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Cov pwm no tshwj xeeb yog siv rau kev tsim cov nplhaib sib txhuam.

Txhawm rau tsim txhua yam khoom lag luam annular, vim tias cov khoom yog hollow, cov qauv pwm txawv ntawm cov khoom lag luam zoo tib yam.

Cov yam ntxwv ntawm cov pwm no yog:

(1) Qhov nruab nrab tuag muaj cov leeg thiab cov chais

(2) Muaj cov lus qhia thiab cov tes tsho qhia, thiab cov pwm clamping yog du

(3) Cov pwm tuaj yeem rub tawm thaum ntxiv cov khoom siv raw thiab tshem tawm cov khoom, uas yooj yim rau kev ua haujlwm.

Lub ntsiab parameter ntawm pwm yog raws li nram no: