11. VACUUM SEAMER

VACUUM SEAMER

Aim: To vacuum and seam one end seamed can and measure the power transmission elements of a vacuum seamer machine.

Apparatus:
  • One end seamed can
  • Tachometer
  • Outside caliper
  • Measuring scale
  • Seam cutting saw
  • Seam micrometer
  • Thread (Nylon)
Working principle: This is a semi automatic machine for seaming cylindrical cans. After filling the product the filled end is vacuumed and closed using the vacuum seamer. In its mechanism the rotating power required for seaming head can be obtained by pulling and engaging the front hand wheel shaft spur gear to the driven pulley shaft front spur gear or by electrical motor (i.e. driver pulley) to the driven pulley by ‘V’ belt. The driven pulley shafts have worm and worm wheel at the center and bevel gear at the end. The combined rotation of bevel gears of drive pulley shaft and vertical shaft of seaming chuck transfers the power to the seaming head, which have two sets of grooved rollers. The driven shaft also has worm and worm wheel arrangement at the center, wherein there is a short shaft at the center of worm wheel. Two cams have been fixed on both the sides of the short shaft. These cams and vacuum pump make the lifter to get lifted up and to create a vacuum in the filled can with the foot pedal in combined with the foot pedal. The vacuum pump is operated by a separate electrical motor. The vacuum seamer can seam 15to 20 cans per minute.

The machine is essentially consist of the following
  • Cast iron body
  • Electric motor
  • Vacuum pump
  • Seaming head
  • Lifter
Procedure:
  • The condition of the machine is observed and if necessary greasing, oiling and cleaning should be done.
  • Switch on the vacuum-pump starter button followed by vacuum seamer starter button.
  • Regulate the vacuum to 30 PSI by rotating the regulator valve of the vacuum tank(see the vacuum gauge in front of the machine)
  • Keep the filled can with lid on the lifter (base plate).
  • Engage the declutch lever.
  • Press the foot pedal once firmly and release it
  • Hold the lifter disc with two hands.
  • Remove the seamed can, once the lifter comes down.
  • Switch off the vacuum seamer and vacuum pump starter buttons after completion of the work.
Observation: Record the following observations

Sl.No. Parameters
1. Horse power of the motor (HP/KW)
2. Speed of the motor (rpm)
3. Diameter of the driver pulley (cm)
4. Diameter of the driven pulley (cm)
5. Speed of the driver pulley (rpm)
6. Speed of the driven pulley (rpm)
7. Center distance between the pulley (cms)
8. Reading of the vacuum gauge
9. Type of gears used
10. No.of gears used (No.)
11. No.of teeth on each gear (No.)
12. No. of grooved rollers used in the s. head (No.)
13. Groove thickness of the grooved rollers (cms.)
14. Type of belt used
15. No. of belts used (No.)
16. Type of belt drive system
17. Horse power at the pump (HP/KW)


Calculations:
1)
No. of teeth on driver gear
Gear ratio = ----------------------------------
Speed of driver gear

Speed of driven gear
= --------------------------------------------
No. of teeth on driven gear

2) 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

3) 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

4) 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, 7:17 AM