Eccentric bushing device for stabilizing blanket cylinder of rotary press

Abstract

The utility model relates to the technical field of rotary press eccentric bushings, and provides a rotary press stable blanket cylinder eccentric bushing device which comprises an operation side wall plate, a transmission side wall plate, an eccentric bushing assembly, a hydraulic unit and the like. The hydraulic unit converts gas pressure into hydraulic pressure through the gas-liquid pressurizer, the hydraulic unit is driven to abut against or release the eccentric sleeve, and pressure combination and pressure separation are achieved. The clutch air cylinder is matched with the electromagnetic valve to accurately control rotation of the eccentric sleeve. The pressure regulating valve ensures hydraulic stability, and the one-way valve prevents hydraulic backflow. The device is reasonable in structure, jumping caused by thermal expansion of the eccentric sleeve is effectively avoided, printing stability and efficiency are improved, production delay is reduced, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of offset sleeves of rotary printing presses, and particularly relates to a stable blanket cylinder offset sleeve device for a rotary printing press. Background Art

[0002] As an efficient printing device, one of the core working principles of a rotary printing press is to change the central position of the printing cylinder by rotating the offset sleeve. This change mechanism enables the printing cylinder to be in close contact with the impression cylinder during the printing process, that is, to reach the impression state. The stability of the impression state directly determines the printing stability and quality. When the offset sleeve rotates to a specific position, the center lines of the printing cylinder and the impression cylinder are aligned, and a uniform contact pressure is formed between them, ensuring that the graphic can be accurately transferred to the printed material.

[0003] Before the printing starts, the offset sleeve will rotate to a suitable position according to a preset program or operation instruction, so that the printing cylinder is in close contact with the impression cylinder. This process is called impression, and it is a key step to ensure printing quality and stability. When a printing task is completed or the printing plate needs to be replaced, the printing cylinder needs to change from the impression state to a non-contact state for plate replacement, cleaning or other maintenance operations. This process is called off-impression. To achieve off-impression, a mechanism is needed to generate enough clearance between the offset sleeve and the wallboard to allow the printing cylinder to move freely.

[0004] During the actual operation of the rotary printing press, the high-speed rotation of the bearings will generate a large amount of heat, which will cause the internal materials of the printing press to expand and contract thermally. For the offset sleeve, its diameter will increase after being heated and expanded, and then the clearance between it and the wallboard hole will decrease. This reduction in clearance may, in extreme cases, cause the offset sleeve to fail to separate smoothly when off-impression is required, that is, the problem of inability to achieve off-impression occurs. The inability to achieve off-impression will directly affect the plate-changing efficiency and overall working performance of the rotary printing press. Because if the printing plate cannot be replaced in time, the printing press will not be able to continue to perform new printing tasks, resulting in production delays and increased costs.

[0005] To solve the problem of the offset sleeve being unable to achieve off-impression, the existing technology mainly adopts the method of increasing the clearance between the offset sleeve and the wallboard hole. By reserving a larger clearance at the design stage to ensure that there is still enough space for the offset sleeve to move during off-impression. However, although this method can alleviate the problem of inability to achieve off-impression to a certain extent, it also brings new challenges. An excessive clearance may cause the cylinder to jump during the printing process, thereby affecting printing quality and stability. For example, cylinder jumping may cause printing defects such as bars and ghosting, reducing the quality of printed products.

[0006] Therefore, how to ensure the smooth release of the eccentric sleeve while avoiding the drum bounce has become an urgent technical problem to be solved. Summary of the Invention

[0007] To solve the problems existing in the background technology, the present utility model provides a stable offset sleeve device for a rotary printing press rubber drum, which includes:

[0008] An operator side wallboard and a drive side wallboard, an offset sleeve assembly is installed between the operator side wallboard and the drive side wallboard, the offset sleeve assembly includes an offset sleeve and a pressing piece, and the offset sleeve is rotatably connected to the wallboard holes of the operator side wallboard and the drive side wallboard through the pressing piece;

[0009] A hydraulic unit, the hydraulic unit includes:

[0010] A number of hydraulic unit components connected to the offset sleeve, and the hydraulic unit components extend or retract under hydraulic action to hold or release the offset sleeve;

[0011] A gas-liquid intensifier, the gas-liquid intensifier is connected to a gas source through an air pipe, used to convert the pressure of the gas into hydraulic pressure, and is connected to the hydraulic unit components through a hydraulic pipe to drive the action of the hydraulic unit components;

[0012] A clutch cylinder, electrically connected to solenoid valve one and / or solenoid valve two, used to drive the clutch link to swing under the control of the solenoid valve, and then drive the offset sleeve to rotate to achieve clutch;

[0013] A pressure regulating valve, arranged on the hydraulic output path of the gas-liquid intensifier, used to adjust the hydraulic output pressure to ensure that the hydraulic unit components apply a stable force to the offset sleeve;

[0014] A one-way valve, arranged on the hydraulic pipe, used to control the one-way flow of hydraulic pressure and prevent hydraulic pressure from flowing back.

[0015] Preferably, the hydraulic unit is provided with a hydraulic circuit, wherein:

[0016] The hydraulic circuit includes a hydraulic pipe, a hydraulic unit component and a gas-liquid intensifier; the hydraulic pipe connects the gas-liquid intensifier and the hydraulic unit component to form a hydraulic transmission channel; during the impression process, the gas-liquid intensifier converts the gas pressure into hydraulic energy, transmits it to the hydraulic unit component through the hydraulic pipe, and drives the hydraulic unit component to extend to hold the offset sleeve and fix it stably on the wallboard.

[0017] Preferably, the hydraulic unit is provided with a release circuit, wherein:

[0018] The low-pressure circuit includes solenoid valve II, check valve, hydraulic unit components, gas-liquid booster and possible connection parts of the clutch-pressure cylinder; solenoid valve II and the check valve control the flow direction of gas or liquid; during the low-pressure process, solenoid valve II responds to the low-pressure signal and opens, allowing gas to return to the gas-liquid booster through the check valve. At the same time, the hydraulic energy in the hydraulic unit components is released, the hydraulic unit components retract, and the fixing force on the eccentric sleeve is released, enabling the eccentric sleeve to rotate smoothly to achieve low pressure.

[0019] Preferably, the hydraulic unit is provided with a pressure-on circuit, where:

[0020] The pressure-on circuit includes solenoid valve I, pressure regulating valve, gas-liquid booster and hydraulic unit components; solenoid valve I and the pressure regulating valve jointly control the inflow of gas and the generation of hydraulic pressure; after receiving the pressure-on signal, solenoid valve I opens, allowing gas to enter the gas-liquid booster, which is converted into hydraulic energy after being regulated by the pressure regulating valve and transmitted to the hydraulic unit components through a hydraulic pipe, driving them to extend and hold against the eccentric sleeve to complete the pressure-on action.

[0021] The beneficial effects achieved by the present utility model are as follows:

[0022] The overall structure design of the offset press stable blanket cylinder eccentric sleeve device of the present utility model is reasonable, effectively solving problems such as the inability of the eccentric sleeve to smoothly release pressure and drum jumping existing in the prior art, and significantly improving the stability and working efficiency of the printing press, specifically manifested as follows:

[0023] First, by adding fixed hydraulic unit components on the circumference of the eccentric sleeve in the present utility model, the eccentric sleeve is fixed at a fixed position on the wallboard during printing, effectively avoiding the jumping problem caused by the thermal expansion of the eccentric sleeve, and ensuring the stability and quality of printing.

[0024] Second, the present utility model designs a control system for the clutch-pressure cylinder and solenoid valves. Through the precise control of the solenoid valves, the clutch-pressure cylinder drives the eccentric sleeve to rotate, ensuring both the flexibility during pressure release and the improvement of the printing press's plate changing and working efficiency.

[0025] Third, the present utility model uses a gas-liquid booster to efficiently convert the pressure of gas into hydraulic pressure and transmits it to the hydraulic unit components through a hydraulic pipe to achieve stable force application to the eccentric sleeve. This technology not only improves the energy conversion efficiency but also ensures the stability and accuracy of force application.

[0026] Fourth, a pressure regulating valve is provided in the hydraulic component of the present utility model, which can adjust the hydraulic output pressure to ensure that the hydraulic unit applies a stable force to the eccentric sleeve. This design effectively avoids printing quality problems caused by pressure fluctuations and improves the stability and consistency of printing. A one-way valve is provided on the hydraulic pipe to control the one-way flow of the hydraulic pressure and prevent hydraulic backflow. This measure ensures the stability and reliability of the hydraulic system and avoids mechanical failures and safety hazards caused by hydraulic backflow. Brief Description of the Drawings

[0027] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0028] Figure 2 is a schematic diagram of the structure of the hydraulic component;

[0029] Figure 3 is a schematic diagram of the structure of the eccentric sleeve assembly;

[0030] Figure 4 is Figure 3 a sectional view taken along the C-C direction in

[0031] Reference numerals in the drawings:

[0032] 1, hydraulic component; 101, hydraulic line; 102, high-pressure line; 103, impression line; 11, hydraulic unit; 12, air-liquid intensifier; 13, impression cylinder; 14, pressure regulating valve; 15, one-way valve; 16, solenoid valve I; 17, solenoid valve II; 2, air pipe; 3, hydraulic pipe; 4, oil cylinder; 5, impression connecting rod; 6, eccentric sleeve assembly; 61, pressing plate; 62, eccentric sleeve; 63, operator side wallboard; 64, drive side wallboard. Detailed Description of the Preferred Embodiment

[0033] Next, the technical solutions in the present utility model will be clearly and completely described with reference to the accompanying drawings in the present utility model. In addition, the forms of each structure described in the following embodiments are merely examples, and the present utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0034] Referring to Figures 1 - 4 , the present utility model provides a device for stabilizing the eccentric sleeve 62 of a rotary printing press rubber cylinder, which includes:

[0035] An operator side wallboard 63 and a drive side wallboard 64, an eccentric sleeve 62 assembly 66 is installed between the operator side wallboard 63 and the drive side wallboard 64. The eccentric sleeve 62 assembly 66 includes an eccentric sleeve 62 and a pressing plate 61. The eccentric sleeve 62 is rotationally connected to the wallboard holes of the operator side wallboard 63 and the drive side wallboard 64 through the pressing plate 61;

[0036] A hydraulic unit, the hydraulic unit includes a plurality of hydraulic unit components 11 connected to an oil cylinder 4 and an eccentric sleeve 62, the hydraulic unit components 11 extending or retracting under the hydraulic pressure of the oil cylinder 4 to support or release the eccentric sleeve 62;

[0037] A gas-liquid booster 12, which is connected to a gas source via a gas pipe 2, and is used to convert the gas pressure into hydraulic pressure, and is connected to the hydraulic unit 11 via a hydraulic pipe 3, so as to drive the action of the hydraulic unit 11;

[0038] The clutch pressure cylinder 13 is electrically connected to the solenoid valve 16 and / or the solenoid valve 2 17, and is used to drive the clutch pressure connecting rod 5 to swing under the control of the solenoid valve, and then drive the eccentric sleeve 62 to rotate to achieve clutch pressure;

[0039] The pressure regulating valve 14 is arranged on the hydraulic output path of the gas-liquid booster 12 and is used to adjust the hydraulic output pressure to ensure that the hydraulic unit 11 applies a stable force to the eccentric sleeve 62;

[0040] The one-way valve 15 is arranged on the hydraulic pipe 3 to control the one-way flow of hydraulic pressure and prevent hydraulic backflow.

[0041] The hydraulic unit is provided with a hydraulic circuit 101, wherein the hydraulic circuit 101 includes a hydraulic pipe 3, a hydraulic unit component 11 and a gas-liquid booster 12; the hydraulic pipe 3 connects the gas-liquid booster 12 and the hydraulic unit component 11 to form a hydraulic transmission channel; during the pressurization process, the gas-liquid booster 12 converts the gas pressure into hydraulic energy, which is transmitted to the hydraulic unit component 11 through the hydraulic pipe 3, driving the hydraulic unit component 11 to extend, support the eccentric sleeve 62, and stabilize it on the wall panel.

[0042] The hydraulic unit is provided with a decompression circuit 102, wherein the decompression circuit 102 includes a solenoid valve 17, a one-way valve 15, a hydraulic unit component 11, a gas-liquid booster 12 and a possible connection part of a clutch pressure cylinder 13; the solenoid valve 17 and the one-way valve 15 control the flow direction of the gas or liquid; during the decompression process, the solenoid valve 17 opens in response to the decompression signal, allowing the gas to return to the gas-liquid booster 12 through the one-way valve 15, and at the same time, the hydraulic energy in the hydraulic unit component 11 is released, the hydraulic unit component 11 retracts, and the fixing force on the eccentric sleeve 62 is released, so that the eccentric sleeve 62 can rotate smoothly to achieve decompression.

[0043] The hydraulic unit is provided with a pressure - closing circuit 103, where the pressure - closing circuit 103 includes solenoid valve 16, pressure - regulating valve 14, air - liquid intensifier 12 and hydraulic unit component 11; solenoid valve 16 and pressure - regulating valve 14 jointly control the inflow of gas and the generation of hydraulic pressure; after receiving the pressure - closing signal, solenoid valve 16 opens, allowing gas to enter air - liquid intensifier 12, which is regulated by pressure - regulating valve 14 and then converted into hydraulic energy, and is transmitted to hydraulic unit component 11 through hydraulic pipe 3 to drive it to extend and press against eccentric sleeve 62, completing the pressure - closing action.

[0044] The utility model can achieve precise and stable control of pressure - closing and pressure - releasing through an intelligent control system and efficient air - liquid boosting technology. Through the coordinated operation of key components such as hydraulic unit component 11, air - liquid intensifier 12, pressure - regulating valve 14, check valve 15 and clutch - pressure cylinder 13, the offset sleeve 62 device of the rotary printing machine's stable rubber cylinder can efficiently and reliably complete printing tasks. The specific steps of the pressure - closing process are described as follows:

[0045] The eccentric sleeve 62 assembly 66 has been installed between the operation - side wallboard 63 and the drive - side wallboard 64, and the eccentric sleeve 62 is rotatably connected to the wallboard hole through a pressing piece 61. The hydraulic unit component 11 is in an initial state and does not apply a fixing force to the eccentric sleeve 62.

[0046] When receiving the pressure - closing signal, solenoid valve 16 acts first, opening the gas passage to allow gas to enter air - liquid intensifier 12.

[0047] After the gas enters air - liquid intensifier 12, it is regulated by pressure - regulating valve 14 and converted into stable hydraulic energy. The pressure - regulating valve 14 ensures that the output hydraulic pressure is stable to adapt to different working requirements.

[0048] The hydraulic energy is transmitted to hydraulic unit component 11 through hydraulic pipe 3, driving hydraulic unit component 11 to extend. Hydraulic unit component 11 presses against eccentric sleeve 62, making it stably fixed on the wallboard, reaching the pressure - closing state.

[0049] During this process, the clutch - pressure cylinder 13 may perform a retraction action under the control of the solenoid valve to provide auxiliary support for the stable fixation of the eccentric sleeve 62.

[0050] The specific steps of the pressure - releasing process are described as follows:

[0051] When receiving the pressure - releasing signal, solenoid valve 17 responds and opens, and at the same time solenoid valve 16 may also participate in the control process.

[0052] When solenoid valve 17 opens, it allows gas to return to air - liquid intensifier 12 through check valve 15, realizing the reverse flow of gas. The check valve 15 ensures that the hydraulic pressure does not flow back, guaranteeing the stability of the system.

[0053] As the gas returns to the gas-liquid booster 12, the hydraulic energy in the hydraulic unit 11 is gradually released. The hydraulic unit 11 retracts, releasing the fixing force on the eccentric sleeve 62 and enabling it to rotate freely.

[0054] The clutch cylinder 13 drives the clutch link 5 to swing under the control of the solenoid valve, and then drives the eccentric sleeve 62 to rotate. When the eccentric sleeve 62 rotates to an appropriate position, the off-pressure is achieved and the printing cylinder is separated from the impression cylinder.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for stabilizing an eccentric sleeve (62) of a rubber cylinder of a rotary printing press, characterized in that: It includes: An operating side wall plate (63) and a transmission side wall plate (64), an eccentric sleeve (62) assembly (6) is installed between the operating side wall plate (63) and the transmission side wall plate (64), the eccentric sleeve (62) assembly (6) comprising an eccentric sleeve (62) and a pressing sheet (61), the eccentric sleeve (62) being rotatably connected to the wall plate holes of the operating side wall plate (63) and the transmission side wall plate (64) via the pressing sheet (61); A hydraulic assembly (1), the hydraulic assembly (1) comprising: A plurality of hydraulic unit components (11) connected to the eccentric sleeve (62), wherein the hydraulic unit components (11) extend or retract under the action of hydraulic pressure to support or release the eccentric sleeve (62); A gas-liquid booster (12), the gas-liquid booster (12) being connected to a gas source via an air pipe (2) and used for converting gas pressure into hydraulic pressure, and being connected to the hydraulic unit (11) via a hydraulic pipe (3) to drive the hydraulic unit (11) to operate; The clutch pressure cylinder (13) is electrically connected to the solenoid valve 1 (16) and / or the solenoid valve 2 (17), and is used to drive the clutch pressure connecting rod (5) to swing under the control of the solenoid valve, thereby driving the eccentric sleeve (62) to rotate to achieve clutch pressure; A pressure regulating valve (14) is arranged on the hydraulic output path of the gas-liquid booster (12) and is used to adjust the hydraulic output pressure to ensure that the hydraulic unit (11) applies a stable force to the eccentric sleeve (62); The one-way valve (15) is arranged on the hydraulic pipe (3) and is used to control the one-way flow of hydraulic pressure and prevent hydraulic backflow.

2. The device for stabilizing the eccentric sleeve (62) of the rubber cylinder of a rotary printing press according to claim 1, characterized in that: The hydraulic unit is provided with a hydraulic circuit (101), wherein: The hydraulic circuit (101) comprises a hydraulic pipe (3), a hydraulic unit component (11) and a gas-liquid booster (12); the hydraulic pipe (3) connects the gas-liquid booster (12) and the hydraulic unit component (11) to form a hydraulic transmission channel; during the pressurization process, the gas-liquid booster (12) converts gas pressure into hydraulic energy, which is transmitted to the hydraulic unit component (11) through the hydraulic pipe (3), driving the hydraulic unit component (11) to extend and support the eccentric sleeve (62), so that it is stably fixed on the wall panel.

3. The device for stabilizing the eccentric sleeve (62) of the rubber cylinder of a rotary printing press according to claim 1, characterized in that: The hydraulic unit is provided with a pressure-release circuit (102), wherein: The decompression circuit (102) comprises a second solenoid valve (17), a one-way valve (15), a hydraulic unit (11), a gas-liquid booster (12) and a possible connection part of a decompression cylinder (13); the second solenoid valve (17) and the one-way valve (15) control the flow direction of gas or liquid; during the decompression process, the second solenoid valve (17) opens in response to a decompression signal, allowing gas to return to the gas-liquid booster (12) through the one-way valve (15), while at the same time, the hydraulic energy in the hydraulic unit (11) is released, the hydraulic unit (11) retracts, and the fixing force on the eccentric sleeve (62) is released, so that the eccentric sleeve (62) can rotate smoothly to achieve decompression.

4. The device for stabilizing the eccentric sleeve (62) of the rubber cylinder of a rotary printing press according to claim 1, characterized in that: The hydraulic unit is provided with a pressure-combining circuit (103), wherein: The pressure-closing circuit (103) comprises a solenoid valve (16), a pressure regulating valve (14), a gas-liquid booster (12) and a hydraulic unit (11); the solenoid valve (16) and the pressure regulating valve (14) jointly control the inflow of gas and the generation of hydraulic pressure; after receiving a pressure-closing signal, the solenoid valve (16) opens, allowing gas to enter the gas-liquid booster (12), which is converted into hydraulic energy after being regulated by the pressure regulating valve (14), and is transmitted to the hydraulic unit (11) through the hydraulic pipe (3), driving the hydraulic unit (11) to extend and press against the eccentric sleeve (62), thereby completing the pressure-closing action.

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