A doctor blade angle adjusting mechanism for a gravure printing machine

Abstract

The utility model belongs to the doctor blade technical field of gravure printing machine, specifically disclose a doctor blade angle adjusting mechanism for gravure printing machine, including doctor blade subassembly, rotating shaft, angle adjusting unit, transmission unit, angle detection unit and support unit, doctor blade subassembly with rotating shaft fixed connection, rotating shaft with both ends of support unit rotatory connection, angle adjusting unit includes hand wheel that rotates, is used for providing the operation input of adjustment doctor blade angle, transmission unit installs between rotating shaft and hand wheel that rotates, and hand wheel that rotates can drive rotating shaft rotates through transmission unit, angle detection unit includes angle sensing assembly that is transmission connection with rotating shaft, angle sensing assembly is used for converting the rotation angle of rotating shaft into detectable electric signal. The utility model can extract the current doctor blade angle in real time, and provides data support for operator to effectively adjust the doctor blade angle.

Description

Technical Field

[0001] This utility model relates to the field of doctor blade technology for gravure printing machines, and specifically to a doctor blade angle adjustment mechanism for gravure printing machines. Background Technology

[0002] The doctor blade in a gravure printing press removes excess ink from the printing cylinder to ensure accurate transfer of the image from the cylinder to the substrate. The angle of the doctor blade is crucial; an improper angle will result in incomplete ink removal from the cylinder, leading to defects such as blade streaks and ink fogging. A suitable doctor blade angle is essential for ensuring the quality of gravure printing.

[0003] Currently, most gravure printing machines rely on manual adjustment of the squeegee angle, depending on the operator's personal experience. After each adjustment, a new product needs to be produced, requiring further adjustment. Since the previous adjustment position is not recorded, the operator must readjust the settings, resulting in varying outcomes depending entirely on their experience. Utility Model Content

[0004] This utility model provides a doctor blade angle adjustment mechanism for a gravure printing machine, which aims to extract the current doctor blade angle in real time and provide data support for the operator to effectively adjust the doctor blade angle.

[0005] This utility model is achieved through the following technical solution: a doctor blade angle adjustment mechanism for a gravure printing machine, comprising a doctor blade assembly, a rotating shaft, an angle adjustment unit, a transmission unit, an angle detection unit, and a support unit;

[0006] The scraper assembly is fixedly connected to the rotating shaft, and the rotating shaft is rotatably connected to both ends of the support unit;

[0007] The angle adjustment unit includes a rotating handwheel for providing operational input to adjust the scraper angle;

[0008] The transmission unit is installed between the rotating shaft and the rotating handwheel, and the rotating handwheel can drive the rotating shaft to rotate through the transmission unit;

[0009] The angle detection unit includes an angle sensing component that is connected to the rotating shaft in a transmission manner. The angle sensing component is used to convert the rotation angle of the rotating shaft into a detectable electrical signal.

[0010] Compared with existing technologies, this solution has the following advantages and beneficial effects:

[0011] In this solution, the angle detection unit captures the rotation angle of the rotating shaft in real time through an angle sensing component. The rotation angle of the rotating shaft is the rotation angle of the squeegee assembly. This solution converts the mechanical angle into a detectable electrical signal, eliminating the ambiguity of traditional manual judgment based on experience. Combined with the precise transmission of the transmission unit, it ensures a significant reduction in squeegee angle adjustment errors, effectively avoiding printing defects such as blade streaks and plate fogging caused by improper angles, and significantly improving the accuracy of image transfer and the consistency of printing quality.

[0012] The handwheel provides intuitive and effortless operation input, and in conjunction with the transmission unit, it ensures smooth rotation of the rotating shaft without the need for complex operating procedures. Angle electrical signals directly provide feedback on the adjustment results, eliminating the need for operators to rely on extensive experience. Both new and experienced employees can quickly learn to operate the system, reducing fluctuations in adjustment effects due to individual differences and lowering training costs.

[0013] The electrical signals output by the angle detection unit can be recorded and stored synchronously, forming a scraper angle parameter file for each batch of products. When changing products, there is no need for repeated adjustments; historical qualified parameters can be directly retrieved for accurate reproduction, significantly shortening changeover adjustment time, improving production efficiency, and solving the pain points of traditional adjustments lacking records and involving repetitive labor.

[0014] Furthermore, the support unit includes a lifting base plate and two sets of first sliding bearing seats. The two sets of first sliding bearing seats are respectively fixedly installed at both ends of the lifting base plate, and the two ends of the rotating shaft are respectively rotatably connected to the two sets of first sliding bearing seats.

[0015] Beneficial effects: Two sets of first sliding bearing seats are symmetrically installed at both ends of the lifting base plate, providing stable and low-friction support for the rotating shaft. The standardized structure of the bearing seats reduces shaking and jamming during the operation of the rotating shaft, ensuring that the rotating shaft responds precisely to angle adjustment operations with the transmission unit, avoiding scraper angle adjustment errors caused by shaft misalignment, and further improving the accuracy of angle control.

[0016] Furthermore, the scraper assembly includes a scraper base plate, a mounting base plate, and two locking shaft seats. The two ends of the rotating shaft are respectively fixedly connected to the two locking shaft seats, and both locking shaft seats are fixedly connected to the mounting base plate. The scraper base plate is connected to the mounting base plate.

[0017] Beneficial effects: The locking bearing ensures a rigid fixation between the rotating shaft and the mounting base plate, guaranteeing that the rotational motion of the rotating shaft is fully transmitted to the mounting base plate and the squeegee base plate. There is no loose connection or transmission lag, allowing the squeegee angle to change synchronously with the rotating shaft adjustment in real time, avoiding angle adjustment deviations caused by connection gaps, and further ensuring the stability of printing quality.

[0018] Furthermore, the scraper base plate is detachably connected to the mounting base plate.

[0019] Beneficial effects: The detachable connection design allows for direct removal of the scraper base plate for replacement or repair, without disassembling the installation base plate, locking bearing, or other core connecting structures. This significantly reduces scraper replacement time, minimizes equipment downtime during production changes, lowers operational complexity during maintenance, and saves labor costs.

[0020] Furthermore, the transmission unit includes a worm gear and a worm. An end plate and a second sliding bearing seat are connected to the support unit. One end of the worm is rotatably connected to the second sliding bearing seat, and the other end of the worm passes through the end plate and is fixedly connected to the rotating handwheel. The worm is also rotatably connected to the end plate. The worm gear is coaxially fixedly connected to the rotating shaft, and the worm gear and the worm mesh with each other.

[0021] Beneficial effects: In this solution, the worm gear and worm shaft use meshing transmission with a fixed transmission ratio and small transmission clearance, which can accurately transmit the operation of turning the handwheel to the rotating shaft. This avoids power loss or deviation during transmission, ensures that the rotation angle of the rotating shaft is strictly matched with the amount of handwheel operation, further improves the accuracy of the doctor blade angle adjustment, and reduces the risk of printing defects.

[0022] Furthermore, the angle sensing component includes a rotary potentiometer, a pinion gear, and a large gear; the rotary potentiometer is mounted on the support unit, the large gear is coaxially and fixedly connected to the rotating shaft, the pinion gear is coaxially and fixedly connected to the shaft head of the rotary potentiometer, and the pinion gear and the large gear mesh with each other;

[0023] When the rotating shaft rotates, it can drive the shaft head of the rotary potentiometer to rotate through the meshing transmission of the large gear and the small gear, causing the resistance at the output terminal of the rotary potentiometer to change. The voltage at the output terminal of the rotary potentiometer is calculated based on the resistance value at the output terminal of the rotary potentiometer and the total resistance of the rotary potentiometer. The rotation angle of the rotating shaft is calculated by detecting the voltage at the output terminal of the rotary potentiometer.

[0024] Beneficial effects: The meshing transmission between the large and small gears forms a fixed transmission ratio, proportionally transmitting the rotation angle of the rotating shaft to the rotary potentiometer. Through the principle of resistance and voltage conversion, the mechanical angle is converted into a precisely measurable electrical signal, realizing the quantitative detection of the scraper angle, replacing traditional manual experience judgment, making the angle data intuitive and visible, and significantly improving the detection accuracy.

[0025] Furthermore, the resistance at the output terminal of the rotary potentiometer is The total resistance of the rotary potentiometer is , The reference voltage value applied across the rotary potentiometer is such that the voltage at the output of the rotary potentiometer is... , ;

[0026] By calibrating the relationship between the opening degree and the voltage at the output terminal of the rotary potentiometer, the rotation angle of the shaft of the rotary potentiometer is determined, and the rotation angle of the shaft of the rotary potentiometer is equal to the rotation angle of the pinion.

[0027] The pinion has the following number of teeth: The number of teeth on the large gear is The rotation angle of the pinion The rotation angle of the large gear , .

[0028] Beneficial effects: This scheme uses a clearly defined voltage calculation formula ( This converts the resistance change of the rotary potentiometer into a precise and calculable voltage value, avoiding ambiguity in the signal conversion process. Combined with the gear tooth ratio formula ( By establishing the corresponding relationship between the angle transmission of the pinion and the gear, the rotation shaft angle can be accurately derived, the detection error is greatly reduced, and the accuracy of the scraper angle adjustment is further guaranteed.

[0029] Furthermore, the angle detection unit also includes a controller and a display. The rotary potentiometer and the display are both electrically connected to the controller. The controller receives the voltage signal from the rotary potentiometer, calculates the angle according to a preset program, and then displays it on the display in real time.

[0030] Beneficial effects: The controller receives voltage signals and automatically calculates the angle according to preset calculation rules, displaying the current angle value of the scraper in real time on the monitor, replacing traditional manual judgment. Operators can intuitively observe angle changes, accurately control the adjustment range, and eliminate the need for repeated trial printing verification, significantly reducing adjustment errors and improving operational efficiency.

[0031] Furthermore, an L-shaped rotary potentiometer holder is connected to the support unit, and the rotary potentiometer is fixed to the upper part of the rotary potentiometer holder.

[0032] Beneficial effects: The L-shaped structure utilizes vertical installation space to raise the rotary potentiometer to a reasonable height, avoiding spatial interference with other components on the support unit (such as the rotating shaft, worm gear, bearing housing, etc.). Without increasing the overall footprint of the support unit, it reserves sufficient meshing space for gear meshing transmission (pinion and gear), ensuring that the coordinated operation of the angle sensing component, transmission unit, and rotating shaft is not limited by the structural layout, thus improving the overall space utilization of the mechanism.

[0033] Furthermore, the diameter of the pinion is smaller than the diameter of the gear.

[0034] Beneficial effects: The pinion and the large gear form an accelerating transmission, amplifying minute angular changes in the rotating shaft (large gear) into larger rotation angles in the pinion. This amplification effect allows the rotary potentiometer to more sensitively capture angular changes, converting minute angular differences into more noticeable voltage signal differences. This significantly improves detection accuracy during small angular adjustments and avoids measurement errors caused by excessively small angular changes. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0036] Figure 1 This is a front view of an embodiment of a doctor blade angle adjustment mechanism for a gravure printing machine according to the present invention;

[0037] Figure 2 This is a side view of an embodiment of a doctor blade angle adjustment mechanism for a gravure printing machine according to the present invention;

[0038] Figure 3 This is a circuit diagram for determining the angle in an embodiment of a doctor blade angle adjustment mechanism for a gravure printing machine according to this utility model.

[0039] The attached diagram shows the markings and corresponding component names:

[0040] 1. Scraper base plate; 2. Locking handle bolt; 3. Locking shaft seat; 4. First sliding bearing seat; 5. Mounting base plate; 6. First set screw; 7. Worm gear; 8. Second set screw; 9. Large gear; 10. Rotating shaft; 11. First fixing screw; 12. Lifting base plate; 13. Rotating potentiometer; 14. Second fixing screw; 15. Rotating potentiometer seat; 16. Third set screw; 17. Small gear; 18. Rotating handwheel; 19. End plate; 20. Worm; 21. Second sliding bearing seat; 22. Third fixing screw; 24. Fixing nut; 25. Flat key; 26. Rolling bearing. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0042] like Figures 1-2 As shown, this embodiment provides a doctor blade angle adjustment mechanism for a gravure printing machine, including a doctor blade assembly, a rotating shaft 10, an angle adjustment unit, a transmission unit, an angle detection unit, and a support unit;

[0043] The scraper assembly is fixedly connected to the rotating shaft 10, and the rotating shaft 10 is rotatably connected to both ends of the support unit;

[0044] The angle adjustment unit includes a rotating handwheel 18 for providing operational input to adjust the scraper angle;

[0045] The transmission unit is installed between the rotating shaft 10 and the rotating handwheel 18, and the rotating handwheel 18 can drive the rotating shaft 10 to rotate through the transmission unit;

[0046] The angle detection unit includes an angle sensing component that is connected to the rotating shaft 10 in a transmission manner. The angle sensing component is used to convert the rotation angle of the rotating shaft 10 into a detectable electrical signal.

[0047] In this embodiment, the support unit includes a lifting base plate 12 and two sets of first sliding bearing seats 4. The two sets of first sliding bearing seats 4 are respectively fixedly installed at the left and right ends of the lifting base plate 12 by screws. The two ends of the rotating shaft 10 are respectively rotatably connected to the two sets of first sliding bearing seats 4 through bearings.

[0048] In this embodiment, the scraper assembly includes a scraper base plate 1, a mounting base plate 5, and two locking shaft seats 3. The two ends of the rotating shaft 10 are respectively fixedly connected to the two locking shaft seats 3. In this embodiment, the rotating shaft 10 and the locking shaft seats 3 are fixedly installed by welding, screw connection, or key connection, and both locking shaft seats 3 are fixedly connected to the bottom of the mounting base plate 5 by the first fixing screw 11; the scraper base plate 1 is connected to the mounting base plate 5.

[0049] In one embodiment, such as Figure 1 As shown, the scraper base plate 1 and the mounting base plate 5 are detachably connected. Specifically, the scraper base plate 1 is fastened to the mounting base plate 5 by tightening the locking handle bolt 2. The scraper base plate 1 can be fastened or removed by tightening or loosening the locking handle bolt 2.

[0050] In one embodiment, such as Figure 1 and Figure 2 As shown, the transmission unit includes a worm gear 7 and a worm 20. An end plate 19 and a second sliding bearing seat 21 are connected to the support unit. In this embodiment, the end plate 19 is mounted on the lifting base plate 12 by a third fixing screw 22, and the second sliding bearing seat 21 is fixed to the lifting base plate 12 by screws. Figure 2 As shown, one end of the worm 20 is rotatably engaged with the second sliding bearing seat 21, and the other end of the worm 20 passes through the end plate 19 and is fixedly connected to the rotating handwheel 18. The worm 20 and the end plate 19 are rotatably connected through the rolling bearing 26. In this embodiment, the rotating handwheel 18 is fixed to the worm 20 by a flat key 25, and a fixing nut 24 is threaded onto the worm 20 on the right side of the rotating handwheel 18. By tightening the fixing nut 24, the rotating handwheel 18 and the worm 20 are fixed together, improving their stability.

[0051] In this embodiment, the worm gear 7 is coaxially and fixedly connected to the rotating shaft 10, such as... Figure 1 As shown, in this embodiment, the two sides of the worm wheel 7 are fixed to the rotating shaft 10 by the first set screw 6, and the worm wheel 7 and the worm 20 mesh with each other.

[0052] In one embodiment, such as Figure 1 and Figure 3 As shown, the angle sensing component includes a rotary potentiometer 13, a pinion 17, and a gear 9. The rotary potentiometer 13 is mounted on a support unit. In this embodiment, an L-shaped rotary potentiometer base 15 is connected to the support unit. Specifically, the bottom of the rotary potentiometer base 15 is fixed to the lifting base plate 12 by a second fixing screw 14, and the rotary potentiometer 13 is fixed to the upper part of the rotary potentiometer base 15 by screws.

[0053] In this embodiment, the large gear 9 and the rotating shaft 10 are coaxially fixedly connected by the second set screw 8, and the small gear 17 and the shaft head of the rotating potentiometer 13 are coaxially fixedly connected by the third set screw 16. The small gear 17 and the large gear 9 mesh with each other. In this embodiment, the diameter of the small gear 17 is smaller than the diameter of the large gear 9.

[0054] When the rotating shaft 10 rotates, it can drive the shaft head of the rotating potentiometer 13 to rotate through the meshing transmission of the large gear 9 and the small gear 17, causing the resistance at the output terminal of the rotating potentiometer 13 to change. The voltage at the output terminal of the rotating potentiometer 13 is calculated based on the resistance value at the output terminal of the rotating potentiometer 13 and the total resistance of the rotating potentiometer 13. The rotation angle of the rotating shaft 10 is calculated by detecting the voltage at the output terminal of the rotating potentiometer 13, thereby obtaining the rotation angle of the scraper base plate 1.

[0055] In one embodiment, such as Figure 3 As shown, the rotary potentiometer 13 has three pins: A, B, and C. Pins A and C are connected to the two ends of the internal resistive element of the rotary potentiometer 13, acting as fixed terminals. Pin B is connected to a movable slider, acting as an adjustable terminal. The shaft of the rotary potentiometer is connected to the internal slider. When the shaft of the rotary potentiometer 13 rotates, the slider moves along the resistive element, changing the resistance values ​​between A and B, and between B and C. When a voltage is applied to the two pins of the rotary potentiometer 13, the output voltage of the rotary potentiometer 13 changes with the rotation of the shaft. Taking a 5V power supply as an example:

[0056] Connect the positive terminal of the power supply to pin A, connect the negative terminal of the power supply to pin C, and use pin B as the output terminal.

[0057] When the shaft of the rotary potentiometer 13 rotates, the voltage between pin B and pin A (5VG) will change due to the rotation of the shaft of the rotary potentiometer 13.

[0058] In this embodiment, the resistance at the output terminal of the rotary potentiometer 13 is The total resistance of the rotary potentiometer 13 is , In this embodiment, the reference voltage value applied across the rotary potentiometer 13 is... The voltage at the output terminal of the rotary potentiometer 13 is equal to 5. , ;

[0059] The rotation angle of the potentiometer's shaft is determined by calibrating the relationship between the opening degree and the voltage at the output terminal of the rotary potentiometer 13. The calibration method is as follows: Rotate the mounting base 5 by turning the handwheel 18, and measure this angle using an angle gauge. It is best to rotate to an integer angle, such as 10 degrees, designated as A1. Measure the output voltage before and after rotation. Subtract the voltage before rotation from the voltage after rotation to obtain the voltage value V1, which corresponds to the angle A1. Then rotate by a certain angle A2, such as A2 = 20 degrees, and record the voltage value after rotation. Subtract the voltage value before rotation A2 from the voltage value after rotation to obtain the voltage value V2, which corresponds to the rotation angle A2. By fitting the relationship between angle and voltage (a linear function) using a two-point formula (A1, V1)(A2, V2), the relationship between voltage and angle is calibrated. The corresponding rotation angle can then be calculated from the measured voltage values.

[0060] The linear function is: , For angle, This is the change in voltage. The slope; ; Will Substituting into the equation, we get: , , , , These are the known parameters during the calibration phase. This represents the actual measured voltage change. The angle to be determined;

[0061] Assuming calibration data:

[0062] Corresponding (After rotating 10°, the voltage is 0.5V higher than the initial value);

[0063] Corresponding (After rotating 20°, the voltage is 1.0V higher than the initial value).

[0064] Calculate the slope : ;

[0065] If in actual measurement, (The current voltage is 0.8V higher than the initial value), then the actual angle is: .

[0066] The rotation angle of the shaft of the rotary potentiometer 13 is equal to the rotation angle of the pinion 17;

[0067] The number of teeth on pinion 17 is The number of teeth on the large gear 9 is The rotation angle of pinion 17 The rotation angle of large gear 9 , The rotation angle of large gear 9 That is, the angle at which the scraper base plate 1 rotates relative to the lifting base plate 12.

[0068] In one embodiment, the angle detection unit further includes a controller and a display. The rotary potentiometer 13 and the display are both electrically connected to the controller. The controller receives the voltage signal from the rotary potentiometer 13, calculates the rotation adjustment angle of the scraper according to the preset program rules, and then displays it on the display in real time.

[0069] That is, after the controller receives the voltage signal from the output terminal of the rotary potentiometer 13, it calculates the rotation angle of the scraper base plate 1 according to the formula in the above embodiment.

[0070] The specific implementation process is as follows:

[0071] When the scraper angle needs to be adjusted, the handwheel 18 is rotated, which in turn drives the worm gear 20 to rotate. The worm gear 20 then drives the worm wheel 7, which meshes with it, to rotate. Since the worm wheel 7 is fixed to the rotating shaft 10, it drives the rotating shaft 10 to rotate. The rotating shaft 10 rotates around the axis of the first sliding bearing seat 4, causing the locking shaft seat 3, which is fixed to the rotating shaft 10, to rotate around the axis of the rotating shaft 10. This causes the mounting base plate 5 and the scraper base plate 1, which is fixed to it, to rotate together, thus changing the angle of the scraper relative to the lifting base plate 12.

[0072] During the rotation of the rotating shaft 10, the large gear 9 fixed to it also rotates. The rotation of the large gear 9 drives the small gear 17 meshing with it to rotate, thereby causing the shaft of the rotary potentiometer 13 to rotate, which in turn causes the output resistance and output voltage of the rotary potentiometer 13 to change. By applying voltage to the two pins (A and C pins) of the rotary potentiometer 13, the voltage at the output terminal (B pin) will change with the rotation of the shaft of the rotary potentiometer 13.

[0073] Rotate potentiometer 13 as follows Figure 3 With the circuit diagram shown, the voltage between point B and pin A (5VG) will change due to the rotation of the shaft of potentiometer 13. The specific calculation is as follows: Let the resistance between point B and pin A (5VG) be... The total resistance of the entire potentiometer is Then the voltage at point B relative to pin A (5VG) is:

[0074] .

[0075] By calibrating the relationship between the opening degree and voltage, the angle through which the pinion 17 rotates can be determined by measuring the voltage at point B relative to point A (5VG). Assuming the number of teeth on the pinion 17 is Z1 and the number of teeth on the gear 9 is Z2, multiplying the angle through which the pinion 17 rotates by Z1 and dividing by Z2 gives the angle through which the gear 9 rotates, which is the current angle of rotation of the scraper base plate 1 relative to the lifting base plate 12. Finally, this is displayed and recorded on the screen, allowing the current scraper angle to be extracted in real time, providing data support for the operator to effectively adjust the scraper angle.

[0076] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A doctor blade angle adjustment mechanism for a gravure printing machine, characterized in that, It includes a scraper assembly, a rotating shaft, an angle adjustment unit, a transmission unit, an angle detection unit, and a support unit; The scraper assembly is fixedly connected to the rotating shaft, and the rotating shaft is rotatably connected to both ends of the support unit; The angle adjustment unit includes a rotating handwheel for providing operational input to adjust the scraper angle; The transmission unit is installed between the rotating shaft and the rotating handwheel, and the rotating handwheel can drive the rotating shaft to rotate through the transmission unit; The angle detection unit includes an angle sensing component that is connected to the rotating shaft for transmission. The angle sensing component is used to convert the rotation angle of the rotating shaft into a detectable electrical signal.

2. The doctor blade angle adjustment mechanism for a gravure printing machine according to claim 1, characterized in that, The support unit includes a lifting base plate and two sets of first sliding bearing seats. The two sets of first sliding bearing seats are respectively fixedly installed at both ends of the lifting base plate, and the two ends of the rotating shaft are respectively rotatably connected to the two sets of first sliding bearing seats.

3. The doctor blade angle adjustment mechanism for a gravure printing machine according to claim 2, characterized in that, The scraper assembly includes a scraper base plate, a mounting base plate, and two locking shaft seats. The two ends of the rotating shaft are respectively fixedly connected to the two locking shaft seats, and the two locking shaft seats are fixedly connected to the mounting base plate. The scraper base plate is connected to the mounting base plate.

4. The doctor blade angle adjustment mechanism for a gravure printing machine according to claim 3, characterized in that, The scraper base plate is detachably connected to the mounting base plate.

5. The doctor blade angle adjustment mechanism for a gravure printing machine according to claim 1, characterized in that, The transmission unit includes a worm gear and a worm. An end plate and a second sliding bearing seat are connected to the support unit. One end of the worm is rotatably connected to the second sliding bearing seat, and the other end of the worm passes through the end plate and is fixedly connected to the rotating handwheel. The worm is also rotatably connected to the end plate. The worm gear is coaxially fixedly connected to the rotating shaft, and the worm gear and the worm mesh with each other.

6. The doctor blade angle adjustment mechanism for a gravure printing machine according to claim 1, characterized in that, The angle sensing component includes a rotary potentiometer, a pinion gear, and a large gear; the rotary potentiometer is mounted on the support unit, the large gear is coaxially and fixedly connected to the rotating shaft, the pinion gear is coaxially and fixedly connected to the shaft head of the rotary potentiometer, and the pinion gear and the large gear mesh with each other; When the rotating shaft rotates, it can drive the shaft head of the rotary potentiometer to rotate through the meshing transmission of the large gear and the small gear, causing the resistance at the output terminal of the rotary potentiometer to change. The voltage at the output terminal of the rotary potentiometer is calculated based on the resistance value at the output terminal of the rotary potentiometer and the total resistance of the rotary potentiometer. The rotation angle of the rotating shaft is calculated by detecting the voltage at the output terminal of the rotary potentiometer.

7. The doctor blade angle adjustment mechanism for a gravure printing machine according to claim 6, characterized in that, The resistance at the output terminal of the rotary potentiometer is The total resistance of the rotary potentiometer is , The reference voltage value applied across the rotary potentiometer is such that the voltage at the output of the rotary potentiometer is... , ; By calibrating the relationship between the opening degree and the voltage at the output terminal of the rotary potentiometer, the rotation angle of the shaft of the rotary potentiometer is determined, and the rotation angle of the shaft of the rotary potentiometer is equal to the rotation angle of the pinion. The pinion has the following number of teeth: The number of teeth on the large gear is The rotation angle of the pinion The rotation angle of the large gear , .

8. The doctor blade angle adjustment mechanism for a gravure printing machine according to claim 6, characterized in that, The angle detection unit also includes a controller and a display. The rotary potentiometer and the display are both electrically connected to the controller. The controller receives the voltage signal from the rotary potentiometer, calculates the angle according to a preset program, and displays it on the display in real time.

9. The doctor blade angle adjustment mechanism for a gravure printing machine according to claim 6, characterized in that, An L-shaped rotary potentiometer holder is connected to the support unit, and the rotary potentiometer is fixed to the upper part of the rotary potentiometer holder.

10. The doctor blade angle adjustment mechanism for a gravure printing machine according to claim 6, characterized in that, The diameter of the pinion is smaller than the diameter of the gear.

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