Gravure printing adjustable angle and quick tool change doctor blade system

Abstract

The present invention provides a doctor blade system for gravure printing with adjustable angle and quick blade change, which relates to the field of printing technology and comprises a doctor blade quick change mechanism and an angle adjustment mechanism; the doctor blade quick change mechanism comprises a mounting seat (1), a pressure plate (2), a doctor blade seat (4) and a doctor blade (3), and the angle adjustment mechanism comprises a connecting seat (5), an arc-shaped rack (6) and an adjustment rod (7); the top end of the arc-shaped rack (6) in the angle adjustment mechanism is fixedly mounted on the bottom end of the mounting seat (1) of the doctor blade quick change mechanism, so that the two mechanisms are connected as one; the present invention can adjust the angle of the doctor blade and the blade distance between the doctor blade and the gravure plate, can quickly meet different printing requirements, not only effectively improves the printing quality, but also speeds up the printing speed; at the same time, when the doctor blade needs to be replaced, the doctor blade and the doctor blade seat are replaced together as a component, which has a fast replacement speed, a simple structure and high reliability.

Description

Technical Field

[0001] The invention relates to the technical field of printing, and in particular to an ink scraping system for gravure printing capable of adjusting angles and quickly changing blades. Background Art

[0002] The gravure printing machine is the most important printing equipment in printing enterprises. It refers to a printing method in which the text and images are lower than the surface of the printing plate. The principle is to immerse the printing plate roller in the ink tank. After the plate roller rotates up, the scraper scrapes off the excess ink on the part of the printing plate surface above the text and image. Then, the paper is pressed against the printing plate roller through the impression roller, so that the ink on the recessed image is transferred to the paper, thus completing the printing.

[0003] The doctor blade is a device that scrapes off excess ink on the printing plate during the gravure printing process. It is one of the necessary components of the gravure printing machine, and its working condition has a great impact on the quality of gravure printing.

[0004] First of all, when the gravure printing machine is printing, the angle of the scraper is a very important parameter. The scraper angle refers to the contact angle between the scraper and the plate roller, that is, the angle between the tangent line of the contact point. In the actual printing production process, it is necessary to comprehensively consider factors such as ink viscosity and gravure product pattern to determine the angle of the scraper. The angle adjustment process is often long, and the angle adjustment is more prone to errors. Moreover, during the printing process, the adjusted scraper angle is prone to angle deviation, ink displacement, and increased ink volume due to long-term movement and friction between the gravure plate and the scraper, resulting in uneven coloring, seriously restricting printing quality and printing efficiency, and bringing many inconveniences to actual production. Therefore, whether the adjustment and correction of the scraper angle can be completed quickly is crucial to the quality and output of printing.

[0005] In addition, since the scraper blade is in contact with the high-speed rotating workpiece for a long time, it wears out quickly and needs to be replaced frequently. The existing scraper blade fixing device fixes the scraper blade by combining a pressure plate with a knife holder. When replacing the blade, it is necessary to disassemble the pressure plate and the knife holder in turn, and then disassemble the knife holder and the blade. After replacing the blade, it is necessary to reassemble them. The replacement steps are numerous and the speed is slow, which leads to discontinuous production and reduces production efficiency. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing technology, the present invention provides a doctor blade system with adjustable angle and quick blade change for gravure printing. The system can quickly adjust the angle of the doctor blade according to printing needs and changes, and fix the blade holder and the doctor blade as a whole in advance, so that they can be installed or replaced as a whole. At the same time, the fixing structure of the blade holder and the pressure plate is optimized, and the pressure plate is fixed and loosened by using elastic pressure, so as to realize quick replacement of the doctor blade assembly.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The gravure printing doctor blade system has adjustable angles and quick blade changes, and is installed overhead on the printing unit wall panels at both ends of the gravure plate. It is characterized in that it includes a doctor blade quick-change mechanism and an angle adjustment mechanism, and the doctor blade quick-change mechanism is installed above the angle adjustment mechanism.

[0009] The scraper blade quick-change mechanism includes a mounting seat 1, a pressure plate 2, a scraper blade seat 4 and a scraper blade 3, and the angle adjustment mechanism includes a connecting seat 5, an arc-shaped rack 6 and an adjustment rod 7; the top end of the arc-shaped rack 6 in the angle adjustment mechanism is fixedly mounted on the bottom of the mounting seat 1 of the scraper blade quick-change mechanism, so that the two mechanisms are connected as one.

[0010] The scraper blade 3 and the scraper seat 4 in the scraper quick-change mechanism constitute a scraper assembly, and the pressure plate 2 and the mounting seat 1 form a lever structure; the scraper blade 3 is in the shape of a long rectangle, with the blade edge facing outward, and the blade body is clamped in the front end of the scraper seat 4 in a direction parallel to the blade edge, and a fastening screw 8 is provided in the middle and rear section of the scraper seat 4 to lock the scraper blade 3 and the scraper seat 4 to each other; in addition, in the lever structure composed of the pressure plate 2 and the mounting seat 1, the scraper assembly is clamped at the front end opening of the lever structure, and the rotating shaft 9 connecting the two is located in the middle and rear position, and the pressure plate 2 and the mounting seat 1 are relatively close along the rotating shaft 9. Rotation; and at the rear of the ink scraping assembly and in front of the rotating shaft 9, relative blind holes 10 are respectively opened at the relative positions of the inner sides of the pressure plate 2 and the mounting seat 1 for installing and fixing the spring 11. During normal operation, the spring 11 is in a stretched state, generating a pulling force on the pressure plate 2 and the mounting seat 1, so that the front ends of the two are fitted together; behind the rotating shaft 9, a lifting mechanism 12 is provided which can simultaneously apply a force to the same end of the lever structure composed of the pressure plate 2 and the mounting seat 1, and simultaneously apply a force to the pressure plate 2 and the mounting seat 1 behind the rotating shaft 9, so that the rear ends of the two are opened and the front ends are merged, thereby clamping the ink scraping assembly.

[0011] There are two arc-shaped racks 6 in the angle adjustment mechanism, which are respectively fixedly connected to the bottom surface of the mounting seat 1, and their arc-shaped convex surfaces face the ink tank of the gravure printing machine. The two arc-shaped racks 6 are respectively provided with arc-shaped sleeves 13. The arc-shaped racks 6 slide in their respective corresponding arc-shaped sleeves 13, and the upward sliding limit of the arc-shaped racks 6 is less than the length of the arc-shaped sleeves 13; the lower end surface of the arc-shaped sleeve 13 is fixed to the wall panel of the gravure printing machine by bolts, and the two arc-shaped sleeves 13 are connected by a reinforcing rod 14; the adjusting rod 7 is a cylindrical structure, which is installed on the outer side of the upper end of the arc-shaped rack 6 and is parallel to the reinforcing rod 14 between the two arc-shaped sleeves 13. The adjusting rod 7 is parallel to the two arc-shaped racks. 6 are respectively covered with cylindrical gears 15, and the two cylindrical gears 15 are respectively engaged with the teeth on the two arc-shaped racks 6; either end of the adjusting rod 7 is a locking end, and the other end is an adjusting end; the locking end is movably connected to the connecting seat 5 through a bearing, and a thread is provided on the end extending outward from the connecting seat 5, and a locking nut 16 is provided; the end of the connecting seat 5 is fixedly mounted on the wall panel of the gravure printing machine; the adjusting end is connected to the second adjusting mechanism, which can rotate the entire adjusting rod 7, and drive the arc-shaped rack 6 to slide in the arc-shaped housing 13 through the gear, thereby driving the ink scraper quick-change mechanism as a whole to rotate around the gravure plate to achieve angle adjustment of the scraper.

[0012] Preferably, the second adjustment mechanism is a manual rotating wheel 17 , which is directly and rigidly connected to the locking end of the adjustment rod 7 .

[0013] Preferably, the second adjustment mechanism is an automatic adjustment device including a numerical input terminal, a signal converter and an electric actuator, wherein the locking end of the adjustment rod 7 is directly rigidly connected to the output shaft of the electric actuator, the signal converter is connected to the electric actuator through a signal line, and the numerical input terminal is connected to the signal converter through a signal line.

[0014] Preferably, a quick-rotating engaging structure is provided at the end of the joint surface between the ink scraping assembly and the lever structure.

[0015] Preferably, the fast rotating engaging structure includes a cylindrical connecting piece 18 fixed to the rear end surface of the ink scraper seat 4, and an arc-shaped guide groove 19 respectively provided on the lower surface of the pressure plate 2 and the upper surface of the mounting seat 1, which cooperates with the cylindrical connecting piece 18; the end of the cylindrical connecting piece 18 is provided with an eccentric clamping wheel 20 with a diameter larger than the main body of the cylindrical connecting piece 18, and at the end of the arc-shaped guide groove 19, a space with the same shape as the eccentric clamping wheel 20 and a volume larger than the eccentric clamping wheel 20 is provided, which is composed of two opposite grooves respectively provided on the lower surface of the pressure plate 2 and the upper surface of the mounting seat 1, and is recessed on the mounting seat 1. A circular shaft is set at the bottom of the groove, and a conical clamping block 21 is set at the end of the circular shaft; the eccentric clamping wheel 20 is a hollow cylindrical component with an open end face. An arc-shaped clamping groove 201 is provided on the side wall, extending from the end face opening to the bottom face. The arc of the arc-shaped clamping groove 201 near the bottom face is greater than the arc of the upper end, forming a reverse steep slope structure 202 greater than 90°; the width of the arc-shaped clamping groove 201 is greater than the diameter of the bottom of the conical clamping block 21 and smaller than the diameter of the top of the conical clamping block 21. The conical clamping block 21 is clamped into the arc-shaped clamping groove 201 from its opening and clamped in the reverse steep slope structure 202 at its bottom to form a stable connection structure.

[0016] Preferably, an angle measurer 22 is installed above the connecting base 5, and the angle measurer 22 is connected to the connecting base 5 through a connecting rod with adjustable height. The connecting rod adjusts the height of the angle measurer 22 to facilitate the operator to select different lines and their endpoints on the scraper quick-change mechanism as reference lines and zero points to align with the zero-degree line and point on the angle measurer 22, thereby facilitating observation and measurement.

[0017] Preferably, the lifting mechanism 12 is a pneumatic strut or an airbag.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can quickly adjust the angle of the scraper according to different ink viscosities and gravure product patterns by arranging a mounting seat, a feed mechanism and an angle adjustment mechanism. Even if the angle of the scraper deviates during printing, the angle of the scraper and the distance between the scraper and the gravure plate can be adjusted without stopping the machine, so as to quickly meet different printing requirements, effectively improving the printing quality and speeding up the printing speed. At the same time, when the scraper needs to be replaced, the scraper and the scraper seat can be used as a component. The ink scraper assembly is replaced with a new one that has been debugged and installed, and then the work can be continued; then the replaced ink scraper is taken out of the ink scraper holder and replaced with a new blade to become a new ink scraper assembly; this structure can quickly and timely replace a damaged ink scraper, shorten the time and improve the installation accuracy; the ink scraper assembly composed of the ink scraper and the ink scraper holder and the mounting seat are quickly engaged and released through the eccentric clamping wheel and the conical clamping block, and the engaging strength and firmness are high; the pressure plate and the mounting seat form a lever structure through the air bag, the rotating shaft, etc., which has a simple structure and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the ink scraping system with adjustable angle and quick blade change for gravure printing described in Example 1.

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure after rotating 180°.

[0021] Figure 3 It is a working schematic diagram of the gravure printing scraper system with adjustable angle and quick blade change.

[0022] Figure 4 It is a structural schematic diagram of the ink scraper quick-change mechanism.

[0023] Figure 5 It is a working diagram of the scraper quick-change mechanism.

[0024] Figure 6 yes Figure 4 3D structural diagram.

[0025] Figure 7 It is a diagram of the internal structure of the scraper quick-change mechanism.

[0026] Figure 8 This is a schematic diagram of the action of the ink scraping assembly when the old knife is withdrawn.

[0027] Figure 9 This is a schematic diagram of the action of the ink scraping assembly when a new blade is installed.

[0028] Figure 10This is a schematic diagram of the clamping action of the eccentric clamping wheel and the conical clamping block after the new knife is installed.

[0029] Figure 11 It is a schematic diagram of the combination of an eccentric clamping wheel and a conical clamping block.

[0030] Figure 12 It is a structural diagram of an eccentric clamping wheel.

[0031] Figure 13 This is the expanded structure diagram of the eccentric clamping wheel.

[0032] In the figure: mounting base 1, pressure plate 2, doctor blade 3, doctor blade base 4, connecting base 5, arc-shaped rack 6, adjusting rod 7, fastening screw 8, rotating shaft 9, blind hole 10, spring 11, lifting mechanism 12, arc-shaped housing 13, reinforcing rod 14, cylindrical gear 15, locking nut 16, manual rotating wheel 17, cylindrical connecting piece 18, arc-shaped guide groove 19, eccentric clamping wheel 20, arc-shaped clamping groove 201, reverse steep slope structure 202, conical clamping block 21, angle measuring device 22. Implementation Method

[0033] The present invention will be further described below with reference to the accompanying drawings and examples. Example

[0034] See also Figure 1-5 The gravure printing scraper system with adjustable angle and quick blade change described in this embodiment is used to scrape ink from the raised parts of the gravure printing plate. It is installed as a whole on the printing unit wall panels at both ends of the gravure plate, and includes a scraper quick change mechanism and an angle adjustment mechanism. The scraper quick change mechanism is installed above the angle adjustment mechanism.

[0035] The scraper blade quick-change mechanism includes a mounting seat 1, a pressure plate 2, a scraper blade seat 4 and a scraper blade 3, and the angle adjustment mechanism includes a connecting seat 5, an arc-shaped rack 6 and an adjustment rod 7; the top end of the arc-shaped rack 6 in the angle adjustment mechanism is fixedly mounted on the bottom of the mounting seat 1 of the scraper blade quick-change mechanism, so that the two mechanisms are connected as one.

[0036] The scraper blade 3 and the scraper seat 4 in the scraper quick-change mechanism constitute a scraper assembly, and the pressure plate 2 and the mounting seat 1 form a lever structure; the scraper blade 3 is in the shape of a long rectangle, with the blade edge facing outward, and the blade body is clamped in the front end of the scraper seat 4 in a direction parallel to the blade edge, and a fastening screw 8 is provided in the middle and rear section of the scraper seat 4 to lock the scraper blade 3 and the scraper seat 4 to each other; in addition, in the lever structure composed of the pressure plate 2 and the mounting seat 1, the scraper assembly is clamped at the front end opening of the lever structure, and the rotating shaft 9 connecting the two is located in the middle and rear position, and the pressure plate 2 and the mounting seat 1 are connected along the rotating shaft 9 Relative rotation; and at the rear of the ink scraping assembly and in front of the rotating shaft 9, relative blind holes 10 are respectively opened at the relative positions of the inner sides of the pressure plate 2 and the mounting seat 1 for installing and fixing the spring 11. During normal operation, the spring 11 is in a stretched state, generating a pulling force on the pressure plate 2 and the mounting seat 1, so that the front ends of the two are fitted together; behind the rotating shaft 9, an air bag is provided which can simultaneously apply a force to the same end of the lever structure composed of the pressure plate 2 and the mounting seat 1, and simultaneously apply a force to the pressure plate 2 and the mounting seat 1 behind the rotating shaft 9, so that the rear ends of the two are opened and the front ends are merged, thereby clamping the ink scraping assembly.

[0037] There are two arc-shaped racks 6 in the angle adjustment mechanism, which are respectively fixedly connected to the bottom surface of the mounting seat 1, and their arc-shaped convex surfaces face the ink tank of the gravure printing machine. The two arc-shaped racks 6 are respectively provided with arc-shaped sleeves 13. The arc-shaped racks 6 slide in their respective corresponding arc-shaped sleeves 13, and the upward sliding limit of the arc-shaped racks 6 is less than the length of the arc-shaped sleeves 13; the lower end surface of the arc-shaped sleeve 13 is fixed to the wall panel of the gravure printing machine by bolts, and the two arc-shaped sleeves 13 are connected by a reinforcing rod 14; the adjusting rod 7 is a cylindrical structure, which is installed on the outer side of the upper end of the arc-shaped rack 6 and is parallel to the reinforcing rod 14 between the two arc-shaped sleeves 13. It is parallel to the two arc-shaped racks 6. The contact positions are respectively covered with cylindrical gears 15, and the two cylindrical gears 15 are respectively engaged with the teeth on the two arc-shaped racks 6; either end of the adjusting rod 7 is a locking end, and the other end is an adjusting end; the locking end is movably connected to the connecting seat 5 through a bearing, and a thread is provided on the end extending outward from the connecting seat 5, and a locking nut 16 is provided; the end of the connecting seat 5 is fixedly mounted on the wall panel of the gravure printing machine; the adjusting end is connected to the manual rotating wheel 17, which can rotate the entire adjusting rod 7, and drive the arc-shaped rack 6 to slide in the arc-shaped housing 13 through the gear, thereby driving the ink scraper quick-change mechanism as a whole to rotate around the gravure plate to achieve angle adjustment of the scraper. Example

[0038] refer to Figure 6-13 ,as well as Figure 2 and Figure 3The angle adjustment mechanism of the gravure printing doctor blade system with adjustable angle and quick blade change described in this embodiment is basically the same as that described in the embodiment, with the difference that the second adjustment mechanism is an automatic adjustment device including a numerical input terminal, a signal converter and an electric actuator, wherein the locking end of the adjustment rod 7 is directly rigidly connected to the output shaft of the electric actuator, the signal converter is connected to the electric actuator through a signal line, and the numerical input terminal is connected to the signal converter through a signal line.

[0039] In the ink knife quick-change mechanism, a fast-rotating engaging structure is provided at the end of the joint surface between the ink scraper assembly and the lever structure, including a cylindrical connector 18 fixed to the rear end surface of the ink scraper seat 4, and an arc-shaped guide groove 19 respectively provided on the lower surface of the pressure plate 2 and the upper surface of the mounting seat 1, which cooperates with the cylindrical connector 18; an eccentric clamping wheel 20 with a diameter larger than the main body of the cylindrical connector 18 is provided at the end of the cylindrical connector 18, and a space with the same shape as the eccentric clamping wheel 20 and a volume larger than the eccentric clamping wheel 20 is provided at the end of the arc-shaped guide groove 19, which is respectively provided by two relative grooves provided on the lower surface of the pressure plate 2 and the upper surface of the mounting seat 1 The eccentric clamping wheel 20 is a hollow cylindrical member with an open end face and an arc-shaped clamping groove 201 extending from the end face opening to the bottom face on the side wall. The arc of the arc-shaped clamping groove 201 near the bottom face is greater than the outer side, forming a reverse steep slope structure 202 greater than 90°; the width of the arc-shaped clamping groove 201 is greater than the diameter of the bottom of the conical clamping block 21 and smaller than the diameter of the top of the conical clamping block 21. The conical clamping block 21 is clamped into the arc-shaped clamping groove 201 from its opening and clamped in the reverse steep slope structure 202 at its bottom to form a stable connection structure.

[0040] In addition, in this embodiment, an angle measurer 22 is installed above the connecting base 5. The angle measurer 22 is connected to the connecting base 5 via a connecting rod with adjustable height. The connecting rod adjusts the height of the angle measurer 22 to facilitate the operator to select different lines and their endpoints on the scraper quick-change mechanism as reference lines and zero points to align with the zero-degree line and point on the angle measurer 22, thereby facilitating observation and measurement.

[0041] refer to Figure 8-10When the quick blade changing device of this embodiment is in normal use, the screw 8 is tightened to clamp the ink scraping blade 3 in the ink scraping blade holder 4, and then it is installed and fixed on the mounting seat 1, and the lifting mechanism 12 lifts the pressure plate 2 so that its front end is clamped with the mounting seat 1; when the blade needs to be replaced, the lifting mechanism 12 is first lowered, the pressure plate 2 and the front end of the mounting seat 1 are opened, and the ink scraping blade holder 4 is rotated on the outside, so that the conical clamping block 21 slides out of the steep slope structure and exits its opening in the opposite direction along the arc-shaped clamping groove 201, and moves to the Pull out the ink scraper holder 4 and replace it with a new ink scraper assembly. Push the ink scraper holder 4 inward at an inclined angle along the arc-shaped guide groove 19 on the lower surface of the pressure plate 2 and the upper surface of the mounting seat 1. Engage the eccentric clamping wheel 20 at the end of the cylindrical connecting member 18 with the conical clamping block 21 and clamp it in the steep slope structure at its bottom, thereby locking the cylindrical connecting member 18 in the axial direction. Then, raise the lifting mechanism 12 to close the front end of the pressure plate 2 and the mounting seat 1 and clamp the ink scraper assembly, completing the blade change operation.

[0042] refer to Figure 3 When the angle needs to be adjusted, first rotate the adjusting rod 7. The cylindrical gear 15 on the adjusting rod 7 rotates and drives the arc rack 6 to fine-tune the rotation. The arc rack 6 synchronously drives the connecting seat 5 and the ink scraping assembly above it to rotate the angle, thereby completing the angle adjustment of the ink scraper. During the adjustment process, the inclination angle of the connecting seat 5 can be observed in real time through the angle measuring device 22. Because the ink scraping assembly is arranged parallel to the top of the connecting seat 5, the bevel angle of the connecting seat 5 is the inclination angle of the ink scraping assembly.

Claims

1. The doctor blade system for gravure printing can be adjusted in angle and quickly changed. It is installed overhead on the printing unit wall panels at both ends of the gravure printing plate. It is characterized by: It includes a scraper blade quick-change mechanism and an angle adjustment mechanism, wherein the scraper blade quick-change mechanism is installed above the angle adjustment mechanism; The ink scraper quick-change mechanism comprises a mounting seat (1), a pressure plate (2), an ink scraper seat (4) and an ink scraper blade (3), and the angle adjustment mechanism comprises a connecting seat (5), an arc-shaped rack (6) and an adjustment rod (7); the top end of the arc-shaped rack (6) in the angle adjustment mechanism is fixedly mounted on the bottom end of the mounting seat (1) of the ink scraper quick-change mechanism, so that the two mechanisms are connected as one. The scraper blade (3) and the scraper seat (4) in the scraper quick-change mechanism constitute a scraper assembly, and the pressure plate (2) and the mounting seat (1) constitute a lever structure; the scraper blade (3) is in a long rectangular shape, with the blade edge facing outward, and the blade body is clamped in the front end of the scraper seat (4) in a direction parallel to the blade edge, and a fastening screw (8) is provided in the middle and rear section of the scraper seat (4) to lock the scraper blade (3) and the scraper seat (4) together; in addition, in the lever structure composed of the pressure plate (2) and the mounting seat (1), the scraper assembly is clamped at the front end opening of the lever structure, and the rotating shaft (9) connecting the two is located in the middle. At a rearward position, the pressure plate (2) and the mounting seat (1) rotate relative to each other along the rotating shaft (9); and at the rear of the scraper assembly and in front of the rotating shaft (9), at the relative positions of the inner side surfaces of the pressure plate (2) and the mounting seat (1), relative blind holes (10) are respectively provided for installing and fixing springs (11); and at the rear of the rotating shaft (9), a lifting mechanism (12) is provided that can simultaneously apply a force to the same end of the lever structure composed of the pressure plate (2) and the mounting seat (1), and simultaneously apply a force to the pressure plate (2) and the mounting seat (1) behind the rotating shaft (9), so that the rear ends of the two are opened and the front ends are merged, thereby clamping the scraper assembly; The number of the arc-shaped racks (6) in the angle adjustment mechanism is two, which are respectively fixedly connected to the bottom surface of the mounting seat (1), and the arc-shaped convex surface thereof faces the ink tank of the gravure printing machine. The two arc-shaped racks (6) are respectively provided with arc-shaped shells (13) on the outside. The arc-shaped racks (6) slide in their respective corresponding arc-shaped shells (13), and the upward sliding limit of the arc-shaped racks (6) is less than the length of the arc-shaped shells (13); the lower end surface of the arc-shaped shell (13) is fixed to the wall panel of the gravure printing machine by bolts, and the two arc-shaped shells (13) are connected by a reinforcing rod (14); the adjusting rod (7) is a cylindrical structure, which is installed on the outer side of the upper end of the arc-shaped rack (6) and is parallel to the reinforcing rod (14) between the two arc-shaped shells (13). The adjusting rod ( 7) are respectively provided with cylindrical gears (15) at the positions in contact with the two arc-shaped racks (6), and are respectively meshed with the teeth on the two arc-shaped racks (6) through the two cylindrical gears (15); any one end of the adjusting rod (7) is a locking end, and the other end is an adjusting end; the locking end is movably connected to the connecting seat (5) through a bearing, and a thread is provided on the end extending out of the connecting seat (5) and is provided with a locking nut (16); the end of the connecting seat (5) is fixedly mounted on the wall panel of the gravure printing machine; the adjusting end is connected to the second adjusting mechanism, and can rotate the entire adjusting rod (7), and drives the arc-shaped rack (6) to slide in the arc-shaped housing (13) through the gear, thereby driving the ink scraper quick-change mechanism as a whole to rotate around the gravure printing plate.

2. The gravure printing doctor blade system with adjustable angle and quick blade change according to claim 1, characterized in that: The second adjustment mechanism is a manual rotating wheel (17) which is directly and rigidly connected to the locking end of the adjustment rod (7).

3. The gravure printing doctor blade system with adjustable angle and quick blade change according to claim 1, characterized in that: The second adjustment mechanism is an automatic adjustment device including a numerical input terminal, a signal converter and an electric actuator, wherein the locking end of the adjustment rod (7) is directly rigidly connected to the output shaft of the electric actuator, the signal converter is connected to the electric actuator via a signal line, and the numerical input terminal is connected to the signal converter via a signal line.

4. The gravure printing doctor blade system with adjustable angle and quick blade change according to claim 1 or 2, characterized in that: The ends of the joint surfaces of the ink scraping assembly and the lever structure are provided with a quick-rotating engaging structure.

5. The gravure printing doctor blade system with adjustable angle and quick blade change according to claim 4, characterized in that: The fast rotating engaging structure comprises a cylindrical connecting member (18) fixed on the rear end surface of the ink scraper seat (4), and an arc-shaped guide groove (19) respectively arranged on the lower surface of the pressure plate (2) and the upper surface of the mounting seat (1) and matching with the cylindrical connecting member (18); an eccentric clamping wheel (20) having a diameter larger than that of the cylindrical connecting member (18) body is provided at the end of the cylindrical connecting member (18), and a space having the same shape as the eccentric clamping wheel (20) and a volume larger than that of the eccentric clamping wheel (20) is provided at the end of the arc-shaped guide groove (19), the space being composed of two opposite grooves respectively arranged on the lower surface of the pressure plate (2) and the upper surface of the mounting seat (1), and the space being provided on the mounting seat (1). A circular shaft is provided at the bottom of the upper groove, and a conical clamping block (21) is provided at the end of the circular shaft; the eccentric clamping wheel (20) is a hollow cylindrical component, the end face of which is open, and an arc-shaped clamping groove (201) extending from the end face opening to the bottom face is provided on the side wall; the arc of the arc-shaped clamping groove (201) near the bottom face is greater than the arc of the upper end, forming a reverse steep slope structure (202) greater than 90 degrees; the width of the arc-shaped clamping groove (201) is greater than the diameter of the bottom of the conical clamping block (21) and smaller than the diameter of the top of the conical clamping block (21); the conical clamping block (21) is clamped into the arc-shaped clamping groove (201) from its opening and clamped in the reverse steep slope structure (202) at its bottom to form a stable connection structure.

6. The gravure printing doctor blade system with adjustable angle and quick blade change according to claim 1, characterized in that: An angle measurer (22) is installed above the connecting seat (5), and the angle measurer (22) is connected to the connecting seat (5) via a connecting rod capable of adjusting the height, and the connecting rod adjusts the height of the angle measurer (22).

7. The gravure printing doctor blade system with adjustable angle and quick blade change according to claim 1, characterized in that: The lifting mechanism (12) is a pneumatic strut or an air bag.

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