LINEAR ACTUATOR

ELECTRIC LINEAR ACTUATOR: COMPONENTS AND APPLICATIONS

WHAT WILL WE SEE IN THIS ARTICLE?

Actuator Components
Parameters for sizing
Applications
Products

INTRODUCTION

Actuators are electromechanical devices for linear motion; They consist of an
electric motor which, directly or through the interposition of a gearbox, sets in motion
a threaded rod on which a lead screw slides. The lead screw, to be constrained to rotation,
realizes the linear displacement of the rod connected to it. The load, always and only in the axial direction
, can be applied in pull or push, regardless of the direction
of advancement of the rod. The actuators guarantee regular operation at no-load and load; in

depending on the speed they achieve and the loading mode, they can have a reversible or irreversible behavior
. In any case, it is possible to make the system self-locking.
Depending on the type of construction and the drive and control system, they can
function as simple ON/OFF devices in pull and push, or as servomechanisms.
Compared to pneumatic and hydraulic cylinders, actuators allow stops even in intermediate positions
of the stroke without special precautions, they also use electricity: a source of
clean energy, easily transportable, simplifying the lay-out of the machine board; there are
no spills of fluids (oil) which in some sectors (e.g. food, textiles) are a fundamental prerequisite
.

ACTUATOR COMPONENTS

How is the electric linear actuator made?

The linear actuator mounts an electric motor rigidly connected to a
worm gearbox and helical toothed wheel, or to a planetary gearbox with one or two stages or again,
without gearbox, connected directly to a threaded rod on which the lead screw that gives
movement to the translating rod slides. The whole therefore forms a rigid kinematic chain.

SIZING PARAMETERS

What are the parameters for the right sizing?

Load cycle (load trend along the stroke)*
Travel speed (speed trend along the stroke)*
*These two parameters must be evaluated considering the intrinsic characteristics, the
mutual influences generated by the progress of both during the work cycle, andimportant inertial phenomena. E.g.: if a high mass is moved with a speed
profile
characterized by abrupt accelerations and decelerations, the inertial load can be added to the
statistical value and this influences the sizing.

Service factor (% ratio between working time and cycle stop, on a 5min basis)
Environmental conditions (temperature, humidity, salinity, dust, etc.)
Usable actuator stroke
Supply voltage
Output speed (gearbox)
Output torque (gearbox)

APPLICATIONS

Where can I use linear actuators?

Applications

Agricultural machinery
- Atomizers
- Grain mills
- Woodworking machines

Ambulances
- Armored vehicles
- Caravan
- Railway Cars
- Van tents

Banking automation

Operating tables
- Dentist chairs
- Disabled/elderly equipment
- Retractable ladders
- X-ray machines
- Civil protection

Industrial washing machines
- Kitchens
- Dishwashing machines
- Air Duct Valves
- Diesel engines
- Paint mixing mixers
- Salt spreaders
- Steel plants
- Glass furnaces
- Tumbling machines
- Meat processing machines
- Nuclear plants

Snowmaking cannons
- Ski lifts

ALI1 used to control the placement of devices in washing and disinfection processes inside medical machines. Resin treatment for applications where water and high temperatures are involved.

ALI4DC linear actuator for application in an amusement park.

Matching wheel for dual-use linear actuators: both manual and electric. This is the case with automatic machines in the packaging sector.

ALI4 for photovoltaic system

EC2-F for ship lifting. The front and thrust axle are made of stainless steel; The bellows boot is used to protect against extremely corrosive agents such as water and salt.

PRODUCTS:

 LINEAR ACTUATORS
 MECHANICAL JACKS
 MOTORS
 ELECTRONIC BOARDS
 TELESCOPIC COLUMNS

The important customization service offers the possibility of adapting the product in detail to
what the customer requires, leading to a range of “tailor-made” and highly
innovative products.

Board for syncro, TEM motor, HT25+HR25 jack, drive shaft + couplings

Old ECV1 model for manual manoeuvring

Model ALI2

This application is pending the fitting of the protective sleeve.

For nuclear handling applications and systems. Model ALI4

Model ALI3 with old type of external limit switches (FCE), on request

ALI5-P, motor with Parallel positioning. It can be equipped with a limit switch and a manual release lever on a self-braking motor, PVC ceiling.

CAN WE REPLACE A HYDRAULIC SYSTEM? Here’s the proof

HRS200 for loads up to 20 tons. Equipped with limit switches, motor brake, anti-rotation device
and bellows boot, it will be used in harsh or harsh environments, in the processing of
concrete and raw materials.

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