Factory Wholesale SWL Series Worm Gear Screw Jacks Series Worm Gear Screw Jacks

JW screw elevators are mainly divided into two series: JWM type (trapezoidal screw type) and JWB type (ordinary ball screw type). The JWM type (trapezoidal screw type) is suitable for low-speed and low-frequency applications. Its main components are precision trapezoidal screw pairs and high-precision worm gear pairs. Its characteristics include compact structure, simple operation, and convenient maintenance. It is mainly used in places with high loads, low speeds, and no need for frequent work. The trapezoidal screw has an automatic locking function, which can maintain the load even without a braking device. However, when subjected to large vibration and impact loads, the self-locking function may fail, and an external braking device is required. JWB type (ordinary ball screw type) is suitable for high-speed, high-frequency, and high-performance devices. Its main components are precision ball screw pairs and high-precision worm gear pairs [1] [3-4]. Its characteristics include the use of rolling friction, high overall efficiency, relatively low required driving power, and the ability to output larger thrust. Compared with trapezoidal screws, it has a higher operating speed. Using ball screws helps to extend the working life, but it does not have self-locking function and requires an external braking device or a driving source with braking

JW screw lift has various assembly forms. The basic form (US, DS) is a common type of elevator with nut rotation and screw up and down movement, where US is for pushing up and DS is for lifting down. It needs to be selected according to the load direction and installation direction, and the screw shaft will generate rotational force during lifting, so measures must be taken to prevent rotation. The anti rotation structure (UM, DM) is suitable for situations where there is no connection at the top or where the rope cannot be prevented from rotating due to pulleys, where UM is secured and DM is suspended. The active nut construction (UR, DR) is suitable for situations where one wants to increase stroke in a limited space. The screw shaft rotates and the active nut moves, and the screw shaft is cylindrical. When the stroke is long, using a support method at the shaft end is more effective, where UR is pressed up and DR is suspended down. When selecting and indicating the model, it is also necessary to indicate the placement direction of the nut. JW screw lift has various assembly forms. The basic form (US, DS) is a common type of elevator with nut rotation and screw up and down movement, where US is for pushing up and DS is for lifting down. It needs to be selected according to the load direction and installation direction, and the screw shaft will generate rotational force during lifting, so measures must be taken to prevent rotation. The anti rotation structure (UM, DM) is suitable for situations where there is no connection at the top or where the rope cannot be prevented from rotating due to pulleys, where UM is secured and DM is suspended. The active nut construction (UR, DR) is suitable for situations where one wants to increase stroke in a limited space. The screw shaft rotates and the active nut moves, and the screw shaft is cylindrical. When the stroke is long, using a support method at the shaft end is more effective, where UR is pressed up and DR is suspended down. When selecting and indicating the model, it is also necessary to indicate the placement direction of the nut