| 摘要 |
The solution concerns an automatic closing of air suction in machining tool linked to central exhaustion after its switch-off. In the inner space of the base body (1) connected to central exhaustion there is a closing valve (5). The inner space (A) under the closing valve (5) is pneumatically interconnected across and electromagnetic valve (16) with a space under a piston (10) of a control unit (11). The control unit (11) is mechanically connected with a closing valve (5) The piston is on its circumference arranged with clearance, as a result of which the space (B) under the piston (10) is pneumatically interconnected with a space (C) above the piston (10), where the space (C) is linked to atmosphere. The piston (10) is on its circumference equipped with a labyrinth (14). The closing valve (5) is in the inner space of the base body (1) suspended out of its axis and in the point above its suspension the base body (1) is equipped with a rectifying surface (3).<IMAGE>
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