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For a labwork, I thought that if I invert the input signal, actually the input is a square wave and if I integrate this I can find triangular signal and after all if I clip from the wanted voltage I can create my circuit but I stuck at that point:

Note: I have to use LM324 while designing and the basic components like capacitor and resistor.

If you cannot see the picture link is as follows: https://drive.google.com/file/d/0B4tTqgQK4nGkLWd5dS0zVlZwV1U/view?usp=sharing

Cah you help me please? :)

Your question is unclear.

What exactly are you trying to do?

Describe the input.

Describe the expected output.

Think clearly about what you are trying to do.

If you are integrating a squarewave or pulse input think about what happens when that input is negative, positive and at exactly zero.

What is the initial state of the integrator (the voltage across C1)?

Hint: give both opamps +/-15V supplies. At the moment as soon as the input goes +ve, the integrator output is ramped down and hits the ground rail.

It is therefore not operating in it's linear region.

What is the purpose of the 2nd opamp?

:)