FR2573856A1 - INDUCTION OVEN WITH VERTICAL CHANNELS - Google Patents

Abstract

THE SUBJECT OF THE PRESENT INVENTION IS AN INDUCTION OVEN WITH VERTICAL CHANNELS. ACCORDING TO THE INVENTION, THIS OVEN INCLUDES A SERIES OF CRUSHING PINS 6 WHICH ARE EACH PLACED IN THE AXIS OF A CHANNEL 2 AND WHICH ARE MOBILE MOBILE VERTICALLY RELATIVE TO THE OVEN SO AS TO BE MOVED IN THE CHANNELS OR EXTRACTED FROM THESE, A MOTOR 9 OR 23 TO MOVE THE SET OF PIN 6, AND TIMED AUTOMATIC MEANS TO CONTROL THE MOTOR SO AS TO PRINT ON THE SPINDLES A VERTICAL ALTERNATIVE MOVEMENT AT GIVEN TIME INTERVALS.

Description

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  The present invention relates to electric induction furnaces, with vertical channels, used to ensure the fusion

  and the temperature maintenance of an alloy, for example a

aluminum binding.

  In these furnaces, the melting of the metal or alloy takes place

  inside the vertical channels, causing fouling

  quickly and requires them to be regularly cleaned up

  larly. The scrubbing of the vertical channels is carried out with the aid of the scrubbing pins which are until now maneuvered

  by hand. The operator communicates to the spindle a reciprocal movement

  vertical tiline reciprocating by striking with a mass on the spindle rod if the effort required by the descent is too important. To raise the spindle, the operator strikes with the mass under the handle of the spindle or uses a hoist and a sling. This work is all the more painful

  is performed above the molten metal bath.

  The subject of the present invention is a furnace and induction with vertical channels which is improved so as to remedy

this disadvantage.

  The oven according to the invention is characterized in that

  carries a series of slaughtering pins that are arranged

  each in the axis of a channel and which are mounted vertically

  tically in relation to the oven so that it can be moved

  in or out of the channels, an engine for moving

  all the pins, and the automatic means

  to control the motor so as to print the spindles with vertical reciprocating motion at given time intervals. The automatic delayed motor control means may comprise a timed control clock emitting a periodic signal capable of controlling the motor in the direction corresponding to the descent of the pins, a contactor detecting the low position of the pins, and a timer responsive to the signal of the contactor and clean to control the motor in the

  meaning corresponding to the rise of the pins.

  The oven advantageously comprises means for not allowing

  only when the pins are in the up position.

  The heating is thus stopped during the scrubbing maneuver

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  which avoids the mixing of the metal which would lead to erosion

some pins.

  The engine may be constituted by a double-acting cylinder,

  preferably pneumatic, whose rod is integral with the

  seems pins. It can also be constituted by a

  electric motor whose output shaft is connected by means of

  of a torque limiter to a pinion engaged with a

  rack integral with all the pins.

  The pins can be mounted on a cross member which is integral with the rod of the jack or the rack and which is

  mobile with respect to a gantry supporting the engine and

above the oven.

  We have described below, by way of non-limiting examples,

  two embodiments of the oven according to the invention, with reference

  FIG. 1 shows an oven in which the pins are moved by a jack; Figure 2 shows an oven in which the pins are

  moved by an electric motor.

  Figure 1 shows an electric melting furnace

  duction 1 with vertical channels 2 inside the

  what is the fusion of the metal. These channels are associated with coils 3 connected by conductors 4 to a cabinet

electrical control 5.

  In the axis of each channel 2 is a spindle

  wise 6, the set of pins being attached to a crossbar 7.

  It is secured to the piston rod 8 of a pneumatic cylinder

  9, double-acting, which is arranged vertically and

  by a portico 10 resting on the oven 1. This portico door

  at its lower part a guide 11 for the cleaning pins

wise 6.

  The cylinder 9 is supplied with compressed air by a distributor

  This distributor is controlled in the direction of descent of the pins by a timed control clock 13 and, in the opposite direction, by a timed control device 14 which

  is under the control of a contactor 15. The latter is action-

  born by the crossbar 7 in the low position. An alarm 16 is connected by a timer 17 to the devices 13 and 14 so that

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  to go into action a given time after an order has been

  given to these devices, if these did not work.

  A contactor 18 actuated by the cross member 7 so as to be closed only when this cross member is in the up position, is interposed on the feed circuit 4 of the boosters.

3.

  At given time intervals, the timed clock 13

  sends a signal that moves the drawer of the dis-

  tributor 12 and brings it to its position corresponding to the

  descent of the pins. As soon as this movement begins, contact

  18 opens, which cuts off the power supply of the coils 3 and

ensures the heating stops.

  Pins 6 go down, penetrate the metal bath

  in fusion, then in the channels 2 which they clean up.

  When the pins arrived in the low position, the

  verse 7 activates the contactor 15. After a lapse of time

  given, the timer 14 ensures the return of the drawer of the dis-

  tributor 12 in its initial position so that the pins go back up. When they are in the high position again,

  the crosspiece 7 actuates the switch 18 so that the bobbin

  3 are energized and heating resumes.

  In the embodiment of FIG. 2, the crossbar 7 is integral with a vertical rack 19 in engagement with a pinion 20 which is wedged on a shaft 21. This is connected by

  a torque limiter 22 at the output shaft of an electric motor

23 with two directions of rotation.

  The power supply of the motor 23 is connected to the network 24 by a switch-reverser 25 which is controlled by the devices

  13 and 14 and by a microswitch 26 itself

by the torque limiter 22.

  This embodiment functions as that of FIG.

  1. At regular intervals, the clock 13 turns the clock

  23 in the direction corresponding to the descent of the pins 6.

  When the pins are in their low position, the microswitch 26 stops the motor 23. Then the timer 14 makes

  turn this motor in the opposite direction; the pins go back up.

  When they have resumed their high position, the engine 23 is

  stopped by the micro-contact 26 and the switch 18 ac-

  -Inne through the crossbar 7 reuet the heating in use.

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Claims (6)

claims   1. Vertical channel induction furnace   characterized in that it comprises a series of spindles of   6) which are each arranged in the axis of a channel (2) and which are movably mounted vertically relative to the furnace so as to be displaceable in the channels or ex-   of these, an engine (9 or 23) to move the assembly   pins (6), and timed automatic means for   control the motor so that the spindles   vertical alternative at given time intervals.   2. Oven according to claim 1, characterized in that the automatic timed means of   motor control include a time control clock   risie (13) emitting a periodic signal adapted to control the motor (9 or 23) in the direction corresponding to the descent of the pins (6), a contactor (15) detecting the low position of the pins, and a timer (14) sensitive to the signal of the contactor (15) and able to control the motor (9 or 23) in   the meaning corresponding to the ascent of the pins.   Oven according to claim 1 or 2,   characterized in that it comprises means (18) for preventing   only when the pins (6) are in position high level.   4. Oven according to one of the preceding claims,   characterized in that the motor is constituted by a double-acting cylinder (9), preferably pneumatic, whose rod (8)   is integral with all the pins (6).   Oven according to one of Claims 1 to 3,   characterized in that the engine is constituted by an engine   (23) whose output shaft is connected via the   torque limiter (22) to a gear (20) in engagement with   with a rack (19) integral with all the pins (6).   Oven according to claim 4 or 5,   characterized in that the pins (6) are mounted on a tread   pour (7) which is integral with the rod of the jack (9) or the rack (19) and which is movable relative to a gantry (10)   supporting the motor and arranged above the oven.