SWL series worm screw lift, also known as QWL lifts are widely used in machinery, metallurgy, construction, water conservancy facilities and other industries British spiral screw lift, with lift, drop and means of propulsion accessories, flip and a variety of height adjustment and many other features The head is divided into I (cylindrical), II (flange type), III (screw-type), IV (flat head type) four types. English spiral screw lift