A method in a pneumatic oscillating device to observe an...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 15/24 (2006.01) F15B 21/12 (2006.01)

Patent

CA 2221173

The object of the invention is a method in a pneumatic oscillating device for observing an obstacle within the length of the work stroke and continuing the oscillating movement after this. The oscillating device includes a double-acting operating cylinder (1), a principal operating valve (6) controlling this, and a reversing valve (4), by means of which the principal operating valve (6) is controlled. A resistance to the flow on whichever return line (1.31, 1.41) of the operating cylinder (1) is in use, is arranged in order to maintain the return side pressure of the operating cylinder (1) at a level that is clearly higher than the ambient pressure during a work stroke in a normal situation, and sensing the pressure of the return side and, if it drops below a set limit, which is indicated by the movement of the pressure slowing or stopping completely, giving a command to the reversing valve (4) to change direction on the basis of this.

L'invention concerne un procédé utilisé dans un dispositif oscillant pneumatique pour observer un obstacle dans la longueur de la course de travail et poursuivre ensuite les oscillations. Le dispositif oscillant comprend un vérin de commande à double effet (1), une soupape de commande (6) principale qui régule ledit vérin et une soupape d'inversion (4) permettant de réguler la soupape de commande (6) principale. Il est prévu, sur l'une ou l'autre des conduites de retour (1,31, 1,41) du vérin de commande (1) utilisées, un système de résistance à l'écoulement qui sert à maintenir la pression côté retour du vérin de commande (1) à un niveau nettement plus élevé que la pression ambiante pendant une course de travail en situation normale. Ce système de résistance sert également à détecter la pression du côté retour et si elle s'abaisse et passe en dessous d'un seuil limite qui est indiqué par un ralentissement du mouvement de la pression ou un arrêt complet, ledit système donne un ordre à la soupape d'inversion (4) pour qu'elle change de direction en conséquence.

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