Valve gate hot runner mgħammar b'koljaturi tas-solenojdi densi ta '-frekwenza għolja jiġġenera kamp elettromanjetiku li jalterna intensiv matul il-produzzjoni kontinwa; tarka waħda ordinarja -termokoppja mhux protetta faċilment isofru interferenza ta 'akkoppjar elettromanjetiku li jwassal għal qbiż ta' temperatura irregolari, filwaqt li thermocouple strutturat ta 'lqugħ indipendenti doppju isir aċċessorju ta' tqabbil preferut għal YUDO u serje domestika tal-gate tal-valv biex tistabbilizza l-preċiżjoni tat-trasmissjoni tas-sinjal. Thermocouple jittrasmetti sinjal Seebeck ta' livell dgħajjef millivolt-sensittiv ħafna għal fluss manjetiku alternanti estern; kamp elettromanjetiku mifrux minn solenojd ta '-kurrent għoli jaqta' wajer mhux protett kontinwament biex jinduċi vultaġġ żejjed parassitiku superimpost fuq data ta 'kejl effettiva oriġinali, li tikkawża għexieren ta' gradi fluttwazzjoni anormali transitorja tal-qari fuq l-iskrin tal-kontrollur.
Double-shield design sets independent inner shielding layer wrapping paired positive-negative core wire and outer overall metal shielding sleeve separately, inner layer eliminates cross-talk interference between internal positive and negative conductors, outer layer guides external stray electromagnetic noise to equipment grounding loop smoothly, suppressing interference-induced temperature fluctuation within negligible allowable error range. Standard wiring specification requires double-shield thermocouple outer shielding end single-point grounding inside control cabinet, forbidding two-end grounding which forms ground loop and introduces new interference noise. Many purchasers select cheaper single-shield thermocouple for valve gate hot runner to save initial procurement cost, resulting in unstable closed-loop temperature regulation and fluctuating melt quality triggering intermittent defective product. Adding double-shield requirement into valve gate hot runner thermocouple purchasing technical clause improves long-term production stability comprehensively.
