HLA series combines the advantages of the proven HSE and ALSR ranges

At Motek 2007 in Stuttgart, Pfaff-silberblau will be launching its new series of High Performance Linear Actuators HLA. The HLA combines the advantages of the proven HSE range of High Performance Worm Gear Screw Jacks with the ALSR range of tubular Electromechanical Screw Rams. The HLA range is designed to meet growing customer demand for versatile and reliable drives for diverse applications, including tough ambient conditions.

The new HLA product has the same capable gear as the HSE series, and can be used as an individual drive unit as well as in multi-screw lifting systems. These linear actuators are available in two transmission stages each. They operate with lifting speeds between 0.025 m/min and 10 m/min depending on load, duty cycle and screw design.

The HLA also takes the shaft/thrust tube system from the ALSR series. which protects the shaft from fouling. In addition, the system is self-supporting, which means that the screw has a solid guide system, so that there is no need for the customer to supply separate screw guides.

From October 2007, Pfaff-silberblau will be offering its High Performance Linear Actuators HLA in three sizes - HLA 25, HLA 50 and HLA 100 with a maximum tensile/compressive force of 25 kN, 50 kN and 100 kN respectively. The range will soon be supplemented by an HLA 10 10 kN version.

A standard fitment of the HLA is a self-locking trapezoidal thread screw and an anti-turn device. Due to the high quality of the lubricant used, HLA Actuators require very little maintenance, usually only re-lubrication in line with the duty cycle and availability. The stroke lengths of the HLA are standardized; but special stroke lengths can also be produced to customer requirements.

In addition to the standard features, a series of options are available: For example, the trapezoidal thread screw can be replaced with a ball screw. Also available are various head designs, inductive or mechanical operating and safety limit switches and safety nuts. This will also enable the use of HLA in lifting systems which are subject to EN 1570, EN 280, EN 1756 and EN 1493 requirements. The scope of application of the new HLA series is increased by a wide range of attachments, such as swivel mounting bases, swivel plates and motor mounting flanges.

The model shown below consists of two individual drives HLA 25 with three-phase motor and frequency converter and will be synchro-controlled by master/slave operation. The control concept for the application was also developed by Pfaff-silberblau.