Small part hot plate welding.
Application:-Weld two small plastic parts with the hot plate welding method.
Write the PLC program for the hot plate welding process using a ladder diagram
language.
Diagram:-
Explanation:-
Hot plate welding the method is a popular method for plastic part welding in the plastic industry.
Generally, two parts are melted at a certain temperature and joint together in
this method. We can use this method for two plastic parts welding.
PLC
program:-
Write the ladder program for the above application using
ladder diagram language. Here for ladder logic, we can use any supported PLC
system like S7-1200, S7-300, S7-1500 or any other PLC which can support this
instruction. For PLC logic we need digital inputs and outputs.
For our application start switch is digital input
and valves are the digital output. To define digital input address and output
address as per the below explanation,
Digital
inputs:-
Start switch S1=I0.0
Hot plate forward limit=I0.1
Hot plate reverse limit=I0.2
Digital Output:-
Hot plate forward=Q0.0
Hot plate reverse=Q0.1
Top servo forward=Q0.2
Top Servo Reverse=Q0.3
Network 1:-Hot plate forward
Network
2:-Hot plate forward reset
Network 3:-Servo forward on
Network
4:-servo forward reset
Network
5:-servo revere on and hot plate reverse on
Network 6:-Hot plate reverse off
Network
7:-Servo reverse off
PLC
program Explanation:-
In network 1, Start switch (I0.0) is pressed, hot plate forward output
(Q0.0) will on and hot plate moves forward.
In network 2, in this network when the hot plate will move till its
forward limit, once hotplate forward limit achieved, hot plate forward output
(Q0.0) will be off.
In network 3, Servo motor forward (Q0.2) movement will on when
hotplate achieves its limit.
In network 4, Servo motor (Q0.2) will be off when its set distance
limit achieved.
In network 5, both the function will happen simultaneously, when
melting time is over hotplate and servo motor will start to move reverse.
In network 6, hot plate reverse output will be off when its reverse
limit is achieved.
In network 7, Servo reverse command will be off when its set distance
value is achieved.