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| The use of bevel gearboxes allows the distribution of drive throughout a jacking system. The gearboxes come in 2,3 and 4 way drive types. Bevel gearboxes and other system components can also be supplied in stainless steel or other corrosion resistant designs. Two of the most popular system configurations are the "H" and "U" configured jacking systems. Remember that multiple screw jacks can be linked together mechanically or electrically. The latter is useful if there is no space for linking drive shafts. If multiple ball screw jacks are connected in a mechanically linked system then the complete system in some designs may be considered self-locking. If you would like this checked consult us. Alternatively, to be sure, include a brake on the system either as a stand alone device or as a brake motor. | |||||||||
0.12 kW - 22 kW
JACTON
Product Description
Ball screw jacks are NOT self-locking so a brake motor needs to be included in the drive system and hand wheels are not a recommended option. If multiple ball screw jacks are connected in a mechanically linked system then the complete system in some designs may be considered self-locking. If you would like this checked consult us. Alternatively, to be sure, include a brake on the system either as a stand alone device or as a brake motor.
Worm Gear Screw jacks and Electric Cylinders can be supplied with industrial quality. They include a spring actuated, electrically released braking mechanism that holds a load when the power is off. In normal operation, power is applied and removed to the motor windings and brake release simultaneously. If multiple machine screw jacks are connected in a mechanically linked system then the complete system may be considered self-locking. Alternatively, to be sure, include a brake on the system either as a stand alone device or as a brake motor.
Single start trapezoidal type screws are typically self locking. Due to the large area of contact between the lead screw threads and the worm wheel, there is a large load carrying capacity. This results in high friction which is detrimental to efficiency but also means the system is more likely to be self-locking. In addition, the friction angle of the threads being greater than the lead angle, which also causes the single start worm jacks is self-locking. Which makes them safer than the hydraulic jack itself, for example, if the force on the hydraulic actuator is released accidentally, it will move backwards under load. Thus, simple, safe, as well as cost effective are the machine screw jack's greatest strengths.
Self-Locking - Gearbox: All screw jacks ratios are self-locking and will not backwind when power off. Standard ratio with trapezoidal spindles will remain self-locking when static (comes to rest), Low ratio worm gearbox will offer a dynamic self-lock and will slow and lock the moving load when powered off.
Secondary Safety – For lift systems for personnel; redundancy or secondary safety is required. Screw jacks can be offered with Self-locking jacks, Safety Nuts, Brake motors and even linear braking elements so a secondary safety measure is always in place.
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Speficications | Dimensional Drawings | Catalog
Application Case
We offers all of the components necessary to complete your power transmission system, whether it consists of a single screw jack actuator or a multiple screw jack actuator arrangement. We offer a complete line of accessories to interconnect two or more screw jack actuators and provide permanent synchronization. We's Application Engineers can specify shafts, couplings, pillow blocks, and right-angle miter gearboxes to accommodate any layout. Bellows boots to protect screw jack actuator screws from dirt and other contaminates are available for all screw jack actuators, to increase life and reduce maintenance requirements. Our extensive experience in actuator systems can provide you with suggestions for the most economical and reliable method to complete your lifting system.
Packaging and Shipping
* 100% standard exporting plywood cases (international exporting standard wooden material with free fumigation).
* Express(Air): Factory to customers' company by FEDEX, DHL, UPS, TNT. Incoterms: EXW, DDU.
* Sea Freight: Factory to destination seaport by Vessel. Incoterms: CIF, FOB, EXW, CFR.
* Air Freight: Factory to destination airport by Airplane. Incoterms: CFR, EXW, FCA, CPT, CIP.
* Additional Options (Door to Door): Train Transportation, Truck Transportation, Ocean Shipping.
