The main power of sandblasting room system is 3~380v alternating
current power supply, control loop is 220v alternating current
power supply, the voltage is reduced from 380v to 220v for the
control loop by controlling the transformer. In order to reduce
interruption, the starting sequence interlock with one another,
that is, if the hopper doesn’t start, the spiral conveyor can’t
If the shot cycling system doesn’t start, the shot blaster can’t
start, if the shot blaster doesn’t start, the shot supply system
can’t start. The shot blaster or the booth door opens in the
maintenance status, the shot blaster can’t be opened. The shot
circulating system is set with the breakdown alarm functions, if
breakdown occurs in any part, the equipment will stop operation
automatically to prevent shot get stuck in the moving parts and
cause motor breaking accidents.
The base under the sandblasting room is set power socket with
The electrical system adopts S7-300 type programmable controllable
controller produced by Siemens to control integration, S7-300
series programmable controller is the latest product Siemens
developed, it has the features of fast process speed, stable and
reliable performance, convenient communication network. Contactor
and thermal condenser are all French Schneider products.
On controlling the fan, star-delta starting mode is adopted,
decrease the starting electrical current. In the aspect of safety,
overload, opposite direction, lacking phase protection functions
are set in the control return circuit, thus it can protect the
motor effectively, avoid damage of the motor as a result of
overload, opposite direction, lacking phase.
On the design of electric circuit, standard module is adopted as
much as possible, reduce the quantity of electric elements and
connections, minimize the breakdown source of electric control
Electrical junction box is set on each controlling equipment, for
equipment removal and mounting and maintenance of appliances.
All the switches, power system, motor, button, signal lamp, main
switch of the electric system are controlled and tested by control
cabinet. The control cabinet is set with two cooling fans, the main
circuit is partially installed with overload protection and leak
protection, when the circuit is short or leak, power can be cut off
The sandblasting machine is set with loading position alarm switch,
when the sand position detected by the system is higher than the
loading position, the alarm will be given by light and sound.
In the control cabinet and sandblasting room emergent stop switch
is set to stop the operation of the whole equipment quickly when
On the top and two side of sandblasting room, Philip metal halide
lamp, the lamp casing is 12mm toughened glass, with steel wire
netting shield outside. The lamp fully takes intensity of
illumination and comfortability into consideration, to make sure
the workers have a good working environment while operating.
The lamp installation strictly conforms to GB7248—87, indoors