Closed ink scraping device

Abstract

The utility model relates to a closed ink scraping device, which belongs to the technical field of printing and is characterized in that one end of a lower scraper, which is attached to a printing roller, extends out of an arc-shaped groove, and the arc-shaped groove is used for enabling the lower scraper to be attached to the roller surface of the printing roller, so that before the arc-shaped groove is attached to the roller surface of the printing roller, the lower scraper is attached to the roller surface of the printing roller; the roller surface of the printing roller firstly abuts against and is attached to the lower scraper; when the arc-shaped groove is attached to the roller surface of the printing roller, the lower scraper abuts against and is attached to the roller surface of the printing roller through structural deformation. It needs to be explained that deformation of the lower scraper is within the self-recovery range, through the arrangement, the attaching acting force between the lower scraper and the printing roller is enhanced, the situation that when the printing roller rotates, the pressure at the bottom of the containing cavity is suddenly increased, then ink glue overflows from the position of the lower scraper, and leakage waste is caused is avoided, and meanwhile the printing roller is prevented from being damaged. The problem that the ink glue cannot be volatilized to the external environment and threats to the health of a human body can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to printing technical field, concretely relates to a closed type ink scraping device. BACKGROUND

[0002] The ink scraping knife is the "measuring scale" of the roller printing machine. The roller surface of the printing roller carries excess paste after taking ink, and if the excess paste is not scraped, the ink layer will be too thick during transfer printing, the pattern will be blurred, the color will be dirty, and even ink will drip and splash. The ink scraping knife runs against the roller surface of the printing roller with constant pressure, accurately scrapes the excess ink on the roller surface of the printing roller, and only leaves a fixed amount of ink layer, thereby ensuring clear graphics and consistent color; the scraped ink flows back and circulates, saves paste, maintains process stability, and is a key link for realizing high-quality, high-efficiency, and low-cost printing.

[0003] The existing ink scraping device is provided with a scraping knife seat and two scraping knives which are mutually attached to the roller surface of the printing roller. The two scraping knives are arranged at the upper and lower ends of the scraping knife seat. By adjusting the angle of the scraping knives, when the scraping knife seat is attached to the printing roller, the two scraping knives are also attached to the surface of the printing roller. At this time, the scraping knife seat, the two scraping knives, and the printing roller form a sealed cavity together. By pouring ink glue into the sealed cavity, and then rotating the printing roller, the ink glue can be coated on the printing roller, and the upper scraping knife can also scrape the ink on the roller surface of the printing roller.

[0004] However, it is worth noting that when the ink glue is continuously injected into the sealed cavity formed by the scraping knife seat, the two scraping knives, and the printing roller, the liquid level rises rapidly and fills the entire gap. Once the printing roller is started, the surface of the printing roller shears the ink glue at a high speed, the kinetic energy is converted into static pressure, and the centrifugal extrusion effect of the printing roller on the ink glue is added, which causes the pressure at the bottom of the sealed cavity to increase suddenly, and then causes the ink glue to overflow from the position of the lower scraping knife, resulting in dripping and waste. At the same time, the ink glue that drips out of the device will pose a serious threat to human health due to volatilization. CONTENT OF THE UTILITY MODEL

[0005] To solve the problem that when the printing roller starts to rotate, the pressure at the bottom of the sealed cavity increases suddenly, causing the ink glue to overflow from the position of the lower scraping knife, resulting in dripping and waste, and the problem that the ink glue that drips out of the device will pose a serious threat to human health due to volatilization, the utility model provides a closed type ink scraping device.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] The utility model provides a closed type ink scraping device, including frame and scraper seat, the scraper seat sets up on the frame, the scraper seat is opened with the accommodation cavity, the both ends of scraper seat are opened with the arc recess for the roll surface of printing roller is pasted, the arc recess and the accommodation cavity intercommunication, still include upper scraper and lower scraper, upper scraper and lower scraper set up in the top and bottom of scraper seat respectively, lower scraper is arranged obliquely, and the end of lower scraper is pasted with printing roller extends out the arc recess, and lower scraper realizes its with the roll surface of printing roller and resists and pastes through the deformation.

[0008] As a preferred technical scheme of the utility model, two flexible blocks are further included, the two flexible blocks are respectively arranged on the two sides of the accommodation cavity, the flexible block is provided with a circular arc, the curvature of the circular arc is the same as the curvature of the arc recess, the end surface of the circular arc is 1.5mm higher than the end surface of the arc recess, and the end of the lower scraper pasted with the printing roller extends out the end surface of the circular arc.

[0009] As a preferred technical scheme of the utility model, two limiting blocks are further included, the two limiting blocks are respectively and symmetrically arranged on the two sides of the accommodation cavity, the surface of the limiting block is provided with a circular arc, the curvature of the surface of the limiting block is the same as the curvature of the arc recess, and the surface of the limiting block and the surface of the arc recess are on the same circular surface, the bottom surface of the limiting block and the surface of the lower scraper are arranged in parallel to each other, and the lower scraper can lock or release the abutting relationship with the limiting block.

[0010] As a preferred technical scheme of the utility model, the top end of the limiting block is arranged obliquely towards the middle of the accommodation cavity.

[0011] As a preferred technical scheme of the utility model, the scraper seat is further provided with an inlet and outlet and a circulating port, the inlet and outlet and the circulating port are communicated with the accommodation cavity, and the height of the inlet and outlet is higher than the height of the circulating port.

[0012] As a preferred technical scheme of the utility model, a rotating unit and a connecting block are further included, the rotating unit includes a rotating rod, a driving cylinder and a driving ring, the rotating rod is arranged horizontally on the frame, the two ends of the connecting block are connected with the rotating rod and the scraper seat respectively, the driving ring is coaxially arranged on the rotating rod, the driving cylinder is vertically arranged on the frame, the output end of the driving cylinder is hingedly arranged with one end of the driving ring through a universal joint, and the output end of the driving cylinder controls the rotation of the driving ring through telescopic control.

[0013] As a preferred technical scheme of the utility model, the cavity part between the lower scraper and the circulation port is arc structure, when the scraper seat is removed from the adhering setting with the printing roller, the circulation port is located at the lowest position of the arc structure.

[0014] As a preferred technical scheme of the utility model, the mobile unit includes a mobile cylinder, a mobile guide rail and a mobile block, the mobile guide rail is arranged on the connecting block, the mobile block is slidably arranged on the mobile guide rail, the mobile block is connected with the scraper seat, and the mobile cylinder is carried on the connecting block.

[0015] As a preferred technical scheme of the utility model, the scraper seat includes a scraper main body, a hinge block and a hinge plate, the hinge block is connected with the scraper main body, the hinge block is hingedly arranged with the middle end of the hinge plate, the hinge between the hinge block and the hinge plate extends from the end face of the scraper main body by a certain interval, the upper scraper is arranged on the top of the hinge block, and the two end side wall faces of the hinge block are respectively abutted and adhered with the two side wall faces of the scraper main body.

[0016] The adjusting cylinder is further included, one end of the adjusting cylinder is hingedly arranged with the scraper main body, and the output end of the adjusting cylinder is hingedly arranged with the bottom of the hinge plate, and the end face of the hinge plate can be locked or the abutting and adhering relationship with the end face of the scraper main body is removed.

[0017] As a preferred technical scheme of the utility model, the hinge plate includes a hinge main plate, a mounting plate, a mounting guide rail and a mounting block, the middle end of the hinge main plate is hingedly arranged with the hinge block, the mounting guide rail is arranged on the hinge main plate, the mounting block is slidably arranged on the hinge main plate, the mounting plate is connected with the mounting block, the upper scraper is connected with the mounting block, the width of the mounting plate is equal to the width of the hinge main plate, and the two end side wall faces of the hinge main plate are respectively abutted and adhered with the two side faces of the scraper main body.

[0018] The manual fine adjustment assembly further includes a threaded rod, a threaded plate and a hand screw nut, the hand screw nut is coaxially arranged on the threaded rod, the threaded plate is arranged on the hinge main plate, the threaded plate is provided with a threaded groove, the threaded rod is threadedly connected with the threaded groove, one end of the threaded rod is connected with the mounting plate, and the sliding of the mounting plate is controlled.

[0019] The utility model discloses the beneficial effect is:

[0020] The arc-shaped groove is arranged to be matched with the roller surface of the printing roller, so that the roller surface of the printing roller is matched with the lower doctor blade before the arc-shaped groove is matched with the roller surface of the printing roller, the lower doctor blade is matched with the roller surface of the printing roller by structural deformation when the arc-shaped groove is matched with the roller surface of the printing roller, and the deformation of the lower doctor blade is within a self-recovery range. By such an arrangement, the matching force between the lower doctor blade and the printing roller is strengthened, the pressure at the bottom of the cavity is prevented from suddenly increasing when the printing roller rotates, and the ink and glue overflow from the position of the lower doctor blade, thereby avoiding waste caused by dripping, and the ink and glue cannot be volatilized to the external environment, thereby avoiding the problem of threatening the health of human bodies. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to facilitate the understanding of those skilled in the art, the present application will be further described below with reference to the drawings.

[0022] Figure 1 It is a whole view of the closed ink scraping device.

[0023] Figure 2 It is a whole view of the doctor blade seat of the closed ink scraping device.

[0024] Figure 3 It is a side view of the closed ink scraping device.

[0025] Figure 4 It is an enlarged view of A of the present application. Figure 3

[0026] Figure 5 It is a parts matching view of the rotating unit of the closed ink scraping device.

[0027] Figure 6 It is a parts matching view of the moving unit of the closed ink scraping device.

[0028] Figure 7 It is a side view of the moving unit of the closed ink scraping device.

[0029] Figure 8 It is a rear oblique view of the doctor blade seat of the closed ink scraping device.

[0030] Figure 9 It is a matching view of the manual fine adjustment assembly of the closed ink scraping device.

[0031] MAIN SYMBOL DESCRIPTION

[0032] ​In the figure: 1, rack; 2, scraper seat; 201, cavity; 202, arc-shaped groove; 3, upper scraper; 4, lower scraper; 5, flexible block; 501, circular arc; 6, limiting block; 7, rotating unit; 701, rotating rod; 702, driving cylinder; 703, driving ring; 8, connecting block; 9, moving unit; 901, moving cylinder; 902, moving guide rail; 903, moving block; 10, scraper main body; 11, hinged block; 12, adjusting cylinder; 13, hinged main body plate; 14, mounting plate; 15, mounting guide rail; 16, mounting block; 17, manual fine adjustment assembly; 1701, threaded rod; 1702, threaded plate; 1703, hand screw cap. DETAILED DESCRIPTION

[0033] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the utility model are described in detail as follows in combination with the drawings and preferred embodiments.

[0034] Please refer to Figures 1-9 The embodiment provides a closed ink scraping device, which comprises a rack 1 and a scraper seat 2, the scraper seat 2 is arranged on the rack 1, the scraper seat 2 is provided with a cavity 201, and the two ends of the scraper seat 2 are respectively provided with arc-shaped grooves 202 used for abutting with the outer circumferential surface of a printing roller; the arc-shaped grooves 202 are in communication with the cavity 201; the closed ink scraping device further comprises an upper scraper 3 and a lower scraper 4, the upper scraper 3 and the lower scraper 4 are arranged on the top and bottom of the scraper seat 2 respectively, the lower scraper 4 is arranged obliquely, one end of the lower scraper 4 abutting with the printing roller extends out of the arc-shaped groove 202, and the lower scraper 4 is abutted with the roller surface of the printing roller by structural deformation; when the one end of the lower scraper 4 abutting with the printing roller extends out of the arc-shaped groove 202, the roller surface of the printing roller has been abutted with the lower scraper 4 before the arc-shaped groove 202 abuts with the roller surface of the printing roller; when the arc-shaped groove 202 abuts with the roller surface of the printing roller, the lower scraper 4 is abutted with the roller surface of the printing roller by structural deformation; it should be noted that the deformation of the lower scraper 4 is within the range of self-recovery, the abutting force between the lower scraper 4 and the printing roller is strengthened by the arrangement, the situation that the oil ink and glue overflow from the position of the lower scraper 4 and cause dripping and waste is avoided when the printing roller rotates, the problem that the oil ink and glue overflow from the position of the lower scraper 4 and cause dripping and waste is caused by the fact that the surface of the printing roller is sheared in the circumferential direction to drive the oil ink and glue to circulate at high speed, kinetic energy is converted into static pressure, and the centrifugal extrusion effect of the printing roller on the oil ink and glue is added, and the bottom pressure of the sealing cavity is suddenly increased, and the problem that the oil ink and glue cannot volatilize to the external environment and cause a threat to human health is solved.

[0035] In addition, in order to avoid the ink glue from overflowing from both sides of the container cavity 201, the scheme also includes two flexible blocks 5, which are respectively attached to both sides of the container cavity 201. The flexible block 5 is provided with a circular arc 501, the curvature of the circular arc 501 is the same as that of the arc-shaped groove 202, and the end surface of the circular arc 501 is 1.5mm higher than that of the arc-shaped groove 202. The end of the lower scraper 4 extending out of the end surface of the circular arc 501 is attached to the printing roller. Through such a design, when the printing roller is attached to the arc-shaped groove 202, the printing roller has completed the pressing process of the flexible block 5, further increasing the sealing capacity of both sides of the container cavity 201, ensuring that the ink glue in the container cavity 201 cannot overflow from both sides of the container cavity 201. Combined with the design of the lower scraper 4 described above, the final structure effect of the ink glue cannot overflow from the container cavity 201 is achieved.

[0036] Further, in order to prevent the end of the lower scraper 4 from deforming too much when it is attached to the printing roller, the scheme also includes two limiting blocks 6, which are respectively and symmetrically arranged on both sides of the container cavity 201. The surface of the limiting block 6 is provided with a circular arc 501, the curvature of the surface of the limiting block 6 is the same as that of the arc-shaped groove 202, and the surface of the limiting block 6 and the surface of the arc-shaped groove 202 are on the same circular arc 501. The bottom surface of the limiting block 6 is arranged parallel to the surface of the lower scraper 4, and the lower scraper 4 can lock or release the abutting relationship with the limiting block 6. It should be noted that the bottom surface of the limiting block 6 can lock or release the abutting relationship with the lower scraper 4. When the printing roller is attached to the arc-shaped groove 202, the lower scraper 4 deforms to make the bottom surface of the limiting block 6 abut the lower scraper 4, thereby limiting the degree of deformation of the lower scraper 4. In addition, since the end surface of the limiting block 6 and the end surface of the flexible block 5 are in abutting position, and the other end surface of the flexible block 5 abuts the inner side wall of the scraper seat 2, such arrangement makes the ink glue pressure in the container cavity 201 unable to directly act on the flexible block 5 when the printing roller is attached to the arc-shaped groove 202, avoiding the flexible block 5 from deforming irreversibly due to the impact of the ink glue pressure, and further improving the service life of the flexible block 5.

[0037] In addition, the top end of the limiting block 6 is inclined towards the middle of the container cavity 201. Through such a design, as the printing roller rotates, the ink glue in the container cavity 201 will have a tendency to flow towards the middle of the container cavity 201 when passing through the top of the limiting block 6, thereby weakening the kinetic energy of the ink glue flowing outward and blocking the path of the ink glue overflowing, significantly reducing the risk of dripping.

[0038] Further, the scraper seat 2 is further provided with an inlet and outlet port and a circulation port, both of which are communicated with the cavity 201, the inlet and outlet port can be externally connected with a feeding mechanism and a discharging mechanism, and the ink and glue in the cavity 201 can be fed and discharged through the inlet and outlet port; the circulation port can be externally connected with a circulating pump, and the ink and glue in the cavity 201 can flow through the circulation port. The ink and glue can enter the cavity 201 through the inlet and outlet port, and then the ink and glue in the cavity 201 can also move out of the cavity 201 through the inlet and outlet port; it should be noted that when the scraper seat 2 and the printing roller are mutually attached, the height of the inlet and outlet port is higher than that of the circulation port, and such arrangement can facilitate reducing the pressure of the ink and glue between the upper scraper 3 and the printing roller.

[0039] At the same time, it should be emphasized that in order to ensure that the ink and glue in the cavity 201 can be completely removed out of the cavity 201 through the circulation port after the device ends work, the present scheme further comprises a rotating unit 7 and a connecting block 8, the rotating unit 7 comprises a rotating rod 701, a driving cylinder 702 and a driving ring 703, the rotating rod 701 is transversely arranged on the rack 1, the two ends of the connecting block 8 are respectively connected with the rotating rod 701 and the scraper seat 2, the driving ring 703 is coaxially arranged on the rotating rod 701, the driving cylinder 702 is vertically arranged on the rack 1, the output end of the driving cylinder 702 is hingedly arranged with one end of the driving ring 703 through a universal joint, and the output end of the driving cylinder 702 drives the rotation of the driving ring 703 through extension and contraction; by arranging the rotating unit 7, the rotation of the driving ring 703 can be controlled with the extension and contraction of the output end of the driving cylinder 702, thereby driving the rotation of the rotating rod 701, and finally realizing the rotation of the scraper seat 2; it should be noted that the rotating unit 7 can control the scraper seat 2 to change from the vertical state during work to the horizontal state during non-work, and when in the horizontal state, the scraper seat 2 is removed from the attached arrangement with the printing roller, and the cavity 201 between the lower scraper 4 and the circulation port is defined as an arc structure, and the circulation port is located at the lowest position of the arc structure; therefore, by controlling the rotation of the scraper seat 2, the ink and glue in the cavity 201 can be completely removed out of the cavity 201 through the circulation port.

[0040] According to the above embodiment, when the scraper seat 2 is attached to the printing roller, the lower scraper 4 will be in abutting pressing cooperation with the printing roller. Therefore, in order to smoothly achieve this effect, the scraper seat 2 needs to be translated to approach the printing roller until the scraper seat 2 and the printing roller are attached to each other. Based on this, the present scheme further comprises a moving unit 9, the moving unit 9 comprises a moving cylinder 901, a moving guide rail 902 and a moving block 903, the moving guide rail 902 is arranged on the connecting block 8, the moving block 903 is slidably arranged on the moving guide rail 902, the moving block 903 is connected with the scraper seat 2, the moving cylinder 901 is carried on the connecting block 8, and the output end of the moving cylinder 901 is connected with the scraper seat 2; by being provided with the moving unit 9, when the rotating unit 7 drives the scraper seat 2 to rotate to a specified angle, the moving cylinder 901 starts to work, controls the scraper seat 2 to start to translate, and until the scraper seat 2 is attached to the printing roller.

[0041] It should be noted that when the scraper seat 2 is attached to the printing roller, the lower scraper 4 will be in abutting pressing cooperation with the printing roller, but at this time it does not mean that the ink scraping effect of the upper scraper 3 on the printing roller has reached the best, therefore, the angle of the upper scraper 3 needs to be adjusted and processed, based on this, the scraper seat 2 of the present scheme comprises a scraper main body 10, a hinge block 11 and a hinge plate, the scraper main body 10 and the connecting block 8 are connected, the hinge block 11 is connected with the scraper main body 10, the hinge block 11 and the middle end of the hinge plate are hingedly arranged, the hinge between the hinge block 11 and the hinge plate is stretched from the end face of the scraper main body 10 by a certain interval, and the hinge between the hinge block 11 and the hinge plate is located at the bottom of the surface of the scraper main body 10, the upper scraper 3 is arranged on the top of the hinge block 11, and the two end side wall surfaces of the hinge block 11 are abuttingly attached to the two side wall surfaces of the scraper main body 10; it should be noted that the lower scraper 4 of the present scheme is connected with the scraper main body 10, and the flexible block 5 and the limiting block 6 are arranged on the side wall of the scraper main body 10, therefore, the side wall surface of the hinge block 11 is actually abuttingly attached to the flexible block 5; it should be noted that when the end face of the hinge plate and the end face of the scraper main body 10 are not attached, at this time the cavity 201 is in communication with the external environment, and a sealed space cannot be formed, only when the end face of the hinge plate and the end face of the scraper main body 10 are attached to each other, the scraper seat 2 in this state cooperates with the printing roller, and the sealed space of the cavity 201 can be realized. Therefore, the present scheme further comprises an adjusting cylinder 12, one end of the adjusting cylinder 12 is hingedly arranged with the scraper main body 10, and the output end of the adjusting cylinder 12 is hingedly arranged with the bottom of the hinge plate, the end face of the hinge plate can lock or release the abutting attachment relationship with the end face of the scraper main body 10; by being provided with the adjusting cylinder 12, the adjusting cylinder 12 is used to control the rotation of the hinge block 11, the end face of the hinge plate and the end face of the scraper main body 10 are attached to each other, so as to realize the sealed state of the cavity 201.

[0042] Further, the essence of splitting the scraper seat 2 into the scraper main body 10 and the hinged plate is to adjust the angle of the upper scraper 3 to achieve the best scraping effect on the printing roller. However, the angle adjustment of the upper scraper 3 interferes with the adjustment of the end face of the hinged plate and the end face of the scraper main body 10. Therefore, in order to solve this problem, the upper scraper 3 also needs to have a structure effect of sliding relative to the hinged plate. Based on this, the hinged plate includes a hinged main plate 13, a mounting plate 14, a mounting guide rail 15 and a mounting block 16. The middle end of the hinged main plate 13 is hingedly arranged with the hinged block 11. The mounting guide rail 15 is arranged on the hinged main plate 13. The end face of the hinged main plate 13 can be locked or unlocked with the end face of the scraper main body 10. The mounting block 16 is slidingly arranged on the hinged main plate 13. The mounting plate 14 is connected with the mounting block 16. The upper scraper 3 is arranged on the top of the mounting block 16. The width of the mounting plate 14 is equal to the width of the hinged main plate 13. The two end side walls of the hinged main plate 13 are respectively abutted with the two side walls of the scraper main body 10. It should be noted that the lower scraper 4 of the present application is connected with the scraper main body 10. The flexible block 5 and the limiting block 6 are arranged on the side wall of the scraper main body 10. Therefore, the side wall of the hinged main plate 13 is actually abutted with the flexible block 5. It is also worth noting that the arrangement direction of the mounting guide rail 15 is perpendicular to the axis direction of the upper scraper 3, which is used to control the extension distance of the upper scraper 3.

[0043] At the same time, in order to realize the sliding of the mounting plate 14, the present application also includes a manual fine adjustment assembly 17. The manual fine adjustment assembly 17 includes a threaded rod 1701, a threaded plate 1702 and a hand screw cap 1703. The hand screw cap 1703 is coaxially arranged on the threaded rod 1701. The threaded plate 1702 is arranged on the hinged main plate 13. The threaded plate 1702 is provided with a threaded groove. The threaded rod 1701 is threadedly connected with the threaded groove. One end of the threaded rod 1701 is connected with the mounting plate 14 to control the sliding of the mounting plate 14. Through the cooperation of the adjusting cylinder 12 and the manual fine adjustment assembly 17, the end face of the hinged main plate 13 can be abutted with the end face of the scraper main body 10, and the upper scraper 3 can also achieve the best scraping effect on the printing roller.

[0044] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the technical solution range of the present application to obtain equivalent embodiments with equivalent changes. Any modification, equivalent change and modification of the above embodiments based on the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A closed type ink scraping device, comprising a frame and a scraper seat, the scraper seat is arranged on the frame, the scraper seat is provided with a cavity, and two ends of the scraper seat are respectively provided with arc-shaped grooves used for abutting with the surface of a printing roller, the arc-shaped grooves and the cavity are in communication with each other, characterized in that: The upper scraper and the lower scraper are arranged at the top and bottom of the scraper seat respectively, the lower scraper is arranged obliquely, and the end of the lower scraper extending out of the arc-shaped groove is in abutting contact with the printing roller.

2. A closed ink scraping device according to claim 1, characterized in that: Two flexible blocks are arranged on the two sides of the cavity respectively, the flexible blocks are provided with a circular arc, the curvature of the circular arc is the same as that of the arc-shaped groove, the end surface of the circular arc is 1.5 mm higher than that of the arc-shaped groove, and the end of the lower scraper extending out of the end surface of the circular arc is in abutting contact with the printing roller.

3. The closed ink scraping device of claim 1, wherein: Two limiting blocks are symmetrically arranged on the two sides of the cavity, the surface of the limiting block is provided with a circular arc, the curvature of the surface of the limiting block is the same as that of the arc-shaped groove, the surface of the limiting block and the surface of the arc-shaped groove are on the same circular surface, the bottom surface of the limiting block is arranged in parallel with the surface of the lower scraper, and the lower scraper can be locked or unlocked in abutting contact with the limiting block.

4. The closed ink scraping device of claim 3, wherein: The top end of the limiting block is arranged obliquely towards the middle of the cavity.

5. The closed ink scraping device of claim 1, wherein: The scraper seat is provided with an inlet and outlet port and a circulating port, the inlet and outlet port and the circulating port are communicated with the cavity, and the height of the inlet and outlet port is higher than that of the circulating port.

6. The closed ink scraping device of claim 1, wherein: The rotating unit includes a rotating rod, a driving cylinder and a driving ring, the rotating rod is arranged transversely on the rack, the two ends of the connecting block are connected with the rotating rod and the scraper seat respectively, the driving ring is coaxially arranged on the rotating rod, the driving cylinder is vertically arranged on the rack, the output end of the driving cylinder is hingedly connected with one end of the driving ring through a universal joint, and the output end of the driving cylinder controls the rotation of the driving ring through stretching and contraction.

7. The closed ink scraping device of claim 5, wherein: The cavity between the lower scraper and the circulating port is in an arc-shaped structure, and when the scraper seat is unlocked from the abutting contact with the printing roller, the circulating port is located at the lowest position of the arc-shaped structure.

8. The closed ink scraping device of claim 6, wherein: The moving unit includes a moving cylinder, a moving guide rail and a moving block, the moving guide rail is arranged on the connecting block, the moving block is slidably arranged on the moving guide rail, the moving block is connected with the scraper seat, and the moving cylinder is mounted on the connecting block.

9. The closed ink scraping device of claim 6, wherein: The scraper seat includes a scraper main body, a hinged block and a hinged plate, the scraper main body and the connecting block are connected, the hinged block is connected with the scraper main body, the hinged block is hingedly connected with the middle end of the hinged plate, the hinge between the hinged block and the hinged plate extends out of the end surface of the scraper main body by a certain distance, the upper scraper is arranged at the top of the hinged block, and the two end side walls of the hinged block are in abutting contact with the two side walls of the scraper main body respectively. The adjusting cylinder is hingedly arranged at one end of the scraper main body, and the output end of the adjusting cylinder is hingedly arranged at the bottom of the hinged plate.

10. The closed doctor device of claim 9, wherein: The hinged plate comprises a hinged main plate, a mounting plate, a mounting guide rail and a mounting block, the middle end of the hinged main plate is hingedly arranged with the hinged block, the mounting guide rail is arranged on the hinged main plate, the mounting block is slidingly arranged on the hinged main plate, the mounting plate is connected with the mounting block, the upper scraper is connected with the mounting block, the width of the mounting plate is equal to the width of the hinged main plate, and the two end side wall surfaces of the hinged main plate are respectively abutted and fitted with the two side surfaces of the scraper main body; The manual fine adjustment assembly comprises a threaded rod, a threaded plate and a hand screw nut, the hand screw nut is coaxially arranged on the threaded rod, the threaded plate is arranged on the hinged main plate, the threaded plate is provided with a threaded groove, the threaded rod is threadedly connected with the threaded groove, one end of the threaded rod is connected with the mounting plate, and the sliding of the mounting plate is controlled.

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