基于单片机控制的自动抽放水系统设计说明书带开题
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Discussed digital printer and the numeral printing ink type Along with printing digitization step quickening, the numeral prints cTP and so on the new technology to be like a raging fire. Already becomes prints the irreversible mainstream development technology now. The digital printing printability also has the obvious difference with traditional printing. To the printing equipment printing material, the printing technology set the new request. In order to achieve the good print quality and the high velocity production. The digital printing material, in particular the numeral printing ink research and the development appears importantly. After several years development, the numeral printing ink technology Zhen will be later day mature. But the numeral printing ink high price still was restricts the digital printing development the bottleneck. The principle digital printing image formation To discuss the numeral printing ink, must talk about the digital printer inevitably, because the different factory promotes the digital printer image formation principle is different, to uses the numeral printing ink the composition performance, the character request to be also different. At present uses the digital ElSiJ equipment image formation principle may divide into six big kinds.1.electronic camera called the static electricity image formation, is useing the laser scan method to form the static electricity on the photoconductor to dive the shade to use the charged color powder and the static electricity again dives the shade electric charge function, shifts the color powder phantom to accepts for printing in the thing to complete printing.2.spray imaging printing ink have by certain speed from the tiny spray nozzle selectively spray to accept for printing in the thing to realize the printing ink phantom reappearance. Spurts ink printing to divide into continuously spurts ink printing and according to must spurt ink printing. Spurts the ink system is continuously causes the ink using the pressure to form the continual ink class through the pore. After the high speed under ink changes the tiny bubble causes the bubble charged. The charged ink drop may spray under the electric charge board control to accepts for printing the position which the surface needs to form the printing chart article. The ink drop displacement quantity and accepts for printing an inking position leaves when the pore by the ink drop the charged quantity decisionAccording to must spurt the ink with to spurt the ink differently to lie in affects Yu the Chu ink the pressure is not continuously continual. When is the image formation digital signal control, the need only then has the pressure to affect sprays. According to must spurt the ink because does not have the ink drop displacement, may omit the ink trough and the circulatory system, spurts the ink structure relative simplification ? 203. electricity condensation image formation Electricity condensation image formation is through the electrode between electrochemistry responded causes the printing ink to have the condensation. And adheres firmly in the image formation drum surface forms the image. Has not had the blank region printing ink which the electrochemistry responded still to maintain the liquid state to be possible through the scraper to blow except, but the drum surface from adheres firmly the chart article which the printing ink forms then to shift through the pressure to accepts for printing in the thing, completes printing. Electricity condensation numeral printer representative the type is the EIcorsy Corporations product. The resolving power is 400dpi? 204. magnetic recording image formation Magnetic recording image formation is depends upon the magnetic material the magneton the directional arrangement to form magnetism under the outside magnetic field function to dive the shade. Again dives the shade using magnetism sex-linked colors powder and magnetism to affect mutually under the magnetic field strength completes the development. Shifts by magnetism sex-linked colors powder to accepts for printing in the thing to form the image. This method only uses in black and white printing generally5. Static electricity image formations Static electricity image formations apply the broadest digital printing image formation technology. It is uses the laser scanning method to form the static electricity on the photoconductor to dive the shade. Uses the charged color powder and the static electricity dives the shade electric charge function to form dives the shade, shifts to accepts for printing in the thing namely to complete printing. Develops the way differently to divide into two kinds of one kind uses the electronic printing ink development. Resolving power ? 00dpi, take HPInd go as representative. Another kind is uses the dry color powder development, the resolving power ? 00dpiXeikon, Xerox, Agfa, CanonKodak, ManRoIand and IBM and so on the digital printer all uses this method ? 206. Thermal imagery Thermal imageries are after the material heating the physical performance change on the medium the image formation. Divides into the direct thermal imagery and the hot shift image formation. The direct thermal imagery is the use after processes specially has the special coating to accept for printing the material, after the heating the coating has the color transformation. The hot shift image formation printing ink spreads the cloth on the inked ribbon. Namely shifts to the color membrane or the inked ribbon heating to accepts for printing on the material, the image formation quality may reach the picture levelNumeral printing ink 1. Dried powder digital printing ink Dried powder digital printing ink helps by the pigment granule which forms in the electric charge the pellet electrically charged medicinal preparation and the fusibility resin mix forms. Has the negative charge toner to expose the part adsorption to form the image to transfer in the toner the resin to melt Indias to paper on toner image after the heating, adheres firmly in accepts for printing in the thing to form the image ? 202.Liquid state numeral printing ink Liquid state numeral printing ink commonly used Yu Penmo prints, the printing ink type with spurts an ink structure to concern. Spurts the ink separable thermo-compression type and the piezoelectricity type two big kinds, but the piezoelectricity type has the high accuracy and the low accuracy 2 kind of .EPSON nozzle belongs to high accuracy nozzle Xaar and the Spectra nozzle belongs to the low accuracy nozzle. The high accuracy nozzle uses the river character dye or the pigment printing ink. The latter uses the solvent pigment printing ink majority. And the difference is that the traditional ink, electronic ink in the liquid medium is not dependent on the curing film ink drying time. But encountered high temperature (130. C) immediately curing blanket on the blanket. Fax ink on the blanket and then transfer to 100% of paper or other media.On the other hand. Basic electronic liquid ink is a new resin material, and its micro-polygon shape. Under pressure, unlike the spread of traditional ink, but with the combination of close contact with paper or other media immediately after curing so that the printed image a little more clearly the edge of virtual networks and the proliferation of.Electronic liquid ink into water-based ink and oil-based (solvent-based) ink. Water-based ink by the solvents, coloring agents, surfactants pH modifier, drying agent and add the necessary components. For hot-type ink-jet printing system, the only choice of water-based ink. On-demand ink-jet printing ink is usually water-based ink. Oil (solvent-based) ink solvent by the coloring agent, distributed 3, J n the composition of other regulators.3.solid-state digital printing inkSolid-state digital printing ink jet printing is mainly used in the normal solid-state under the printing ink was heated, the viscosity decreases and the jet after the substrates surface. Solid-state digital printing ink from a coloring agent, charge-Dutch tablets agent, viscosity control agents and carriers and other components.4. Electronic inkElectronic ink is a special coating for the printing film-based materials as a display of a special ink made from microcapsules coated in nano-scale diameter. Microcapsules, there are many positively charged white particles and negatively charged black particles, and micro-capsules in a transparent liquid. When positively charged microcapsules charge, the positively charged particles gather in the direction of the observer side, and appear as white; negative electrical charge, the negatively charged black particles gathered at the observer side, and show the black.Particles showed that the color of the location and control by the electric field to control the electric field from high-resolution display arrays generate floor.5.UV/EB inkThe so-called UV / EB ink is to use UV-curable or electron beam energy curing ink. uv / EB radiation curing type ink-jet printing ink in an increasingly wide range of applications. UV inks in digital printing is the most important feature of good stability, and only in the uV light the advantages of curing can be effectively blocked to prevent the print head to extend the actual print head life. However, inadequacies yes. Using uv / EB printing inks print speed will result in lower, such as ink supply constraints and a large quantity of ink through the print head speed. At present, Xennla new XenJetVivide series uV-curable CMYK pigment-based inks Xaar has adopted the companys certification, and this new printing ink used in Omnidot760 head.Now, the worldwide study of the number of printing ink is in full swing, the digital printing press manufacturers such as Canon, HewIett Packard, EPSONScitexXeikon, HPIndigo and so on according to their characteristics of digital presses and research and development to adapt to the characteristics of their systems the number of printing ink. In addition, other well-known global manufacturer of printing ink. Such as DIC, Sun Chemical, Flint, SakataInxCorp companies have begun to set foot in the digital printing ink development and production. With the widespread use of digital presses, digital printing ink on the research and development will be more in depth. 5a new digital printing ink will continue to emerge.IIThe external condition research of affecting pumps using machinery sealAbstract: Through to pumps with the mechanical seal practical application and the theoretical analysis, proposed the mechanical seal actual seal effect not only with the mechanical seal own performance related, the condition which with other spare parts also which provides the condition as well as the seal servosystem provides to have the important relations, therefore pumps the unit product when the design, must for the mechanical seal use provide a good external condition.Key words: Pumps Mechanical seal MeasuresAt present the mechanical seal in pumps in a kind of product the application extremely widespread, but and will save the energy along with the product technical level enhancement the request, the mechanical seal application prospect is more widespread. The mechanical seal seal effect directly will affect the entire machine movement, in particular in petroleum chemical industry domain, because will exist flammable, explosive, is easy to volatilize, to be violently poisonous and so on the medium. The mechanical seal appears will divulge, seriously will affect the production normally to carry on, is serious also appears the significant security accident. People when analysis quality breakdown reason, often is familiar with in the mechanical seal own aspect searches the reason, for example: Mechanical seal shaping whether appropriate, choice of material whether correct, the packing surface compared to presses whether correctly, rubs the vice- choice is whether reasonable and so on. But is short very much in the mechanical seal external condition aspect searches the reason, for example: Pumps for the mechanical seal creation condition whether appropriate, the servosystem disposition is whether appropriate, but these aspects reasons often are count for much. This article author from pumped has analyzed the reasonable measure with the mechanical seal external condition angle which the influence seal effect several kind of factors and should adopt.1 Principle and request that machinery seals off: The mechanical seal is depends on a pair of relative motion link end surface A (fixed, another revolves together with axis) the mutual fitting forms the small axial play plays the seal role, this kind of equipment is called the mechanical seal. The mechanical seal usually by moves the link, the static link, contracts the part and the seal part is composed. Moves the link and the static link end surface composes a pair to rub, moves the link to depend on in the sealed chamber the liquid pressure to cause its shoulder up on the static link end surface, and produces on two links end surfaces suitable compared to presses and maintains an extremely thin liquid membrane to achieve the seal the goal. Contracts the part pressurize, may cause to pump under the operating condition, also maintains the end surface fitting, guaranteed the seal medium nothing more than leaks, and prevented the impurity enters seals the end surface. Seals the part to play the seal to move the link and axis gap B, the static link and the gland gap C role, simultaneously to the vibration which pumps, attacks the cushioning effect. The mechanical seal in the actual movement is not an isolated part, it is with other spare parts which pumps combines the movement together, simultaneously may see through its basic principle, the mechanical seal normal operation has the condition, for instance: Otherwise fleeing measures a pump spindles being not able to very big, friction subsidiary end face can not form the ratio pressure demanding regularly; The pump spindle that machinery hermetic sealing gets along can not have boundary very big deflection , end face waits a minute otherwise than pressure will be uneven. Besides only when satisfying similar such external condition, fine machinery seals off oneself function, ability reaches ideal hermetic sealing effect.2 Analysis of causes that external condition affects:2.1 Pump spindle axial to fleeing is measured big:The hermetic sealing that machinery seals off needs to have certain ratio pressure face to face, such ability plays arrive at hermetic sealing role, be requiring that spring that machinery seals off needs to have certain compression amounts right now, give a propulsive force sealing off end face, rotating makes hermetic sealing produce the pressure sealing off the what be demanded ratio face to face. For ensuring that this one is compared to pressure, the amounts machinery is sealed off requiring that the pump spindle can not have very big fleeing, need to ensure that within 0.5 mm in general. Design but middle in reality, unreasonable because of design, that sometimes, very big fleeing of pump spindle creation measure , seal off to machinery sigmatism is very disadvantageous. This phenomenon sometimes appears in multi-level centrifugal pump, Especially in the process of pump starting, flee amounts are comparatively big.The automation changes the b balancing a set and balancing the axial gap between the ring when balance plate works , changes the difference balancing the pressure checking front and back two flanks thereby , produces one and comes to balance the axial force axial contrary force direction acting force. The inertia effect moving since the rotator flees and transient pump working condition fluctuation, the rotator moving round will not be motionless in some one axial balance location.Balance the state fleeing all the time in retinue to move. But the amounts balancing axial to fleeing in checking in regular job only have 0105 011 mm , satisfy permission axial to fleeing that machinery seals off measuring 015 mm requests, allowable machinery hermetic sealing axial to fleeing balancing axial to fleeing to measure possibility getting it in gear, when stopping machine , working condition great change in pump making rings round expects that.After pumps passes through the long time movement, the friction balancing a set and balancing a ring wears away , gap b enhances subsequently, the amounts sealing off axial to fleeing increase machinery unceasingly. Effect because of axial force, hermetic sealing compacting soft and floury sucking oblique tones in increases by strenuously , hermetic sealing wears the effect aggravating , sealing up completely until hermetic sealing damages , loses face to face away face to face.The machinery spitting out oblique tones is sealed off , is wear away with balancing plates, rotator component axial to fleeing measures the amounts sealing off axial to fleeing demanding greater than , the force sealing off compacting soft and floury is diminished , cannot reach the effect sealing off a request , making the machinery hermetic sealing on both side of the pump all ultimately losing hermetic sealing.2.2 The axial force is prejudiced big:Machinery hermetic sealing can bear the axial forces in the process of usage, if the effect that existence seals off axial the force , to machinery is grave. Since pump axial the aspect cause such as rational and making , assembling , being put into use that dynamic balance organization designs, brings about the axial force be not balanced away sometimes.Machinery hermetic sealing bears a axial force , the seal gland temperature will be partial to height when moving round, to the medium that polypropylene is similar to, before the high temperature be able to be molten down, the pump starts the queen therefore losing hermetic sealing effect very quickly right away , discontinuous gushing sealing off end face then appearing leaves out phenomenon when the pump is motionless.2.3 pump spindles deflections are slanting big:That machinery hermetic sealing calls end face hermetic sealing, is that one kind of axis of rotation to contact-type moves hermetic sealing , it is under fluid medium and elasticity component effect , two perpendicularities reach hermetic sealing effect thereby in stick the small side door , relative rapid and intense axle centre line hermetic sealing end face revolution, demands to need to accept a force homogeneously between two hermetic sealing therefore.The machinery spitting out oblique tones is sealed off , is wear away with balancing plates, rotator component axial to fleeing measures the amounts sealing off axial to fleeing demanding greater than , the force sealing off compacting soft and floury is diminished , cannot reach the effect sealing off a request , making the machinery hermetic sealing on both side of the pump all ultimately losing hermetic sealing.2.4 not assisting irrigation system or assists irrigation system to interpose block of wood reasonableness: That assisting that machinery seals off washes system is very important , it can protect effects such as sealing off face , getting to the cooling , lubrication , washing away varia effectively. Design that allocation assists irrigation system, to be unable to reach hermetic sealing effect not rationally sometimes;Have foreign substance sometimes although designing that the personnel has designed auxiliary system, since in washing liquid, rate of flow , pressure washing liquid are insufficient , wash mouth location designing that wait for cause unreasonable , also same being unable to reach hermetic sealing effect.2.5 vibration is slanting big:Machinery seals off vibration insisting to lead to big , ultimate losing hermetic sealing effect. That mac
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