Oscillating Table

Abstract

Oscillating table in which the oscillation drive, comprising a hydraulic actuator, transmits the oscillating motion to the mould via a spring subject to bending stress, for example a fitted rod. The body of the hydraulic actuator is also anchored to the floor by means of a fitted spring subjected to bending stress. Thus thanks to the absence of any mechanical bearings in the drive mechanism, all disadvantageous movements caused as a result of bearing play, which increases at high oscillation frequencies, are eliminated. Moreover, the use of mould guide elements having a much simpler design and consisting of straightforward bars, also ensures greater guidance precision and enables a reduction in the oscillation marks on the cast product, a reduction that is even more noticeable when working at higher oscillation frequencies. Advantageously, the presence of an anti-roll device, consisting of two or more pairs of bars, for example two pairs, ensures good torsional rigidity of the table.

1 . Oscillating table comprising
 a mobile structure, mounted in a supporting structure integral with the floor, wherein the mobile structure comprises a mould ( 3 ) defining a first casting direction and being guided in an oscillation by first elastic members ( 6 ,  7 ) having an elongated shape and arranged transversely to the direction of casting,   a hydraulic actuator ( 4 ) transmitting oscillations to the mould ( 3 ), characterized in that there are provided two or more pairs of bars ( 12 ), arranged horizontally in a second direction basically transversal to the first elastic members ( 6 ,  7 ) and to the first direction of casting, whereby the table is provided with a predetermined torsional rigidity about an axis substantially parallel to the first elastic means.   
   
   
       2 . Oscillating table according to  claim 1 , wherein each bar ( 12 ) of each pair has a first end fastened to the mobile structure and a second end fastened to the supporting structure, in opposite order with respect to the corresponding ends of the other bar in the pair. 
   
   
       3 . Oscillating table according to  claim 1 , wherein there are provided second elastic members ( 13 ) connecting the mould ( 3 ) to the supporting structure that lighten the mould ( 3 ) and distribute its weight in a uniform manner. 
   
   
       4 . Oscillating table according to  claim 3 , wherein there is provided a third elastic member ( 5 ) clamped in place and connecting the hydraulic actuator ( 4 ) to the mould ( 3 ). 
   
   
       5 . Oscillating table according to  claim 4 , wherein there is a fourth elastic member ( 9 ) clamped in place and connecting the hydraulic actuator ( 4 ) to the floor. 
   
   
       6 . Oscillating table according to  claim 5 , wherein said third and fourth elastic members ( 5 ,  9 ) consist of a spring subjected to bending stress. 
   
   
       7 . Oscillating table according to  claim 6 , wherein said spring subjected to bending stress consists of a fitted rod. 
   
   
       8 . Oscillating table according to  claim 3 , wherein said second elastic members ( 13 ) consist of compression or air or leaf springs. 
   
   
       9 . Oscillating table according to  claim 1 , wherein said first elastic members ( 6 ,  7 ) consist of bars or leaf springs.