SU143089A1 - Device for filling electrical resistance tubes with conductive powder - Google Patents

Description

Devices for filling electrical resistance tubes with a conductive powder are known, including two bunkers and two movable punches. Punches serve to fill the tube with conductive powder at both its ends. A disadvantage of the known devices is the low feed efficiency of the powder.

In the proposed device there is no specified drawback. This is achieved by making each punch stepwise in the form of a rod with a needle at the end, and a cylindrical spring is inserted between the end of the rod and the wall of the hopper. The cylindrical spring works in compression, and its cavity, when idling, of the punch through the gaps between the turns, is filled with powder. The powder is supplied during the working stroke by the punch through the outlet openings in the wall of the hopper inside the packing tube.

FIG. 1 is a diagram of the proposed device for filling electrical resistance tubes with a conductive powder: FIG. 2 is a diagram of the tube filling process.

The proposed device has two bins / in which the conductive powder 2 to 3 of the required composition is contained. These powders may be the same or different in their nominal values and characteristics. In the latter case, the resistance as a whole can be obtained better.

Each bunker has an exit peephole against which pin 5 is placed on the prism 4. Inside the powder, rods with needles 5 and 7 move back and forth. At the end of each rod there is a spring 8, which with the second end abuts the butt of eyes No. 143089-2ka, forming an air spring chamber inside the powder. When the rod moves, the needle does not enter into the hole of the rod, but only comes to its end.

The diameter of the eye, as well as the diameter of the needle is much smaller than the diameter of the hole in the head.

Thus, during the reciprocating movement of the rods, the spring, squeezing, creates inside itself some increase in air pressure, due to which injection takes place, i.e., the powder is forced into the hole of the core both on one side and on the other. When the spring is opened, a slight vacuum of air occurs inside it, as a result of which a new portion of the powder is pulled from the bunker between the turns of the spring and the process repeats.

At the last moment, when the rod is filled with powder to failure, it is mechanically pressed from the ends of the needles, but since the needle diameter is much smaller than the diameter of the hole at the stem, the density of the layer is equalized over the entire length, and at the ends the powder is compacted by length 1 -2 mm, to form a good protection from the precipitation of it from the core, which is necessary for transportation and for subsequent operations.

The proposed method differs from the known methods of packing in that the introduction of the wires of the neck mass does not cause a strong wear of the parts of the mechanism, thanks to the elimination of friction between them. This method also provides a significant increase in labor productivity, since the packing is carried out simultaneously from the two ends of the liner. The method can be carried out using a simple device that does not require large expenditures.

The proposed device is recognized as industrially useful.

Subject invention

A device for filling electrical resistance tubes with a conductive powder, consisting of two bunkers and two movable punches for filling the tube at both ends, characterized in that, in order to increase the efficiency of the feed, each punch is made stepwise in the form of a rod with a needle at the end and between the end of the rod and the wall of the hopper, a compression spring coil is embedded, the cavity of which is filled with powder when the stroke is running during idle punch through the gaps between the spring coils with a punch through the outlet in the wall of the hopper inside the tube being filled with needle 2