14(33)
2. Structure Characteristics and Working Principle
2.1 Working Principle
SAL-U series of self-contained Hopper Loader is suitable for conveying plastic
granules. It mainly conveys materials by running the blower to produce differential
pressure inside the material hopper.
2.1.1 Working Principle Diagram of SAL-U-(CA)
Names of Parts
：
1. Blower cover
2. Blower
3. Material inlet pipe
4. Material hopper
5. Raw material
6. Non-return flap
7. Hopper base
8. Magnetic proximity switch
9. Indicator (red)
10. Indicator (green)
11. Control box
12. Auto dust cleaner
13. Solenoid valve 14. Air pipe connector
Picture 2-1: Working Principle of SAL-U-(CA)
After starting the machine, blower (2) begins to vacuumize material hopper (4). At
the same time, the non-return flap (6) is closed. Materials in the storage bin will go
into material hopper (4) from material inlet pipe (3) under differential pressure.
When material conveying is completed, the blower will stop working. Materials will
then fall down due to gravity. When magnetic proximity switch (8) detects that
there is no material left in the hopper, the solenoid valve (13) will open. Thus, the
air for cleaning will flow into auto dust cleaner (12) from the air pipe connector (14)
