CN2059131U - Surface roughening electric source for offset printing aluminium plate substrate - Google Patents

Abstract

The utility model discloses a surface roughening power supply device for lithographic printing aluminium plate base material. Two controlled silicon elements with different polarities and different voltage values are adopted. The two controlled silicon elements are respectively and are connected in parallel to form alternating current power supply after being triggered and conducted, wherein, the alternating current power supply, whose output is asymmetric and has discontinuity in the middle part, uses one output end to supply the power. Thus the structure of the power supply device can be simplified, and the manufacturing cost is reduced. The utility model can be used for plate-making and printing industry.

Description

Surface roughening electric source for offset printing aluminium plate substrate

The utility model discloses a kind of power-supply device that can carry out the electrochemical corrosion roughening treatment to flat stamping aluminium plate substrate surface.

At present, aluminium plate alligatoring both at home and abroad is to adopt to grind and the electrolytics corroding method substantially.In recent years, abroad introduced and used asymmetric AC power, solved the problem of the aluminium plate surface Grains structure difference of electrolytics etch existence, made printing quality that significant raising arranged.Yet this power-supply device needs very complicated alternating current-direct current inversion system circuit, no matter is from the manufacturing technology of high power contravariant element or the price of high power contravariant element, and domestic promoting the use of all exists sizable difficulty.Therefore, the flat stamping aluminium plate base material surface coarsening power-supply device that creates China oneself is vital to improving China's flat stamping plate-making technology and printing quality.

Invention task of the present utility model provides a kind of simple structure, functional, cheap lithographic printing aluminium plate base material surface coarsening power supply.

Figure of description 1 is a circuit diagram of the present utility model.

The utility model is that to have adopted be that a main transformer becomes city's electricity into low tension at least, utilize a tap one-way SCR rectification of the opposite polarity access element respectively of two different magnitudes of voltage of low-voltage secondary winding one end of main transformer, the output of these two controllable silicons is connected in parallel as common output end, designed again a triggering transformer identical with the main transformer phase place these two controllable silicons have been carried out the respectively triggering of positive-negative half-cycle, thereby Output obtains having between the different positive-negative half-cycle of positive-negative half-cycle amplitude the unsymmetrical AC source of interruption.

Following according to Figure of description, introduce formation of the present utility model in detail: lithographic printing aluminium plate base material surface coarsening power supply comprises main transformer B ₁, controllable silicon KP ₁, KP ₂With triggering power transformer B ₂Etc. formation, it is characterized in that at main transformer B ₁The tap of two different magnitudes of voltage of low-voltage secondary winding one end on the opposite polarity respectively controllable silicon KP that inserted ₁And KP ₂, KP ₁, KP ₂Output and be unified into a public output E, constitute output loop, KP with the other end F of low-voltage secondary winding ₁, KP ₂By triggering power transformer B ₂On two mutual discrete secondary windings L ₁, L ₂Triggering signal is provided respectively.This power supply is like this work: positive half cycle when trigger voltage reaches a certain value, controllable silicon KP ₂The conducting that is triggered forms voltage output; KP when negative half period begins ₂Turn-off, at this moment controllable silicon KP ₁Trigger voltage do not reach required value, KP as yet ₁Triggering and conducting not, when trigger voltage reaches a certain value, controllable silicon KP ₁The conducting that is triggered forms voltage output.Can obtain centre that the positive-negative half-cycle amplitude do not wait like this at output E place have the AC sine wave voltage output of interruption, i.e. the asymmetric AC power that will make of the utility model.What will emphatically point out here is: though for 1/4～1/10 of half wave cycles, solved controllable silicon KP the break time between the positive-negative half-cycle ₁, KP ₂Be connected with the short circuit that may cause in the same way, make the structure of power supply itself become very simple, thereby cost be quite low.Simultaneously, in experiment, find, the asymmetric alternating current of batch (-type) can guarantee that not only aluminium plate surface electrolysis produces good multilayer Grains structure, and can also utilize positive and negative aluminium ion and the hydrogen that the electrolytic aluminium surface is produced to break away from the aluminium surface, reduced grey matter, improve electrolysis usefulness, had good practicability.

Now, introduce an embodiment by Figure of description.Insert in the three-phase alternating-current supply respectively by three main transformers and three triggering power transformers among this embodiment, so that the mains supply balance.In the low-voltage secondary circle of three main transformers, insert the commutated network that is overlapped to form by two controllable silicons respectively, insert current transformer ZH at the silicon controlled output loop _1～6, ammeter A, overcurrent relay LJ _1～3With fastp-acting fuse RT _1～3At output E, F place through DPDT change-over switch K _1～3Insert voltmeter V so that observe the output voltage situation.Main transformer B is the power transformer of 220V/25V, 16V capacity 10KVA, triggers power transformer B ₂Be 220V/6～12V 20VA power transformer.Controllable silicon KP can adopt the one-way SCR element of the withstand voltage 800V of 500A.

Claims (4)

1, a kind of lithographic printing aluminium plate base material surface coarsening power supply comprises main transformer B ₁, controllable silicon KP ₁, KP ₂With triggering power transformer B ₂Etc. formation, it is characterized in that at main transformer B ₁The tap of two different magnitudes of voltage of low-voltage secondary winding one end on the opposite polarity respectively controllable silicon KP that inserted ₁, and KP ₂, KP ₁, KP ₂Output and be unified into a public output E, constitute output loop, KP with the other end F of low-voltage secondary winding ₁, KP ₂By triggering power transformer B ₂On two mutual discrete secondary windings L ₁, L ₂Triggering signal is provided respectively.

2,, it is characterized in that in the silicon controlled output loop, inserting current transformer ZH according to the described lithographic printing aluminium plate of claim 1 base material surface coarsening power supply _1～6, ammeter A, overcurrent relay LJ _1～3With fastp-acting fuse RT _1～3, at output E, F place through DPDT change-over switch K _1～3Insert voltmeter V.

3, according to the described lithographic printing aluminium plate of claim 1 base material surface coarsening power supply, it is characterized in that main transformer B ₁Be the power transformer of 220V/25V, 16V capacity 10KVA, trigger power transformer B ₂Be 220V/6～12V 20VA power transformer.

4, according to the described lithographic printing aluminium plate of claim 1 base material surface coarsening power supply, it is characterized in that controllable silicon KP can adopt the one-way SCR element of the withstand voltage 800V of 500A.

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