FR2783438A1 - Teaching device for recovering aluminum waste and/or heating experimental samples comprises electric furnace at low voltage - Google Patents

Abstract

The teaching device intended for the fusion of metal wastes, in particular drink can rings, or for heating test tubes or other experimental material, comprising an electric furnace at low voltage (F), typically 24 Volts, of small size, heating a body with a vertical axis mounted with a removable stopper (B) made of refractory earth at its base. The fusion is achieved in a Pyrex glass test tube fixed on a mold (M) in a vertical position with a handle (P). The stopper (B) is at the base of the furnace and the fusion is limited to several minutes. During the fusion, the mold assembly and test tube is held in the vertical position using a support at the top of the furnace. The melted material is cooled by turning the mold and test tube by the handle so the mold and tube are resting on the support (S) during cooling. Test tubes or other material are heated in the body with the stopper removed, and heating is carried out using the hot air produced by natural convection in the furnace and the more intense heat in the center of the furnace, whose dimensions are selected for this result. The furnace has an external wall of unfolded metal to provide thermal protection.

Description

-1 -

  The present invention is part of the field of thermal engineering. It is a dis-

  positive allowing both to melt levers of caps of aluminum beverage cans, and thus to mold the molten metal and / or to heat

test tubes.

  There was no heating element allowing both to melt aluminum

  nium or various metals and to heat test tubes combined into a single element

  ment .. Our device, represented by FIG. 1: device in the melting position and FIG. 2: device in the molding position, allows the process of reflow levers of lids of beverage cans, but also of other metallic waste. , characterized in that it is done in a standard test tube in

pyrex glass.

  This tube is fixed to the mold in a vertical position during the operation of

  fusion which is limited to a few minutes.

  The molding is done by inverting the TE test tube assembly (see Figure 2) and the M mold, using a handle P. This assembly is then placed in the

  support S until the test tube cools down.

  Heating for melting is carried out using a low voltage electric furnace F (typically 24V), of small size, of vertical axis, provided at its base with a plug B of refractory earth for the operation. of fusion, the support S and the furnace F being integral with a base S.

  In addition, the assembly of mold M, TE tube and handle P is maintained in posi-

  tion during melting on a support E. The plug B is removable, and allows when removed, to use the oven

  F for electric heating of test tubes or other experimental equipment

  chemical or physical mentation, using: - the current of hot air caused by natural convection in the oven, - the more intense heating zone offered by the center of the oven, including

  dimensions are provided for this purpose.

  The oven is small and has thermal protection provided by

  an outer wall made of expanded metal.

  The heating body of the device is a mullite tube on which is wound

  20 turns for a total resistance of 5.0 ohms.

-2-

  Around the heating body, there are insulating bricks of equivalent size.

  slow to half a brick RI 23 in half German format.

  The whole is surrounded by aluminum sheets of about 1.5mm. The other component parts of the device are made of aluminum, except for the handle P, of which

the tip is plastic.

  The device according to the invention is particularly intended for the heating of test tubes, or other chemical or physical material in establishments.

  school and by extension in laboratories.

  It is clearly claimed that one or the other of the two uses is equally

  Lement claimed, that the device is made to satisfy only one-

  ment of them, or alternatively to both.

-3-

Claims (6)

  1) Device intended either for melting metallic waste, in particular levers for lids of beverage cans, or for heating test tubes or other experimental equipment, characterized in that it consists of an electric oven low voltage F, typically 24 volts, small, with a vertical axis heating body fitted at its base with a removable plug B in refractory earth.   2) Device according to claim 1 used for the fusion characterized in that the fusion is carried out in a TE test tube in pyrex glass fixed on a   mold M in vertical position fitted with a handle P, the plug B being available   placed at the base of the oven and in that the melting is limited to a few minutes.   3) Device according to claim 2 characterized in that during the fusion the mold assembly M test tube TE is maintained in a vertical position at   by means of a support E placed on the upper part of the oven.   4) Device according to claim 2 characterized in that the molten material is molded by inversion of the test tube assembly TE mold M by means   of the handle P and in that the mold assembly M test tube after turning   is placed on a support S secured to the base of the oven until it cools of the test tube.   5) Device according to claim 1 used for heating test tubes or other experimental equipment characterized in that the test tube or   other experimental equipment is placed in the heating body, the plug   chon B being removed, the heating operation using: - the current of hot air caused by natural convection in the oven   - the more intense heating zone offered by the center of the oven, the dimensions of which for this purpose.   6) Device according to any one of claims 1 to 5 characterized in that   that the oven is provided with a thermal protection produced by a back wall expanded metal exterior.