Directional Control Valve: Port & Position..cont DEK 3113 i) Valve switching positions are represented by squares
ii) The number of switching positions of the valve is
shown by the number of squares
iii) Lines indicates arrow show the direction of flow paths iv) Shut off positions are identified in the boxes by lines at right angles v) The connection (inlet and outlet ports) are shown by lines on the outside of the box and are drawn in the initial position.
Several type of valve DEK 3113 Port or connection DIN ISO 5599 Lettering System Pressure port 1 P Exhaust port 3 R Exhaust ports 5,3 R,S Signal outputs 2,4 B,A
Numbering system for pneumatic circuit element
0.1 Air supply unit
1.0, 2.0 etc Working element (cylinder)
1.1,2.1 etc Control Element (solenoid)
1.01,1.02 etc Element btwn control element & working element-
DEK 3113 -rest position, air supply flowing to the cylinder piston rod via the valve and pushing the piston at rest/retraction position-no current flow to the solenoid -switch closed, energized solenoid coil-magnetic field develop at solenoid. -magnetic filed develop push the plunger and cause valve slide to the right. -this allow air flow inside the piston via the other port & push/extend the valve. -when switch released, current not flow, cause the magnetic field weaker and vanish-valve slide to initial position.
Basic circuit for electro pneumatic circuit DEK 3113 1) AND 2) OR 3) NOT 4) Memory latching 5) Dominant reset
The door of the automatic train will be locked if start button is pushed and will unlocked when sensor 1 detects it’s arrival at station 1. Sensor 2 that is placed at the entrance door of the train will count the number of train passengers on that day.
The tank system has the narrative description below:
Fill the tank to level A from valve A
Fill the tank to level B from valve B
Start a timer, heater and stirrer for 5 minutes.
Open output valve C until the empty switch engages.
Cont. DEK 3113 I/O assignment: input output LA - level A VA –valve A LB - Level B VB – valve B ES – empty switch VC – valve C TIM – timer contact(5 mins) TIM – timer coil(5 min) - times up after 5 min. - timer on for 5 min. SB - start button H – heater ST - stirrer
1) Presented in form of graph indicates the position of the cylinders and the displacement
DEK 3113 Step 1 : Cyl1 and Cyl 2 extend Step 2 : Cyl 1 retracts while Cyl 2 remains extend for 3 seconds. Step 3 : Cyl 1 remains retracts for 3 seconds and Cyl 2 retracts Step 4 - step 6 : The position of Cyl 1 and Cyl 2 similar as Step 1 – Step 3
7. In order to drill piece of wooden block, we need to use double acting cylinder A, B and C (5/2 way valve). When PB is pressed, cylinder A will push the wooden block until wooden block is detected by LS2 which cause cylinder C extend to hold the wooden block from move. When cylinder C at it full extension, cylinder B will extend. When LS3 detect the full extension of cylinder B, it will start doing drilling process for 10 sec. When finished drilled (after 10 sec), cylinder B will retract. When cylinder B is fully retract, cylinder A and cylinder C will start to retract.
: Assume traveling time for cylinder A, B, C from origin state to
full retraction/full extension is 2 second)
: Solenoid for valve A (cylinder A)-Y1 and Y2
: Solenoid for valve B (cylinder B) -Y3 and Y4
: Solenoid for valve C (cylinder C) -Y5 and Y6
DEK 3113 When PB is pressed, the robot hand move downwards until it detect by down sensor. Then, the gripper start to grip the “Load” until it is detected by grip sensor. After that, robot hand move upwards until it is detected by up sensor. Then, it move towards right until it reach the most right position as shown in Figure 2 above. After that, the robot hand move downward until it detect by down sensor. Then, the gripper start to ungrip (release) the load until it detect by ungrip sensor. Then, it move upwards until it detect by up sensor. Finally, the robot hand will moves to its original position (most left position). Cartesian Robot as shown above is used to transfer “Load” from point A to point C. It uses 3 different cylinders: Double Acting Cylinder (5/2 way valve) : Move down (activate Y1) and up robot hand (activate Y2). Single Acting Cylinder (3/2 way valve NC): Grip (activate Y3) and ungrip the load. Single Acting Cylinder (3/2 way valve NC): Move right (active Y4) and left robot hands.