Working Unit Of Automatic Pneumatic Lift - Online Article

The working unit is built up of fixed cylinders, sliding ram and platform. The two fixed cylinders used in the working unit are placed vertically and are connected to each other by a plastic pipe. The sliding ram is placed in one of the two cylinders mentioned above and on the outer end of this sliding ram, the platform is mounted. The platform is used for the purpose to carry the load which is to be lifted. This platform can be made of wood or steel, depending upon the magnitude of load.

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Fixed Cylinder

The two fixed cylinder used in the working unit are placed vertically and are connected to each other by a pipe. This pipe is used to transfer the force transmitting medium (oil) from one cylinder to another cylinder. Both the cylinders are made of mild steel and are fixed to the platform.

Sliding RAM

The sliding ram is placed in one of the two cylinders mentioned above and on the outer end of this sliding ram, the platform is mounted. The upward movement of the sliding ram is made by the exertion of force by the force transmitting medium (oil).

Force Transmitting Medium (Oil)

The oil filled in side the cylinder is used as the force transmitting medium. This oil transmits the force applied by the compressed oil, to the sliding ram. The grade of oil used in the cylinder is SAE 20.

Platform

The platform of the lift is mounted to the sliding ram and is used to carry the weight which is to be lifted. This platform may be made of wood or steel, depending upon the load which is to be kept. In this particular pneumatic lift the platform is of rectangular shape, made up of wood and is supported by sliding ram.

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Pneumatic Lift

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Motor & Compressor Unit (Front View)

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Motor & Compressor Unit (Top View)

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Pneumatic Lift (Top View)

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Pneumatic Lift (Side View)

Working Principle

The working of the pneumatic lift is based on Pascal's law. It states that the pressure or intensity of pressure at a point in a static fluid is equal in all directions. The pneumatic lift works on the principle that the effort required to move something is the product of the force and the distance the object is moved. By using an incompressible fluid to transmit the force, the pneumatic lift allows a small force applied over a large distance to have the same effect as large force applied over a small distance.

Working of Automatic Pneumatic Lift

When 220V ac supply is provided to the rectifier unit consisting of a half-wave and full-wave rectifier, the full-wave and half-wave pulse are supplied to the timer circuit. The timer circuit provides the pulse to the relay R1 for the time period which is defined by the adjusting knob. This relay R1 closes the circuit for that particular delay period and hence actuates the solenoid valve V1, connected to the relay R1. This solenoid actuated valve is placed at the inlet of the working unit. The time period, for which this valve is opened, it allows the compressed air from the pressure vessel to pass to the cylinder of the working unit.

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Hence the platform is lifted till this time period ends up. After this time period has ended up the valve V1 is closed and there is no further upward movement of the platform. In order to bring the platform down, the valve V2 is actuated by the relay R2 and the air inside the cylinder is released to the atmosphere.

Design Calculation

We have a pressure unit which give air at the pressure of 1-20 Kg/ cm, if we want to design the diameter of fixed cylinder which required to lift the desired mass.

Following is the calculation for cross- sectional diameter of the fixed cylinder:

Force = available pressure × cross-sectional area of the fixed cylinder

Also, Force = mass × acceleration due to gravity Area = 3.14× d/4

=> m g = p× 3.14 ×d/4

Now, Diameter, d = [(4 m g)/ (3.14×p)]

Available pressure, p = 10 Kg/ cm

Mass to be lifted, m = 10 Kg

Acceleration due to gravity, g = 9.81 m/s

Diameter = [(4×10×9.81)/ (3.14×10×1000)]

=> .03535 m = 35.35 mm

Specifications of Compositions of Components Used

Compressor Unit:

Electric motor .... 1.5 HP, single phase

Compressor ...... 200 pound=90.68 Kg

Pressure Gauge...0-50 N/ cm

Control Unit:

Relay ...... 6V DC, 100 ohm

Rectifier ...6V DC

Solenoid actuated Valve ....6V

Timer Circuit.......6V DC

Control Unit:

Relay ...... 6V DC, 100 ohm

Rectifier ...6V DC

Solenoid actuated Valve ....6V

Timer Circuit.......6V DC

Measures & Precautions

  • Proper pressure should be maintained in the compressor unit.
  • There should be no leakage of air and oil from the transfer pipe or cylinder.
  • The supply of voltage given to the circuit should be proper.
  • Excess load should not be kept on the lifting platform.
  • The delay time should be properly started with respect to the applied load.
  • The circuit should be prevented from water, as it may short the circuit.

Applications

The automatic pneumatic lift which we have made is a working model. But in practical applications it may be used for several purposes.

  • Pneumatic lifts are used in the garage to lift the vehicles for servicing.
  • It can be used for lifting people from one floor to another in a multistoried building.
  • It can be used for lifting the heavy pallets of CNC machines at the time of pallet changing process.
  • It can be used for lifting coal and other items from a depth of several hundred feet to the ground in an underground coal mine.

Conclusion

It is a well known fact that if anyone wants to make any new device or machine to reduce human effort, he must have the knowledge of its basic principles, innovative ideas and technique to implement those ideas and principles in a useful manner.

Making such type of machines can increase productivity of industries and advantage to needed people directly or indirectly.

If these working models are successful then many companies can give sponsorship to the project in order to assist financially. So we should think about new ideas and its useful applications in life.

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