| Central rotary gripping machine Technical Parameters | ||
| Model | HZ-4A | HZ-6A |
| Lifting capacity (excluding grab bucket)（kg） | 1100 | 1100 |
| Increase speed（m/s) | 0.2-0.4 | 0.2-0.4 |
| Increase wind motor power（kw） | ≈22 | ≈22 |
| Rotation angle | ＞360° | ＞360° |
| Grab bucket capacity（m³） | 0.4 | 0.6 |
| Working air pressure（mpa） | 0.5-0.7 | 0.5-0.7 |
| Average gas consumption | 22m³/min | 22m³/min |
| Applicable wellbore diameter（m） | ≥4 | ≥4 |
| productivity（m³/h） | 30～40 | 50～60 |
| Machine quality（kg）（With 1 grab bucket） | 7460 | 8150 |
| Grab Technical Parameters | ||
| Volume | 0.4m³ | 0.6m³ |
| Cylinder diameter | 500mm | 600mm |
| Piston stroke | 575mm | 575mm |
| Number of grabs | 8片 | 8片 |
| Grab piece open outer diameter | ≥1965mm | ≥2500mm |
| Grip closed outer diameter | 1210mm | 1600mm |
| Compressed air working pressure | 0.5～0.7mpa | 0.5～0.7mpa |
| Dimensions（Closed state） | φ1210×2200（mm） | φ1600×2500（mm） |
| weight | 1900kg | 2500kg |
