AC Variable Frequency Drive Drawworks
• The main components of drawworks are AC variable frequency motor, gear reducer, hydraulic disc brake, winch frame, drum shaft assembly and automatic driller etc, with high gear transmission efficiency.
• The gear is thin oil lubricated.
• Drawwork is of single drum shaft structure and the drum is grooved. Compared with similar drawworks, it is of many merits, such as simple structure, small volume, and light weight.
• It’s AC variable frequency motor drive and stepless speed regulation in whole course, with high power and wide speed adjustable range.
• The main brake adopts hydraulic disc brake, and the brake disc is water or air cooled.
• The auxiliary brake is of motor dynamic braking.
• Equipped with independent motor automatic drilling system.
Basic Parameters of AC Variable Frequency Drive Single Shaft Drawworks:
|
Model of rig |
JC40DB |
JC50DB |
JC70DB |
|
|
Nominal drilling depth, m(ft) |
with Ф114mm(4 1/2”)DP |
2500-4000(8200-13100) |
3500-5000(11500-16400) |
4500-7000(14800-23000) |
|
with Ф127mm(5”) DP |
2000-3200(6600-10500) |
2800-4500(9200-14800) |
4000-6000(13100-19700) |
|
|
Rated power, kW (hp) |
735 (1000 ) |
1100 (1500 ) |
1470 (2000 ) |
|
|
Qty. of motors ×rated power, kW (hp) |
2×400(544)/1×800(1088) |
2×600(816) |
2×800(1088) |
|
|
Rated speed of motor, r/min |
660 |
660 |
660 |
|
|
Dia. of drilling line, mm(in) |
32 (1 1/4) |
35 (1 3/8) |
38 (1 1/2) |
|
|
Max. fast line pull, kN (kips) |
275(61.79) |
340(76.40) |
485(108.36) |
|
|
Main drum size (D×L), mm (in) |
640×1139(25 1/4×44 7/8 ) |
685×1138(27 ×44 7/8 ) |
770×1439(30 ×53 1/2 ) |
|
|
Brake disc size (D×W), mm(in) |
1500×76 (59 ×3) |
1600×76 (63×3) |
1520×76 (59 3/4) |
|
|
Motor power of automatic driller, kW (hp) |
37(50) |
45(60) |
45(60) |
|
|
Transmission type |
Double-stage gear transmission |
Double-stage gear transmission |
Double-stage gear transmission |
|
|
Auxiliary brake |
Dynamic braking |
Dynamic braking |
Dynamic braking | |
|
Overall dimension(L×W×H),mm(in) |
4230×3000×2630 (167×118×104) |
5500×3100×2650 (217×122×104) |
4570×3240×2700 (180×128×106) |
|
|
重量Weight, kg(lbs) |
18600(41005) |
22500(49605) |
30000(66140) |
|
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