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            Bilz Vibration Technology, Inc.

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Vibration Isolation Pad Materials

Leveling Feet / Elements

Precision Leveling Wedges

FAEBI^® Rubber Air Springs 5 Hz

BiAir^® Membrane Air Springs 1.5 Hz

Active Isolation Systems-AIS™

VITAP^®                                               

Isolated Tables/Platforms

Isolation Systems for Test Stands

Isolated Machine Foundations

Vibration Measurement

BiAir Membrane Air Springs catalog pages 24-26

Low natural frequency air spring with adjustable dampening (pat.) for vibration isolation of metrology and testing equipment, optical and electronic equipment, laser machines, precision machining, vehicle and motor test stands, etc.

BiAir^®

The Air Spring Isolator BiAir^® consists of either a steel or cast aluminum body whose air volume is enclosed by a thin-walled, flexible and pressure-resistant rolling diaphragm. The piston is seated on this diaphragm and is pushed into the air volume.

This design causes highly effective vibration isolation.  In order to obtain as high a dampening effect as possible, the air space is split into two chambers (load and dampening volumes) that are connected by an air tube.  The amount of dampening can be easily changed by the adjustable orifice located on the outside of the air spring.  As the load on the air spring changes, air is forced through the adjustable orifice  creating friction.  This friction creates up to an 18% dampening effect.  An additional safety valve protects the rolling diaphragm from getting damaged by over inflation.

Highly effective vibration isolation of sensitive measuring (CMM) and testing machines, precision machining, as well as optical and electronic equipment. Another important range of application is the vibration isolated foundation of vehicle, motor and other performance testers.

BiAir^® Air Spring isolators are extremely well suited for the isolation of precision equipment installed on concrete inertia blocks.  Air springs with higher maximum loads as well as air springs with lower natural frequencies can be supplied upon request!

BiAir^® Air Spring Isolators with level control is a passive isolation system with self leveling.  The vibration isolated machine maintains its level with continuous automatic re-leveling adjustment.

Level control is an important part of an optimally functioning air spring system. The automatic level controller can be utilized to overcome the problem associated with load changes in air spring isolated machines, which can result in tilting of the machine.

The height of the specific elements BiAir^® or FAEBI^® can be controlled by changing the air pressure in the air spring isolators. Quick inflation or deflation will hold the machines level even if their center of gravity keeps changing.

The circuit consists of at least three air springs. If more air springs are needed for structural or loading reasons, the system must always include 3 position points, e.g. three level controllers to avoid being in a statically indeterminate condition . This is achieved by connecting sets of air springs in parallel.

                           BiAir^® MPN level controller system

The mechanical-pneumatic control valves are a simple yet effective solution. The level is constantly scanned by a plunger. The plunger position is transmitted to a spool valve. Depending on the spool valve position, pressure is either applied to the air spring or vented from inside of the air spring. The machine level can be maintained at an accuracy + 15 microns.  Typically three control valves are used. The incoming air supply is conditioned with a pressure regulator to limit system pressure to a maximum of 6 bar and with a water trap to remove vapor and an air filter to remove dust and any foreign bodies from the air supply.

BiAir^® Electro-Pneumatic positioner / controller

Important advantages of the BILZ level control are: 

• High reset accuracy e.g. level accuracy of ± 10 microns

• Extremely short reaction time (within the milliseconds range) 

• The general possibility of being able to optimally adapt (increase and reset) the speed of the system to the specific conditions (control circuit) 

• Wear resistant and sturdy relief valves 

• Simple and effective set-up operation

Each system consists of 3 position sensors, 3 electro-pneumatic control valves, one control unit (digital computer logic), the pressure regulator and filter units.  Even the most severe conditions are mastered by the electro-pneumatic positioner. It is used mainly where high reset precision and extremely short reaction times are required.  Any deviation (difference between desired value and actual value) from the desired height (desired value) of the air spring isolator is measured at a precision of up to + 10 micron accuracy by means of position sensors.  In the control unit, these electronic signals will then be processed and the air spring elements will be inflated or deflated accordingly for level equalization via the pneumatic control valves.

The control unit consists of a printed circuit board, containing the entire logic of the 3 control circuits, 3 air pressure gauges for the air springs, adjusting screws for the adjustment of the machine, selection  of the controller speed, and a switch to enable complete deflation of

the air springs. The control unit can be supplied either as a 19 inch rack mount unit or completely enclosed within a cabinet.

As an optional feature, a special software package is available. By means of this software, the adjustment and optimization of controlled conditions, the registration of adjustment parameters as well as error determination can be carried out via the serial interface (serial interface provided on the control unit). Furthermore, the integrated serial interface enables a connection between available machine computers or systems to be isolated. A number of more complex system modes can be realized this way.