Metall eritish pechining tigel qochqin signalizatsiya qurilmasidan xavfsiz foydalanish usuli

The crucible leakage alarm device of the metall eritish pechlari is necessary to ensure safe production, prevent the occurrence and expansion of furnace leakage accidents, help judge the use of the furnace lining, and prolong the furnace age. It is necessary to set up a crucible leakage alarm system. Generally, a direct current alarm device is used to install the stainless steel wire bottom electrode (first electrode) in contact with the molten iron and the stainless steel plate (mesh) side electrode (second electrode) between the induction coil of the furnace lining. Connect the electrode leads to the alarm device. When the molten metal leaks to the side electrode, the current rises to the set value, and the alarm device is activated. During the installation of the alarm device, it is necessary to check whether the connection between the lead wire and the electrode is good; whether the lead wire is grounded (resistance to ground> 5kC). During operation, sometimes the stainless steel wire melts at the bottom of the furnace. You can insert a conductive rod into the molten iron and use a multimeter to measure it. If the stainless steel wire is disconnected in the furnace lining, the alarm system will fail and it can only be laid when the furnace is rebuilt next time. After the alarm occurs, check whether it is a false alarm (false alarms mainly include: induced potential interference, lead wire grounding, and furnace lining wet). If the false alarm is eliminated, the furnace lining can be determined to be damaged.

Metall eritish pechining yangi qoplamasi astarli pechni eritishning dastlabki bosqichida. Suvning adsorbsiyasi va astar yuzasida borik kislotasi kristalli suvining cho’kishi tufayli astarning qarshiligi pasayadi va signal ampermetrining ko’rsatkichi ko’tariladi. U yuqori bo’lsa, signal qiymatiga erishish mumkin, lekin bu vaqtda oqim odatda asta-sekin ko’tariladi. Bir nechta pechlar eritilgandan so’ng, u asta-sekin kamayadi va umumiy qochqin signal oqimidan farqlanishi mumkin bo’lgan normal diapazonga qaytadi. Ba’zan quritish davrida pasayish tendentsiyasida bo’lgan signal oqimi yana ko’tarila boshladi. Bu vaqtda o’choq tekshirildi va ehtiyotsizlik tufayli qo’shilgan temir material iskala quyi eritilgan temir erish harorati keskin ko’tarilishiga va sinterlash haroratidan oshib ketishiga olib keldi. (1600 ° C dan yuqori) o’choqning butun qoplamasi deyarli faqat qattiq vitrifikatsiyalangan va qattiq sinterlangan qatlam bilan sinterlanadi, o’tish qatlami va bo’sh qatlamsiz, shuning uchun o’choqning oqish avariyasiga sabab bo’ladi. Bu vaqtda o’choq paytida o’choqning qochqin signali to’g’ri. 3t oraliq chastotali eritish pechi boshqa signalizatsiya moslamasidan foydalanadi, birma-bir tuproqli qochqinlarni aniqlash moslamasi. Qurilma quvvat manbaiga ulangan topraklama aniqlash modulini va o’choqda joylashgan topraklama oqish probini o’z ichiga oladi. Agar qotishma suyuqlik lasan bilan aloqa qilsa, topraklama qochqin probi lasan oqimini erga olib boradi va topraklama probi moduli uni aniqlaydi va uni kesib tashlaydi. Bobinning yoyi parchalanishini to’xtatish va qotishma suyuqlikning yuqori kuchlanishni o’tkazishiga yo’l qo’ymaslik uchun quvvat manbai. Tuproq qochqinni tekshirish moslamasi tez-tez va muntazam ravishda o’choqning tuproq qochqinni tekshirish tizimining buzilmaganligini va ishonchliligini tekshirish uchun ishlatilishi mumkin, bu esa er qochqin zondining to’liq erga ulanganligini ta’minlash uchun, operatorning xavfsizligi va pechka kafolatlangan.