High-precision preparation and conversion system for offset printing fountain solution

Abstract

The invention discloses an offset printing fountain solution high-precision preparation and conversion system which adopts a liquid flow pulse sensor to monitor liquid flow in real time, a PLC (programmable logic controller) dynamically adjusts the extraction amount of a peristaltic pump of a stepping motor according to the number of pulses, and the matching precision is controlled within + / -0.1% by an error compensation algorithm, so that the problem of concentration deviation caused by viscosity is thoroughly solved; particularly, the harsh requirements of alcohol-free fountain solution, cold-set ink quick-drying and other special liquid medicines are met; a mechanical sealing structure is replaced by full-electronic control, worn parts are eliminated, the service life is matched with that of a printing host, and the after-sale cost is reduced; through cooperation of the double-three-way electric control valve and the liquid drainage set, automatic switching of two kinds of liquid medicine is rapidly completed under the instruction of the PLC touch screen, the device is suitable for continuous operation of a high-speed printing production line, and the efficiency and environmental protection performance of batch printing of textbooks and the like are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of 8-color book rotary cold-set ink fast-drying dampening device, in particular to a high-precision preparation and conversion system for offset dampening solution. BACKGROUND

[0002] In the offset printing process, the accurate preparation of dampening solution is crucial to maintaining ink balance. Traditional dampening solution automatic preparation systems mostly use hydraulic differential siphon principle (such as American AQUA-BLEND, French Doshu, etc.), which realizes preparation by extracting concentrated solution through negative pressure. This kind of system is suitable for non-adhesive liquid solution (such as alcohol dampening solution), but has significant defects in alcohol-free dampening solution scenarios: alcohol-free dampening solution has a certain viscosity, which leads to a siphon extraction error of up to ± 50%, and the actual concentration may deviate from the set value (such as 3%) by 2%-4%. This lack of accuracy seriously damages ink balance and affects printing quality. In addition, the mechanical seal structure (sealing ring, sealing ball) of the existing system has a service life of only about 6 months, while the service life of the printing main machine is up to 20 years. Frequent replacement of spare parts not only increases after-sales costs, but also leads to unstable printing effect of the main equipment, which restricts the promotion of supporting equipment.

[0003] For the requirement of multiple liquid switching, the existing technology completely relies on manual operation. In the high-speed continuous printing scene (such as 8-color rotary machine), manual conversion takes too long to meet the production rhythm, especially for special processes such as cold-set ink fast-drying that require immediate switching of liquid.

[0004] Therefore, an integrated system with high-precision preparation (error ≤ 1 ‰) and automatic double-liquid switching capability is needed to solve the three core problems of precision defects, insufficient mechanical life, and low switching efficiency. SUMMARY

[0005] The purpose of the present application is to provide a high-precision preparation and conversion system for offset dampening solution to solve the problems existing in the prior art.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] The present application provides a high-precision preparation and conversion system for offset dampening solution, comprising:

[0008] A function box is provided with a box door on the front side;

[0009] An automatic dampening solution preparation assembly is arranged in the function box;

[0010] An automatic dampening solution switching assembly is arranged in the function box;

[0011] A PLC is arranged on the side wall of the functional box, and the automatic dampening solution proportioning assembly and the automatic dampening solution switching assembly are electrically connected with the PLC.

[0012] Preferably, the functional box is a stainless steel box.

[0013] Preferably, the automatic dampening solution proportioning assembly comprises a first liquid inlet pipeline and a first liquid outlet pipeline, the first liquid inlet pipeline and the first liquid outlet pipeline are respectively communicated with the liquid inlet end and the liquid outlet end of a peristaltic pump, the first liquid inlet pipeline is provided with a liquid inlet electromagnetic valve switch, a liquid flow pulse sensor is arranged between the first liquid outlet pipeline and the peristaltic pump, and the peristaltic pump, the liquid inlet electromagnetic valve switch and the liquid flow pulse sensor are electrically connected with the PLC.

[0014] Preferably, the peristaltic pump is a step motor peristaltic pump.

[0015] Preferably, the automatic dampening solution switching assembly comprises a second liquid inlet pipeline and a second liquid outlet pipeline, the second liquid inlet pipeline and the second liquid outlet pipeline are respectively communicated with the liquid inlet end and the liquid outlet end of a liquid discharge group, the second liquid inlet pipeline is connected with one interface of a first three-way electric control valve, the second liquid outlet pipeline is connected with one interface of a second three-way electric control valve, the other two interfaces of the first three-way electric control valve are respectively connected with a first dampening solution liquid inlet branch pipe and a second dampening solution liquid inlet branch pipe, the other two interfaces of the second three-way electric control valve are respectively connected with a first dampening solution liquid return branch pipe and a second dampening solution liquid return branch pipe, and the first three-way electric control valve and the second three-way electric control valve are electrically connected with the PLC.

[0016] Preferably, the liquid discharge group is a double-row eight-channel liquid discharge group.

[0017] Preferably, the liquid inlet end and the liquid outlet end of the liquid discharge group are respectively provided with an L-shaped electromagnetic valve, and the L-shaped electromagnetic valve is electrically connected with the PLC.

[0018] Preferably, the PLC is provided with a touch screen, and the touch screen is arranged on the outer surface of the functional box.

[0019] The present application has the following beneficial technical effects compared with the prior art:

[0020] The offset dampening solution high-precision preparation and conversion system provided by the present application synchronously breaks through the precision and switching efficiency bottleneck through pulse counting closed-loop control and electronic three-way valve group integrated design.

[0021] Improved precision: A liquid flow pulse sensor (225 pulses / liter) monitors liquid flow in real time. The PLC dynamically adjusts the pumping volume of the stepper motor peristaltic pump based on the pulse count. An error compensation algorithm controls the ratio accuracy within ±1‰, completely solving the concentration deviation problem caused by viscosity. This is especially effective for meeting the stringent requirements of specialty liquids such as alcohol-free fountain solutions and cold-setting inks.

[0022] Extended service life: The mechanical seal structure is replaced by full electronic control (solenoid valve, pulse sensor, stepper motor), eliminating wear parts, matching the service life with the printing host, and reducing after-sales costs;

[0023] Efficient Switching: Through the coordination of the dual three-way electric control valve and the liquid displacement group, the automatic switching between two liquid chemicals (such as quick-drying type and paper powder removal type) is quickly completed under the instructions of the PLC touch screen. This adapts to the continuous operation of high-speed printing production lines and significantly improves the efficiency and environmental friendliness of batch printing of textbooks. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the structure of the high-precision preparation and conversion system for offset printing fountain solution provided by the present invention;

[0026] Figure 2 A schematic structural diagram of the automatic fountain solution proportioning component in the offset fountain solution high-precision preparation and conversion system provided by the present invention;

[0027] Figure 3 This is a schematic structural diagram of the automatic fountain solution switching component in the offset fountain solution high-precision preparation and conversion system provided by the present invention;

[0028] In the figure: 1: functional box, 11: box door, 2: fountain solution automatic proportioning component, 21: first liquid inlet pipe, 22: first liquid outlet pipe, 23: peristaltic pump, 24: liquid inlet solenoid valve switch, 25: liquid flow pulse sensor, 3: fountain solution automatic switching component, 31: second liquid inlet pipe, 32: second liquid outlet pipe, 33: first three-way electric control valve, 34: second three-way electric control valve, 35: first fountain solution upper liquid branch pipe, 36: second fountain solution upper liquid branch pipe, 37: first fountain solution return liquid branch pipe, 38: second fountain solution return liquid branch pipe, 39: liquid discharge group, 310: L-type solenoid valve, 4: PLC. DETAILED DESCRIPTION

[0029] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "liquid level", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher liquid level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower liquid level than the second feature.

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The purpose of the present invention is to provide a high-precision preparation and conversion system for offset printing fountain solution to solve the problems existing in the prior art.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1:

[0035] This embodiment provides a high-precision offset printing fountain solution preparation and conversion system. Figure 1 Shown, including:

[0036] The functional box 1 is made of stainless steel, which is sturdy and durable. Its dimensions can be 800 mm in length, 250 mm in width, and 600 mm in height. A door 11 is provided on the front side.

[0037] PLC4, PLC4 is provided with a touch screen, and the touch screen is arranged on the outer surface of the functional box 1.

[0038] The existing offset printing fountain solution automatic dispensers all use the hydraulic differential siphon principle to automatically extract the fountain solution. They are only used to extract non-viscous liquid solutions. However, for most alcohol-free fountain solutions with a certain viscosity, the extraction error is more than 50%, which seriously affects the fountain solution's fountain effect. For example, the negative pressure extraction accuracy of the fountain solution is ±1%, the hydraulic pressure is 1 to 5 kg, and the fountain solution is set to 3%, which may actually be 2% to 4%. The extraction error of the liquid concentration is too large, resulting in a large difference in the efficacy of the fountain solution ink balance. In addition, the life of the sealing ring and the sealing ball of the above-mentioned equipment is about 6 months. For the supporting equipment with a life of 20 years for the main printing equipment, the too short service life causes the main equipment worth millions of dollars to have unstable printing effects, and the after-sales cost of the supporting equipment is high, which is not conducive to the promotion of the supporting equipment. In this regard, the present embodiment provides an automatic fountain solution proportioning component 2 in the functional box 1. Specifically, Figure 2 As shown:

[0039] The automatic proportioning component 2 of the dampening solution includes a first liquid inlet pipe 21 and a first liquid outlet pipe 22, which are respectively used for extracting and discharging the dampening concentrate. Both can be made of plastic hoses. The first liquid inlet pipe 21 and the first liquid outlet pipe 22 are respectively connected to the liquid inlet end and the liquid outlet end of the peristaltic pump 23. In this embodiment, the peristaltic pump 23 adopts an integrated stepper motor peristaltic pump with a flow range of 0-1800ml / min, a rated power of 40W, and a service life of over 6000h. The first liquid inlet pipe 21 is provided with a liquid inlet solenoid valve switch 24, and a liquid flow pulse sensor 25 is provided between the first liquid outlet pipe 22 and the peristaltic pump 23. The peristaltic pump 23, the liquid inlet solenoid valve switch 24 and the liquid flow pulse sensor 25 are all electrically connected to PLC4.

[0040] After the liquid inlet solenoid valve switch 24 is turned on, the dampening liquid enters under the extraction of the peristaltic pump 23, and the flowing liquid triggers the liquid flow pulse sensor 25 to emit 225 pulses / liter. After receiving the pulse signal through the high-speed counter of PLC4, a logical operation is performed to transmit the corresponding number of pulses to the stepper motor of the peristaltic pump 23. According to the proportional difference between the actual extracted liquid and the first logical operation, the pulse number is compensated within the error of ±1‰ and output to the stepping pulse peristaltic pump, thereby controlling the peristaltic pump to accurately extract the liquid until the actual liquid concentration reaches the requirement.

[0041] This embodiment uses a liquid flow pulse sensor to monitor the liquid flow in real time. The PLC dynamically adjusts the extraction volume of the stepper motor peristaltic pump according to the number of pulses. The error compensation algorithm is used to control the ratio accuracy within ±1‰, which completely solves the concentration deviation problem caused by viscosity, and especially meets the stringent requirements of special liquids such as alcohol-free fountain solution and cold-setting ink quick-drying. At the same time, this embodiment replaces the mechanical sealing structure with a fully electronically controlled solenoid valve, pulse sensor, and stepper motor to eliminate wear parts, match the service life with the printing host, and reduce after-sales costs.

[0042] Example 2:

[0043] This embodiment provides a high-precision offset printing fountain solution preparation and conversion system. Figure 1 and 3 As shown, in this embodiment, a fountain solution automatic switching component 3 is provided in the functional box 1 .

[0044] When switching between two different fountain solutions in existing equipment, the switching is generally done manually, which takes a long time and is not suitable for rapid switching in high-speed continuous printing production. In this regard, this embodiment 1 effectively solves the above problem by providing an automatic fountain solution switching component 3. Specifically:

[0045] The dampening liquid automatic switching component 3 includes a second liquid inlet pipe 31 and a second liquid outlet pipe 32, which are respectively used for extracting and discharging the dampening concentrate. Both can be made of plastic hoses. The second liquid inlet pipe 31 and the second liquid outlet pipe 32 are connected to the liquid inlet end and the liquid outlet end of the liquid discharge group 39 respectively. The liquid discharge group 39 adopts a double-row eight-channel liquid discharge, that is, it has eight liquid inlets and eight liquid outlets, which supply water and return water to the 8-color offset printing machine, and the liquid inlet end and the liquid outlet end are both provided with an L-shaped solenoid valve 310, which is electrically connected to the PLC4. The second liquid inlet pipe 31 is connected to the first three-way electronic control One interface of the valve 33 is connected, the second liquid outlet pipe 32 is connected to an interface of the second three-way electric-controlled valve 34, which is used for switching between the two fountain solutions. The other two interfaces of the first three-way electric-controlled valve 33 are respectively connected to the first fountain solution upper liquid branch 35 and the second fountain solution upper liquid branch 36, which are used for the inlet of the two fountain solutions. The other two interfaces of the second three-way electric-controlled valve 34 are respectively connected to the first fountain solution return liquid branch 37 and the second fountain solution return liquid branch 38, which are used for the return of the two fountain solutions. The first three-way electric-controlled valve 33 and the second three-way electric-controlled valve 34 are both electrically connected to PLC4.

[0046] During use, one of the fountain solutions normally enters the second liquid inlet pipe 31 through the first fountain solution upper liquid branch 35, passes through the second liquid outlet pipe 32 through the liquid discharge group 39, and finally enters the device through the first fountain solution return branch 37. When the second fountain solution needs to be switched, the corresponding switching button is selected on the touch screen of the PLC, and the first three-way electric control valve 33 and the second three-way electric control valve 34 switch the path, and the second fountain solution upper liquid branch 36 and the second fountain solution return branch 38 are connected, thereby completing automatic switching. When the fountain solution returns, the principle is the same, but the path is opposite.

[0047] Through the coordination of the double three-way electric control valve and the liquid displacement group, the automatic switching between two liquids, such as quick-drying type and paper powder removal type, can be quickly completed under the instructions of the PLC touch screen. This adapts to the continuous operation of high-speed printing production lines and significantly improves the efficiency and environmental friendliness of batch printing of textbooks.

[0048] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] It should be noted that the components mentioned in the above embodiments are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0050] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A high-precision offset printing fountain solution preparation and conversion system, characterized by: include: A functional box (1), wherein a box door (11) is provided on the front side of the functional box (1); An automatic fountain solution proportioning component (2), the automatic fountain solution proportioning component (2) being arranged in the functional box (1); A fountain solution automatic switching component (3), the fountain solution automatic switching component (3) being arranged in the functional box (1); A PLC (4) is provided on the side wall of the functional box (1); the fountain solution automatic proportioning component (2) and the fountain solution automatic switching component (3) are both electrically connected to the PLC (4).

2. The high-precision offset printing fountain solution preparation and conversion system according to claim 1, characterized in that: The functional box (1) is made of stainless steel.

3. The high-precision offset printing fountain solution preparation and conversion system according to claim 1, characterized in that: The fountain solution automatic proportioning component (2) comprises a first liquid inlet pipe (21) and a first liquid outlet pipe (22), wherein the first liquid inlet pipe (21) and the first liquid outlet pipe (22) are respectively connected to the liquid inlet end and the liquid outlet end of a peristaltic pump (23), the first liquid inlet pipe (21) is provided with a liquid inlet solenoid valve switch (24), a liquid flow pulse sensor (25) is provided between the first liquid outlet pipe (22) and the peristaltic pump (23), and the peristaltic pump (23), the liquid inlet solenoid valve switch (24) and the liquid flow pulse sensor (25) are all electrically connected to the PLC (4).

4. The high-precision offset printing fountain solution preparation and conversion system according to claim 3, characterized in that: The peristaltic pump (23) is a stepper motor peristaltic pump.

5. The high-precision offset printing fountain solution preparation and conversion system according to claim 1, characterized in that: The dampening liquid automatic switching component (3) comprises a second liquid inlet pipe (31) and a second liquid outlet pipe (32), the second liquid inlet pipe (31) and the second liquid outlet pipe (32) being connected to the liquid inlet end and the liquid outlet end of the liquid discharge group (39) respectively, the second liquid inlet pipe (31) being connected to an interface of the first three-way electric control valve (33), the second liquid outlet pipe (32) being connected to an interface of the second three-way electric control valve (34), the other two interfaces of the first three-way electric control valve (33) being connected to the first dampening liquid upper liquid branch pipe (35) and the second dampening liquid upper liquid branch pipe (36), the other two interfaces of the second three-way electric control valve (34) being connected to the first dampening liquid return liquid branch pipe (37) and the second dampening liquid return liquid branch pipe (38), the first three-way electric control valve (33) and the second three-way electric control valve (34) being electrically connected to the PLC (4).

6. The high-precision offset printing fountain solution preparation and conversion system according to claim 5, characterized in that: The liquid displacement group (39) adopts a double-row eight-channel liquid displacement.

7. The high-precision offset printing fountain solution preparation and conversion system according to claim 5, characterized in that: The liquid inlet and outlet ends of the liquid discharge group (39) are both provided with L-shaped solenoid valves (310), and the L-shaped solenoid valves (310) are electrically connected to the PLC (4).

8. The high-precision offset printing fountain solution preparation and conversion system according to claim 1, characterized in that: The PLC (4) is provided with a touch screen, and the touch screen is arranged on the outer surface of the functional box (1).

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