Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
ESCUELA DE POSGRADO
Curso: Proyecto de Sistemas de control Tema:
Proyecto de máquina neumática
Presentado por: CONTRERAS MARTI MA RTINEZ, NEZ, DIMEL ARTURO ARTURO
Docente: Ing.Edwin Avila Cordova
2016
1
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Proyecto : Maquina Neumática para el doblado de planchas delgadas
Se propone una máquina para el dobl ado de planchas siguiendo un molde, tal como se muestra en la sigui ente figura 1. 1.
Fig.1 Maquina Maquina dobladora dobl adora de planchas La máquina utiliza como actuadores 3 pistones de doble efecto, que poseen los siguientes finales de carrera: Pistones A B C
Final carrera carrera contraído contraído Final de carrera carrera extendido A0 A1 B0 B1 C0 C1 Tabla 1 Pistones y finales de carrera
La secuencia a seguir son las siguientes:
Se activa con un pulsador la secuencia de doblado.
La activación del pulsador activa un temporizador neumático tipo TON.
Luego del tiempo T(5seg) T(5seg) se ex tiende el pistón “A”.
Al lle gar el pistón “A” al fi nal de carrera carrera A1, se extiende el pistón pi stón “B”.
Al lle gar el pistón “B” al final de carrera B1, inmediatamente se contrae.
Al lle gar el pistón “B” al fi nal de carrera carrera B0, B0, se extiende e xtiende e l pistón “C”.
Al lle gar el pistón “C” al final de carrera C1, se contrae el pistón “A” y “C”.
Luego de que el pistón “A” y “C” se contraen, contraen, se repite el ciclo.
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Consideración:
Se considera que cuando la plancha ha sido doblada pasa un tiempo ti empo “T” para que la plancha pl ancha doblada sea retirada y se ingrese i ngrese una nueva plancha por doblar. Luego prosigue el ciclo. ciclo . Circuito Ne umático: umático:
Utilizando el método de Karnaugh se obtiene obti ene el siguiente circuito neumático que cumple con la secuencia secuenci a requerida. Se dividen en 3 grupos grupos :
Grupo U : A+ B+
Grupo V: B- C+
Grupo W: A- / C-
Además se considera el temporizad te mporizador or al inicio de cada ciclo.
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Nive les del circuito circuito neumático:
Fig.4 Niveles del circuito circuito neumático
Debido a que q ue los el ementos que proporcionan proporcionan señales de control control y la l ógica de los grupos j unto unto con el temporizador están muy relacionados, se formó un nivel que abarque a los dos niveles mencionados (seña (se ñales les y lógica).
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Simulación:
Se realiza la simulación en el Software Software FESTO FluidSIM Pneumatic. Pneumatic. En el estado inicial inici al del circuito neum ático, ático, los 3 pistones están contraídos contraídos y el temporizador tempori zador en estado de reposo.
Fig.5 Inicio del circuito neumático
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Al presi onar el pulsador pul sador (sin retorno por muell e) se presuriza el temporizador temporizador por la línea 12. 12. Luego que pase el ti empo Seteado Se teado en la válvul a temporizadora temporizadora enviará enviará presión a la línea de A+.
Fig.6 Presionado Presionado del botón e inicio del ciclo
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Al ex tenderse el pistón “A”, se activa el final fi nal de carrera carrera A1, tal como se muestra en la figura 6.
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Al activarse el final de carrera A1, se activa la v álvula 3x2 que presuriza la línea B+. B+. Al presurizar la válvula válvul a 4x2 4x2 en la l ínea B+, B+, se extie e xtiende nde el pistón pist ón “B”.
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Al ex tenderse el pistón “B”, se activa el final de carrera B1 y se habili ta el grupo “V”. Al habili tarse tarse el grupo “V” se presuriza la línea B- de la válvul a 4x2, con lo cual el pistón “B” se contrae.
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Al contraerse contraerse el pistón “B” estando en el grupo grupo “V ”, se ex pande el pistón “C”.
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Al expandirs ex pandirse e el pistón “C” se activa el final fi nal de carrera carrera C1, ésto hace que se pase al grupo “W”. Al habilitarse el grupo “W” automáticamente automáticamente se contrae el pi stón “A” y pistón “C”.
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Diagrama de estados:
El di agrama agrama de estados es la se cuencia de movimiento movim ientoss que siguen los l os pistones: pistones:
Fig.12 Diagrama Diagrama de estados e stados Recursos neumáticos utilizados:
Actuadores 3 Pistones Pi stones de doble efecto
Válvulas de control control 3 válvulas vál vulas 4x2 ó 5x2 ( para los 3 pistones A – B B - C)
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Implementación:
La selección sele cción de los el ementos ementos necesarios, necesarios, se realiza de acuerdo a las dimensione dimen sioness y potencia de la máquina. Como ele mentos referenciales referenciales para una posterior selección más detallada detal lada son:
Pistón de doble efecto: efecto:
Fig.13 Pistón de doble efecto FESTO
Válvulas Válvul as 4x2: 4x2:
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Sistemas Ne umáticos umáticos
Proyectos de Sistemas de Control
Válvula pulsador
Fig.16 Válvula 3x2 activado por pulsador
Válvula Válvul a temporizadora temporizadora
Fig.17 Válvula 3x2 con temporizador
Unidad de mantenimiento