Txij li thaum muaj ntau yam uas cuam tshuam rau kev tsim muaj peev xwm thiab cov nyhuv granulation ntawm rauj mills, tsis muaj cov qauv kev ntsuas theoretical uas suav nrog ntau yam tam sim no. Hauv kev ua haujlwm tiag tiag, kev tsim khoom muaj peev xwm feem ntau tsuas yog ntsuas los ntawm kev sim thiab kev sib piv.
Lub ntsiab yam tseem ceeb cuam tshuam rau lub peev xwm ntau lawm thiab granulation nyhuv ntawm rauj zeb yog raws li nram no:
1. Qhov hnyav, cov duab thiab cov khoom siv rauj
Lub zog kinetic ntawm lub rauj yog proportional rau qhov hnyav ntawm rauj, uas yog, qhov hnyav dua rauj, lub zog kinetic ntau dua ntawm rauj, thiab qhov zoo dua cov nyhuv crushing. Tab sis qhov hnyav dua qhov hnyav ntawm lub rauj, qhov ntau dua lub zog centrifugal generated los ntawm kev sib hloov, uas kuj ua rau kom lub load ntawm lub rotor thiab lwm qhov ntawm lub rauj zeb. Ntawm qhov tsis sib xws, yog tias lub rauj yog lub teeb dhau, lub zog kinetic ntawm lub rauj yuav me me, lub peev xwm crushing yuav tsis muaj zog, thiab txawm tias lub rauj yuav nquag ua haujlwm dhau thaum ua haujlwm, yog li ua kom nrawm ntawm tus pin.
The shape and material of the hammer also have a certain influence on the granulation effect. The "T"-shaped hammer has a sharp impact surface on the top of the hammer, so it not only has a good impact effect, but also has a better tearing effect than square, stepped, and three-convex hammers. In addition, if the hammer is not wear-resistant, the broken effect of the worn hammer will be poor, and the resulting rubber particles will be larger and uneven, which will affect the drying of the rubber particles.
2. Kev sib hloov ceev ntawm lub rotor
Under the condition that the number of hammers is constant, the higher the rotation speed of the rotor, the greater the kinetic energy of the hammer (that is, the kinetic energy is proportional to the square of the speed). The smaller the size, but the increase in the speed, the load of the motor, the vibration and noise of the machine will increase, and the strength of the machine parts and the balance of the rotor will also be required. The rotor speed of the domestic CM·550X 500 hammer mill has been increased from 2000r/min to 2500r/min. The comparative test results also show that the rotor speed cannot be increased excessively. Because the speed is too high, the load of the motor, the vibration and noise of the machine increase, and there is no obvious benefit to the output and the drying of the rubber particles. Therefore, the working speed of the rotor is set at 2000r/min.
3. Tus nqi qhib ntawm lub vijtsam tso tawm
Nyob rau hauv cov xwm txheej uas tag nrho cov cheeb tsam ntawm qhov kev tso tawm ntawm qhov screen yog tas mus li, qhov qhib tus nqi cuam tshuam nrog qhov loj ntawm qhov qhib, tus naj npawb ntawm qhov, qhov kev ncua deb ntawm lub qhov thiab qhov kev npaj ntawm lub qhov. Raws li qhov qhib tus nqi ntawm qhov tso tawm qhov screen nce, qhov tso tawm ntawm qhov screen nce. Nws yuav tsum tau taw qhia tias qhov qhib tus nqi ntawm lub vijtsam tso tawm yuav tsum xyuas kom meej tias qhov tso tawm ntim ntau dua (tsawg kawg yog sib npaug) cov khoom ntim, txwv tsis pub lub tshuab yuav raug thaiv, thiab ib zaug thaiv, cov khoom siv roj hmab uas tsis tuaj yeem tawm. los ntawm lub tshuab yuav yob. Rau hauv ib lub pob roj hmab loj, lub cev muaj zog yuav overloaded thiab hlawv tawm.
Nyob rau hauv cov xwm txheej uas tag nrho cov cheeb tsam thiab aperture ntawm qhov tso tawm ntawm lub vijtsam tseem tsis hloov pauv, raws li qhov sib nrug ntawm lub qhov txo qis, tus naj npawb ntawm qhov qhib yuav nce, thiab qhib tus nqi yuav nce ntxiv, uas yog qhov txiaj ntsig zoo rau kev ua kom lub ntim tawm thiab txo lub zog noj. Txawm li cas los xij, txhawm rau kom ntseeg tau lub zog, nruj thiab kev pabcuam lub neej ntawm lub vijtsam tso tawm, lub qhov sib nrug yuav tsum tsis txhob me dhau, txwv tsis pub, lub vijtsam tso tawm yuav nrawm nrawm los ntawm kev cuam tshuam, sib tsoo thiab corrosion ntawm cov kua qaub seem ntawm cov khoom siv roj hmab. . Nyob rau hauv cov xwm txheej uas qhov qhib ntawm qhov kev tshuaj ntsuam tawm tseem tsis hloov pauv, nrog qhov nce lossis txo ntawm lub qhov taub, cov khoom siv roj hmab uas tsim los kuj yuav nce lossis txo, thiab cov roj hmab hais ntawm ntau qhov sib txawv muaj qhov sib txawv kom qhuav, yog li xaiv qhov pore. qhov loj me kuj yuav tsum tau txiav txim siab vim kev sim qhuav.
4. Pretreatment txoj kev rau cov khoom sib txawv ntawm cov roj hmab thiab agglomerates
Different properties refer to the coagulation concentration of latex, the hardness and water content of the clot, etc. They have a certain influence on the granulation effect. When producing fresh latex standard rubber, the coagulation concentration of latex is generally controlled at 20-25 percent . When the coagulation concentration is constant, the pretreatment method of the clot is different, which has a great impact on the granulation effect. Practice has proved that using a crepe machine (dewatering machine) to treat the clot, although the rubber particles produced are relatively fine, However, the water content of the rubber particles is high, and they are easy to bond into agglomerates after being heated. The drying time is longer, and the phenomenon of sandwiching or sticking may occur. The film rolled by multiple creping machines is relatively thin (the thickness is generally 5 —6mm), the surface is rough, and the film has many small pores. This is not only good for granulation, but also the produced rubber particles are uniform, have low water content, are not easy to stick and form agglomerates, and the drying time can be shortened. Therefore, most factories currently use two to three crepe machines for pretreatment of rubber materials.