Automatic control system for water-ink balance of offset press

Abstract

The utility model discloses an automatic ink-ink balance control system of an offset press. The automatic ink-ink balance control system comprises a fountain solution circulation loop, the fountain solution circulation loop comprises a water bucket, a first water pump, an offset press water tank, a filter unit, a detection unit and a second water pump which are sequentially connected end to end; the filtering unit is configured to be used for purifying the fountain solution; the detection unit is configured to be used for detecting the quality of the fountain solution; the detection unit is connected with a control unit; before a fountain solution supply link, the fountain solution is purified through the filtering unit, and the quality of the fountain solution is detected through the detection unit, so that the quality of the fountain solution is ensured, and the reliability of water film thickness detection is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to offset printing technical field especially is related to a offset press water ink balance automatic control system. BACKGROUND

[0002] Offset printing is the principle of using ink and water incompatible, so that ink and water exist on the plate at the same time and keep each other balance, realize the copy of figure and text. Therefore, control water ink balance is the key to ensure the quality of offset printing.

[0003] The most important factor affecting water ink balance is the quality of ink and water, usually the quality of ink is relatively stable, can calculate the use amount of ink in advance in the pre-press link, carry out the accurate preset of ink amount, and the quality of water is easy to be affected by various factors and change with the printing, leading to the change of its conductivity, surface tension, PH value, thereby breaking the water ink balance, causing the printing quality problem.

[0004] Such as the announcement number for CN203305638U's Chinese patent, discloses a kind of offset press water ink balance automatic control device, illumination light source and the light sensor of receiving the reflection of illumination light source on printing plate are arranged on the inner wall of printing machine, printing plate cylinder top, and light sensor is connected with offset press wetting device, by detecting the light flux of reflected light, and compared with standard value to determine the state of water ink balance, system is automatically adjusted water quantity according to feedback signal.

[0005] However, the dirt problem of dampening solution affects the accuracy of water film thickness detection, and further affects the control of water ink balance. UTILITY MODEL CONTENT

[0006] The utility model aims at overcoming the above-mentioned shortcoming, provide a kind of offset press water ink balance automatic control system, can be purified to dampening solution before dampening solution supply link, the quality of dampening solution is detected by detection unit, to ensure the quality of dampening solution, improve the reliability of water film thickness detection.

[0007] To achieve the above object, the specific scheme of the utility model is as follows:

[0008] A kind of offset press water ink balance automatic control system, including dampening solution circulation loop;The dampening solution circulation loop includes water bucket, first water pump, offset press water tank, filtration unit, detection unit and second water pump sequentially and tail to tail connection;The filtration unit is configured to purify dampening solution;The detection unit is configured to detect the quality of dampening solution;The detection unit is connected with control unit.

[0009] Preferably, further comprising a printing plate arranged on the plate cylinder, an inking roller arranged above the printing plate, and a fountain roller arranged above the fountain, and an infrared laser emitter and an infrared laser receiver arranged on the wallboard of the printing machine; a plurality of water application rollers are arranged between the fountain roller and the printing plate; the infrared laser emitter is configured to emit an infrared laser signal to the printing plate; and the infrared laser receiver is configured to receive the infrared laser signal reflected from the printing plate.

[0010] Preferably, the infrared laser emitter is configured to emit an infrared laser signal X and an infrared laser signal Y to the printing plate.

[0011] Preferably, the wavelength of the infrared laser signal X is 2.4-2.6 μm; and the wavelength of the infrared laser signal Y is 2.8-3.5 μm.

[0012] Preferably, the incident angle a of the infrared laser signal X and the infrared laser signal Y is 70°-88°.

[0013] Preferably, the infrared laser receiver is provided with a polarized correction lens.

[0014] Preferably, the infrared laser receiver is connected with a signal processing unit.

[0015] Preferably, the detection unit comprises a PH value detection element, a surface tension detection element, a temperature detection element, and a conductivity detection element.

[0016] Preferably, the filter unit purifies the dampening solution by a physical method.

[0017] The utility model discloses a beneficial effect is: the utility model discloses a filter unit and detection unit are established in dampening solution circuit, thereby can purify dampening solution through filter unit before dampening solution supply link, through detection unit to the quality of dampening solution is detected, thereby ensure the quality of dampening solution, improve the reliability of water film thickness detection. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram of the utility model discloses a beneficial effect is:

[0019] Figure 2 Indicate that the absorption spectrum of aqueous solution is in the infrared wave band;

[0020] Mark the legend: 11, fountain; 12, first water pump; 13, offset printing machine water tank; 14, filter unit; 15, detection unit; 16, second water pump; 17, control unit; 2, plate cylinder; 21, printing plate; 3, inking roller; 4, fountain roller; 5, infrared laser emitter; 6, infrared laser receiver; 61, signal processing unit; 7, water application roller. DETAILED DESCRIPTION

[0021] The utility model will be further explained in detail below in combination with the drawings and specific embodiments, and is not limited to the embodiment range of the utility model.

[0022] As Figure 1 Indicated, a water and ink balance automatic control system of offset press of the embodiment, including fountain solution circulation loop, the fountain solution circulation loop includes the water bucket 11, first water pump 12, offset press water tank 13, filter unit 14, detection unit 15 and second water pump 16 that are connected in proper order, the filter unit 14 is configured to be used for the purification of fountain solution, the detection unit 15 is configured to be used for the detection of fountain solution quality, the detection unit 15 is connected with control unit 17.

[0023] Specifically, as Figure 1 Indicated, a water and ink balance automatic control system of offset press of the embodiment, in the working of offset press, first water pump 12 extracts fountain solution in water bucket 11, and makes fountain solution pass through offset press water tank 13, filter unit 14, detection unit 15 in proper order, then by second water pump 16 is sent back in water bucket 11, to form the circulation of fountain solution, wherein, when fountain solution passes through filter unit 14, filter unit 14 purifies fountain solution to purify the impurities such as ink, organic solvent, particulate matter in fountain solution, after the purification of fountain solution, detection unit 15 detects the quality of fountain solution in real time, and the detection result is fed back to control unit 17, control unit 17 is PLC controller, if the detection result deviates from the preset value, control unit 17 sends warning signal to remind the operator to handle, to ensure that the quality of fountain solution is always in the optimal state.

[0024] The embodiment is by setting filter unit 14 and detection unit 15 in fountain solution loop, so that before the fountain solution supply link, the quality of fountain solution is ensured, and the reliability of water film thickness detection is improved by purifying fountain solution through filter unit 14 and detecting the quality of fountain solution through detection unit 15.

[0025] As Figure 1 Indicated, a water and ink balance automatic control system of offset press of the embodiment, in some embodiments, still includes the plate 21 of being located in the plate cylinder 2, the inking roller 3 of being located above the plate 21 and the water bucket roller 4 of being located above the water bucket 11, and the infrared laser transmitter 5 and infrared laser receiver 6 of being located in the wallboard of printing machine, a plurality of water rollers 7 are arranged between the water bucket roller 4 and the plate 21, the infrared laser transmitter 5 is configured to emit infrared laser signal to the plate 21, and the infrared laser receiver 6 is configured to receive the infrared laser signal reflected from the plate 21.

[0026] Specifically, the water-ink balance automatic control system of the offset printing machine in the embodiment can, in actual use, transfer the fountain solution with required quality in the water bucket 11 to the printing plate 21 through the water roller 4 and the water roller 7, so as to wet the printing plate 21 and form a water film on the blank part of the surface of the printing plate 21, and the inking roller 3 inks the graphic part of the printing plate 21, at this time, the fountain solution on the blank part and the graphic part of the printing plate 21 reaches a dynamic balance state.

[0027] Meanwhile, the infrared laser emitter 5 emits infrared laser signals to the printing plate 21, the printing plate 21 reflects the infrared laser signals, and the reflected infrared laser signals are received by the infrared laser receiver 6, so that the water film thickness on the printing plate 21 can be obtained according to the received infrared laser signals, and the obtained water film thickness is compared with the preset standard value, so that the state of the water film balance on the printing plate 21 can be judged, and the judgment result is sent to the printing machine industrial computer, the printing machine industrial computer controls the rotating speed of the first fountain solution transfer roller according to the judgment result, so that the increase or decrease of the fountain solution supply is realized, and the automatic control of the water-ink balance is realized.

[0028] The water-ink balance automatic control system of the offset printing machine in the embodiment, in some embodiments, the infrared laser emitter 5 is configured to emit infrared laser signals X and infrared laser signals Y to the printing plate 21. Specifically, in the embodiment, the wavelength of the infrared laser signal X is 2.4-2.6 μm, and the wavelength of the infrared laser signal Y is 2.8-3.5 μm.

[0029] In actual use, as shown in Figure 2 The infrared laser emitter 5 emits the infrared laser signals X and the infrared laser signals Y to the printing plate 21 at the same time, due to the absorption characteristics of the fountain solution to the infrared light, the fountain solution water film on the printing plate 21 hardly absorbs the infrared laser signals X, and obviously absorbs the infrared laser signals Y, after reflection through the printing plate 21, the reflected signals X and the reflected signals Y are formed, the infrared laser receiver 6 receives the reflected signals X and the reflected signals Y, and then the infrared light intensity absorbed by the water film can be obtained according to the difference between the reflected signals X and the reflected signals Y, so that the water film thickness on the printing plate 21 can be obtained, and the accuracy of the water film detection is improved, so as to accurately control the water-ink balance.

[0030] Specifically, the water film thickness can be calculated according to the following formula: in(io / i)=k·b·c; wherein io is the incident intensity, i is the transmitted light intensity, k is a constant, b is the water film thickness, and c is the water solution density, wherein i can be directly measured by the sensor. The light intensity of the infrared laser signal Y and the infrared laser signal X emitted by the fixed light source has a certain proportional relationship, and through this proportional relationship, the light intensity of the reflected infrared laser signal X band can be measured to deduce the incident light intensity of the infrared laser signal Y band, that is, the value of io. The calculation formula of the light intensity is I=Nhv / At, wherein I represents the light intensity in optics, v represents the frequency of light, h represents the Planck constant, A is the irradiation area, and N is the total number of photons irradiated on A within the time interval t; c can be measured by a liquid densimeter, that is, k and c are known, and the water film thickness b can be calculated.

[0031] As shown in Figure 1 In some embodiments of the water ink balance automatic control system of the offset press, the incident angles a of the infrared laser signal X and the infrared laser signal Y are both 70°-88°. In this way, the signal strength received by the infrared laser receiver 6 can be effectively improved to ensure the accuracy of water film detection.

[0032] In some embodiments of the water ink balance automatic control system of the offset press, the infrared laser receiver 6 is provided with a polarized correction lens (not shown in the figure). In this embodiment, the polarized correction lens is used to filter out unnecessary noise when receiving signals, which is beneficial to improve the accuracy of water film detection.

[0033] As shown in Figure 1 In some embodiments of the water ink balance automatic control system of the offset press, the infrared laser receiver 6 is connected with a signal processing unit 61. Specifically, in actual use, the infrared laser receiver 6 transmits the reflected signal X and the reflected signal Y received to the signal processing unit 61, the signal processing unit 61 amplifies the reflected signal X and the reflected signal Y, compares the amplified reflected signal X and the reflected signal Y, and obtains the infrared light absorption value. After A / D conversion processing, the water film thickness on the plate 21 can be obtained. Comparing the obtained water film thickness with the preset standard value can determine the state of the water ink balance on the plate 21, and the determination result can be sent to the printing machine industrial computer, so as to realize the automatic control of the water ink balance.

[0034] The offset printing machine water-ink balance automatic control system of the embodiment, in some embodiments, the detection unit 15 includes a PH value detection element (not shown in the figure), a surface tension detection element (not shown in the figure), a temperature detection element (not shown in the figure) and a conductivity detection element (not shown in the figure). Through the above setting, the main quality of the dampening solution can be detected in real time, so as to ensure the quality of the dampening solution and improve the reliability of the water film thickness detection.

[0035] The offset printing machine water-ink balance automatic control system of the embodiment, in some embodiments, the filter unit 14 adopts a physical method to purify the dampening solution; so that the ink, organic solvent, particulate matter and other impurities in the dampening solution can be recycled and purified, without affecting the original composition and properties of the dampening solution.

[0036] The above is only a preferred embodiment of the present application, so equivalent changes or modifications made in accordance with the structure, features and principles described in the patent application of the present application are included in the protection scope of the patent application of the present application.

Claims

1. An automatic control system for water ink balance of an offset printing machine, characterized in that, The dampening solution circulation loop comprises a water bucket, a first water pump, a water tank of the offset printing machine, a filtering unit, a detection unit and a second water pump connected in sequence.

2. An automatic water-ink balance control system for an offset printing press according to claim 1, wherein The dampening solution circulation loop further comprises a printing plate arranged on the plate cylinder, an inking roller arranged above the printing plate, a water bucket roller arranged above the water bucket, an infrared laser emitter and an infrared laser receiver arranged on the wall plate of the printing machine, and a plurality of water application rollers arranged between the water bucket roller and the printing plate.

3. The automatic water-ink balance control system of a web offset press according to claim 2, wherein, The infrared laser emitter is configured to emit infrared laser signals X and Y to the printing plate.

4. The automatic water-ink balance control system of a web offset press according to claim 3, wherein, The wavelength of the infrared laser signal X is 2.4-2.6 μm, and the wavelength of the infrared laser signal Y is 2.8-3.5 μm.

5. The automatic water-ink balance control system of a web offset press according to claim 4, wherein, The incident angles α of the infrared laser signals X and Y are both 70°-88°.

6. The automatic water-ink balance control system of a web offset press according to claim 2, wherein, The infrared laser receiver is provided with a polarized correction lens.

7. The automatic water-ink balance control system of a web offset press according to claim 2, wherein, The infrared laser receiver is connected with a signal processing unit.

8. The automatic water-ink balance control system of claim 1, wherein, The detection unit comprises a PH value detection element, a surface tension detection element, a temperature detection element and a conductivity detection element.

9. The automatic water-ink balance control system of claim 1, wherein, The filtering unit purifies the dampening solution by a physical method.

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