Method for using a gravure printing in-line concave-convex device with high pressure release synchronicity

Abstract

The application discloses a method for using a gravure printing line concave-convex device with high off-press synchronization, which comprises the following steps: hoisting a printing plate roller to a printing plate roller clamping groove on a fixed sliding block and a sliding sliding block, and fixing the printing plate roller; starting a first hydraulic oil cylinder and a second hydraulic oil cylinder; when the concave-convex roller is combined and pressed, an elongation oil cavity of the first hydraulic oil cylinder starts to inject oil, a first electromagnetic valve is opened, a second electromagnetic valve remains closed, and hydraulic oil flows into a shortening oil cavity of the second hydraulic oil cylinder through a first pipeline; when the concave-convex roller is separated, the shortening oil cavity of the first hydraulic oil cylinder starts to inject oil, the second electromagnetic valve is opened, the first electromagnetic valve remains closed, and hydraulic oil flows into the elongation oil cavity of the second hydraulic oil cylinder through a second pipeline; off-press work of the concave-convex roller is completed; and the elongation of the first hydraulic oil cylinder and the shortening of the second hydraulic oil cylinder are synchronized, so that the problem of poor off-press synchronization of the concave-convex printing plate roller caused by different action forces borne by the sliding sliding block is avoided.

Description

[0001] This application is a divisional application of application number CN202111366419.5, entitled "An Intaglio Printing Connecting Embossing Device and Its Usage Method", filed on November 18, 2021. Technical Field

[0002] This invention relates to the field of printing equipment technology, and in particular to a method of using a gravure printing inline embossing device with high pressure synchronization. Background Technology

[0003] Embossing is an important post-printing process, a printing method that does not use ink. It is used for post-printing finishing of printed materials such as labels, cigarette packs, cartons, greeting cards, and bottle labels, giving them a vivid and aesthetically pleasing three-dimensional effect and increasing the depth of the printed design. The embossing mechanism includes a gravure die (such as a gravure roller) and a relief die (such as a relief roller). The gravure and relief dies correspond to each other; during embossing, the substrate is placed between them, and significant pressure is applied to create the raised or recessed image. Embossing after gravure printing is a common post-printing processing method.

[0004] Some existing gravure printing machines often apply pressure from one side and have anti-spring discs between the embossing and debossing rollers to achieve roller reset. However, one-sided pressure leads to an imbalance between the pressing and separating pressures, which can result in poor synchronization of the depressing and debossing rollers, hindering effective depressing. For example, the gravure inline embossing workstation with application number 201420843859.4 discloses in its specific implementation that "a lower meshing gear 6 is provided at the right end of the lower shaft 4 of the concave platform, which meshes with an upper meshing gear 5, and the upper meshing gear 5 is located on the concave platform." The upper shaft 3 is located at the right end; the upper meshing gear 5 is fixed on the upper slider 9, and the lower meshing gear 6 is fixed on the lower slider 10. A counter-spring disc 11 is provided between the upper slider 9 and the lower slider 10. When the upper shaft 3 and the lower shaft 4 of the concave platen are pressed together and separated, the upper pressure device of the printing roller directly uses air pressure to press down the upper shaft 3 of the concave platen during pressing, and the spring force of the counter-spring disc 11 can lift up the upper shaft 3 of the concave platen during releasing pressure, thus achieving the separation function. However, this technical solution, being a typical case of unilateral pressure application, suffers from poor synchronization of the pressure release operation of the concave and convex printing rollers. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a gravure printing inline embossing device and its usage method that offers good synchronization of the pressure disengagement operation of the embossing roller.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a gravure printing inline embossing device, including a frame and a support base mounted on the frame. A fixed slider and a sliding slider are mounted on the support base. Both the fixed slider and the sliding slider have printing roller slots for gravure printing. The support base has a longitudinal groove for the sliding slider to reciprocate. One side of the sliding slider is connected to the output end of a first hydraulic cylinder. A second hydraulic cylinder is mounted in the longitudinal groove. The output end of the second hydraulic cylinder is connected to the other side of the sliding slider. Both the first and second hydraulic cylinders are connected to a hydraulic pump station. The extension chamber of the first hydraulic cylinder is connected to the shortening chamber of the second hydraulic cylinder via a first pipeline. A first solenoid valve is mounted on the first pipeline. The shortening chamber of the first hydraulic cylinder is connected to the extension chamber of the second hydraulic cylinder via a second pipeline. A second solenoid valve is mounted on the second pipeline.

[0007] Preferably, the frame is provided with a transverse sliding groove, and the supporting base is a movable sliding base plate located in the transverse sliding groove, the sliding base plate being connected to a transverse adjusting cylinder.

[0008] Preferably, a limiting rod is provided on the fixed slider, and the limiting rod restricts the lateral movement of the support base.

[0009] Preferably, the sliding slider is provided with a sliding roller.

[0010] Preferably, the ends of adjacent printing rollers are provided with meshing gears, and the gears are provided with protective covers.

[0011] Preferably, the hydraulic pump station includes an intermittent electric pump, a pressure display device, a control valve assembly, and a liquid nitrogen accumulator for pressurization.

[0012] Preferably, the pressure display device includes an electronic pressure gauge and a mechanical pressure gauge. The electronic pressure gauge displays the system pressure of the pump station, that is, the pressure before pressure reduction; the mechanical pressure gauge displays the working pressure of the workstation, that is, the pressure after pressure reduction.

[0013] Preferably, the control valve assembly includes a solenoid directional valve, a flow regulating valve, a relief valve, and a pressure reducing valve.

[0014] Preferably, a displacement sensor is provided on the support base, and the lateral adjustment cylinder stops working when the support base moves a preset length.

[0015] The present invention also provides a method of using the above-described gravure printing inline embossing device, comprising the following:

[0016] The printing plate roller is hoisted into the printing plate roller slot on the fixed slider and the sliding slider, and then fixed.

[0017] When the first and second hydraulic cylinders are activated, during the pressing operation of the concave and convex rollers, oil begins to enter the extended oil chamber of the first hydraulic cylinder, and the first solenoid valve is opened while the second solenoid valve remains closed. The hydraulic oil flows through the first pipeline to the shortened oil chamber of the second hydraulic cylinder. When the concave and convex rollers are separated, oil begins to enter the shortened oil chamber of the first hydraulic cylinder, and the second solenoid valve is opened while the first solenoid valve remains closed. The hydraulic oil flows through the second pipeline to the extended oil chamber of the second hydraulic cylinder.

[0018] Complete the depressurization process of the convex and concave rollers.

[0019] The present invention achieves the following beneficial effects compared to the prior art:

[0020] 1. The gravure printing inline embossing device provided by the present invention includes a first hydraulic cylinder and a second hydraulic cylinder respectively arranged on both sides of the sliding slider. Both the first and second hydraulic cylinders are connected to a hydraulic pump station. The extension chamber of the first hydraulic cylinder is connected to the shortening chamber of the second hydraulic cylinder through a first pipeline, and a first solenoid valve is provided on the first pipeline. The shortening chamber of the first hydraulic cylinder is connected to the extension chamber of the second hydraulic cylinder through a second pipeline, and a second solenoid valve is provided on the second pipeline. This ensures that the extension of the first hydraulic cylinder and the shortening of the second hydraulic cylinder are performed synchronously, avoiding the problem of poor synchronicity of the depressurization operation of the embossing printing roller caused by asynchronous forces on the sliding slider.

[0021] 2. The hydraulic pump station in the gravure printing inline embossing device provided by the present invention uses an intermittent electric pump to ensure that the pressure provided by the hydraulic pump station remains constant, while the motor cannot run continuously to avoid overheating and damage to the pump station. Therefore, a liquid nitrogen accumulator pressure replenishment design is adopted. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural diagram of the support base;

[0024] Figure 2 This is a schematic diagram of the frame structure;

[0025] Figure 3This is a schematic diagram of the hydraulic circuits of the first and second hydraulic cylinders.

[0026] Figure 4 For hydraulic pump stations;

[0027] Figure 5 This is a schematic diagram of the transmission structure;

[0028] Figure 6 This is a schematic diagram of a specific paper feeding path;

[0029] The components include: 1. Frame; 2. Support base; 3. Fixed slider; 4. Sliding slider; 5. Printing roller slot; 7. First hydraulic cylinder; 8. Second hydraulic cylinder; 9. Extension chamber of the second hydraulic cylinder; 10. Shortening chamber of the first hydraulic cylinder; 11. Extension chamber of the first hydraulic cylinder; 12. Extension chamber of the second hydraulic cylinder; 13. Gear; 14. Protective cover; 15. Transverse slide; 16. Transverse adjusting cylinder; 17. Limiting rod; 18. Sliding roller; 19. Printing roller; 20. Intermittent electric pump; 21. Electromagnetic directional valve; 22. Flow regulating valve; 23. Overflow valve; 24. Pressure reducing valve; and 25. Liquid nitrogen accumulator. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 6As shown, the present invention provides a gravure printing inline embossing device, including a frame 1 and a support base 2 mounted on the frame 1. The support base 2 is provided with a fixed slider 3 and a sliding slider 4. Both the fixed slider 3 and the sliding slider 4 are provided with printing roller slots 5 for gravure printing. The support base 2 is provided with a longitudinal groove for the sliding slider 4 to reciprocate. One side of the sliding slider 4 is connected to the output end of a first hydraulic cylinder 7. A second hydraulic cylinder 8 is provided in the longitudinal groove. The output end of the second hydraulic cylinder 8 is connected to the other side of the sliding slider 4. Both the first hydraulic cylinder 7 and the second hydraulic cylinder 8 are connected to a hydraulic pump station. The extension chamber 11 of the first hydraulic cylinder is connected to the shortening chamber 12 of the second hydraulic cylinder through a first pipeline. A first solenoid valve is provided on the first pipeline. The shortening chamber 10 of the first hydraulic cylinder is connected to the extension chamber 9 of the second hydraulic cylinder through a second pipeline. A second solenoid valve is provided on the second pipeline. In this invention, the output axes of the first hydraulic cylinder 7 and the second hydraulic cylinder 8 are in the same vertical plane, ensuring the stability of the applied force and avoiding the problem of force deviation. Specifically, the invention provides a first hydraulic cylinder 7 and a second hydraulic cylinder 8 on both sides of the sliding slider 4, and both are connected to a hydraulic pump station. The extension chamber 11 of the first hydraulic cylinder is connected to the shortening chamber 12 of the second hydraulic cylinder through a first pipeline, and a first solenoid valve is installed on the first pipeline. The shortening chamber 10 of the first hydraulic cylinder is connected to the extension chamber 9 of the second hydraulic cylinder through a second pipeline, and a second solenoid valve is installed on the second pipeline. This ensures that the extension of the first hydraulic cylinder 7 and the shortening of the second hydraulic cylinder 8 are performed synchronously, avoiding the problem of poor synchronization of the depressurization operation of the embossing roller due to asynchronous forces on the sliding slider 4. This ensures that the embossing roller automatically separates when the printing machine stops for dampening, and the paper is not torn.

[0033] In one specific implementation, the frame 1 of the present invention is provided with a transverse slide groove 15, and the supporting base 2 is a movable sliding base plate located in the transverse slide groove 15. The sliding base plate is connected to the transverse adjustment cylinder 16.

[0034] As a specific implementation method, in order to limit the displacement of the sliding base plate, a limiting rod 17 is provided on the fixed slider 3 in this invention, and the limiting rod 17 limits the lateral movement of the bearing base 2.

[0035] As a specific implementation method, in order to facilitate sliding, the sliding slider 4 in this invention is provided with a sliding roller 18.

[0036] As a specific implementation method, there is a safety hazard of mechanical injury at the gear meshing position. From the perspective of safety design, the ends of adjacent printing rollers 19 are provided with meshing gears 13, and the gears 13 are provided with protective covers 14 to prevent safety accidents from occurring.

[0037] In one specific implementation, the hydraulic pump station of the present invention includes an intermittent electric pump 20, a pressure display device, a control valve assembly, and a liquid nitrogen accumulator 25 for pressurization.

[0038] The pressure display device in this invention includes an electronic pressure gauge and a mechanical pressure gauge. The electronic pressure gauge displays the system pressure of the pump station, that is, the pressure before pressure reduction; the mechanical pressure gauge displays the working pressure of the workstation, that is, the pressure after pressure reduction.

[0039] The control valve assembly of the present invention includes an electromagnetic directional valve 21, a flow regulating valve 22, an overflow valve 23, and a pressure reducing valve 24.

[0040] In this invention, a displacement sensor is provided on the support base. When the support base moves a preset length, the lateral adjustment cylinder stops working, which makes the lateral displacement of the support base highly accurate and avoids the problem of inconvenient adjustment caused by poor displacement controllability. Furthermore, when the support base moves, the adjacent printing rollers are in a separated state.

[0041] The present invention also provides a method of using the above-mentioned gravure printing inline embossing device, comprising the following:

[0042] The printing plate roller is hoisted into the printing plate roller slot 5 on the fixed slider 3 and the sliding slider 4, and then fixed.

[0043] When the first hydraulic cylinder 7 and the second hydraulic cylinder 8 are activated, during the pressing operation of the concave and convex rollers, oil begins to enter the extension chamber 11 of the first hydraulic cylinder, and the first solenoid valve is opened while the second solenoid valve remains closed. The hydraulic oil flows through the first pipeline to the shortening chamber 12 of the second hydraulic cylinder. During the separating operation of the concave and convex rollers, oil begins to enter the shortening chamber 10 of the first hydraulic cylinder, and the second solenoid valve is opened while the first solenoid valve remains closed. The hydraulic oil flows through the second pipeline to the extension chamber 9 of the second hydraulic cylinder.

[0044] Complete the depressurization process of the convex and concave rollers.

[0045] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand this invention and its core ideas. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method of using a gravure printing in-line relief and gravure device with high off-press synchronization, characterized in that, The rack and the bearing base are provided with fixed sliding blocks and sliding sliding blocks, and the fixed sliding blocks and the sliding sliding blocks are provided with printing plate roller clamping grooves for intaglio printing. The printing plate roller is hoisted and fixed in the printing plate roller clamping grooves of the fixed sliding blocks and the sliding sliding blocks.

2. The method of using a gravure printing in-line relief and gravure device with high pressure relief synchronization according to claim 1, wherein The rack is provided with a transverse sliding groove, and the bearing base is a movable sliding base plate in the transverse sliding groove.

3. The method of using a gravure printing in-line relief and gravure device with high pressure relief synchronization according to claim 2, wherein The fixed sliding block is provided with a limiting rod.

4. The method of using a gravure printing in-line relief and gravure device with high pressure relief synchronization according to claim 3, wherein The sliding sliding block is provided with a sliding roller.

5. The method of using a gravure printing in-line relief and gravure device with high pressure relief synchronization according to claim 1, wherein The end portions of adjacent printing plate rollers are provided with meshing gears, and the gears are externally provided with protective covers.

6. The method of using a gravure printing in-line relief and gravure device with high pressure relief synchronization according to claim 1, wherein, The hydraulic pump station comprises an intermittent electric pump, a pressure display device, a control valve assembly and a liquid nitrogen accumulator for pressure compensation.

7. The method of using a gravure printing in-line relief and gravure device with high off-press synchronization according to claim 6, wherein The pressure display device comprises an electronic pressure gauge and a mechanical pressure gauge.

8. The method of using a gravure printing in-line relief and gravure device with high pressure relief synchronization according to claim 7, wherein The control valve assembly comprises an electromagnetic reversing valve, a flow regulating valve, an overflow valve and a pressure reducing valve.

9. The method of using a gravure printing in-line relief and gravure device with high pressure relief synchronization according to claim 2, wherein, The bearing base is provided with a displacement sensor. When the bearing base moves by a preset length, the transverse adjusting cylinder stops working.

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