SWL screw jack is composed of a worm gear reducer and a lifting screw, and its deceleration component is a worm drive, which uses the worm to drive the worm gear to achieve deceleration. The center of the worm gear is an internal thread structure, which is equivalent to the nut of the lifting screw and matches the lifting screw.
The drive modes of the screw jack include manual drive, motor drive, and geared motor integrated drive. Motor drives include AC motors, stepper motors, servo motors, etc., which are connected with screw jack through flanges. Shengjie’s Screw jacks with motors are widely used in various electric lifting platforms. In addition, the screw can be installed upwards or downwards according to different application requirements.
A. Hexagon socket head screw
B. Input cover
C. Oil seal
D. Oil drain plug
E. Worm gear box
F. Oil seal
J. Asbestos gasket
K. Grease nipples
L. Hexagon socket head screws
M. Output cover
N. Asbestos gasket
P. Worm gear
Main types of screw jack:
screw jack with hand wheel
screw jack with motor
screw can be installed reversely
|Worm gear||high quality 9-4 copper|
|Screw material||45# steel finishing|
|Housing material||HT250 cast iron|
|Bearing||high load bearing,
Chinese famous brand or C&U
|Oil seal||Chinese famous brand or NAK or SKF|
|Actual loading capacity||100-200kgs, 200-600kgs, 600-1500kgs, 1500-4000kgs…|
|Ratio||Ordinary (P)||Slow (M)|
|Structural type||Type 1 – the screw moves in both rotation and axial direction||Type 2 – the screw rotates while nut on the screw moves in an axial direction|
|Assembly type||Type A – screw (or nut) moves upward||Type B – screw (or nut) moves down|
|Screw head type||– Type Ⅰ,head cylindrical||– Type Ⅰ,head cylindrical|
|– Type Ⅱ,head flange|
|– Type Ⅲ,head thread||– Type Ⅲ,head thread|
|– Type Ⅳ ,head flat head|
|Protection of screw rod||– (basic type)||– (basic type)|
|– F (Anti-rotation type )||– Z (Type with protection shield)|
|– Z (Type with protection shield)|
|Max lifting load(Kn)||25||50||100/150||200||250||350||500||1000||1200|
|Stroke for one input turn
|Max permissible power(kW)||1.45||2.59||3.47||4.02||5.38||13.06||13.9||28.5||62|
|Weight per 100mm
screw & protective tube(kg)
Model selection guide:
step1: select the corresponding model according to your load capacity requirements,
step2: confirm the reduction ratio: 1/6, 1/12, or 1/24. If you need a special speed ratio, please contact our sales team.
step3: determine the head form of the screw, there are cyclinder type, nut type, flange type, thread type, flat head type for your option.
step4: confirm the screw length or stroke you need. The default stroke is 500mm, the screw length can be customized according to different needs.
step5: confirm the accessories you need, such as matching motors, hand wheels, protection tube for screw, dust cover, anti-rotation functions, nuts, etc.
Please contact us freely if you have specific requirements.
View Dimensions of SWLD screw jack, making sure the model is suitable for your installation space.