screwjacks

Worm Gear Screws Jacks can provide long duty life, high load capacity and flexible design. Its two major categories ball screw jack and acme machine screw jack are common used screw jacks. How to determine which one is suitable for your application? There are some tips for you. Ball Screw Jacks use a ball screw and nut made from hardened alloy steel with bearing balls carrying the load between nut & screw. This rolling action reduces the friction between nut and screw, permitting smooth and efficient load movement that requires approximately 1/3 less torque than a machine screw jack with the same load. Machine Screw Jacks incorporate an alloy or sometimes stainless steel worm which drives a high strength bronze worm gear, or drive sleeve. The worm shaft is supported on anti-friction tapered roller bearings with external seals that prevent lubrication loss. The drive sleeve can also be supported on tapered roller bearings, or ball thrust bearings. Rotation of th

A slewing drive is a gearbox and it can safely hold radial and axial loads, as well as transmit a torque for rotating. The rotation can be in a single axis, or in multiple axes together. Slewing drives consist of  gearing, bearings, seals, housing, motor and other auxiliary components. A quality modern slewing drive includes a sound mounting structure, a slew bearing, rotational movement and power controls to facilitate perfect motion. In operation, the drive converts axial movement (force exerted on an axis) into radial/rotary torque, allowing the rotation of greater loads with more accuracy, while also enabling geared torque amplification. The slewing drive does this by meshing the grooves of a horizontal screw (the worm) with the teeth of a gear placed perpendicular to the screw. The gear rotates as the screw turns, and the screw’s axial movement force is then transmitted to the radial gear as magnified output torque. The physics of the slew drive makes it a

How to install and maintain the screw jack after you receive it? Do not worry. We have some suggestions for you. Installation The screw jack(no matter trapezoidal screw jack （ self locking screw jack ） or ball screw jack ) must be installed in a manner that does not create lateral loads on the threaded spindle. If possible, use some guides to protect the jack.Great care must be taken to ensure that the threaded spindle is orthogonal to the mounting plane, and that the load and threaded spindle are on the same axis. Employing multiple screw jacks to handle the same load requires further verifications: it is critical that the load support points, (the end fittings for TP models and the lead nuts for TPR models), are perfectly aligned in order that the load can be uniformly distributed; otherwise the misaligned screw jacks would act as brake or counter-load.Whenever several jacks have to be connected by means of transmission shafts, it is recommended that they be perfectly

On Aug.9th, we talked about how to install the screw jack.Now l’ll talk something more about the installation. That is about screw jack alignment . Screw jack has the ability to turn rotary motion into tremendous linear force, within a compact envelope, is one of the miracles of mechanics.However, properly integrating a screw jack into a specific piece of machinery is no small feat. Beyond the actual selection of the appropriate size and configuration the mounting of a screw jack takes special care. Screw jacks can take very little side load. Therefore any side forces, either from weight or misalignment, must be minimized or eliminated. This is usually accomplished by guiding the load with rails, rollers or linear bearings of some type. It keeps the load moving in the intended direction without undue strain on the nut, or internal threads in the case of a traversing spindle, from something other than the axial load it needs to move. Aligning the guides to the jack (