DE1270230B - Process for the metered pouring of liquid metal melts from induction furnaces with a pouring pipe or pouring ladle by means of a displacement body which can be immersed into the melt at a continuous speed - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int Cl .:

B22d

German class: 31 b2 - 37/00

Number: 1270 230

File number: P 12 70 230.6-24

Filing date: March 10, 1966

Opening day: June 12, 1968

Casting ladles or induction furnaces are usually used for the metered pouring of molten material used with pouring tube. To od with the latter from the pouring tube in the form, mold. Casting a certain amount of molten liquid in the die casting machine is Height of the pouring tube filled with molten liquid crucible a corresponding to the liquid volume Amount of solid metal supplied. When the solid metal is introduced, it runs out of the pouring tube an amount of liquid corresponding to the solid metal from the pouring tube into the Die casting machine.

It is also known from a metering container which is closed with a lid and which has a riser pipe is provided, which is immersed in a reservoir filled with molten liquid, by means of Pressurized gas to remove melt liquid from the dosing tank. The dosage of the amount of melt takes place either through a displacement body, which is passed through the cover in a gas-tight manner by means of a Rod is inserted from the outside more or less far into the dosing container or by means of a radioactive radiation source with a receiver, both of which are shifted in their altitude will. With this method for metered pouring of liquid metal melts, however, it is necessary that after each pouring process, the dosing container must be refilled so that the next pouring process can only begin when there is molten metal from the storage container via the riser pipe has flowed into the dosing tank.

It is also known to use a displacement body for pouring off a pouring ladle filled with molten liquid to use. The displacement body moves down and up with the aid of a motor. This one is with a tachometer provided, the speed set on the tachometer when the displacement body is immersed is a measure of the poured amount of the molten liquid. The disadvantage of this method is not only the difficulty of the precise setting of a certain speed on the tachometer for a certain outflow Melt amount, but also that after each pouring process again a setting of the speed must be made. This then often leads to the fact that the dosed pouring quantities are among one another are not constant, but that different amounts of melt are poured off.

The invention relates to a method for the metered pouring of liquid metal melts

Process for metered pouring of liquids
Melting metal from induction furnaces with
Spout pipe or ladle by means of a with
continuous speed immersible sinker in the melt

Applicant:

AEG-Elotherm G. m. B. H.,

5630 Remscheid-Hasten, Hammesberger Str. 31

Named as inventor:

Dr.-Ing. Gerhard Seulen, 5630 Remscheid

from induction furnaces with pouring pipe or pouring

ao ladle by means of a displacement body that can be immersed in the melt at continuous speed, in which the above-mentioned disadvantages are avoided, and the invention consists in that at the moment of overflow the melt from the pouring tube by a preferably electrical pulse generator a time relay is actuated, which the immersion movement of the displacement body and thus the through the Displacement body causing melt flow ended after the time set on the time relay has elapsed. The use of a time relay, which works with great accuracy, ensures that that after each pouring process the same dosage of melt liquid from the die casting machine is fed.

An exemplary embodiment of the invention is explained in more detail in the drawing.

1 with a crucible is designated, which is provided with a pouring tube 2. A spring disposed around the crucible 1, and also advantageously to the discharge pipe 2 induction coil 3 is used for heating the molten liquid in the crucible 1 4. Above the bath surface of the melt 4 is a displacement body 5, which is attached to a lifting rod. 6 A cam 7, which opens a pressure contact a and thereby determines the initial position of the displacement body 5, is arranged on the lifting rod 6. The drive for the stroke movement of the displacement body 5 takes place by means of a three-phase motor 8 with spindle 13 and gear 9. The three-phase motor 8 is via the switching contacts v ₂ for forward running and via

809 559/399

the switching contacts V _{1 are connected} to the mains phases R, S, T for reverse operation. Immediately below the overflow point of the pouring tube 2 is a photoelectric pulse generator 10 which, as soon as the melt 4 has exceeded the overflow point, interrupts a light barrier 11 and closes the associated light barrier contact e , whereby a time relay Z is actuated to expire the time set on the time relay.

The mode of operation of the invention is as follows: After pressing the manual pushbutton switch 12, the flow relay V for the forward motor run receives voltage via the normally closed contact Z ₂ and closes the self-holding _{contact V 1} . At the same time, the switching contact v _{2 is} closed, whereby the motor receives voltage from the mains phases R, S, T and moves the displacement body 5 down from the initial position. During the downward movement of the displacement body 5, the cam 7 disengages from the pressure limit switch, so that the contact a is closed. After a certain time of the downward movement, the displacement body 5 dips into the melt 4, the melt pool level being raised until the melt liquid emerges at the overflow point of the pouring tube 2. At this moment, the light barrier 11 of the pulse generator 10 is interrupted, so that the associated light barrier contacts of the pulse generator 10 is closed and the timing relay Z receives voltage, the instantaneous contact Z ₁ closes, whereby the expiry of the time set on the timing relay Z begins. During the lapse of time of the relay Z, the displacement body 5 dips further into the melt 4, so that the amount corresponding to the volume of the immersed displacement body flows out of the pouring tube as the pouring amount. After the time set at the time relay Z has elapsed, the normally closed contact Z ₂ opens, so that the flow relay V is de-energized. The self-holding _{contact V 1} and the switching contact V ₂ are opened so that the motor 8 stops and the displacement body 5 stops in the melt 4. Thereafter, _{the normally open contact Z 3 is} closed, whereupon the return relay R for the reverse running of the motor 8 receives voltage for the reverse movement by phase rotation and the displacement body 5 moves back from the melt 4 to the initial position. The initial position of the displacement body 5 is determined by the cam 7 which, when the initial position approaches, opens the closed pressure contact α of the pressure limit switch and thus de-energizes the relay coils of the timing relay Z and the return relay R. The contacts Z ₁ and Z ₃ and the switching contact T _{1 are} opened and the normally _{closed contact Z 2 is} closed. In this state, the switchgear is in its initial position and a new switching process can then be carried out by pressing in the pressure switch.

Claims (2)

Patent claims: 1. Method for the metered pouring of liquid metal melts from induction furnaces with a pouring tube or ladles by means of a continuous speed into the melt immersible displacement body, characterized in that at the moment of Overflow of the melt from the pouring tube by a preferably photoelectric pulse generator a time relay is actuated, which the immersion movement of the displacement body and thus the melt flow caused by the displacement body after the expiry of the am Time relay set time ended. 2. Circuit arrangement for carrying out the method according to claim 1, characterized in that the flow relay (F) is excited by actuation of the pressure switch (12), the motor (8) lowers the displacement body (5) in the melting chamber and that when the Melt from the pouring tube the light barrier (11) of a photoelectric pulse generator (10) is interrupted so that the pulse generator triggers a pulse that actuates a time relay (Z), which _{opens the normally closed contact (z 2} ) after the set time has elapsed, whereby the flow relay (F) is de-energized and by opening the contacts (v ₂ ) the motor (8) and the displacer (5) in the melt stop and by closing the contact (z ₃ ) the return relay (R) receives voltage, whereby the contacts (^) are closed and the motor moves the displacement body back to its starting position. Considered publications:
German Auslegeschrift No. 1197 591;
"La Metallurgie", 1955, p. 781. 1 sheet of drawings 809 559/399 5.68 © Bundesdruckerei Berlin