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Automatic electrical control system of sandblasting room

Electrical system

PLC electrical system in sandblasting room PLC electrical system in sandblasting room
PLC electrical system in sandblasting room
PLC electrical control for sandblasting room system

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 start. 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 security lamp.
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 system.

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 timely.

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 accident happens.

 

Lighting system
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 illuminance >300Lux.

 

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