High quality and suitable for many applications, INKOMA screw jack systems are perfect for lifting, lowering, and push or pull movements.
The compact size MERKUR worm gear screw jack is made for a load range of 250 kg (550 lb) to 50,000 kg (55 ton). The cubic design and universal mounting facilitates alignment of the drives during installation. The typical application for the small MERKUR series is where moderate loads have to be accurately lifted, precisely positioned and safety held at medium duty cycles, moderate lifting speeds and small confined spaces.
Features:
- 9 sizes with lifting capacities of 2.5 kN to 500 kN
- Drive-motor speed of up to 1500 rpm
- Self-locking trapezoidal machine screw
- Optional ball screw
- Grease-lubricated
- Worm gear and wheel sets in two ratios (normal “N” and slow “L”)
- Interchangeable with other metric manufacturers of worm gear screw jacks with cubic design.
- Large variety of accessories: ball screw, bellow, limit switches, heads, spindles, motor flanges etc.
| Selection table screw jack MERKUR | ||||||||||
| Size | M 0 | M 1 | M 2 | M 3 | M 4 | M 5 | M 6 | M 7 | M 8 | |
| Max. lifting capacity dynamic/static | [kN] | 25 | 5 | 10 | 25 | 50 | 150 | 250 | 350 | 500 |
| Max. tensile load dynamic/static | [kN] | 25 | 5 | 10 | 25 | 50 | 150 | 250 | 350 | 500 |
| Screw Tr | 14×4 | 18×4 | 20×4 | 30×6 | 40×7 | 60×9 | 80×10 | 100×10 | 120×14 | |
| Ratio N | 4:1 | 4:1 | 4:1 | 6:1 | 7:1 | 9:1 | 10:1 | 10:1 | 14:1 | |
| Lift per revolution for ratio N | [mm/per rev.] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Ratio L | 16:1 | 16:1 | 16:1 | 24:1 | 28:1 | 36:1 | 40:1 | 40:1 | 56:1 | |
| Lift per revolution for ratio L | [mm/per rev.] | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Max. drive capacity2) at T = 20 °C Duty cycle (ED) 20 %/h |
[kW] | 12 | 2 | 3 | 5 | 9 | 26 | 37 | on request | |
| Max. drive capacity2) at T = 20 °C Duty cycle (ED) 10 %/h |
[kW] | 25 | 42 | 6 | 11 | 19 | 37 | 44 | on request | |
| Screw efficiency rating | [%] | 49 | 425 | 40 | 40 | 365 | 325 | 29 | 24 | 28 |
| Overall efficiency for ratio N | [%] | 34 | 30 | 28 | 27 | 25 | 19 | 19 | 15 | 15 |
| Overall efficiency for ratio L | [%] | 24 | 23 | 21 | 19 | 18 | 14 | 14 | 11 | 11 |
| Screw torque at max. lifting power | [Nm] | 32 | 75 | 16 | 60 | 153 | 437 | 1390 | 2312 | 4100 |
| Max. permitted drive-shaft torque | [Nm] | 15 | 34 | 71 | 18 | 38 | 93 | 240 | 340 | 570 |
| Mass moment of inertia J Ratio N type 1 |
[kg cm2] | 7 | 122 | 16 | 78 | 1,917 | 3,412 | 1,604 | 4,912 | 9,627 |
| Mass moment of inertia J Ratio N type 2 |
[kg cm2] | 69 | 126 | 165 | 794 | 1,952 | 3,741 | 1,758 | 5,245 | 10,339 |
| Mass moment of inertia J Ratio L type 1 |
[kg cm2] | 45 | 88 | 115 | 558 | 1,371 | 2,628 | 1,235 | 3,705 | 7,262 |
| Mass moment of inertia J Ratio L type 2 |
[kg cm2] | 5 | 91 | 119 | 552 | 1,381 | 2,647 | 1,244 | 3,737 | 7,315 |
| Housing material | LM25-TF | EN-GJL-250 | EN-GJS-400-15 | |||||||
| Weight without stroke length and protection tube |
[kg] | 6 | 12 | 21 | 6 | 17 | 32 | 57 | 85 | 160 |
| Screw weight per 100 mm stroke | [kg] | 1 | 35 | 45 | 7 | 12 | 2 | 42 | 66 | 103 |
| Amount of lubricant in worm gear | [kg] | 3 | 8 | 14 | 24 | 8 | 11 | 2 | 27 | 32 |
