WORM GEAR SCREW JACK
The most common jack is the worm gear screw jack, also referred to as machined screw jacks because the acme, or trapezoidal, lead screw is machined.
What Is A Worm Gear Screw Jack?
In addition to the low cost and self-locking characteristics, another advantage of worm gear screw jacks, and all screw jacks, is the mechanical advantage achieved through the internal gear ratio resulting in the ability to lift, lower, push or pull a significant load with a relatively small amount of torque on the I/O shaft.
Worm gear screw jacks are very good in multiple jack systems, because the torsional deflection of connecting shafts and couplings has little effect on positioning. Under heavy load, worm gear screw jacks are not designed for high use or heavy duty cycle applications. They also suffer from low travel rates or speed and low efficiency. However, the lack of efficiency inherent in worm gearing produces the self-locking benefit associated with worm gear screw jacks.
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How To Use House Screw Jacks?
When a screw jack unit is operated, the rotation of the worm shaft causes the worm gear to rotate. For rotating screw jacks the lead screw is fixed to the worm gear and they rotate at the same speed. As the worm gear turns, the friction forces on the screw thread act to turn the nut also.
The greater the load on the screw jack unit, the greater the tendency of the nut to turn. It is obvious that if the nut turns with the screw, it will not raise the load. Therefore the nut needs to be fixed to a structure to prevent rotation.
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Which Type Of Screw Jack Should You Choose?
In order to know if a screw jack or screw jack system could be a solution for your application, you will need to consider which type of screw jack to select. There are worm gear screw jacks, bevel gear screw jacks and ball screw jacks, and each has several different options and configurations.
To determine the type of screw jack that is best for your application, you need to consider several factors, including: load, self-locking capabilities, travel rate or travel speed, efficiency, accuracy, duty cycle and price, among others.
Types
Types Of Screw Jacks
There are two main types of screw jacks:Electric worm gear screw jack,Manual worm gear screw jack.
Electric Worm Gear Screw Jack
An electric screw jack can also be called an motorized worm gear screw jack, which includes a worm gear screw jack and an electric motor. Screw jacks can be self-locking extreme screw jacks or high-precision ball screw jacks. Motor can be high precision servo motor, stepper motor, helical gear motor, worm gear motor, three-phase asynchronous motor and 12v, 24v, 48v motor and DC reduction motor, etc.
Manual Worm Gear Screw Jack
Manual worm gear screw jack (hand wheel worm gear screw jack, hand crank screw jack, hand operated screw jack) is driven by a hand wheel or crank or handle. The best advantage is suitable for heavy load, low speed, low service frequency. Our manual screw jacks have different configuration form and assembly type,and the lifting height can highly customized according to users’ demand, low cost and easy operation.
Are Screw Jacks Permanent?
Jacks can be used temporarily, to lift weight off of your foundation during the repair process. We also install foundation jacks permanently. There are times when the foundation is so old that it is impossible to repair the foundation completely.
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The advantages of electro-mechanical over hydraulic can be summarized by:
- Demand for increased safety, in the event of power loss, screw jacks can be self locking
- Demand for machinery that operates with better energy efficiency
- Demand for machinery that operates greater levels of precision
- Machinery that requires less maintenance
- Machinery that requires less manual intervention to set up processes
- Increased range of actuation in terms of variable positioning
- Accurate and smooth delivery of force
- Cleaner machinery
Screw jacks usually operate in high-load applications. The competing technology at high loads tends to be hydraulics; however, hydraulics are less energy-efficient than electro-mechanical actuation provided by screw jacks.
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