ME3242 Industrial Automation

ME3242 Industrial Automation

ME3242 Industrial Automation Reference Text: Lecturer: Please: Industrial Automation, by David W. Pessen John Wiley & Sons, 1990. Prof Poo Aun Neow [email protected] Room: EA-07-32 When emailing me, please indicate ME3242 or TM3242 in Subject. IA - Introduction

1 Sequencing with purely pneumatic logic Objectives: To learn to design purely pneumatic logic circuits for the sequencing of pneumatic cylinders so as to achieve automatic operation. We will learn to use two approaches: the Cascade Method and the Lucas Method. We will also learn about some miscellaneous topics in pneumatics such as speed control of cylinders, operational and emergency stop operations. IA - Introduction 2 Why Pneumatics?

Air is clean, convenient and readily available in the factory floor. No problem with exhaust. Preferred for small or medium-size systems where actuators are pneumatic cylinders. Often preferable to use same power medium throughout system, avoiding need for interface. Several methods available for systematic design of purely pneumatic sequencing systems. IA - Introduction 3 Review:- Pneumatic Cylinder with Flow-control valve For the 4/2 valve, only one box can be operative at any time.

The right(left) box will be in operation when the last pressure signal is -(+). If there is no pressure signal on either side, the valve remains at rest in its current position. There should not be air pressure signals to BOTH sides at the same time. 4 port, 2 position flow control valve, or 4/2 valve When the right (left) box is in operation, the cylinder retracts(extends). IA - Introduction 4

Review: Notation for specifying sequence Sample requirement: An automatic drilling machine is designed to have three pneumatic cylinders for automatic operation. A typical cycle of operation is initiated by actuating a START pushbutton. A clamp cylinder A then retracts thereby actuating a clamp mechanism to hold the workpiece. The drill cylinder B then extends to perform the drilling operation at the end of which it immediately retracts. The clamp cylinder A extends after which a third cylinder C extends to push the workpiece away and then retracts. The cycle is then complete. Description of sequence: START A+ B+ B- A- C+ CIA - Introduction 5

Notation: Important note By convention, A- is always used for the at-rest position of Cylinder A, and A+ the other position. Thus in any sequence, the first action of any cylinder X is always X+, i.e. moving from rest to the other position. Note that when at rest (initial state), a cylinder could be either retracted or extended depending upon the application. A + A - + A-

A+ IA - Introduction A- - A+ 6 End of Introduction IA - Introduction 7

Recently Viewed Presentations

  • Epistemology and Descartes - About people.tamu.edu

    Epistemology and Descartes - About people.tamu.edu

    Phenomenalism: physical objects are knowable, but only as bundles of sense data Naïve Realism: we do not perceive ideas or mental representations Idealism: George Berkeley (1685-1753) What we perceive is the real world, but the only things we perceive are...
  • When Men Batter Women: Insights Into Ending Abusive Relationships

    When Men Batter Women: Insights Into Ending Abusive Relationships

    Judith McFarlane et al., Abuse During Pregnancy and Femicide: Urgent Implications for Women's Health, 100 Obstetrics & Gynecology 27, 27 (2002). Akca Toprak Ergonen, Serppil Salacin, Sevgi Karademir, Yucel Gursel & Berna Musal, A Domestic Violence Course for Medical Students:...
  • Operating Systems - BGU

    Operating Systems - BGU

    The Ostrich 'Algorithm' - Ignore the problem. Deadlock Detection & Recovery - Detect a deadlock by finding a cyclic graph of processes and resources, and recover. Deadlock Avoidance - Detect safe and unsafe states; Banker's algorithm. Deadlock Prevention - Ensure...
  • Humanism and The Printing Press

    Humanism and The Printing Press

    Humanism and The Printing Press Unit 3, SSWH 9 c and g How did life change during the Renaissance and Reformation? SSWH 9 c and g Explain the main characteristics of humanism; include the ideas of Petrarch, Dante, and Erasmus.
  • Current trends in the delivery of developmental mathematics

    Current trends in the delivery of developmental mathematics

    Current trends in the delivery of developmental mathematics. Cheryl J. McAllister. Southeast Missouri State University. MO-MAA , 3/28/2014
  • Using the Annual Copyright License from CCC

    Using the Annual Copyright License from CCC

    Using the Annual Copyright License (ACL) Overview The Chicago School of Professional Psychology has entered into an agreement with Copyright Clearance Center, Inc ...
  • Harvesting, Searching, and Ranking Knowledge from the Web

    Harvesting, Searching, and Ranking Knowledge from the Web

    joint work with Shady Elbassuoni, Georgiana Ifrim, Gjergji Kasneci, Thomas Neumann, Maya Ramanath, Mauro Sozio, Fabian Suchanek My Vision Why Google and Wikipedia Are Not Enough Why Google and Wikipedia Are Not Enough Related Work Relevant Projects Outline High-Quality Knowledge...
  • ENMAT101A Engineering Materials and Processes Associate Degree of

    ENMAT101A Engineering Materials and Processes Associate Degree of

    Materials for Engineers and Technicians, 5th edition, Butterworth Heinemann. Ch 1.4.1 * The nucleus of the atom comprises protons and neutrons. To keep the atom electrically neutral, the number of electrons and protons must balance.