15. SEMI AUTOMATIC SLICER

SEMI AUTOMATIC SLICER

Aim: To make slices of the pineapple and measure the power transmission elements of a semi automatic machine.

Apparatus:
  1. Measuring scale
  2. Outside and inside caliper
  3. Tachometer
  4. Thread (Nylon)
Working principle: The machine is used to make pineapple slices which has domed shape unit at the top. The domed units have cutting blade with slice pusher and two ellipse shape holes for the exit of slices at the bottom of the domed unit. At the top of the dome unit there are two cylindrical opening to feed the sized pineapple and two-water inlet to feed water.

The rotating power from the electrical motor (i.e. driver pulley) is transferred to driven pulley by ‘V’ belt, which has center shaft with small bevel gear at the end. The ;small bevel gear engaged with big bevel gear, which has center shaft to rotate the cutting blade with slice pusher ;to cut and push the slice through ellipsed shape holes. The pineapple feed into the cylinder opening manually.

The machine is essentially consists of the following parts.
  1. Electrical motor
  2. Bevel gear unit
  3. Cutting and feeding unit
  4. Water pipe line connection
Procedure:
  • Switch on the electrical motor before starting the work.
  • Keep the water-inlet pipeline tap open.
  • Feed the sized pineapple on both cylindrical opening provided at the domed unit.
  • Collect the sliced pineapple at the bottom of opposite passage exit ends of the domed unit.
  • Clean the machine with water after completion of the operation.
  • Switch off the machine after completion of the operation.

Observations: Following observations have to be recorded.

Sl.No. Parameters
1. Horse power of the electrical motor (HP/KW)
2. RPM of the electrical motor (rpm)
3. RPM of the driver pulley (rpm)
4. Diameter of the driver pulley (cm)
5. Diameter of the driven pulley (cm)
6. Type of belt used
7. No. of belt used (No.)
8. Type of gear used

Calculations:

1) Velocity ratio of belt drive

N2
= ------------
N1
d1
= ------------
d2
Where,
N1 = Speed of the driver in rpm
N2 = Speed of the driven in rpm
d1 = Diameter of the driver in cm
d2 = Diameter of the driven in cm

2) Length of the belt
(r1 – r2)2
L = (r1 + r2) + 2x + ------------
x

Where,
r1 = radius of the driver pulley in cms
r2 = radius of the driven pulley in cms
x = distance between the center of the pulley in cms

2 π NT
HP = ------------
4500

3) Diameter of the shaft

π
T = ------fsd3
16
Where,
Fs = Shear stress in Kg/ cm2
T = Torque in Kg-m
N = rpm
HP = Horse power
d = Diameter of driver shaft in cms

Last modified: Monday, 9 August 2010, 7:20 AM