Ekskavatorlar uchun gidravlik moyni oqilona tanlash

(1) gidravlik moyning yopishqoqligi
Shlangi moyning viskozitesini aniqlash printsipi gidravlik moyning (nasoslar va motorlar kabi komponentlar uchun ishlatiladigan) yopishqoqligini hisobga olgan holda optimal diapazonda (16-36x10-6m ㎡/s) ushlab turishdan iborat. Shlangi sxemaning ish harorati va samaradorligi; Eng past muhit haroratiga mos keladigan qisqa muddatli sovuq ishga tushirishning yopishqoqligi 1000X10-6m ㎡/s dan kam yoki unga teng; Va qisqa vaqt ichida 90 daraja maksimal ruxsat etilgan oqish haroratiga mos keladigan yopishqoqlik 10X10-6m ㎡/s dan katta yoki unga teng.
2) Yopishqoqlik indeksi (VI)
This indicator directly reflects the property of oil viscosity changing with temperature, i.e. the viscosity temperature characteristics of oil. The viscosity index of oil is higher, indicating that the degree of change in viscosity with temperature is relatively small; On the contrary, it is larger. The viscosity index of anti-wear hydraulic oil from well-known foreign manufacturers such as Mobil and Shell is VI ≥ 110, while the viscosity index of domestic advanced anti-wear hydraulic oil is around 95. The viscosity index of high viscosity index hydraulic oil (HV) and multi-stage engine oil produced abroad is VI>140. Bu, ayniqsa, import qilinadigan yirik gidravlik ekskavatorlardan foydalanadigan va mahalliy ishlab chiqarilgan gidravlik moydan foydalanadigan (yoki dvigatel moyini gidravlik moy sifatida ishlatadigan) foydalanuvchilar uchun ayniqsa muhimdir. Yopishqoqlik indeksining pasayishi moy moslasha oladigan harorat oralig'ini toraytiradi. Agar uni ishlatish kerak bo'lmasa, tegishli ma'lumotni moy ishlab chiqaruvchisi bilan maslahatlashish kerak. Yog 'foydalanish diapazoni mos ravishda sozlanishi va agar kerak bo'lsa, uskunaning tegishli sozlamalari qiymatlari ham o'zgartirilishi kerak (masalan, haddan tashqari harorat va boshqalar).
(3) Boshqa keng qamrovli ishlash
Zamonaviy yirik gidravlik ekskavatorlarning gidravlik tizimining yuqori ish bosimi (32MPa dan katta yoki unga teng) tufayli, gidravlik moyning ruxsat etilgan maksimal ish yog'i harorati ham yuqori (taxminan 90 daraja). Shuning uchun, gidravlik tizim normal yog 'almashinuvi davrida normal ishlashini ta'minlash uchun tanlangan yog'ning moylash, oksidlanish barqarorligi, aşınma qarshilik, zang va korroziyaga chidamliligi, emulsiyaga chidamliligi va ko'pikka chidamliligini ta'minlash kerak. tizim kesish barqarorligi va haddan tashqari bosim yukiga qarshilik jihatidan yaxshi sifatga ega.