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Lim-Tec widely used

Leading technology

电话

Tel：010-87757706/87757858

Fax：010-87757857

Contact Address：Tongzhou District of Beijing the North off fluent Road north 5 km

The comparison with The hydraulic/pneumatic cylinder ：

Compared with the hydraulic/pneumatic cylinder, the electric actuator has its unique features: It does not need a complete support system (pump, valve, pipe, filter etc), thus saving lots of space. Also it can work safely and reliably without any maintenance. It is free from oil pollution and keep a clean and quiet working environment by reducing the noise substantially. Specific functions are as follows: Self-locking: The majority of the electric actuator and screw jack with acme screw has the absolute self-locking function under dynamic load due the low transmitting efficiency, therefore, increasing the safety of the device. Accuracy: the comprehensive accuracy can reach 0.1mm, while that of the servo cylinders can reach 0.1um.

accuracy：

the in-line control can also be attained by matching with potentiometer

Synchronousness：

Through mechanical connection to multiple actuators, one single motor can drive the multiple actuators up and down simultaneously.

Diving system：

DC motor 12/24V; single phase AC motor. Three phase AC motor

Over-load protection：

can be accomplished by matching with the safety clutch or the over-load sensor。

High load capacity：

up to 250 ton.Others

Others：

easy maintenance, low noise, work normally under the low/high temperature, corrosion-proof, explosion-proof environment.

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Exlar Roller Screws

Acme Screws

Ball Screws

Load ratings

Very High

High

High

Lifetime

Very long, many times greater than ball screw

Very low, due to high friction and wear

Moderate

Speed

Very high

Low

Moderate

Acceleration

Very high

Low

Moderate

Electronic Positioning

Easy

Moderate

Easy

Stiffness

Very high

Very high

Moderate

Shock Loads

Very high

Very high

Moderate

Relative Space Requirements

Minimum

Moderate

Moderate

Friction

Low

High

Low

Efficiency

>90%

approx 40%

>90%

Installation

Compatible with standard servo electronic controls

User may have to engineer a motion/actuator interface

Compatible with standard servo electronic controls

Maintenance

Very low

High due to poor wear characteristics

Moderate

Environmental

Minimal

Minimal

Minimal

 

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Hydraulic cylinders

Pneumatic cylinders

Load ratings

Very High

High

Lifetime

Can be long
with proper maintenance

Can be long
with proper maintenance

Speed

Moderate

Very high

Acceleration

Very high

Very high

Electronic Positioning

Difficult

Very Difficult

Stiffness

Very high

Very low

Shock Loads

Very high

High

Relative Space Requirements

High

High

Friction

HIgh

Moderate

Efficiency

<50%

<50%

Installation

Complex, requires
servo-valves, high pressure plumbing, filtering pumps, linear positioning and sensing

Very complex, requires
servo-valves, plumbing, filtering, compressors, linear positioning and sensing

Maintenance

Very high

High

Environmental

Hydraulic fluid leaks & disposal

High noise levels