Screw jack worm gears are widely used in industries such as machinery, metallurgy, construction, and hydraulic equipment, featuring functions like lifting, lowering, and adjusting heights with accessories for advancement, inversion, and various positioning. The screw jack worm gear is a fundamental lifting component with many advantages, including a compact structure, small size, light weight, versatile power sources, noiseless operation, easy installation, flexible use, multiple functions, various mounting options, high reliability, and long service life. They can be used individually or in combination to accurately control and adjust lifting or advancement heights according to a programmed sequence. They can be powered directly by an electric motor or other power source, or operated manually. They come in different structural and assembly forms, and the lifting height can be customized to the user's requirements. The device can also be self-locking.