Calculate it right away with the Selection Calculator →
Step 1 · Determine the basic specificationsTo design and manufacture a hydraulic elevator, the basic specifications must be determined first. Based on these, the cylinder diameter and the power unit's pump and motor are selected.
| Basic specification | Symbol | Unit | Description | Example data |
|---|---|---|---|---|
| Rated load | W | kg | 3,000 kg | |
| Car weight | CW | kg | 3,000 kg | |
| Rated speed | V | m/min | 20 m/min | |
| Travel | Tr | mm | 8,200 mm | |
| Roping | RP | 1:1 | Direct – RP = 1 | Indirect RP = 2 |
| 1:2 | Indirect – RP = 2 | |||
| Stroke | L | Indirect | (Travel/RP) + extra length | (8,200/2) + 250 = 4,350 mm |
| Power supply | Voltage (V), frequency (Hz) | 380 V, 60Hz | ||
| Application | Passenger, freight, car, etc. | Freight |
> Cylinder rod set to 195 mm.
Step 2 · CalculateBased on the basic data above, the pressure, flow rate (pump capacity), power (motor selection), actual speed and tank size are calculated as follows.
| Item | Symbol | Type | Formula | Value | Unit | Selection result |
|---|---|---|---|---|---|---|
| Cross-sectional area | A | Formula | (Rod outer diameter ÷ 2)² x 3.14 = | 298.5 | cm² | Diameter 195 mm |
| Calculation | (19.5 cm ÷ 2)² x 3.14 = | |||||
| Operating pressure | P1 | Formula | {(Rated load + Car weight) x RP} + Other weightArea | 42.2 | kg/cm² | |
| Calculation | {(3,000 + 3,000) x 2} + 590298.5 | |||||
| Total pressure | P0 | Formula | Operating pressure(P1) + Friction = | 47.2 | kg/cm² | |
| Calculation | 42.2 + 5 = | |||||
| Flow rate | Q | Formula | (Area x Speed) ÷ (RP x 10) = | 300 | ℓ/min | Use SM 250L pump |
| Calculation | (298.5 x 20) ÷ (2 x 10) = | |||||
| Power | Mp | Formula | (Flow rate x Total pressure) ÷ (612 x 0.8) = | 28.9 | kw | Use 29 kw motor |
| Calculation | (300 x 47.2) ÷ (612 x 0.8) = | |||||
| Actual speed | V | Formula | (Actual pump flow x 2 x 10) ÷ Area = | 20.1 | m/min | |
| Calculation | (300 x 2 x 10) ÷ 298.5 = |