Sharpest Chefs Knives

Example of automatic industrial.

Suppose we want to build a circuit that solves the problem of handling materials depicted in Figure 17. A box must pass by a conveyor belt to another. Identifies the following phases:

• 1. The tape T1 port box in position 1 and stop;
• 2. The stem of the cylinder A, activated by a start button, lifting the box out to position 2;
• 3. The stem of the cylinder B by pushing out the box on the tape T2
• 4. When the box is on T2 within the stem of A;
• 5. When he returned to T1 wakes up and is part B.

fig. 17 - System of a materials handling equipment.

Each cylinder must be equipped with two switches: A0 and A1 for the cylinder A, B0 and B1 for the cylinder B. The sequence to be generated is A +, B +, A-, B-and because, at rest, the stems are returned to their limits both A0 and B0 are active. Here are the phases of motion of the circuit:

• You press S connected AND with B0 à It generates the signal A +;
• The stem of the cylinder A, ended its run out, turn on the switch A1 generating the signal B +;
• The rod B, which ended its run, activates the limit switch B1 signal generating A-;
• The stem of A falls and activates the limit A0 signal generating B-;
• Finally the stem of the switch activates B B0;
• S Pressing the cycle starts again.

phases of motion can be represented graphically what is called phase diagram or Ciclogramma (Fig. 18). The x-axis shows the time and the ordinates Stroke.

fig. 18 - Diagram of the stages of the sequence A +, B +, A-, B-.

tab. 8 - Overview of the automatic cycle A +, B +, A-, B-.

lists the components required for the realization of the circuit:

• No 2-cylinder de;
• No 2 selector valves 5 / 2 bistable (one for each cylinder);
• No 4 limit switches (two for each cylinder);
• n.1 valves 3 / 2-button (Start button).

For the realization of the key components are placed from top to bottom, connecting the cylinders to the distributors on the latter indicating the control signals from switches, you mark the positions of switches and eventually complement other connections. The circuit diagram is shown in Figure 19.

fig. 19 - Schematic of the pneumatic circuit Materials handling.

As we saw last time, making the continuous loop of the circuit of Figure 19 by replacing the Start button, a mechanical memory circuit. The complete diagram obtained is shown in Figure 20.

fig. 20 - Schematic of the pneumatic circuit that performs the loop A +, B +, A-, B-. In line with current Joint control circuit Start / Stop.

Watch the video of the lesson.

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