The screw jack is generally divided into trapezoidal screw jack and ball screw jack. Let's introduce the working principle and characteristics of the trapezoidal screw jack.

1. Drive Systems: DC motors 12/24V, single-phase AC motor, three-phase AC motor; no need for air or hydraulic power source.

2. Overload protection can be equipped with a safety clutch to prevent overload; it can also be fitted with an overload pressure sensor to prevent overload.

3. High load push/pull capacity up to 250 tons.

4. The self-locking function is generally found in electric push rods with acme thread and screw lifters, as they have a low power transmission, most of which have dynamic load self-locking capabilities, enhancing the safety of equipment operation; ball screw electric push rods and screw lifters do not self-lock.

5. Precision positioning: directional accuracy up to 0.1mm; servo electric cylinder directional accuracy down to 6um.

6. The configuration encoder is well manageable, achieving good positioning through a variable frequency drive or controller. For less stringent accuracy requirements, potentiometers can be equipped for on-line control.

7. The synchronous single-reduction motor drives multiple push rods simultaneously through mechanical coupling, achieving synchronized lifting and lowering.

8. The trapezoidal screw lifting machine, compared to other lifting machines, requires minimal maintenance, produces low noise, and can operate normally in both high/low temperature and corrosive/explosive harsh environments.

Key features include: self-locking function, synchronization, precision positioning, speed control, and thrust control.