FR2635337A1 - VIBRATION INSTALLATION FOR COMPACTING MOLDING MATERIALS - Google Patents

Abstract

This installation comprises a vibrating table, mounted oscillating on springs, to which an oscillation generator is connected. The oscillation generator is formed by a cylinder 6, 7, 8 with hydraulic or pneumatic control, whose piston rod 8 is connected to a mobile mass 9 and whose cylinder 7 is connected to the vibrating table 3, mounted on rubber springs 2. The invention is particularly applicable to the manufacture of carbon electrodes for the aluminum industry.

Description

The invention relates to an installation of

  to compact molding materials, especially

  particular for the manufacture of carbon electrodes for the aluminum industry, comprising a vibrating or oscillating table, mounted oscillating on springs, as well as an oscillation generator, connected to

this table.

  In vibration installations known hitherto, in particular for the manufacture of carbon electrodes for the aluminum industry,

  As a generator of oscillations,

  linked to the vibrating table, unbalanced masses turn-

  in the opposite direction, for example as described in

  German Patent Application DOS 34 45 936. Although.

  these counter-rotating masses make it possible, by varying the speed of rotation, to adapt the frequency to the value required according to the vibration or compaction process to be performed, the amplitude of oscillation can not be adapted to the compaction requirements of the molded part to be produced. To change the amplitude of oscillation, it was therefore necessary to stop from time to time the vibration installations known until now

  and equip the vibration generator with masses of

  Balanced changed as needed. But this way

  to proceed is not compatible with a

  tional. The object of the invention is to equip a vibration installation, of the type defined above,

  an oscillation generator that not only allows

  the free variation of the vibration frequency,

  but also the free variation continues, during the

  of the amplitude of oscillation of the installation

  lation. According to the invention, this result is obtained by the fact that the oscillation generator is formed by a jack controlled by a pressure fluid and oriented at least approximately vertically, whose piston rod is rigidly connected to a moving mass. and

  whose cylinder is rigidly connected to the table

  brante. By means of the cylinder, constituting the generator

  oscillations, the stroke of the piston and the mass of

  bile attached to the piston rod, so also the amplitude

  oscillation of the vibrating table, may be

  continuously and in a simple way. The gene-

  Oscillation generator according to the invention is suitable

  therefore especially for vibration installations

  for the manufacture of molded parts of di-

  relatively large and high density

  rent, in particular the manufacture of

  carbon for the aluminum industry.

  Other features and advantages of

  the invention will become clearer from the description of

  following example of a non-

  mitative, as well as the single figure of the appended drawing, which is a schematic representation of an installation

vibration device according to the invention.

  The drawing represents an installation of

  vibration for the production of

  bone for the aluminum industry. This installation comprises a vibrating table 3 mounted oscillating on

  rubber springs 1 and 2 and on which is

  placed a molding frame 4 surmounted by a weight of

  5. In accordance with the invention, a cylinder 6, 7

  double-acting is connected as an oscillator

  lations at the vibrating table 3; more specifically, the piston rod 8 of the jack is rigidly connected to a moving mass 9 and the cylinder 7 of the jack is rigidly connected to the vibrating table 3. An electrohydraulic distributor

  is fixed laterally to the cylinder 7 and makes it possible to

  very advantageous to introduce and evaluate the

  periodic cuation of the pressure fluid through the pipes 11 and 12 in the parts of the cylinder 7 located above and below the piston 6 to animate the moving mass 9 - connected by the piston rod 8 to

  piston 6 - periodic oscillations.

  During the operation of the vibration plant, these periodic oscillations of the mass

  mobile 9, acting in the vertical direction, are trans-

  vibrating table 3 and from there to the weight of recou-

  5 with a view to compaction of the materials 13 contained in the molding frame 4. With the aid of this oscillation generator made in accordance with the invention, the frequency and also the amplitude of oscillation can

  be changed very advantageously, during the function-

  the installation, so that the mas-

  oscillations can be adapted in a different way.

  the variation of the amplitude of oscillation is simply effected by the change of the stroke of the piston 6 in the cylinder 7, which stroke, like the frequency, can be prefixed using an electronic system (not shown) to control the electro-hydraulic distributor 10 or a distributor

  electro-pneumatic corresponding. Indeed, the vibra-

  This can be advantageously produced by a hydraulic fluid such as a pneumatic pressure fluid.

Claims (3)

  Vibration plant for compacting molding materials, in particular for the production of carbon electrodes for the aluminum industry, comprising a vibrating table mounted oscillating on springs, and a connected oscillation generator   at the table, characterized in that the oscillation generator   is formed by a cylinder (6, 7, 8) controlled by a pressure fluid and oriented at least approximately vertically, whose piston rod (8) is rigidly connected to a movable mass (9) and whose cylinder   (7) is rigidly connected to the vibrating table (3).   2. Installation according to claim 1,   characterized in that the oscillation generator is   formed by a double-acting cylinder (6, 7;   control valve (10) is controlled by an electronic system. 3. Installation according to claim 1 or 2, characterized in that the cylinder (6, 7, 8) is controlled   by a hydraulic or pneumatic pressure fluid.