17 (B) - STUFFER MACHINE

STUFFER MACHINE

Aim: To stuff the meat in a polythene casing and measure the power transmission elements of a stuffer machine.

Apparatus:
  1. Minced meat.
  2. Polythene casing
  3. Measuring scale
  4. Outside and inside caliper
  5. Tachometer
  6. Thread (Nylon)
Working principle: The stuffer machine is used to fill fish paste into the casing. In its working principle the power and motion from the electrical motor (i.e. driving shaft pulley) is transmitted to the driven shaft pulley by means of V belt. The driven pulley shaft has a gear at the end to rotate both the side connected gears. These side connected gears have a worm shaft at the centre to rotate worm wheel shaft. The worm wheel shafts have two cams to lift the vertical piston up and down to push the meat through the restricted nozzle.

Procedure:
  • Switch on the electrical motor before starting the work.
  • Put the minced meat into the bowl provided on the screw conveyor.
  • Collect the minced meat at the front of the screw conveyor sieve plate.
  • Switch off the machine.
  • Clean the screw conveyor, sieve plate with detergent and water.
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. Diameter of the smaller grooved pulley (cm)
7. Diameter of the bigger grooved pulley (cm)
8. Centre distance between the pulleys
9. Type of belt drive system used
10. No. of teeth on worm wheel
11 No. of threads on worm shaft
12 Type of belt used
13 Type of gear used
14 No. of blades
15 No. of belt used (No.)
16 Diameter of the bowl(cm)

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

4) Velocity ratio of a worm and worm wheel

= Rpm of worm shaft = No of teeth in worm wheel
Rpm of worm wheel No. of threads in worm shaft

Last modified: Monday, 9 August 2010, 7:23 AM