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Drum / Sheaves

 Drum / Sheaves

 


▪ DRUMS

1) Plain drum

Because plain drum without groove is consisted of a plain at the surface of drum, abrasion is on speed
due to high rolling pressure on contact part with rope at the first layer.Besides when drums are used
at the first layer, Winding and cutting arrangement is apt to deform. Thereby in the case of use at the
first layer, it is proper to use drums multilayeredly. By acting as th plat of the rope of first layer, drums
should act as a guide for more than two layers' Winding and cutting.




2) Groove drum

Owing to a wide contact part with rope, groove drum reduces pressure on contact part and decrease abrasion of rope and drum. Esepcially, the effect of rope damage is very few in a single-layer groove drum. Thereby, by being manufactured by a proper size, groove drum can protect the damage caused by of rope and interference among ropes, and make life of equipment itself lengthened.

Classification
(Rope Diameter)

Groove radius
(r)
P(Groove Pitch)

Groove ±íÀÌ
(h)
Single-layer drum
Multi-layer
 drum
10m under
1.13d
-----------
2
1.13d
1.10d
0.3~0.4d
10m over
1.10d
-----------
2
1.10d
1.07d


▪ SHEAVES

1) SHEAVES material

Material
Material Brinell
 hardness
(HB)
Shore hardness
(HS)
After hard surfacing thermal treatment Shore hardness(HS)
Material name
Standard
Spheroidizing graphite cast iron
FCD 40
FCD 45
FCD 50
FCD 60
FCD70
FCD 80
201ÀÌÇÏ
143-217
170-241
192-369
229-302
248-352
-
-
26-37
30-41
36-46
38-52
-
-
-
60-65
-
-
Gray cast iron
FC 25
FC 30
180-220
200-250
27-31
30-37
50-60
-
For machinery
 structure
S 35C
S 40C
S 45C
212-216
167-235
201-269
33-34
25-36
32-41
45-55
50-60
60-70
Carbon stel
 cast steel
SC 45
SC 48
143-200
-
22-32
-
45-50
50-55
Carbon steel
 forged steel
SF 490A
SF 540A
180-230
28-36
-
50-60
Carbon steel
 for railroad wheel
SSW-RI
187-260
30-40
-
High mangan steel
cast steel
SCMnH
215-280
34-42
60-70
Stainless
cast steel
SCS 24
269-375
41-54
-




2) Sheave hardness

Sheave has a considerable effect on life of rope as it is very closely used, with contacted with rope.
Because this makes an influence on sheave's quality, hardness, groove size and diameter, shape of groove, all ropes, etc as well as sheave' life according to complicated factors, setting up a proper size is the important factor at the time of a design. Thereby, because high and low hardness of sheave compared with rope's paly a role for increasing the possibility of abrasion of rope, setting up the hardness of sheave is the important factor.

 Korean agency of FT which is the best sheave and hook block making blend in Japan.

1. Sheave for welding(Hot roll forging)
2. Hook block(Max 600ton with 12 sheaves)
3. FORGED WHEEL FOR crane wheels
4. Sacred products for moving and cargo work.
▪ REVOLVING Hooks
▪ TONGS
▪ LIFTERS
▪ LIFT BEAMS
▪ TURNOVER MACHINE