Chapter IV 1
K THU T NÂNG - V N CHUY N
CHƯƠNG IV
CÁC THI T B PHANH HÃM
(ARRESTING GEAR AND BRAKES)
Chapter IV 2
1. M C ĐÍCH:
-They stop the load and hold it when applied to the hoisting motion
or bring the relevant mechanisms at rest within specified braking
distances as this is the case on traveling and slewing motion
Chapter IV 3
2. PHÂN LO I:
D a vào c u t o b ph n làm vi c (contruction):
Phanh má.
Phanh đai.
Phanh đĩa.
Phanh nón.
D a vào ngun t c ho t đ ng (operating principle) :
Phanh t đ ng (automatic)
Phanh đi u khi n .( controlled)
H p thành phanh áp tr c ( m t ma sát
ch r i hay kng ch r i).
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Chapter IV 4
2. PHÂN LO I (tt):
D a vào ch c n ăng (the purpose the brake serves):
Phanh d ng c ơ c u cu i chuy n đ ng.( stopping brakes)
Phanh gi i h n v n t c, nh ưng không gi v t .( regulating brakes)
Theo tính ch t c a s c đ ng l c đi u khi n phanh
(the mode of applying the brakes-operating force):
Phanh thưng đóng.( normally -set brakes)
Phanh thưng m .( normally-released brakes)
Phanh t ng h p. (combination brakes)
Chapter IV 5
Purpose
-Arresting gears are the means of sustaining the
load which do not interfere with the hoisting but
prevent it from coming down due to gravity
-Arresting gear in general fall into two basic kinds
which are the ratchet- and- pawl arrangement and
Back- stopping roller clutch
3. CƠ C U KHÓA D NG
(Arresting gear)