DE2657535B1 - Ready-to-connect drum made of metal or plastic in polygonal or cylindrical shape - Google Patents

Description

The invention relates to a ready-to-connect drum made of metal or plastic in polygonal or Cylindrical shape with recesses provided in the drum surface for treating metal Small parts as bulk goods.

It is known to subject small metal parts to a treatment before they are used. Under treatment, z. B. electroplating, pickling, phosphating od. Like. Understood. The treatment the small metal parts, which are usually produced in bulk, are carried out in the drum. The small parts are first entered into the drum and then, together with the drum, into the Treatment bath let in; the drum rotates

Since the small parts to be treated are different in terms of their size, the Treatment intensity and treatment duration, the recesses provided in the drum surface in different Size executed. However, this has the disadvantage that when changing the size of the small parts The drum must be replaced, e.g. a drum with small recesses must be used for small small parts are used in the drum surface. The re-equipping of the drums is time-consuming and does not correspond to the goal of an optimal process technology.

To counter this disadvantage, one already has drums with large bores in the drum surface manufactured and set in these holes to reduce the size of the holes in the case of small ones to be treated Small parts so-called sieve stoppers. But even with this measure there is the problem mentioned above not yet fully taken into account, because the insertion of the strainer plug into the bores is still with is associated with a relatively large expenditure of time. Apart from this disadvantage, that also compels The system of reducing the size of the bores by means of sieve plugs still leads to an expensive storage.

The present invention has therefore set itself the task of producing a sieve drum of the type mentioned at the beginning to design so that at any time an adjustment of the size of the recess in the drum surface as a function

from the optimal processing time.

To solve this problem it is proposed according to the invention that in a parallel arrangement to the On the outside of the drum surface, a drum surface that can be displaced in the drum axis and is also provided with recesses is provided. The provision of a second outer drum surface with corresponding recesses, which can be moved in the axial direction has the advantage that by moving the outer Drum surface an enlargement or reduction of the recesses through which the Treatment medium can enter is possible. It is therefore both an adaptation to the various Sizes of the small parts to be treated as well as an adaptation to the optimal processing possible. A It is no longer necessary to retool the drums when filling in larger or smaller small parts to be treated required, which results in a significant reduction in set-up times. Only the external one is required Drum surface in the direction of enlargement or reduction the passage recess are moved.

In the case of an electrolytic treatment of the small parts, the aforementioned advantages are supplemented in particular further proposed with regard to better power supply and better electrolyte exchange, that the recesses of the inner drum surface on the inside of the drum and the recesses of the axially displaceable parallel drum surface are chamfered on the outside.

Based on the figures shown in the drawings, the invention is based on a Embodiment described in more detail. It shows

F i g. 1 in a perspective view of the invention Drum, the recesses in the

stationary drum surface and the axially displaceable Drum surfaces are congruent on top of each other,

2 shows a plan view of a partial drum surface, the upper drum surface being displaced in relation to the lower drum surface,

3 shows a section along the line II-II in FIG. 2.

As can be seen from the figures, has the drum is hexagonal in cross section. Recesses 2 are provided in the individual stationary partial areas 1 intended. Are parallel to the stationary partial areas 1

'* ⁵ further sub-surfaces 3 are provided axially displaceably on the outside and likewise have recesses 4. The movable sub-area 3 is connected to the stationary sub-area 1 via corresponding screw connections 5. When the sub-areas 3 are moved, the screw connections are released and the sub-areas 31 are axially displaced in elongated holes 6. Instead of this possibility of fastening the movable partial surfaces 3, there is also the possibility of moving these surfaces in appropriate guides and

to be connected accordingly to the stationary partial area 1.

As can be seen in particular from FIG. 3 can be seen, the recesses of the stationary partial surfaces on the Inside of the drum chamfered, while the recesses on the axially displaceable parallel drum surface 3 are chamfered on the outside. The advantages of this constructive measure have already been mentioned above.

For this purpose 3 sheets of drawings

Claims (2)

Patent claims: 1. Ready-to-connect drum made of metal or plastic in polygonal or cylindrical shape with in the drum surface provided recesses for treating small metal parts as Bulk goods, characterized in that in a parallel arrangement to the stationary drum surface (1) on the outside a displaceable in the drum axis also provided with recesses (4) Drum surface (3) is provided 2. Drum according to claim 1, characterized in that that the recesses (2) of the stationary drum surface (1) on the inside of the drum and the recesses (4) of the axially displaceable parallel drum surface (3) are chamfered on the outside.