DE1728533U - DEVICE FOR HARDENING FOUNDRY CORES BY INJECTION OF CARBONIC ACID. - Google Patents

Description

PA.37687M7.Si

DIp! -Irig., EgonPrfäTZ _MÜI10llea _ _{Graefelfing> den Jull}

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Itst'eion S9795

Machine and tool factory Kabel Vogel & Sehemmann AG
Hagen cable

Device for hardening foundry cores by blowing in

of carbonic acid

The invention relates to a device for hardening ^v; of foundry cores by blowing COp into the core box containing the finished core. It consists of a table carrying the core box, a CC ^ gas supplying mouthpiece to be pressed pneumatically from above onto the core box, and lateral, likewise pneumatically operated clamping jaws for clamping the core box.

Similar devices are already known. However, they have the defect that all operations have to be controlled by hand and that for this reason and because the carbonic acid only in one place is introduced into the core box, it takes too much time to harden a core.

According to the invention, this deficiency is now remedied in that the actuating piston of the from above on the

Core box

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Core box to press the main mouthpiece when it is applied the COg valve also opens with compressed air and that the COp gas, in addition to the main mouthpiece, also has the "is fed to both clamping jaws designed as additional mouthpieces.

In order to further automate the work of the machine, it is necessary to have the compressed air supply to the Actuating piston of the main mouthpiece and the clamping jaws regulating solenoid valve, which is activated by a push button or is opened by a switch that is closed when the core sleeve is inserted, a contactor Time switch is assigned to the necessary core solidification time can be set and after the same the closure of the solenoid valve and thereby at the same time the venting of the compressed air cylinder of the actuating piston causes.

An example embodiment of the subject matter of the invention is shown in the drawing in a schematic representation.

The device according to the invention consists of one the core liner 1 receiving table 2, one pneumatically from above onto the core liner 1 Mouthpiece 3 to be pressed open for the supply of COp gas and lateral clamping jaws ^ 4, 4 * for clamping the core * sleeve during the introduction of carbonic acid, of which at least the clamping jaw 4 is also pneumatically operated. Both the main mouthpiece 3 and the jaws 4 are

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interchangeable so that they can be adapted to the size and shape of the respective core box. The lateral clamping jaws 4j 4 * are designed as additional mouthpieces, so that with their help GO ₂ can also be fed into the core box from the side. The compressed air line 6, controlled by a solenoid valve 5, leads on the one hand into the cylinder 7 of the actuating piston 8 of the main mouthpiece 3 and, on the other hand, to the cylinder 9 of the actuating piston 10 of the lateral clamping jaw 4.

Both clamping jaws 4 and 4 * can with the help of the spindles 11 and 11 * carrying them opposite the core sleeve can be set. The spindle nut of the spindle 11 is formed by the piston 10, which has a return spring 12 is provided. In addition, the clamping jaws can with their drive means on the two on the table 2 stationary stands 13, 13 * can be adjusted in height.

The stands 13, 13 ¹ carry a yoke 14, in the cylindrical middle part 15 of which a likewise cylindrical shaft 16 is guided and can be adjusted up and down in the vertical direction by means of a spindle 17. The shaft; 16 carries a housing which, on the one hand, forms the already mentioned cylinder 7 of the actuating piston 8 and, on the other hand, a valve chamber 18 which is separated from the cylinder 7 by a stuffing box 19. The actuating piston 8 is with a through the piston

with

provided with the main mouthpiece 3 connected pipe 20 which passes through the gland 19 and into the Chamber 18 opens, which by means of a line 21 with is connected to a COp source. Is the piston 8 not under compressed air pressure, it is pressed by a return spring 22 into its uppermost position, in which the Opening of the tube 20 is pressed against a seal 23 and is closed with it, so that no COp-G-as from the chamber 18 key into tube 20 £ ann.

The hardening of a core proceeds as follows: compartment placing a core sleeve 1 containing a core to be hardened on the table 2, a rough adjustment of the main mouthpiece 3 and the clamping jaws 4,4 * is made by means of the handwheels of the spindles 17 or 11 and 11 *. The timer, not shown, is then set to the necessary core solidification time. Fun is actuated, the solenoid valve 5 via a push button, not shown, and also not shown contactor, wherein the valve body 5 ^r the compressed air entry into the pipe 6 releases, and the valve body closes ^5M this line against the outer atmosphere. The compressed air acts on the piston 8 and through the branch line 6 * and the piston 10. Thus, the main nozzle 3 from the top and the clamping jaw 4 is pushed from the side opposite the core box 1, wherein the other,

as

4 * clamping jaw serving as an abutment applies. The downward movement of the piston 8 also has the consequence that the upper end of the tube 20 τοη of the seal 23 comes free, so that carbonic acid can now enter the tube 20 from the line 21 via the chamber 18 and both to the main mouthpiece 5 and via branch lines the jaws 4 and A * forming the additional mouthpieces. The carbon dioxide can enter the core box from above as well as from both sides.

After the timer has responded, the solenoid valve 5 is de-energized, so that the valve body -5 * closes while the compressed air supply is shut off and the valve body 5 ^If opens so that the cylinders 7 and 9 are vented. As a result, the piston 8 moves upwards under the influence of the each 22, the upper opening of the tube 20 in turn being closed at the seal 23.

If a large number of cores are to be hardened with the same hardening time, it is advisable to arrange a switch which is parallel to the push button mentioned and which is actuated by the core sleeve itself when it is pushed into the working position on the table 2. In this way, machine operation is automated even further. ^v

Protection claims

Claims (4)

Protection claims .Device for hardening cast iron cores. Glazing of COp into the core liner containing the finished core, consisting of a table carrying the core liner, a CO ₂ gas supplying dog piece to be pneumatically pressed from above onto the core liner and lateral, likewise pneumatically actuated clamping jaws for clamping the core liner, characterized in that the actuating piston of the main mouthpiece, which is pressed from above onto the core sleeve, also opens the COp valve when it is pressurized with compressed air and that the COo-G-as is fed to the two side clamping jaws, which are designed as additional mouthpieces, in addition to the main mouthpiece. 2. Device according to claim 1, characterized in that that a solenoid valve regulating the compressed air supply to the actuating piston, which is controlled by a a push button or a contactor that is closed when the core sleeve is inserted is opened, a timer is assigned, which is set to the necessary core solidification time can be and after the same, the closure of the solenoid valve and thereby the ventilation at the same time the compressed air cylinder the actuating piston causes. ■ causes. 3. Apparatus according to claim 1 and 2, dadurGh characterized in that the actuating piston of the main mouthpiece is provided with a through the piston connected to the mouthpiece bore which opens through a gland into a chamber connected to the COp source and there under the Influence of a return spring of the actuating piston is pressed against a seal when the actuating piston is not under compressed air pressure. 4. Device according to one of the preceding claims, characterized in that the cylinder of the main mouthpiece actuating piston is adjustable in vertical direction, e.g. by means of a spindle.