DE1090385B - Equipment for operating core shooters - Google Patents

Description

It is known to produce casting cores by so-called shooting. Trained for this purpose Core shooters have a table that can be raised and lowered, on which the core box is placed and attached the firing head is pressed, through which the molding material is pressed into the core box under excess pressure will. Such core shooters are very powerful and allow to a large extent the saving of manual labor, but the operation of these core shooters is considerable Trouble. The shooting process itself only takes a few seconds, and by comparison, those are The times that are required for the other manipulations on the core are excessively large, so that the The advantages of such a core shooter cannot be fully exploited. In particular in proceedings in which an aftertreatment process, for example carbonic acid hardening, is applied to the formation of the core of the core material is connected, these disadvantages are particularly evident Validity. With the usual core shooters, the carbonic acid hardening takes place on the machine itself, so that this machine is blocked for the time required for curing. Further requires opening the core mold and removing the finished core several times that Time required for the shooting process itself. Such core shooters, which in themselves are expensive, are therefore completely underused, and it is with the known arrangements A relatively large amount of manual labor is associated with operating the core shooter, moreover, in particular in the common heavy core forms, is exhausting. To a more economical one To enable work with core shooters, one therefore has, for example, a device for Operation of core shooters developed with five rotatable around a vertical pivot axis Swivel arms have brackets carrying the core box parts, with a station des Turntable arranged the sand shooting machine and assigned special devices to another station are provided for the automatic stripping of the finished cores. A possibility for follow-up treatment of the cores, e.g. B. for carbonic acid hardening, this known device does not provide, and it She also still had difficulties emptying the core box.

The invention relates to a device for operating such core shooters which work with multi-part core boxes, in particular for casting cores which are to be subjected to an after-treatment, such as carbonic acid hardening, with at least one operating device for feeding the core box
of core shooters

Applicant:
Tyrolean pipe and metal works

Aktiengesellschaft,
Solbad Hall (Austria)

Representative: Dipl.-Ing. H, linen weaver, patent attorney,
Munich 2, Rosental 7

Claimed priority:
Austria from March 22, 1956

Dipl.-Ing. Kurt Bauer, Innsbruck,

and Ernst Urbanke, Solbad Hall (Austria),

have been named as inventors

a vertical axis pivotable and height-adjustable pivot arm is provided, and aims at it above all to improve the automatic stripping of the cores. The invention is essentially thereby characterized in that each of the two parts of the core box divided by a vertical parting line is fixed for itself on a bracket arranged on the swivel arm and that the core box parts supporting brackets are movable against each other for the purpose of closing and opening the core box are, wherein the swivel arm is mounted freely adjustable in height.

In this way, an operating device for core shooters is created which, while largely avoiding manual labor, feeds the core boxes to the core shooter in an assembled state so that they can be brought directly from the core shooter to the shooting head. In the manufacture of casting molds, it is known to use pivot arms which place the individual molding boxes on conveyor belts or feed them to the molding machine, these pivot arms attacking the journal and merely serving as a hoist. However, because, according to the present invention, the core box parts of a multi-part core box are arranged on mutually movable brackets of the swivel arm, the device according to the invention simultaneously effects the Zn-

009 610/107

Assembling the core box and transporting it to the shooting head of the core shooting machine. The height-adjustable mounting of the swivel arm enables the core box to freely participate in the height movements of the table of the core shooter _; without the need to remove the core box from the swivel arm. After the shooting process has taken place, the core box with the core can then be removed again immediately from the core shooting machine.

According to the invention, a core box part can therefore be attached to each of the brackets of the swivel arm be rigidly attached so that the cores are shot in series using the same core box can be. The brackets can, for example, fastening slots for clamping various Have core box parts. According to the invention, these brackets are useful as Preferably pneumatically operated holding jaws that can be opened like pliers. A pneumatic one or hydraulic actuator for the opening and closing movement can be by flexible Hoses are controlled, and this is in view of the fact that the brackets or Holding jaws are movably mounted on the swivel arm in space, an advantage over a mechanical one Actuating device.

According to the invention, at least one is now in the area of the swivel arm or the swivel arms Height-adjustable table for releasing the shot core from the core box or for post-treatment of the core. An appropriately height-adjustable carbonic acid nozzle is preferably also provided, by means of which the carbonic acid hardening only outside the core shooter, namely on the Side table, can be done.

In a practical embodiment of the control device according to the invention is a stationary one vertical column is provided on which a tubular part is freely rotatable and adjustable in height is, which od in its lowest position by a stationary thrust bearing. The like. Is supported, one on the tubular part to be clamped sleeve carries the swivel arm. On this stationary vertical The column can now also be mounted so that the carbonic acid nozzle can be moved vertically in an expedient manner.

The drive for the lifting and lowering movement of the swivel arm or the core box can now from The machine table of the core shooter can be derived, while the swivel arm is freely adjustable in height is stored. In order to relieve the swivel arm or a tilting of the height-adjustable swivel bearing under the action of the projecting end of the swivel arm carrying the core box To avoid attacking lifting force, the part of the swivel bearing carrying the swivel arm expediently has for example the sleeve, a stop which rests on the table of the core shooter and the lifting movement of the same transmits to the swivel arm.

In order to facilitate the release of the core from the core box when it is opened, the height-adjustable carbonic acid nozzle are formed with a holding member gripping the core, so that this carbonic acid nozzle is also used to fix the core during the release of the core from the Eorm can be. A corresponding holding element for the core can be provided on the storage table, and it can further a uniform opening of the holders and thus the core box parts of the in the core held in such a way can be forced away by a corresponding handlebar arrangement, In addition, the release of the core from the core box is facilitated by vibrators. That Detaching the core from the core box can thus be carried out fully automatically, and in particular with slim cores which do not have the corresponding stability after being removed from the core box have, the fixation of the same by means of the carbonic acid nozzle offers an essential Advantage.

If a core shooter has a single such operating device with a swivel arm, a storage table and, if necessary, a carbonic acid nozzle is assigned, this enables operating personnel on the one hand save and on the other hand to accelerate the operating process, so that the core shooter more economical can be exploited. But if several such operating devices of a core shooter be assigned, as corresponds to a preferred embodiment of the invention, so is that those processes which are not directly related to the shooting of the nucleus stand outside the core shooter can be made, the core shooter immediately after the completion of the shooting process again for the treatment of the next one Core free, and in this way the capacity of the core shooting machine is used several times. In particular This has an impact when the core is subjected to after-treatment after shooting, for example should be subjected to carbonic acid hardening, since then the core shooter will not is burdened by such time-consuming post-treatment. The invention therefore offers just for the Production of such shooting cores, which are subjected to an aftertreatment, such as carbonic acid hardening will be the greatest benefits. For example, it can count the number of people using a core shooter cooperating swivel arms approximately in accordance with the ratios between the time period the post-treatment and, if necessary, the detachment of the shot cores from the core box on the one hand and the duration of the core shooting and, if necessary, the core insertion (if the core insertion made by the same man) on the other hand. It turned out to be in practice shown that up to four such operating devices are assigned to a core shooter to fully utilize the capacity of a core shooter. In such a case, the control device according to the invention allows in the time it takes for the completion of a Core is required to make four cores on the same core shooter. Since the operating device according to the invention, the production time of this one core is also reduced, In such a case, the capacity of the core shooter is increased to more than four times.

In the drawings, the invention is explained on the basis of schematic exemplary embodiments.

Fig. 1 shows a side view of the operating device and the core shooter, while

Fig. 2 is a plan view in section along line II-II Fig. 1 represents;

3 and 4 show in elevation and plan a modified form of the holder of the core box and the carbonic acid nozzle, the carbonic acid nozzle in the plan according to FIG. 4 for clarity is half away;

5 and 6, 7 and 8 and 9 and 10 show the various working positions in elevation and plan a device according to FIGS. 3 and 4.

1 represents the core shooter with the lifting and lowerable machine table 2. During normal operation of such a core shooter, the core box placed on the machine table 2, held together by clamping jaws 3 and lifting the Table 2 pressed against the shooting head 4.

In addition to the core shooter 1, a column 5 is now fixedly arranged, which by a cross member 6 with connected to the top of the core shooter. On this stationary column 5 is a tubular Part 7 rotatably and vertically displaceably mounted and supported against a thrust bearing 8. On this tubular Part 7 is again a sleeve 9 with the mediation of tensioners 10 at the appropriate height clamped. This sleeve 9 carries a pivot arm composed of two parts 11 and 12 in an articulated manner, the parts 11 and 12 of which are connected to one another in a torsionally rigid manner by a joint 13. To the Part 12 of the swivel arm is a pair of pliers 14, 15 articulated by means of a torsion-resistant joint 16, on the jaws 17, 18 of which the parts 19, 20 of a two-part core box are attached. To core box To be able to clamp different sizes on these jaws 17, 18, these jaws have clamping slots on. By means of a compressed air cylinder 21, the two pliers parts 14, 15 with the jaws 17, 18 and the core parts 19, 20 are closed and opened. 22 shows a storage table which is height adjustable can be formed.

The swivel arm 11, 12 now makes it possible to move the core box from the support table 22 onto the table 2 to bring the core shooter and from this back to the parking table 22, the height-adjustable Shelf table 22 allows the use of core boxes of different heights.

The sleeve 9 is mediated by the clamping toggle 10 at the appropriate height on the tubular Part 7 clamped, the height corresponding to the height of the storage table 22 by a Stop 23 can be determined. The form can now be assembled on the storage table 22 and swiveled to table 2 of the core shooter by a simple swivel movement. The articulated design of the swivel arm 11, 12 enables the way of the core box in this way choose that it does not collide with any part of the core shooter and at the correct one Place on the table of the core shooter. In this pivoting movement is the tubular part 7 supported against thrust bearing 8. With the mediation of table 2 of the core shooter the core box 19, 20 is now lifted and pressed against the head 4 of the core shooting machine. The height-adjustable mounting of the tubular part 7 enables the core box to be lifted freely 19, 20 with the pivot arm 11, 12 and the sleeve 9 with the tubular part 7. To this one To avoid corners, the stop 23 is arranged on the sleeve 9 so that it is in the core shooter 1 pivoted position 23 'is taken from the machine table 2. The lifting of the sleeve 9 with the tubular part 7 is therefore carried out with the intermediation of the stop 23. As soon as it is now raised in this When the shooting process is finished, the machine table is lowered again and the core box 19, 20 is pivoted to the support table 22 and placed on this. The further work process can now go on this storage table 22, and it can, for example, with the mediation of an on the upper end of the core box 19, 20 attachable head 24 the carbonic acid hardening take place. Even a solidification of the core material can still take place on this support table, for which purpose, for example A vibrator can be arranged on the tong arms 14 or 15.

After lifting the carbonic acid nozzle 24 with the aid of a compressed air cylinder 21 the Holding jaws 17, 18 opened, with the holding jaws 17, 18 attached to facilitate opening Vibrators have to be activated beforehand. After removing the core and cleaning or When the mold is blown out, the device is ready for the next operation.

In order to fully utilize the performance of the core shooter, additional ones, for example a total of four similar operating devices, provided, with additional columns 5 on the positions 5 ', 5 "and 5"' are arranged.

In the embodiment according to FIGS. 3 and 4, the tong arms 25 and 26, which are the holding jaws 27, 28, to which the two core box halves 19, 20 are attached, with the mediation of them Articulation axis 29 mounted on swivel arm 30. By one at an angled extension 31 of the swivel arm 30 mounted double-armed lever 32, the ends of which via links 33 with hinge points 34, 35 of the Tong arms 25, 26 are connected, is a uniform opening movement of the two core box halves 19 and 20 forced when releasing the core 36 from the core box. On the two tong arms

25 and 26 vibrators 37 are arranged, which are switched on when the core box is opened and facilitate the detachment of the core box halves 19 and 20 from the core 36. 38 represents the tong arms 25, 26 are actuating pneumatic cylinders, which are articulated at the hinge point 35 on the tong arm 26 and whose piston rod 39 is articulated at the hinge point 34 of the tong arm 25. By prestressed Springs 40 are the two tong arms 25,

26 when the pressure is relieved in the pneumatic cylinder 38 pushed apart a little, so that the first part of the opening movement of the core box halves 19 and 20 under the action of these springs

40 takes place.

The carbonic acid nozzle 41 is mounted on a pivot arm 42 adjustable in height and is by a pneumatic cylinder 43 adjusted. The cylinder 43 is articulated on a carrier 44 which is attached to the Column 5 is attached while the piston rod 45 engages the lever 42. On a second arm 46 of the the arm 42 carrying the carbonic acid nozzle 41 and pivotable about a hinge axis 47 acts through a pretensioned spring loaded plunger 48 which, when the cylinder 43 is relieved of pressure, the carbonic acid nozzle

41 stands out from the core box 19, 20 by a small amount.

The carbonic acid nozzle has a mandrel 49, which still engages in the material of the core 36, when the carbonic acid nozzle 41 is already slightly lifted, and in this way the core 36 when opening the Core box halves 19, 20 fixed. This mandrel is after an arc of a circle whose center is in the joint axis 47 lies, curved. A mandrel 50, indicated by dashed lines, can also be provided on the storage table 22 be, through which the core is secured against displacement, so that through the mandrels 49 and 50 the core 36, even if it does not

has speed, when opening the core box halves 19 and 20 is held.

In the following, the mode of operation of the in Fig. 3 and 4 illustrated device explained.

After the core has been manufactured on the core shooter, the core box is placed on the storage table 22 and the carbonic acid nozzle 41 is placed on the core box 19, 20. This position is shown in Figs. The control valve 51 assigned to the pneumatic cylinder 38, which the opening and closing movement of the pliers 25, 26 causes, has a pressure chamber 52, which is connected to the compressed air inlet 53, and two connected to the exhaust 54 spaces 55 and 56. The coil 58 is energized via a switch 57, and the valve disk 59 provides the connection from the cylinder space 60 to the left side of the piston 61 with the pressure line 53. Of the Switch 62 is open. The coil 63 is therefore de-energized, and the valve disk 64 is the connection of the right side 65 of the pneumatic cylinder 38 with the exhaust 54 free. The pliers 25, 26 are therefore closed held.

The control valve 66 controlling the pneumatic cylinder 43 likewise has a pressure chamber again 67, which is connected to the compressed air connection 68, and two pressure-relieved spaces 69 and 70 connected to the exhaust 71. In the position shown in Fig. 5 and 6 is the Switch 72 closed and coil 75 energized. The space 73 above the 'piston 74 is in this position of the valve plate 76 is connected to the compressed air supply 68, the switch 77 is open, and the coil 78 is therefore de-energized. The valve disk 79 therefore also provides the space 80 under the piston 74 the exhaust 71 free. The piston rod 45 therefore presses the carbonic acid nozzle 41 onto the core box 19., 20. Here, the arm 46 presses on a spring-loaded plunger 81, which the valve 82, which the Controls carbonic acid supply to nozzle 41, opens. As long as the carbonic acid nozzle is on the core box 19, 20 is pressed on, carbonic acid is therefore supplied through the flexible hose 83.

As soon as the carbonic acid hardening of the core 36 is finished, which depends on the size of the core 3 to Takes 30 seconds, the switches 57, 62, 72 and 74 are in the position shown in FIGS. 7 and 8 switched, whereby now all switches are opened. In the case of the piston actuating the tong arms 25, 26 38, the spaces 60 and 65 are connected to the exhaust 54 by the valve disks 59 and 64, and therefore pressureless. The springs 40 supported against the extension 31 of the pivot arm 30 are now the Pliers arms 25, 26 pressed apart so that the core box halves 19, 20 by a few millimeters to open. The opening stroke caused by the spring 40 is limited because these springs are preloaded and execute only a limited stroke, which is just enough to move the core box halves 19 and 20 to open a few millimeters. At the same time, a switch 84 opens a compressed air valve 85, which actuates the pistons of vibrators 86 momentarily. On each of the two tong arms 25, 26 Such a vibrator 86 is arranged and facilitates the loosening of the core box halves through the vibration 19, 20 from core 36.

Also the rooms 73 and 80 on both sides of the Pistons 74 in cylinder 43 have become depressurized by opening switches 72 and 77. By a pretensioned spring, which acts on the second arm 46 of the pivot arm 42 via the plunger 48 now the carbonic acid nozzle 41 is raised by a few millimeters, so that the opening movement of the core box halves 19, 20 is not disturbed. At the same time, the arm 46 releases the plunger 81 and the valve 82 closes the supply of carbonic acid to the nozzle 41. To now the core 36 during the opening movement of the To hold core box halves 19 and 20, the carbonic acid nozzle 41 is only raised so far that the Mandrel 49 still engages in core 36.

The position shown in FIGS. 9 and 10 is then switched to. The switch 57 remains open while switch 62 is closed. The space 60 to the left of the piston 61 in the cylinder 38 remains connected to the exhaust 54 and relieved of pressure, while the space 65 to the right of the piston is connected to the compressed air supply 53 and pressurized. The piston 61 is therefore pressed to the left, and the core box halves 19, 20 open completely, with the pretensioned Lift the springs 40 off the stops on the tong arms 25 and 26. The vibrator 86 is in FIG. 10 not shown because it is no longer required for the function.

If now the core 36 has such a compact shape that it can be without support by the If the pin 49 of the carbonic acid nozzle 41 remains standing on the storage table 22, the switch 77 is also activated at the same time closed while switch 72 remains open. The cylinder chamber 73 is now above the piston 74 of the cylinder 43 is connected to the exhaust 54, and the space 80 below the piston 74 is connected to the compressed air inlet 68 connected. The arm 42 with the carbonic acid nozzle 41 is thus raised, and the core 36 is completely released and can now be lifted off the support table 22 by hand.

If the core 36 is designed in such a way that its stability is insufficient, the switch 77 remains so long open until the core 36 is grasped by hand, and it is then closed by closing the switch 77 the carbonic acid nozzle 41 with the mandrel 49 is lifted off.

The purpose of springs 40 and 48 can also be seen from this illustration. Through the prestressed With the piston 61 relieved on both sides, springs 40 cause a slight opening movement of the two Core box halves 19, 20 achieved. When this slight opening movement is carried out pneumatically would be a very complicated control or possibly even a second, additional one Cylinder required. The same also applies to the resilient plunger 48, which is depressurized on both sides Piston 74 causes the lifting movement of the carbonic acid nozzle 41 by a few millimeters.

Claims (17)

Patent claims: 1. Device for operating core shooters with a multi-part core box, in particular for the production of foundry cores, which are subject to post-treatment, such as carbonic acid hardening, are to be subjected to, with at least one around a vertical for the feeding of the core box Axis pivotable and height-adjustable pivot arm is provided, characterized in that that each of the two parts (19, 20) of the core box divided by a vertical parting line for itself is fixed to a respective bracket (14, 15, 17, 18) arranged on the swivel arm (11, 12, 13) and that the holding parts supporting the core box parts rests against each other for the purpose of closing and opening the core box (19, 20) by means of Compressed air cylinders (21) are movable, the swivel arm being mounted so as to be adjustable in height. 2. Device according to claim 1, characterized in that the on the pivot arm (11, 12) arranged brackets made of pliers-like opening, preferably pneumatically operated Holding jaws (14, 15, 17, 18) exist. 3. Device according to claim 1 or 2, characterized in that the brackets (14, 15) or Holding jaws (17, 18) fastening slots for clamping core box parts (19, 20) of various types Size. 4. Device according to claim 1 to 3, characterized in that in the region of the swivel arm (11, 12) or the swivel arms have at least one height-adjustable storage table (22) for releasing of the shot core from the core box or for post-treatment of the core is arranged. 5. Device according to claim 1 to 4, characterized in that the brackets (14, 15, 17, 18) are equipped with vibrators. 6. Device according to claim 1 to 5, characterized by at least one stationary vertical Column (5) on which a tubular part (7) is mounted in a freely rotatable and vertically displaceable manner is, which is supported in its lowest position by a stationary thrust bearing (8) or the like, and by a sleeve (9) which can be clamped to the tubular part (7) and which supports the swivel arm (11, 12) carries. 7. Device according to claim 1 to 6, characterized in that in the region of the swivel arm (11, 12), on the fixed column (5), a height-adjustable carbonic acid nozzle (41) with on the Core box (19, 20) or sealing surfaces attachable to the core is arranged. 8. Device according to claim 1 to 6, characterized in that the pivot arm (11, 12) is free Is mounted so that it can be adjusted in height and the machine table (2) of the core shooter drives the Forms lifting and lowering movement. 9. Device according to claim 8, characterized in that the swivel arm (11, 12) the supporting part of the pivot bearing, for example the sleeve (9), has a stop (23) which rests on the table (2) of the core shooter (1) and the lifting movement of the same the swivel arm (11, 12) transfers. 10. Device according to claim 1 to 6, characterized in that the pivot bearing of the Swivel arm (11,12) is assigned a drive for the height adjustment. 11. Device according to claim 1 to 10, characterized in that the number of with a core shooting machine (1) interacting swivel arms (11, 12) and storage tables (22) approximately the ratio between the duration of the post-treatment and the release from the mold on the one hand and the duration of the core shooting and, if applicable, the core insertion on the other hand. 12. Device according to claim 1 to 11, characterized by one on the brackets (14, 15, 17, 18) and on the swivel arm (11, 12) engaging link arrangement (32, 33), which are the same Forced opening paths of the brackets (14, 15, 17, 18) relative to the swivel arm (11, 12). 13. Device according to claim 1 to 12, characterized in that the height-adjustable Carbonic acid nozzle (41) with a holding member that grips the core (36), in particular with at least one a mandrel (49) penetrating into the core (36) is formed. 14. Device according to claim 13, characterized in that the carbonic acid nozzle (41) for The purpose of height adjustability is pivotably mounted and penetrating into the core (36) The mandrel (49) is curved according to an arc of a circle, the radius of which corresponds to the pivot radius. 15. Device according to claim 1 to 14, characterized in that the storage table (22) on the point at which the core (36) with the core box (19, 20) is placed has thorn-shaped holding member (50) for the core (36), which during the opening movement of the Core box parts secure the core against lateral displacement. 16. Device according to claim 1 to 15, characterized in that the core box parts (19, 20) with their pneumatically or hydraulically operated brackets (25, 26) by a suspension (40) are pushed apart, which are compressed during the last part of the closing stroke will. 17. Device according to claim 1 to 16, characterized in that the pneumatic or hydraulically height-adjustable carbonic acid nozzle (41) by means of a spring-mounted plunger (48) is held at a distance from the core (36) or core box (19, 20), the force of which is less than that during the last part of the placement stroke of the carbonic acid nozzle when it is pressed against the core (36) or core box (19, 20) occurring counterpressure. Considered publications:
British Patent No. 744,656;
Swiss Patent No. 308 042;
"Foundry Practice", 1955, No. 2, pp. 29 to 32; No. 3, pp. 49 to 51 and Fig. 7. 1 sheet of drawings ® 009 610/107 9.60