The advantages of hydraulic engineering and pneumatic technologies have been multi-fold with thousands of applications in mega, medium and light industries. A relevant appliance is energised to function for which a mini compact power pack also known as DC power unit is in-built or integrated with the systems. A DC power pack supplies a voltage of fixed polarity (either positive or negative) to its load. Depending on its design, a DC power supply may be powered from a DC source or from an AC source like the power mains. These units that supply regulated and controlled power are meticulously designed, developed and manufactured. Several aspects such as safety, quality standards and also energy efficiency are kept in view during manufacture. Often these are also customised.
For instance, among the DC power unit manufacturers in India, the Delhi NCR-based Dantal Hydraulics has facilities for the entire range power units for numerous applications. It also makes AC/DC Mini Power Units. Some of them are:
- Dock leveller
- Electrical Stackers
- Emergency lowering
- Car Carrier
- Tier Changer
- Car Lift
- Scissor Lift
- Car Parking Systems
- Scooter and three wheeler Lift
- Customised Applications
In modern engineering, hydraulic power has given an impetus to the operation of various applications. Developments in this technology such as the concept of electro hydraulic actuator, EHA in short have further revolutionised the entire operation. Earlier hydraulic systems were energised by pumps which in turn called for tubing and allied parts. It was also observed that in the absence of safety in the design, the functioning of a pump was prone to hazards. Fortunately, the EHA has eclipsed these short comings and also improved the overall performance of hydraulic powered systems.
Primarily, the EHA was designed for applications in aviation particularly in a pilot controlling the aircraft’s speed and ailerons when airborne as well as on the ground. With drastic advancements witnessed in the size, capacity and speed of an aircraft, hydraulic engineers rose to the occasion and developed the electro actuator. In the principle on which EHA functions, motors with enhanced power drive a reversible pump that is linked to the hydraulic cylinder that renders the ultimate action.
This compact integrated system which includes the pump, the cylinder and a reservoir of hydraulic fluid, is packaged into a single self-contained unit. Initially, an EHA was made operational by modulated electrical pulses such as ‘fly-by-the-wire’ systems in aviation which have been replaced by the optics technology. Thus today, it is ‘fly-by-light’ concept. In addition to the lightweight, the EHA is instrumental in saving energy to a great extent. It draws power only when moved and the pressure is regulated internally when the motor stops.