Li-additives tsa Konkreite tse bobebe | Li-Agents tse Foaming tse Phahameng ka ho Fetisisa bakeng sa Konkreite ea Cellular
What is foam generator?
Mochini oa ho foamisa, e tsejoang hape ka hore ke jenereithara ea foam, ke mofuta oa lisebelisoa tsa foam tse etsang hore motho ea foaming a fihle boemong bo itseng ba tharollo ea metsi. Mokelikeli o phophomang ka boeona o ke ke oa fetoha foam ka bohona, it must pass the mechanical action of the foaming machine to become foam.
What is the principle of the foam generator?
Ho sa tsotellehe hore na jenereithara ea foam, molao-motheo oa motheo oa ho foaming ke ho kenya moea ka har'a tharollo ea ntho e phoroselang. Mefuta e fapaneng ea liphetoho e fapane ka mokhoa oa ho hlahisa khase, kahoo phello e boetse e fapane.
Ho na le lintlha tse peli tse hlokahalang bakeng sa ho thehoa ha foam, one is foaming agent solution, mme e nngwe ke moya, both of which are indispensable. Ntle le tharollo ea moemeli ea fokang, filimi ea mokelikeli e potolohileng khase e ne e ke ke ea theha 'me ho ne ho ke ke ha e-ba le li-bubble. Le ntle le khase, tharollo e le 'ngoe e ke keng ea etsa lipululana.
Tsamaisong ea sebopeho sa bubble, tharollo ea moemeli ea fokang ke mokhoa oa ho qhalakanya, khase ke mokhahlelo o qhalakaneng, 'me khase e hasanngoa ka har'a mokelikeli ho etsa lipululana, ebe lipululoana tse ngata li etsa foam. Ho phaella ho ntlha ea bohlokoa ea ts'ebetso ea moemeli ea fokang, ho kenngoa ha khase ka tharollo ea moemeli ea fokang ke ntlha e 'ngoe ea bohlokoa. Molao-motheo oa jenereithara ea foam ke ho kenya khase ka har'a mokelikeli, ke hore, jenereithara ea foam e sebelisa mokhoa o itseng oa ho kenya khase mokelikeli. Mechini e fapaneng ea ho phuphutsa e na le mekhoa e fapaneng ea ho hlahisa khase. Ka kakaretso, ho na le mekhoa e mengata ea ho kenya khase mochining o phophomang:
(1) Li-blade tse bilikang butle li hlahisa khase
Ona ke mokhoa oa ho kenya khase ka kotloloho seretseng (kapa seretse sa konkreite) e tsoakiloeng le sekoaelo sa samente. Ha lehare la mixer le sututsa slurry, moea o kena seretseng ka mahare a motsoako. Holim'a moo, moea o mongata o phuthetsoe ka har'a seretse ha seretse se phethola, mme karolo ya moya e tliswa seretseng ke samente le kakaretso. Kakaretso ea tse tharo ke kakaretso ea moea o kenang seretseng. Har'a bona, moea o tlisitsoeng seretseng ke lehare le sisinyehang, 'me moea o phuthetsoe ke lehare le phetholang seretse, o lula' meleng oa mantlha..
Ka mor'a hore moea o kene seretseng, mokelikeli o nang le mokelikeli o phoroselang o pota-potileng moea, ho etsa filimi ea metsi ea elektrone e habeli sehokelong se lipakeng tsa moea le mokelikeli, 'me qetellong e etsa li-bubble ka har'a slurry ka mokhoa oa moea-ka-mokelikeli.
Ka lebaka la lebelo le liehang la ho potoloha ha li-blades le khase e fokolang e hlahisitsoeng ka tsela ena, palo ya dipudula tse hlahisoang e nyane, phello e phophomang ha e ntle, mme katleho e tlase.
(2) Li-blades tse potolohang ka lebelo le phahameng li hlahisa khase
Ona ke mokhoa oa ho kenya khase ka har'a tharollo ea moemeli e fefolang ka ho itšetleha ka li-blades tse potolohang ka lebelo le phahameng.. Ho kenyelletsoa ha khase haholo-holo ho itšetlehile ka matla a mahare a potolohang. Li-blades tsa mofuta ona hangata li hloka ho potoloha ka lebelo le phahameng, the speed should be> 700 rpm, ka kakaretso pakeng tsa 700 le 1400 rpm, and the peripheral speed of the impeller end should be> 20 m/s molemong oa ho fumana liphetho tse khotsofatsang. Lebelo le itseng le phahameng le ka pepesetsa impeller mokelikeli, ho kopana le moya, le ho hlahisa moea. Haeba lebelo le le tlase haholo, impeller e ke ke ea pepesoa ke mokelikeli, mme moya o tswang madi o tla ba tlase haholo. Lebelo le nepahetseng le lokela ho ba ka tlase ho feta moo impeller e pepesehang ha mokelikeli o ntse o potoloha.
The basic principle of impeller bleed air is as follows:
When the impeller rotates at a high speed, it drives the cement foaming agent solution in the foaming cylinder to rotate, forming a rolling circulation and generating a large vortex. Ka nako ena, the gas-liquid two-phase particles located at the gas-liquid interface at the top of the blowing agent solution will accompany them down and descend to the bottom of the vortex in a rapid spiral shape, forming a turbulent flow zone at 2.5-5 cm of the impeller edge. In this area, the gas-liquid two-phase particles are subjected to the strong shear and impact of the impeller, and are dispersed into fine dispersions, which quickly realizes the gas-liquid mixing, makes the gas uniformly dispersed in the liquid, and realizes the gas Introduce. Its introduction efficiency is related to various technical factors such as the speed, the diameter of the impeller, the distance between the impeller and the foaming tube, and the shape of the impeller blades. It is not determined by a single speed. High-speed impellers have air-entraining effects, but the efficiency, phello, and energy consumption are different.
(3) Use of pressure to introduce gas.
This is currently the most commonly used advanced air-entrained foaming method at home and abroad. Hape ke mokhoa oa saense oa ho kenya moea. It is the core of foam concrete high-pressure and medium-pressure foam generator technology.
Mekhoa e 'meli e boletsoeng ka holimo e lieha ebile ha e lekane, mme bophara ba bubble bo boholo, haholo-holo bophara ba bubble e ke ke ea laoloa. E itšetlehile ka ho feletseng ka mokhoa o sa reroang oa mochine o phoroselang, 'me e ke ke ea tiisa bophara ba bubble e nyane le foam e ts'oanang. Matšoao a bohlokoa ka ho fetesisa a tekheniki. Ka nako e tšoanang, bongata ba ho phophoma makweba ho thata ho laola.
E le ho rarolla mathata a ka holimo ka katleho, mokhoa o kentsoeng ke khatello ea ho phophoma magwebu o ile oa hlaha. Regardless of foaming volume, lebelo le phophomang, or foam diameter and foam uniformity, etc., ba hatetse boemo bo bocha 'me ba entse tsoelo-pele e kholo ea theknoloji. Molao-motheo oa eona o ka sehloohong ke ho sebelisa lisebelisoa tse fapaneng tse ka hlahisang khatello ea moea ho hatella moea sebakeng sa mokelikeli ho fihlela motsoako o tšoanang oa mekhahlelo e 'meli.. Tlas'a khatello e tloaelehileng, ho thata hore moya o kene leroleng, empa tlasa kgatello e itseng, ho ba bonolo. Khatello ena ea moea ha e hatelle feela khase mokelikeli, empa hape o hatella mokelikeli ka har'a khase. Haele hantle, e sebetsa ka nako e le 'ngoe khatello. Ka tsela ena, ho kopanngoa ha mekhahlelo e 'meli ho tla potlaka, e sebetsang hantle, junifomo, 'me u be le li-bubble tse ntle, e kopanang le litlhoko tse loketseng tsa tekheniki bakeng sa foam.
There are two main types of pressure equipment used in our country, one is an air compressor and the other is a blower. The air compressor produces high pressure, and the blower produces medium low pressure. Ka hona, the foaming effect of the air compressor is better, and the foaming effect of the blower is slightly worse. Foaming with an air compressor is called a high-pressure foaming machine, and foaming with a blower is called a medium and low pressure foam generator. The foaming quality of the air compressor mainly controls its pressure and displacement, while the foaming of the blower mainly controls its wind pressure and air volume.
Due to the good foaming effect of air compression mechanism, most foaming machines in our country use air compressors. Blower foaming also has many applications in my country, but compared to high-pressure foaming, this foaming method is still rare. The foam produced by high-pressure air foaming has a low water-sucking rate, the bubble diameter is small, dense and uniform, and the quality is high. The foam produced by blast foaming has a slightly larger diameter, and the overall quality is not as good as high-pressure foaming.
(4) High pressure jet introduces gas
This is a foaming method that has been tried in recent years but has not been widely used. The basic principle is to use the strong dispersion force generated by the jet to achieve instantaneous large surface contact between the gas phase and the liquid phase, so that the two are uniformly mixed, and the liquid is entrapped to form a foam. This method does not show any more advantages than high-pressure air foaming, and it needs further exploration and improvement.
Cie-China.org ke mofani ea ka sehloohong oa li-additives tsa konkreite ea foam e fanang ka konkreite e foqohang, superplasticizer,foam konkreite e matlafatsang bakeng sa konkreite e bobebe, Li-block tsa CLC. Haeba u batla jenereithara ea foam, ka kopo ikutloe u lokolohile ho iteanye le rona.