Rotary press blanket cylinder pressure adjusting mechanism and method

Abstract

The invention relates to the technical field of rotary presses, provides a rotary press blanket cylinder pressure adjusting mechanism and method, and aims to solve the problems that a traditional press blanket cylinder is inconvenient in pressure adjustment, unstable in printing quality and the like. The mechanism comprises an air cylinder, a transmission operation clutch pressing shaft, a backer, a positioning rod, a digital hand wheel, a bent lever, an eccentric swing rod, an eccentric sleeve, a blanket cylinder and other key components. Power is provided through the air cylinder and the transmission operation clutch pressing shaft, and pressing-on and pressing-off operation is achieved. The distance between the blanket cylinders is accurately controlled through linkage of the positioning rod and the digital hand wheel, and dynamic pressure adjustment is achieved; the synergistic effect of the curved bar and the eccentric sleeve ensures stable movement of the roller and reduces mechanical impact. In addition, a rubber blanket tensioning mechanism is further arranged, the design of a rubber cylinder neutral position opening is optimized, and the printing quality and stability are further improved. Through high integration of mechanical innovation and dynamic control, breakthrough improvement is achieved in the aspects of printing precision, stability, energy consumption control and the like.

Description

Technical Field

[0001] The invention relates to the technical field of rotary printing presses, and in particular to a mechanism and method for adjusting the pressure of a rubber cylinder of a rotary printing press. Background Art

[0002] In rotary printing, the BB printing form is generally adopted, that is, the two rubber cylinders provide pressure for each other's impression rubber cylinder, providing a corresponding transfer method for the printed paper, and the paper is transferred through the two rubber cloth rubber cylinders to achieve the purpose of printing. In this process, the pressure of the rubber cylinder is required to be stable, and there should be no obvious jump during operation.

[0003] The rubber cloth, which plays an important role in printing, is rolled on the rubber cylinder. Due to the gap in the reel of the rubber cloth itself and the elasticity of the rubber cloth, mechanical jumping will occur at the intersection of the rubber cylinders, resulting in impact bars. That is, at the gap of the rubber cylinder of the existing rotary printing press, the rubber cloth will be bent at a small angle, so that the rubber cloth will be vacant at this position, that is, this position will become higher, and when rotating, there will be a reaction force. Since the plate rubber cylinder and the rubber cylinder are also under pressure, when the gap of the two rubber cylinders meets, the pressure between the two rubber cylinders suddenly loses. At this time, the plate rubber cylinder and the rubber cylinder will be impacted, and an impact bar will appear on the plate rubber cylinder (a printing fault, one or more light-colored stripes of a certain width, the stripe width is the size of the rubber mouth width).

[0004] In order to solve this problem, most rotary printing machines currently use rubber cylinders with ultra-high hardness shoulder irons (the shoulder iron is a high-precision and high-hardness narrow cylinder, which is mounted on both ends of the rubber cylinder). When the rubber cylinder is running, the shoulder irons are basically leaning against each other, or the gap is within 0.01mm, and the mechanical vibration caused by the rubber cloth is offset at the gap, thereby achieving stable printing.

[0005] When adjusting the printing pressure between the rubber cylinders, it is necessary to change the thickness of the lining, or sacrifice a certain printing quality to allow the shoulder iron to separate a certain gap. When adjusting the printing pressure, the pressure is adjusted using a fixed paper, which indicates that it has the best printing effect when printing. When the paper changes, the printing effect changes immediately, or the thickness range of the paper is not so large. When encountering out-of-range paper, it is necessary to adjust the rubber cylinder pressure of the printing press, replace the lining, or simply reduce the pressure to adapt to the printing of out-of-range paper. This requires more printing preparation time, increases printing costs, is cumbersome to operate, and is technically difficult, affecting the production of the printing plant. Summary of the invention

[0006] In order to solve the problems existing in the background technology, the present invention provides a pressure adjustment mechanism for a rubber cylinder of a rotary printing press, which comprises:

[0007] The cylinder and the transmission operation clutch pressure shaft are connected by a second connecting rod, and the cylinder and the transmission operation clutch pressure shaft provide power for the clutch pressure operation;

[0008] Backrest, the lower part of the backrest is rotatably connected to the backrest shaft, and the upper part is a free end;

[0009] The positioning rod and the digital hand wheel, the left end of the positioning rod is connected to the digital hand wheel, and the right end is connected to the left side of the free end of the backrest; the positioning rod provides rightward pressure for the free end of the backrest;

[0010] The crank rod is provided with an upper crank rod and a lower crank rod, and the connection point is an inflection point; the upper end of the upper crank rod is hinged to the second connecting rod, and the lower end of the lower crank rod is connected to the right eccentric sleeve;

[0011] The eccentric swing rod comprises an upper eccentric swing rod and a lower eccentric swing rod; the upper eccentric swing rod is arranged above the left eccentric sleeve, and is hinged to the inflection point of the curved rod through the first connecting rod; the bottom of the lower eccentric swing rod is connected to the right side of the free end of the backrest, providing leftward pressure for the free end of the backrest;

[0012] The eccentric sleeve comprises a left eccentric sleeve and a right eccentric sleeve; the rotation center of the left eccentric sleeve is the left eccentric axis, and the rotation center of the right eccentric sleeve is the right eccentric axis;

[0013] A rubber cylinder, with a rubber cloth wrapped around the outside of the rubber cylinder; the rubber cylinder includes a left rubber cylinder and a right rubber cylinder, which are eccentrically connected to the left eccentric sleeve and the right eccentric sleeve respectively, and the axis of the left rubber cylinder is located on the left side of the left eccentric axis, and the axis of the right rubber cylinder is located on the right side of the right eccentric axis.

[0014] In the preferred solution, the rubber cylinder is provided with a gap opening, whose radius is smaller than the outer circumference radius of the rubber cylinder and gradually decreases to form an "eight" shape, and the maximum radius difference between the gap opening and the rubber cylinder is 15% of the radius of the rubber cylinder.

[0015] In the preferred scheme, a rubber cloth tensioning mechanism is also provided, including a worm wheel and a worm. The worm wheel is directly connected to the reel of the rubber cloth and is used to drive the reel to rotate and control the winding and tightness of the rubber cloth. The worm drives the worm wheel to rotate by rotating to achieve forward and reverse movement of the reel. A fixed groove is provided in the rubber cylinder, and the free end of the rubber cloth reel is installed in the fixed groove of the reel.

[0016] In a preferred solution, a left-plate rubber cylinder and a right-plate rubber cylinder are further provided, which are respectively connected with the left rubber cylinder and the right rubber cylinder in pressure contact and cooperate with the rubber cylinder to realize printing.

[0017] In a preferred embodiment, the angle between the upper curved rod and the lower curved rod is greater than 90°.

[0018] In the preferred solution, the positioning rod is a lead screw structure, the digital hand wheel is provided with a proportional scale matching the lead screw pitch, and the rotation circle scale of the digital hand wheel accurately corresponds to the displacement of the positioning rod and the printing pressure value between the rubber cylinders.

[0019] A method for adjusting the pressure of a rubber cylinder of a rotary printing press using a rubber cylinder pressure adjustment mechanism comprises the following steps:

[0020] S1, the closing process, after the printing press receives the closing signal, the cylinder contracts, and the transmission operation clutch pressing shaft is driven to move downward through the second connecting rod, and then the crankshaft and the right eccentric sleeve are driven to rotate clockwise, and finally the left rubber cylinder and the right rubber cylinder are moved inward to form printing pressure; the bottom of the lower eccentric swing rod provides leftward pressure for the free end of the backrest;

[0021] S2, dynamic pressure adjustment process, by rotating the digital hand wheel to control the left and right movement of the positioning rod, and then adjust the position of the backrest and the lower eccentric swing rod, drive the rotation direction of the left eccentric sleeve and the right eccentric sleeve, realize the reduction or increase of the distance between the left and right rubber cylinders, and adjust the increase or decrease of the printing pressure;

[0022] S3, during the release process, the cylinder piston rod extends, pushing the transmission operation clutch pressure shaft upward, driving the curved rod and the right eccentric sleeve to rotate counterclockwise, so that the left and right rubber cylinders move outward and release the printing pressure.

[0023] Further, the specific process of step S1 includes:

[0024] S1, during the closing process, the printing press receives the closing signal, and the cylinder starts to retract; the cylinder piston rod pulls the transmission operation clutch pressing shaft downward through the second connecting rod, causing it to move downward along the axis, driving the inflection point of the crankshaft to move downward synchronously, and the downward inflection point applies a clockwise rotation torque to the right eccentric sleeve through the second connecting rod, and the power is amplified; the pulling of the second connecting rod causes the right eccentric sleeve to rotate clockwise around its fixed axis;

[0025] The rotation of the right eccentric sleeve drives the lower eccentric swing rod to swing leftward, and transmits power to the upper eccentric swing rod through the first connecting rod; the upper eccentric swing rod is pushed by the first connecting rod to drive the left eccentric sleeve to rotate clockwise; when the left eccentric sleeve and the right eccentric sleeve rotate clockwise synchronously, the left rubber roller and the right rubber roller move inward around the left eccentric axis and the right eccentric axis, and the distance between the two rubber rollers is reduced to form printing pressure. At the same time, the bottom of the lower eccentric swing rod provides leftward pressure to the free end of the backrest from the right side of the free end of the backrest.

[0026] Further, the specific process of step S2 includes:

[0027] S2, dynamic pressure adjustment process, when it is necessary to reduce the distance between the left rubber roller and the right rubber roller:

[0028] S21, rotating the digital hand wheel, converting the rotational motion into the leftward linear displacement of the positioning rod through the lead screw; when the positioning rod moves to the left, the free end of the backrest swings to the left; when the backrest swings, the push-pull force of the positioning rod and the reaction force of the lower eccentric swing rod form a torque balance at the backrest axis; at the same time, the lower eccentric swing rod moves to the left, causing the left eccentric sleeve to rotate clockwise; the clockwise rotation of the left eccentric sleeve pushes the inflection point of the crank rod to move downward through the first connecting rod; the downward movement of the inflection point of the crank rod drives the right eccentric sleeve to rotate synchronously clockwise; the left rubber cylinder and the right rubber cylinder move inward, the spacing is reduced, and the printing pressure is increased;

[0029] When you need to reduce the distance between the left and right rubber rollers:

[0030] S22. Rotate the digital hand wheel, the positioning rod moves right, the free end of the backrest swings right, and at the same time, the lower eccentric swing rod moves right, driving the left eccentric sleeve to rotate counterclockwise; the left eccentric sleeve rotates counterclockwise to pull the inflection point of the crank rod upward through the first connecting rod; the upward movement of the inflection point of the crank rod drives the right eccentric sleeve to rotate counterclockwise synchronously; the left rubber cylinder and the right rubber cylinder move outward, the spacing increases, and the printing pressure decreases proportionally.

[0031] Further, the specific process of step S3 includes:

[0032] S3, during the depressing process, the cylinder piston rod extends, pushing the transmission operating clutch pressure shaft upward, driving the bending rod inflection point to move upward synchronously; the inflection point moves upward and pushes the right eccentric sleeve to rotate counterclockwise through the second connecting rod; when the right eccentric sleeve rotates counterclockwise, the lower eccentric swing rod swings to the right, and pulls the upper eccentric swing rod through the first connecting rod, driving the left eccentric sleeve to rotate counterclockwise; the left eccentric sleeve and the right eccentric sleeve rotate counterclockwise, and the left rubber roller and the right rubber roller move outward around the left eccentric axis and the right eccentric axis respectively, the distance between the rubber rollers increases, and the printing pressure is released.

[0033] The beneficial effects achieved by the present invention are:

[0034] The technical scheme of the present invention designs the connection between the cylinder and the transmission operation clutch pressure shaft, the linkage scheme between the backrest and the positioning rod, the coordinated action scheme between the curved rod and the eccentric sleeve, the screw structure of the digital hand wheel and the positioning rod, the rubber cloth tensioning mechanism, the optimized design of the rubber cylinder gap, the realization of the dynamic pressure adjustment process and the rapid response of the pressure release process, etc., so as to realize the precise adjustment and stable control of the pressure of the rubber cylinder of the rotary printing press. Specifically including:

[0035] First, the present invention is designed to connect the cylinder and the transmission operation clutch pressure shaft through the second connecting rod, and the cylinder provides the power for the clutch pressure operation, so that the clutch pressure and release pressure operations are faster and more stable, and the printing pressure can be quickly established and released, thereby improving the response speed and working efficiency of the printing press.

[0036] Second, the present invention has carried out the linkage design of the backrest and the positioning rod. The lower part of the backrest is rotatably connected to the backrest shaft, and the upper part is a free end. The left end of the positioning rod is connected to the digital hand wheel, and the right end is connected to the left side of the free end of the backrest, providing rightward pressure for the free end of the backrest. Through the linkage of the positioning rod and the backrest, the swing angle of the backrest can be accurately controlled, thereby realizing the fine adjustment of the spacing between the rubber rollers, and improving the accuracy and stability of pressure regulation.

[0037] Third, the curved rod of the present invention is provided with an upper curved rod and a lower curved rod, and the connection point is an inflection point; the upper end of the upper curved rod is connected to the second connecting rod, and the lower end of the lower curved rod is connected to the right eccentric sleeve; the left eccentric sleeve and the right eccentric sleeve are eccentrically connected to the left rubber cylinder and the right rubber cylinder respectively. The synergistic effect of the curved rod and the eccentric sleeve makes the rotation and movement of the rubber cylinder more stable, which can effectively reduce mechanical shock, extend the service life of the equipment, and ensure the uniform distribution of printing pressure.

[0038] Fourth, the present invention designs a screw structure for reading the digital hand wheel and the positioning rod. The positioning rod is a screw structure. The digital hand wheel is provided with a proportional scale matching the lead of the screw. The rotation circle scale of the digital hand wheel accurately corresponds to the displacement of the positioning rod and the printing pressure value between the rubber rollers. The pressure regulation is more intuitive and accurate. The operator can directly read the pressure value through the scale of the digital hand wheel to achieve online real-time adjustment. The left and right movement of the positioning rod is controlled by rotating the digital hand wheel, and then the position of the backrest and the lower eccentric swing rod is adjusted to drive the rotation direction of the left eccentric sleeve and the right eccentric sleeve, so as to reduce or increase the distance between the left rubber roller and the right rubber roller, and adjust the increase or decrease of the printing pressure. The dynamic pressure regulation process allows the printing pressure to be adjusted in real time according to actual needs to adapt to printing materials of different thicknesses.

[0039] Fifth, the present invention designs a rubber blanket tensioning mechanism including a worm wheel and a worm. The worm wheel is directly connected to the reel of the rubber blanket, and is used to drive the reel to rotate and control the winding and tension of the rubber blanket. The worm drives the worm wheel to rotate by rotating to realize the forward and reverse movement of the reel. The rubber blanket tension is automatically adjusted to ensure that the rubber blanket is always kept in an appropriate tight state during the printing process, avoiding printing quality problems caused by loose or over-tightened rubber blanket, and improving the stability and consistency of printing.

[0040] Sixth, the eccentric axes of the left and right eccentric sleeves of the present invention are offset from the axis of the rubber roller to form a non-concentric structure. When the eccentric sleeve rotates, radial displacement is generated, which directly drives the rubber roller to move inward or outward, thereby realizing micron-level adjustment of the spacing between the rubber rollers (±0.01mm accuracy); the present invention converts the linear motion of the cylinder into the rotational torque of the eccentric sleeve through the structure of the crankshaft and the connecting rod, and the power amplification factor can reach 3-5 times, significantly reducing the energy consumption of the cylinder. The upper and lower eccentric swing rods form a forced linkage chain through the crankshaft and the first connecting rod and the second connecting rod. Synchronization error ≤ 0.005mm: The phase difference of the left and right rubber roller movements is controlled within ±0.5° to avoid the problem of uneven pressure caused by the gap in traditional gear transmission. When the unilateral drive fails, the other side is forced to maintain linkage through the connecting rod to prevent the rubber roller from getting stuck, and the risk of downtime is reduced by 90%. Synchronous movement expands the pressure adjustment range to 0.1-1.5mm, while the traditional mechanical limit structure is only 0.5-1.0mm, which can adapt to 30-350g / m 2 The paper thickness varies.

[0041] Seventh, the present invention has improved the design of the gaps opened on the rubber cylinders, which can effectively reduce the height of the rubber cloth in the air at the intersection of the rubber cylinders, reduce the instantaneous impact force, and avoid the generation of impact bars, thereby improving the quality and appearance of the printed matter. The radius of the gap gradually decreases in an "eight" shape from the end of the rubber cylinder to the center, and the maximum radius difference is 15% of the radius of the rubber cylinder. The gradual structure optimizes the bending angle of the rubber cloth from the traditional design of 90° to ≤30°, and reduces the height by 70% (from 0.3mm to 0.09mm). The optimization of the shape of the gap reduces the peak impact force of the intersection by 45% (actually measured from 1200N to 660N). The incidence of impact bars is reduced from 3-5 per 10,000 printed sheets in the traditional structure to less than 0.2.

[0042] The technical solution of the present invention achieves breakthrough improvements in printing accuracy, stability, energy consumption control, etc. through a high degree of integration of mechanical innovation and dynamic control. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 yes Figure 1 Schematic diagram of the structure of the left rubber roller and the right rubber roller;

[0045] Figure 3 It is a schematic diagram of the structure of the left rubber cylinder and the right rubber cylinder connected to the rubber cloth;

[0046] Figure 4 yes Figure 3 A magnified view of the structure at center;

[0047] Figure 5 It is a cross-sectional view of the variable diameter structure of the left rubber roller.

[0048] Numbers in the figure:

[0049] 1. Digital hand wheel; 2. Positioning rod; 3. Backrest; 301. Backrest shaft; 4. Crank rod; 51. Upper eccentric swing rod; 52. Lower eccentric swing rod; 6. First connecting rod; 7. Transmission operation clutch pressure shaft; 8. Second connecting rod; 9. Cylinder; 10. Left eccentric sleeve; 101. Left eccentric axis; 11. Right eccentric sleeve; 111. Right eccentric axis; 12. Left rubber roller; 121. Left rubber roller axis; 13. Right rubber roller; 131. Right rubber roller axis; 14. Rubber cloth; 15. Left rubber roller; 16. Right rubber roller; 17. Worm; 18. Worm wheel; 19. Fixed groove; 20. Neutral opening. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative, and the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0051] Reference Figure 1 - Figure 5 A rotary printing press rubber cylinder pressure adjustment mechanism is composed of multiple key components. The components are precisely mechanically connected and coordinated to achieve accurate adjustment and stable control of the rubber cylinder pressure. The following is a description of the main structural components and functions of the mechanism:

[0052] The cylinder 9 and the transmission operation clutch pressure shaft 7, the cylinder 9: provides the power source for the clutch pressure operation, and realizes the closing and releasing pressure operation through contraction and extension. The transmission operation clutch pressure shaft 7: is connected to the cylinder 9 through the second connecting rod 8, and transmits the power of the cylinder 9 to the crankshaft 4 and the eccentric sleeve to realize the closing and releasing pressure of the roller.

[0053] Backrest 3 and positioning rod 2, backrest 3: the lower part is rotatably connected to the backrest shaft 301, and the upper part is a free end for supporting and transmitting pressure. Positioning rod 2: the left end is connected to the digital hand wheel 1, and the right end is connected to the left side of the free end of backrest 3, and the left and right movement is achieved through the screw structure, providing rightward pressure for the free end of backrest 3.

[0054] The bent rod 4 and the eccentric swing rod, the bent rod 4: is provided with an upper bent rod 4 and a lower bent rod 4, and the connection point is an inflection point. The upper end of the upper bent rod 4 is hinged to the second connecting rod 8, and the lower end of the lower bent rod 4 is connected to the right eccentric sleeve 11. The bent rod 4 drives the rotation of the eccentric sleeve by moving up and down at the inflection point.

[0055] The eccentric swing rod includes an upper eccentric swing rod 51: arranged above the left eccentric sleeve 10, hinged at the inflection point of the bent rod 4 through the first connecting rod 6, and transmitting power to the left eccentric sleeve 10. The lower eccentric swing rod 52: the bottom is connected to the right side of the free end of the backrest 3, providing leftward pressure for the free end of the backrest 3, and transmitting power to the right eccentric sleeve 11.

[0056] The eccentric sleeve includes a left eccentric sleeve 10: the rotation center is the left eccentric axis 101, and is eccentrically connected to the left rubber cylinder 12. The right eccentric sleeve 11: the rotation center is the right eccentric axis 111, and is eccentrically connected to the right rubber cylinder 13. The rotation of the eccentric sleeve directly drives the movement of the rubber cylinder to adjust the cylinder spacing.

[0057] The rubber cylinder includes a left rubber cylinder 12: a rubber cloth 14 is wound around the outside, the axis is located on the left side of the left eccentric axis 101, and the rubber cylinder is eccentrically connected to the left eccentric sleeve 10. A right rubber cylinder 13: a rubber cloth 14 is wound around the outside, the axis is located on the right side of the right eccentric axis 111, and the rubber cylinder is eccentrically connected to the right eccentric sleeve 11. The movement of the rubber cylinder realizes the establishment and release of printing pressure.

[0058] The tensioning mechanism of the blanket 14 includes a worm 17: the worm 18 is driven to rotate by rotation to realize the forward and reverse movement of the reel. The worm gear 18 is directly connected to the reel of the blanket 14, and is used to drive the reel to rotate and control the winding and tension of the blanket 14. It ensures that the blanket 14 always maintains appropriate tension during the printing process to avoid printing quality problems caused by looseness or over-tightening.

[0059] The plate rubber cylinder includes a left plate rubber cylinder 15: connected to the left rubber cylinder 12 by pressure contact, and cooperates to achieve printing. The right plate rubber cylinder 16: connected to the right rubber cylinder 13 by pressure contact, and cooperates to achieve printing. The cooperation between the plate rubber cylinder and the rubber cylinder ensures the smooth progress of the printing process.

[0060] The digital hand wheel 1 is provided with a proportional scale matching the lead of the lead screw, and the positioning rod 2 is moved left and right by rotation to accurately control the adjustment of the printing pressure.

[0061] The first connecting rod 6 connects the upper eccentric swing rod 51 and the inflection point of the curved rod 4 to transmit power to the left eccentric sleeve 10 .

[0062] The second connecting rod 8 connects the cylinder 9 and the transmission operation clutch pressure shaft 7, and transmits the power of the cylinder 9 to the crankshaft 4 and the right eccentric sleeve 11.

[0063] The fixing groove 19 is arranged in the rubber cylinder and used for mounting the free end of the rubber cloth 14 reel to ensure the stable winding of the rubber cloth 14 .

[0064] The gap 20 is opened on the rubber cylinder, and its radius is smaller than the outer circumference radius of the rubber cylinder and gradually decreases, forming an "eight" shape. The optimized design reduces the flying height of the rubber cloth 14 at the intersection of the cylinders, reduces the instantaneous impact force, and avoids the impact bar.

[0065] The rotary printing press rubber cylinder pressure adjustment mechanism is powered by the cylinder 9 and the transmission operation clutch pressure shaft 7, the backrest 3 and the positioning rod 2 realize the transmission and adjustment of the pressure, the curved rod 4 and the eccentric swing rod cooperate to realize the precise movement of the cylinder, the eccentric sleeve directly drives the movement of the rubber cylinder, the rubber cloth 14 tensioning mechanism ensures the stability of the tension of the rubber cloth 14, and the plate rubber cylinder cooperates with the rubber cylinder to realize printing. Through the precise mechanical connection and synergy between the various components, the precise adjustment and stable control of the printing pressure are realized, which significantly improves the printing quality and production efficiency.

[0066] The working process of the pressure regulating mechanism of the rubber cylinder of a rotary printing press of the present invention is as follows:

[0067] S1, during the closing process, after the printing press receives the closing signal, the cylinder 9 starts to retract. The piston rod of the cylinder 9 pulls the transmission operation clutch pressing shaft 7 downward through the second connecting rod 8, causing it to move downward along the axis. The bent rod 4 and the right eccentric sleeve 11 rotate: the transmission operation clutch pressing shaft 7 drives the inflection point of the bent rod 4 to move downward synchronously. The downward inflection point applies a clockwise rotation torque to the right eccentric sleeve 11 through the second connecting rod 8, and the power is amplified. The right eccentric sleeve 11 rotates: the pulling of the second connecting rod 8 causes the right eccentric sleeve 11 to rotate clockwise around its fixed axis. The rotation of the right eccentric sleeve 11 drives the lower eccentric swing rod 52 to swing to the left. The power is transmitted to the upper eccentric swing rod 51: the lower eccentric swing rod 52 transmits the power to the upper eccentric swing rod 51 through the first connecting rod 6. The upper eccentric swing rod 51 is thrust by the first connecting rod 6, driving the left eccentric sleeve 10 to rotate clockwise. The left eccentric sleeve 10 and the right eccentric sleeve 11 rotate synchronously: the left eccentric sleeve 10 and the right eccentric sleeve 11 rotate synchronously clockwise.

[0068] The left rubber cylinder 12 and the right rubber cylinder 13 move inward around the left eccentric axis and the right eccentric axis, and the distance between the two rubber cylinders is reduced to form printing pressure. The lower eccentric swing rod 52 provides pressure: the bottom of the lower eccentric swing rod 52 provides leftward pressure for the free end of the backing 3 from the right side of the free end of the backing 3.

[0069] S2, dynamic pressure adjustment process, rotating digital hand wheel 1: by rotating digital hand wheel 1, the rotational motion is converted into the left linear displacement of positioning rod 2 through the lead screw. When positioning rod 2 moves to the left, the free end of backrest 3 swings to the left. Backrest 3 and lower eccentric swing rod 52 are linked: when backrest 3 swings, the push-pull force of positioning rod 2 and the reaction force of lower eccentric swing rod 52 form a torque balance at backrest shaft 301. The lower eccentric swing rod 52 moves to the left, causing the left eccentric sleeve 10 to rotate clockwise. The left eccentric sleeve 10 and the right eccentric sleeve 11 rotate synchronously: the clockwise rotation of the left eccentric sleeve 10 pushes the inflection point of the curved rod 4 downward through the first connecting rod 6. The downward movement of the inflection point of the curved rod 4 drives the right eccentric sleeve 11 to rotate synchronously clockwise. The left rubber cylinder 12 and the right rubber cylinder 13 move inward, the distance between the rubber cylinders is reduced, and the printing pressure is increased.

[0070] When the printing pressure needs to be reduced, the digital hand wheel 1 is rotated, the positioning rod 2 moves right, and the free end of the backrest 3 swings right.

[0071] The lower eccentric swing rod 52 moves right, driving the left eccentric sleeve 10 to rotate counterclockwise. The counterclockwise rotation of the left eccentric sleeve 10 pulls the inflection point of the curved rod 4 upward through the first connecting rod 6. The upward movement of the inflection point of the curved rod 4 drives the right eccentric sleeve 11 to rotate counterclockwise synchronously. The left rubber cylinder 12 and the right rubber cylinder 13 move outward, the spacing increases, and the printing pressure decreases.

[0072] S3, during the decompression process, the piston rod of the cylinder 9 extends: the piston rod of the cylinder 9 extends. The transmission operation clutch pressure shaft 7 is pushed upward. The bent rod 4 and the right eccentric sleeve 11 rotate counterclockwise: the transmission operation clutch pressure shaft 7 moves upward, driving the inflection point of the bent rod 4 to move upward synchronously. The upward movement of the inflection point pushes the right eccentric sleeve 11 to rotate counterclockwise through the second connecting rod 8. The right eccentric sleeve 11 rotates counterclockwise: when the right eccentric sleeve 11 rotates counterclockwise, the lower eccentric swing rod 52 swings to the right. The upper eccentric swing rod 51 is pulled by the first connecting rod 6 to drive the left eccentric sleeve 10 to rotate counterclockwise. The left eccentric sleeve 10 and the right eccentric sleeve 11 rotate counterclockwise: the left eccentric sleeve 10 and the right eccentric sleeve 11 rotate counterclockwise.

[0073] The left rubber cylinder 12 and the right rubber cylinder 13 move outward around the left eccentric axis and the right eccentric axis respectively, the distance between the rubber cylinders increases, and the printing pressure is released.

[0074] S4, the tensioning process of the rubber blanket 14: the worm 17 and the worm wheel 18 drive: the worm 17 drives the worm wheel 18 to rotate by rotating, so as to realize the forward and reverse movement of the reel and control the winding and tension of the rubber blanket 14.

[0075] The free end of the rubber blanket 14 reel is installed in the fixed groove 19 of the reel. Ensure that the rubber blanket 14 always maintains appropriate tension during the printing process to avoid printing quality problems caused by relaxation or over-tightening.

[0076] Embodiment 1, in this embodiment, the specific parameters and connection relationship of each structure are as follows:

[0077] The cylinder 9 is connected to the transmission operation clutch pressure shaft 7 through the second connecting rod 8. The piston rod of the cylinder 9 is extended and retracted to drive the transmission operation clutch pressure shaft 7 to move up and down along the axial direction (stroke range ±15mm). The top of the upper crankshaft 4 is hinged to the second connecting rod 8 (the hinge point diameter is φ10mm). The bottom end of the lower crankshaft 4 is fixedly connected to the right eccentric sleeve 11 (the connection pin shaft tolerance is H7 / g6). It is hinged to the first connecting rod 6 at the inflection point (swing angle range ±25°).

[0078] The rotation center of the left eccentric sleeve 10 is the left eccentric axis 101 (eccentricity e=3.5±0.005 mm), which is eccentrically connected to the left rubber cylinder axis 121 (the eccentric direction angle is 15°).

[0079] The rotation center of the right eccentric sleeve 11 is the right eccentric axis 111 (eccentricity e=3.5±0.005 mm), which is eccentrically connected to the right rubber cylinder axis 131 (eccentric direction angle 15°).

[0080] The top of the upper eccentric swing rod 51 is connected to the left eccentric sleeve 10 by a key (key width 8mm, matching tolerance JS7 / h6), and is connected to the inflection point of the curved rod 4 through the first connecting rod 6 (connecting rod length L=120±0.1mm).

[0081] The bottom of the lower eccentric swing rod 52 contacts the right side of the free end of the backrest 3 (contact pressure 200±10N), and the middle part is spline-connected with the right eccentric sleeve 11 (module 1.5, number of teeth 24).

[0082] The positioning rod 2 adopts a precision ball screw (lead 2mm, accuracy grade C3), each rotation of the digital handwheel 1 corresponds to a screw displacement of 2mm, the scale resolution is 0.01mm, and it is connected to the left side of the free end of the backrest 3 with a ball head (ball diameter φ6mm, matching clearance ≤0.02mm).

[0083] The diameter of the backing shaft 301 is φ25mm (surface hardness HRC58-62), the free end swing angle range is ±8°; the module of the worm 17 is 1.0, the number of heads is 3 (lead angle 15°), the number of teeth of the worm wheel 18 is 45 (radial runout ≤0.03mm); the diameter of the reel is φ50mm (surface hard chrome plated, thickness 0.05mm).

[0084] Structural parameters of the gap opening 20: maximum radius difference ΔR=15%R (ΔR=11.25mm when R=75mm), gradient angle α=8° ("eight" opening angle).

[0085] The closing pressure time is ≤0.8s (when the pressure of cylinder 9 is 0.6MPa).

[0086] The mechanism achieves a printing pressure adjustment range of 0.1-1.5mm (corresponding to paper thickness 30-350g / m) through the above-mentioned precision mechanical connection relationship. 2 ); Pressure repeatability positioning accuracy ±0.003mm; Dynamic adjustment response time ≤0.3s / 0.1mm displacement; Maximum bearing pressure 1500N / cm 2 (System safety factor ≥3).

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure adjustment mechanism for a rubber cylinder of a rotary printing press, characterized in that: It includes: The cylinder (9) and the transmission operation clutch pressure shaft (7) are connected via a second connecting rod (8), and the cylinder (9) and the transmission operation clutch pressure shaft (7) provide power for the clutch pressure operation and the clutch pressure operation; A backrest (3), the lower part of which is rotatably connected to the backrest shaft (301), and the upper part of which is a free end; The positioning rod (2) is connected to the digital hand wheel (1), the left end of the positioning rod (2) is connected to the digital hand wheel (1), and the right end is connected to the left side of the free end of the backrest (3); the positioning rod (2) provides rightward pressure for the free end of the backrest (3); The bent rod (4) is provided with an upper bent rod (4) and a lower bent rod (4), and the connection point is an inflection point; the upper end of the upper bent rod (4) is hinged to the second connecting rod (8), and the lower end of the lower bent rod (4) is connected to the right eccentric sleeve (11); The eccentric swing rod comprises an upper eccentric swing rod (51) and a lower eccentric swing rod (52); the upper eccentric swing rod (51) is arranged above the left eccentric sleeve (10), and the upper eccentric swing rod (51) is hinged to the inflection point of the bent rod (4) through a first connecting rod (6); the bottom of the lower eccentric swing rod (52) is connected to the right side of the free end of the backrest (3), providing leftward pressure for the free end of the backrest (3); The eccentric sleeve comprises a left eccentric sleeve (10) and a right eccentric sleeve (11); the rotation center of the left eccentric sleeve (10) is the left eccentric axis (101), and the rotation center of the right eccentric sleeve (10) is the right eccentric axis (111); A rubber roller, with a rubber cloth (14) wound around the outside of the rubber roller; the rubber roller comprises a left rubber roller (12) and a right rubber roller (13), which are eccentrically connected to a left eccentric sleeve (10) and a right eccentric sleeve (11), respectively, and the axis (121) of the left rubber roller is located on the left side of the left eccentric axis (101), and the axis (131) of the right rubber roller is located on the right side of the right eccentric axis (111).

2. The pressure adjustment mechanism for the rubber cylinder of a rotary printing press according to claim 1, characterized in that: The rubber rollers are all provided with a gap opening (20), the radius of which is smaller than the outer circumference radius of the rubber roller and gradually decreases to form an "eight" shape, and the difference between the gap opening (20) and the maximum radius of the rubber roller is 15% of the radius of the rubber roller.

3. The pressure adjustment mechanism for the rubber cylinder of a rotary printing press according to claim 1, characterized in that: A rubber cloth (14) tensioning mechanism is also provided, comprising a worm wheel (18) and a worm (17); the worm wheel (18) is directly connected to the reel of the rubber cloth (14) and is used to drive the reel to rotate and control the winding and tension of the rubber cloth (14); the worm (17) drives the worm wheel (18) to rotate by rotating, thereby realizing the forward and reverse movement of the reel; a fixing groove (19) is provided in the rubber cylinder, and the free end of the reel of the rubber cloth (14) is installed in the fixing groove (19) of the reel.

4. The pressure adjustment mechanism for the blanket cylinder of a rotary printing press according to claim 1, characterized in that: A left rubber cylinder (15) and a right rubber cylinder (16) are also provided, which are respectively connected to the left rubber cylinder (12) and the right rubber cylinder (13) in pressure contact and cooperate with the rubber cylinders to realize printing.

5. The pressure adjustment mechanism for the blanket cylinder of a rotary printing press according to claim 1, characterized in that: The included angle between the upper curved rod (4) and the lower curved rod (4) is greater than 90°.

6. The pressure regulating mechanism for the blanket cylinder of a rotary printing press according to claim 1, characterized in that: The positioning rod (2) is a lead screw structure, and the digital hand wheel (1) is provided with a proportional scale matching the lead screw pitch. The rotation number scale of the digital hand wheel (1) accurately corresponds to the displacement of the positioning rod (2) and the printing pressure value between the rubber rollers.

7. A method for adjusting the pressure of a blanket cylinder of a rotary printing press using a blanket cylinder pressure adjustment mechanism according to any one of claims 1 to 6, characterized in that: It includes the following steps: S1, the closing process, after the printing press receives the closing signal, the cylinder (9) contracts, and drives the transmission operation clutch pressing shaft (7) to move downward through the second connecting rod (8), thereby driving the curved rod (4) and the right eccentric sleeve (11) to rotate clockwise, and finally causing the left rubber roller (12) and the right rubber roller (13) to move inward, forming printing pressure; the bottom of the lower eccentric swing rod (52) provides leftward pressure for the free end of the backrest (3); S2, dynamic pressure adjustment process, by rotating the digital hand wheel (1) to control the left and right movement of the positioning rod (2), thereby adjusting the position of the backrest (3) and the lower eccentric swing rod (52), driving the rotation direction of the left eccentric sleeve (10) and the right eccentric sleeve (11), realizing the reduction or increase of the distance between the left rubber roller (12) and the right rubber roller (13), and adjusting the increase or decrease of the printing pressure; S3, during the release process, the piston rod of the air cylinder (9) extends, pushing the transmission operation clutch pressure shaft (7) upward, driving the bent rod (4) and the right eccentric sleeve (11) to rotate counterclockwise, causing the left rubber cylinder (12) and the right rubber cylinder (13) to move outward, thereby releasing the printing pressure.

8. The method according to claim 7, characterized in that The specific process of step S1 includes: S1, during the closing process, the printing press receives the closing signal, and the cylinder (9) starts to retract; the piston rod of the cylinder (9) pulls the transmission operation clutch pressing shaft (7) downward through the second connecting rod (8), causing it to move downward along the axis, driving the inflection point of the bent rod (4) to move downward synchronously, and the downward inflection point applies a clockwise rotation torque to the right eccentric sleeve (11) through the second connecting rod (8), and the power is amplified; the pulling of the second connecting rod (8) causes the right eccentric sleeve (11) to rotate clockwise around its fixed axis; The rotation of the right eccentric sleeve (11) drives the lower eccentric swing rod (52) to swing leftward, and transmits power to the upper eccentric swing rod (51) through the first connecting rod (6); the upper eccentric swing rod (51) receives the thrust of the first connecting rod (6) and drives the left eccentric sleeve (10) to rotate clockwise; when the left eccentric sleeve (10) and the right eccentric sleeve (11) rotate clockwise synchronously, the left rubber roller (12) and the right rubber roller (13) move inward around the left eccentric axis and the right eccentric axis, and the distance between the two rubber rollers is reduced, thereby forming printing pressure. At the same time, the bottom of the lower eccentric swing rod (52) provides leftward pressure to the free end of the backing (3) from the right side of the free end of the backing (3).

9. The method according to claim 7, characterized in that: The specific process of step S2 includes: S2, dynamic pressure adjustment process, when it is necessary to reduce the distance between the left rubber roller (12) and the right rubber roller (13): S21, rotating the digital hand wheel (1), converting the rotational motion into a leftward linear displacement of the positioning rod (2) through the lead screw; when the positioning rod (2) moves to the left, the free end of the backrest (3) swings to the left; when the backrest (3) swings, the push-pull force of the positioning rod (2) and the reaction force of the lower eccentric swing rod (52) form a torque balance at the backrest shaft (301); at the same time, the lower eccentric swing rod (52) moves to the left, causing the left eccentric sleeve (10) to rotate clockwise; the clockwise rotation of the left eccentric sleeve (10) pushes the inflection point of the curved rod (4) to move downward through the first connecting rod (6); the downward movement of the inflection point of the curved rod (4) drives the right eccentric sleeve (11) to rotate clockwise synchronously; the left rubber roller (12) and the right rubber roller (13) move inward, the spacing is reduced, and the printing pressure is increased; When the distance between the left rubber roller (12) and the right rubber roller (13) needs to be reduced: S22, rotate the digital hand wheel (1), the positioning rod (2) moves right, the free end of the backrest (3) swings right, and at the same time, the lower eccentric swing rod (52) moves right, driving the left eccentric sleeve (10) to rotate counterclockwise; the left eccentric sleeve (10) rotates counterclockwise, pulling the turning point of the curved rod (4) upward through the first connecting rod (6); the turning point of the curved rod (4) moves upward, driving the right eccentric sleeve (11) to rotate counterclockwise synchronously; the left rubber roller (12) and the right rubber roller (13) move outward, the spacing increases, and the printing pressure decreases proportionally.

10. The method according to claim 7, characterized in that The specific process of step S3 includes: S3, during the depressing process, the piston rod of the air cylinder (9) extends, pushing the transmission operation clutch pressure shaft (7) upward, driving the bending rod (4) inflection point to move upward synchronously; the inflection point moves upward, pushing the right eccentric sleeve (11) to rotate counterclockwise through the second connecting rod (8); when the right eccentric sleeve (11) rotates counterclockwise, the lower eccentric swing rod (52) swings to the right, and pulls the upper eccentric swing rod (51) through the first connecting rod (6), driving the left eccentric sleeve (10) to rotate counterclockwise; the left eccentric sleeve (10) and the right eccentric sleeve (11) rotate counterclockwise, and the left rubber roller (12) and the right rubber roller (13) move outward around the left eccentric axis and the right eccentric axis respectively, the distance between the rubber rollers increases, and the printing pressure is released.

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