 with the lower shelf removed;

FIG. 10 is an enlarged view of a portion of FIG. 9 at the point D;

fig. 11 is a block diagram of an upper shelf of the present invention;

FIG. 12 is a block diagram of an alternative guide and stop assembly for use with the present invention.

Detailed Description

As shown in the figure, the scraper mechanism of the printing press plate roller disclosed by the invention is provided with the scraper 49, the scraper 49 is arranged on the scraper rest, the scraper rest is movably arranged on the rotating shaft 15, the moving driving component is arranged on the rotating shaft 15 to drive the scraper rest to move, in the embodiment, the moving driving component comprises a first motor 14, the output end of the first motor 14 is connected with a screw rod, the screw rod is in threaded connection with the scraper rest, the scraper rest is matched with the guiding limiting component to limit the action of the scraper rest, the first motor 14 is controlled to drive the screw rod to rotate, the scraper rest can be driven to move, of course, the moving driving component can also be a linear motor, a gear rack structure or one end of the scraper rest is connected with a spring and is tightly pressed with a cam, the scraper rest can be driven to move by controlling the cam to rotate and being matched with the spring, further, the scraper rest comprises an upper rest plate 27 and a lower rest plate 36, a spring 38 is tightly arranged between the upper rest plate 27 and the lower rest plate 36, a seat body is connected with the second cam 29, the second cam 29 is connected with a handle 28, and the second cam 29 is tightly pressed on the second cam 29 to the upper rest plate 27 and the upper rest plate and the lower rest plate 49 are tightly pressed. The rotating shaft 15 is internally provided with a sliding groove 42, the sliding groove 42 is internally provided with a sliding block 43, a screw rod is in threaded connection with the sliding block 43, the rotating shaft further comprises a connecting sleeve 39, the upper frame plate and the lower frame plate are both provided with a yielding hole 45 for the connecting sleeve to pass through, the bottom of the connecting sleeve 39 is inserted into the sliding block 43, the side wall of the connecting sleeve 39 is provided with a limiting block 41, the yielding hole 45 of the upper frame plate 27 is provided with a yielding groove 44 for the limiting block 41 to pass through, the yielding hole of the lower frame plate 36 is provided with a containing groove 40 for the limiting block 41 to pass through in a rotating way, when the connecting sleeve 39 is inserted into the upper frame plate and the lower frame plate, the limiting block 41 firstly passes through the yielding groove 44 and stretches into the containing groove 40, then the connecting sleeve 39 is rotated, the limiting block 41 can be moved to the other position of the containing groove 40, at the moment, the upper frame plate and the lower frame plate are clamped respectively, the positioning of the connecting sleeve 39 is realized, the connecting sleeve 39 is prevented from being pulled out in the use process, and the first motor 14 is controlled to drive the screw rod to rotate, so that the sliding block 43 and the scraper frame can be driven to move. The guide limiting assembly includes a first cam 18, the first cam 18 being coupled to the adjustment drive assembly such that the first cam 18 is compressed against the doctor blade holder. Specifically, the adjusting driving component may be a third cylinder 16, the cylinder body of the third cylinder 16 is hinged on the rotating shaft 15, the piston rod of the third cylinder 16 is hinged with one end of the swing arm 17, the first cam 18 is integrally formed at the other end of the swing arm 17 and hinged on a hinged seat on the rotating shaft 15, the swing arm 17 is driven to swing by controlling the third cylinder 16, the first cam 18 can be driven to rotate and be tightly pressed on the scraper rack, and further the moving direction of the scraper rack is limited, of course, the adjusting driving component may also be a swing seat 48, one end of the first cam 18 is extendedly provided with a connecting shaft 46, the connecting shaft 46 is connected on the swing seat 48, the piston rod of the third cylinder 16 is hinged with the swing seat 48, the swing seat 48 is driven to swing by controlling the third cylinder 16 to swing, the connecting shaft 46 and the first cam 18 can also be driven to rotate, the first cam is tightly pressed on the scraper rack, and the whole dismounting of the scraper rack is more convenient by replacing the traditional sliding rail and sliding seat matching structure by the cam compressing limiting mode. The rotation shaft 15 is arranged on the swinging arm 9, the mounting seat 13 is arranged on the swinging arm 9, the rotation adjusting component is arranged on the mounting seat 13 and can drive the rotation shaft 15 to rotate, in the embodiment, the rotation adjusting component comprises a second motor 24, the output end of the second motor 24 is connected with a first worm 22, the first worm 22 is meshed with a first worm wheel 23, the first worm wheel 23 is connected with the rotation shaft 15, a self-locking coefficient is adopted between the first worm 22 and the first worm wheel 23, the rotation can not happen after the adjustment is in place, the mounting seat 13 is movably arranged on the swinging arm 9, the swinging arm 9 is provided with a compression driving component, the compression driving component can provide an acting force for the mounting seat 13, the scraper 49 is tightly pressed on the plate roller 26, the controller is electrically connected with the compression driving component, in particular, the compression driving component comprises a second cylinder 25, the cylinder body of the second cylinder 25 is hinged on the swinging arm 9, the piston rod of the second air cylinder 25 is hinged with the mounting seat 13, further, the swing arm 9 is hinged with a first air cylinder 30, the piston rod of the first air cylinder 30 is hinged with one end of a first transmission arm 31, the other end of the first transmission arm 31 is connected with a first rotating shaft 32, the swing arm 9 is provided with a first eccentric sleeve 33 for rotatably supporting the first rotating shaft 32, the outer side wall of the first rotating shaft 32 is provided with a first plane part 35 which is cut, the first rotating shaft 32 passes through a first arc-shaped groove 34 on the mounting seat 13, the diameter of the first rotating shaft 32 corresponds to the inner diameter of the first arc-shaped groove 34, namely, the diameter of the first rotating shaft 32 is equal to or slightly smaller than the inner diameter of the first arc-shaped groove 34, the first arc-shaped groove 34 is distributed by taking the axle center of the rotating shaft 15 as the center of a circle, by the design, after the first rotating shaft 32 is controlled to rotate to a proper angle due to the arrangement of the first rotating shaft 32 in the first eccentric sleeve 33, the first plane portion 35 of the first rotating shaft 32 can prop against the inner wall of the first arc-shaped groove 34 to further ensure that the mounting seat 13 cannot rotate, further provide a supporting force for the first worm wheel and the worm in the mounting seat 13 when being matched to rotate, ensure that the first worm and the worm wheel can be matched to rotate stably, of course, the rotation adjusting component can also be a servo motor and a reduction gearbox which are arranged independently, the output end of the reduction gearbox is connected with the first rotating shaft 32, or the motor is matched with the connecting rod mechanism to drive the first rotating shaft 32 to rotate, after the first worm wheel and the worm are rotated and adjusted, the first cylinder 30 drives the first rotating shaft 32 to rotate by a proper angle, at the moment, the first rotating shaft 32 does not apply a supporting force to the first arc-shaped groove 34 any more, the mounting seat 13 is not subjected to positioning acting force any more, and then the piston rod of the second cylinder 25 is controlled to apply an acting force to the mounting seat 13, and the acting force is transmitted to the scraper 49 through the mounting seat 13, the rotating shaft 15 and the scraper frame, so that the scraper 49 is tightly pressed on the plate roller 26. Of course, the compressing driving assembly can also be a structure of a spring and a pressing plate, the spring is compressed between the pressing plate and the mounting seat, the pressing plate is connected with mechanisms such as a linear motor and an air cylinder, and the like, the compressing force on the mounting seat 13 can be adjusted by controlling the pressing plate to move, the swinging arm 9 is respectively connected with the swinging driving assembly and the reciprocating driving assembly, specifically, the swinging driving assembly comprises a third motor 12, the output end of the third motor 12 is connected with a second worm, the second worm is meshed with a second worm wheel 21, a self-locking coefficient is adopted between the second worm and the second worm wheel 21, the second worm wheel 21 is guaranteed not to rotate after being adjusted in place, the second worm wheel 21 is connected with a second rotating shaft 10 in a key manner, and the second rotating shaft 10 is connected with one end of the swinging arm 9. The swing arm 9 is provided with a second arc-shaped groove 20, the second arc-shaped groove 20 is distributed by taking the axle center of the second rotating shaft 10 as the circle center, the frame 1 is provided with a second eccentric sleeve 4, the second eccentric sleeve 4 rotatably supports the fourth rotating shaft 11, the fourth rotating shaft 11 is connected with a rotation driving assembly, the specific rotation driving assembly comprises a fourth air cylinder 2, a piston rod of the fourth air cylinder 2 is hinged with one end of the second driving arm 3, the other end of the second driving arm 3 is connected with the fourth rotating shaft 11, the second arc-shaped groove 11 can be driven to rotate by controlling the action of the fourth air cylinder 2 and through the transmission of the second driving arm 3, the outer side wall of the fourth rotating shaft 11 is provided with a second plane 19 which is cut, the fourth rotating shaft 11 penetrates through the second arc-shaped groove 20, the diameter of the fourth rotating shaft 11 corresponds to the inner diameter of the second arc-shaped groove 20, after the angle of the swing arm 9 swings in place, the fourth rotating shaft 11 can be controlled to rotate, and the second plane 19 on the fourth rotating shaft 11 provides a supporting force for the inner wall of the second arc-shaped groove 20, and the swing arm is ensured not to deviate again after the swing in place. Of course, the swing driving assembly can also be a servo motor and reduction gearbox structure, the output end of the reduction gearbox is connected with the fourth rotating shaft 11, or the reduction gearbox is matched with the connecting rod mechanism through the servo motor, the fourth rotating shaft 11 is driven to rotate, the reciprocating movement driving assembly comprises a fourth motor 5, the output end of the fourth motor 5 is connected with a third rotating shaft 6, one end of the third rotating shaft 6 is extended and provided with an eccentric column 7, the eccentric column 7 is hinged with one end of a connecting rod 8, the other end of the connecting rod 8 is hinged with the second rotating shaft 10, the fourth motor 5 is controlled to rotate, the third rotating shaft 6 can be driven to rotate, the second rotating shaft 10, the swinging arm 9 and the scraper 49 are driven to horizontally reciprocate through the eccentric column 7 and the connecting rod 8, all parts of the scraper 49 can be guaranteed to uniformly scrape ink, excessive abrasion caused by local use of the scraper 49 is avoided, and further the scraping quality is guaranteed. Of course, the reciprocating driving assembly can also be a common horizontal driving structure such as a linear motor, a gear rack mechanism, a spring and cam matching mechanism and the like, and further comprises a controller, wherein the controller is electrically connected with the moving driving assembly, the rotation adjusting assembly, the pressing driving assembly, the swinging driving assembly and the reciprocating driving assembly.

The method for automatically adjusting the position of the scraper by adopting the scraper mechanism inputs specification parameters of various plate rollers 26 and corresponding adjustment parameters into a memory of a controller in advance, wherein the adjustment parameters are empirical values, pass a plurality of tests in advance and have data with optimal effect, and when the adjustment parameters are stored in the memory, the adjustment parameters comprise corresponding parameters such as the angle after the swinging arm swings, the inclination angle of the scraper after the rotating shaft rotates, the final position after the scraper frame moves, and the like. When the plate roller is replaced, the replaced plate roller parameters are input into the controller, such as the diameter of the plate roller, the controller invokes the corresponding group of adjusting parameters to match the swinging angle of the swinging arm, the tilting angle of the scraper after the rotation shaft rotates and the final position of the scraper frame after the scraper frame moves, so that automatic control is performed, and automatic foolproof adjustment is realized.

After the swing arm 9, the rotating shaft 15 and the scraper frame are controlled to act by using the parameters, the scraper can be contacted with the plate roller 26 at an optimal angle to carry out ink scraping operation, after the plate roller 26 is replaced, specification parameters of the plate roller 26 after replacement are input to the controller, the controller calls corresponding adjustment parameters stored in the memory according to the input plate roller specification parameters, controls the swing driving assembly to drive the swing arm 9 to swing to a required angle, then controls the rotation adjusting assembly to drive the rotating shaft 15 to rotate so that the scraper swings to a required inclination angle, and controls the movement driving assembly to drive the scraper frame to move a corresponding position, so that the scraper 49 is matched and contacted with the plate roller 26 at an appropriate angle, and further ink scraping quality is ensured. Further, after the doctor 49 is in contact with the plate roller 26, the controller controls the pressing driving assembly to apply a pressing force to the mounting seat 13, so that the doctor 49 is pressed against the plate roller 26, and the stability of ink scraping is ensured. When printing is performed, the controller can control the reciprocating driving assembly to drive the swinging arm 9 to horizontally reciprocate, and further drive the scraper 49 to horizontally reciprocate together, so that the situation that the scraper 49 is matched with the plate roller at the same position for scraping ink all the time to cause serious abrasion is avoided, and the ink scraping quality is ensured.

According to the structure, the corresponding moving driving assembly, the rotating adjusting assembly, the compressing driving assembly, the swinging driving assembly and the reciprocating driving assembly are arranged to drive the scraper to move or swing, the controller can control the movement of the assemblies only by inputting the specification data of the replaced plate roller to the controller, and then the scraper is driven to move to a proper position and to be compressed on the plate roller, a traditional manual adjusting mode is replaced, the labor mode of workers is greatly reduced, the position adjustment of the scraper is more accurate and rapid, and the scraper can be ensured to be matched with the plate roller to perform ink scraping operation stably.

Claims (14)

1. The utility model provides a scraper mechanism of printing machine version roller, has scraper (49), scraper (49) set up on scraping the knife rest, its characterized in that scraper rest activity sets up on axis of rotation (15), is provided with on axis of rotation (15) and removes drive assembly and drive scraping the knife rest and remove, axis of rotation (15) set up on swing arm (9), be provided with mount pad (13) on swing arm (9), install rotation regulation subassembly on mount pad (13), rotation regulation subassembly can drive axis of rotation (15) and rotate, swing arm (9) are connected with swing drive assembly, reciprocating motion drive assembly respectively, still include the controller, the controller is connected with removal drive assembly, rotation regulation subassembly, swing drive assembly and reciprocating motion drive assembly electricity.

2. The doctor mechanism of a printing press plate roller according to claim 1, wherein the movement driving assembly comprises a first motor (14), the output end of the first motor (14) is connected with a screw rod, the screw rod is in threaded connection with a doctor frame, and the doctor frame is matched with the guiding limiting assembly.

3. Doctor mechanism for a printing press cylinder according to claim 2, characterized in that the guiding and limiting assembly comprises a first cam (18), the first cam (18) being connected to the adjustment drive assembly such that the first cam (18) is pressed against the doctor blade holder.

4. Doctor mechanism for a printing press cylinder according to claim 1 or 2, characterized in that the doctor frame comprises an upper frame plate (27) and a lower frame plate (36), a spring (38) being arranged between the upper frame plate (27) and the lower frame plate (36) in a pressed manner, a seat being connected to the lower frame plate (36), a second cam (29) being arranged on the seat, the second cam (29) being pressed against the upper frame plate (27) such that the upper and lower frame plates clamp the doctor (49).

5. The scraper mechanism of a printing press plate roller according to claim 4, characterized in that a chute (42) is arranged in the rotating shaft (15), a sliding block (43) is arranged in the chute (42), the screw is in threaded connection with the sliding block (43), the scraper mechanism further comprises a connecting sleeve (39), the upper frame plate and the lower frame plate are respectively provided with a yielding hole (45) for the connecting sleeve to pass through, and the bottom of the connecting sleeve (39) is inserted into the sliding block (43).

6. Doctor mechanism for a printing press cylinder according to claim 1, characterized in that the rotation adjustment assembly comprises a second motor (24), the output of the second motor (24) being connected to a first worm (22), the first worm (22) being in engagement with a first worm wheel (23), the first worm wheel (23) being connected to the rotation shaft (15).

7. Doctor mechanism for a printing press cylinder according to claim 1, characterized in that the mounting base (13) is movably arranged on the oscillating arm (9), that the oscillating arm (9) is provided with a compacting drive assembly, which compacting drive assembly can provide the mounting base (13) with a force such that the doctor (49) is compacted on the cylinder (26), that the compacting drive assembly comprises a second cylinder (25), that the cylinder of the second cylinder (25) is hinged on the oscillating arm (9), that the piston rod of the second cylinder (25) is hinged with the mounting base (13), and that the controller is electrically connected with the compacting drive assembly.

8. Doctor mechanism for printing press plate roller according to claim 6 or 7, characterized in that the swinging arm (9) is hinged with a first cylinder (30), a piston rod of the first cylinder (30) is hinged with one end of a first transmission arm (31), the other end of the first transmission arm (31) is connected with a first rotating shaft (32), a first eccentric sleeve (33) is arranged on the swinging arm (9) to rotatably support the first rotating shaft (32), the outer side wall of the first rotating shaft (32) is provided with a first plane part (35) which is cut, the first rotating shaft (32) penetrates through a first arc-shaped groove (34) on the mounting seat (13), the diameter of the first rotating shaft (32) corresponds to the inner diameter of the first arc-shaped groove (34), and the first arc-shaped groove (34) is arranged by taking the axle center of the rotating shaft (15) as the center of a circle.

9. Doctor mechanism for a printing press cylinder according to claim 1, characterized in that the oscillating drive assembly comprises a third motor (12), the output of the third motor (12) being connected to a second worm, the second worm being in engagement with a second worm wheel (21), the second worm wheel (21) being in keyed connection with a second spindle (10), the second spindle (10) being connected with one end of the oscillating arm (9).

10. Doctor mechanism for a printing press plate roller according to claim 9, characterized in that the reciprocating drive assembly comprises a fourth motor (5), the output end of the fourth motor (5) is connected with a third rotating shaft (6), one end of the third rotating shaft (6) is provided with an eccentric column (7) in an extending manner, the eccentric column (7) is hinged with one end of a connecting rod (8), and the other end of the connecting rod (8) is hinged with a second rotating shaft (10).

11. The scraper mechanism of a printing press plate roller according to claim 9, characterized in that a second arc-shaped groove (20) is formed in the swinging arm (9), the second arc-shaped groove (20) is arranged by taking the axle center of the second rotating shaft (10) as the circle center, a second eccentric sleeve (4) is arranged on the frame (1), the second eccentric sleeve (4) rotatably supports a fourth rotating shaft (11), the fourth rotating shaft (11) is connected with a rotation driving assembly, a second plane part (19) which is cut is arranged on the outer side wall of the fourth rotating shaft (11), the fourth rotating shaft (11) penetrates through the second arc-shaped groove (20), and the diameter of the fourth rotating shaft (11) corresponds to the inner diameter of the second arc-shaped groove (20).

12. A method for automatically adjusting the doctor position by using the doctor mechanism of the printing press plate roller according to any one of claims 1-11, characterized in that specification parameters of various plate rollers (26) and corresponding adjustment parameters are input into a memory of a controller in advance, after the plate rollers (26) are replaced, specification parameters of the replaced plate rollers (26) are input into the controller, the controller calls the corresponding adjustment parameters stored in the memory according to the input specification parameters of the plate rollers, controls a swinging driving assembly to drive a swinging arm (9) to swing to a required angle, then controls a rotation adjusting assembly to drive a rotating shaft (15) to rotate so as to enable the doctor to swing to a required inclination angle, and controls a moving driving assembly to drive the doctor to move to a corresponding position so as to enable the doctor (49) to be in fit contact with the plate rollers (26) at a proper angle.

13. A method of automatically adjusting the position of a doctor blade according to claim 12, wherein the controller controls the hold-down drive assembly to apply a hold-down force to the mounting block (13) after the doctor blade (49) is brought into mating contact with the plate roller such that the doctor blade is held down against the plate roller (26).

14. The automatic doctor blade position adjustment method according to claim 12, wherein the controller controls the reciprocating drive assembly to reciprocate the oscillating arm (9) horizontally and thereby reciprocate the doctor blade (49) horizontally together during printing.