Question

H. HYDRAULIC MOTOR DRIVE A. HYDRAULIC CLAMP CYLINDER B OOOO CLAMP UNIT -INJECTION UNIT Figure 6-1. Plastics Injection Molding Machine Your task is to design a circuit to control the injection molding machine. The control circuit should perform the following functions. • Pressing pushbutton 1PB starts the cycle. • The mold closes (cylinder 2 extends). • When the mold is closed (cylinder 2 extended), a limit switch is actuated. This causes plastic to be injected into the mold ( motor turns on) and timer starts timing

Answer 1

Dear student,

Here i given the electrical circuit diaagram for injection moulding process.

In this 4 timers used. I given eloborated uses of this timer under operation topic.

Here the timer used is a retentive type. which means it reset again.

Opereating Sequence

PB1 ON-----1CR ---------SOL 2A (Mould Closes)--------SOL A(Motor ON) -------T1(10 sec) --------T2(Cooling time) ------SOL B (Motor retracts) ---------------SOL 2B (Mould completely open) ---------- T4(Timer for ejecting sequence) --------SOL 1A (Ejector cylinder energises parallel with T4) - Cycle continues.

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Soln CIRCUIT OF INJECTION ELECTRICAL CONTROL MOULDING MACEHNE page 1 L2 Start LCR I PB1 PB2 Stop button I-CR.A Nc+2.CR. 2 HH Nooogte NO 1-CR The 225 SOL 2 A TI 12 Gramonto ILS SOLAB 7 of Norno 2L5 The SOLIA Emergency Stop

Sequence I-CR - Relay coll 1 il suori 2-CR- Relay coll 2 page 2 TI- Timer for to see T2 - Timer for Cooling T3- Timer of Motor retration T4 - Exectos Eylinder timing tomer operation - pressed; 1. Welthen PBI Ps I-CR energised it does latching A-CR-A at 1st ladder. confirmation No-ler get closes ; with 2. In 2nd ladder of T4 and 215 (Mould then energizer open Condition, SOL QA . which does mould to colore. 3. At the mould close 125 & closed and with the confirmation of T , SOLA . Energised which causes Motor on and inject plaste to die. 4. Aster 10 sec of injection. SOLA is deenergised, Stops the pastor. . As well as starts the second times. I? for cooling time 5. After Cooling To energized and closes "T2" No 5th ladder causes to energire SOLB. which Retard Moter for "T3" amount of time. 6. And with these confirmation Ils Limik switch (Mould is Clored) Energieser SOL RB causer Cylinder & ret (efects the party wolna Mould opened. 7. With Conformation 2 5 ; Mould in open poration, which energines SoLiA casous ejer cylinder efects le hlashe and Timer Ty energines för sequences. repato

8. Whenever the PB2 (Sto) is operated, Cycle Contina but at end of cycle. 9. For safety An emergency Stop is a deled, which Stop the cycle &mediately. page 3