Kates Playgorund Unscensor

simple pneumatic diagrams.

A pattern tire is a graphical representation of the set of pneumatic components, properly linked together, for the operation of a system handling. We will study the forms of tires trying to find solutions to real problems.

F4.2.1 handling of a gate - Solution 1.
Suppose we want to make a pneumatic system that allows you to open and close a gate by pressing two buttons (Fig. 3).
This problem can be solved in different ways and each solution requires the study to be analyzed before the elements necessary to achieve the required functions. For the movement of the gate is necessary that:

• you use an actuator, in this case a cylinder, able to open and close;
• that the cylinder can work in both directions.

The above conditions can be met by a double acting cylinder is positioned as shown in Figure 3.
The gate opens when the cylinder rod falls and closes when the cylinder rod is forced to leave. In other words, it is necessary that the flow of air under pressure alternately put the two chambers of the cylinder, also when a cylinder chamber is pressurized and the other must be discharging and vice versa. To reverse the flow using two selector valves that will be chosen to satisfy the above conditions.

In the first instance we can use two valves 3 / 2 NC monostable connected to the two cylinder chambers. Is obtained in this way the circuit diagram shown in Figure 4.

The V2 valve manually operated push button directs the flow of compressed air in the room right of the cylinder with consequent return of the stem moves the gate opening. On the contrary, the valve V1, which is also controlled manually, directs the flow of compressed air in the left chamber of the cylinder resulting in leakage of the rod that pushes the gate closes.
is easy to see that in both cases, when you release the button the cylinder chamber is not pressurized and the piston is not locked, that is pushing it moves. This is due to the fact that in the rest, the two valves connecting the chambers of the cylinder to exhaust. This situation makes us understand that we have found a solution to the problem proposed but we have not found the best solution.

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