DE2004429C - Method and device for compacting plastic molding compounds by centrifugation. Ajim: Martin & Pagenstecher GmbH, 5000 Cologne - Google Patents

Description

15 Apparatus according to claim 6, characterized in that the peripheral surface of the Centrifugal head housing in the area of the transport path of the molding compound through the centrifugal vane of several wear plates (69, 69 ', 69 ").

16. The apparatus according to claim 15, characterized in that the first and last of the joined Wear plates (69, 69 ") each with one-piece, outwardly protruding lugs (70, 72) are provided, wherein the nose (70) of the lower wear plate is on a projection (71) is supported on the centrifugal head housing and the nose (72) on de. upper wear plate is detected by a lug (73) provided clamping screw (74) which through the Wall of the centrifugal head housing is led to the outside and is tense there.

17. The device according to claim 6, characterized in that the centrifugal head housing in Direction of rotation of the centrifugal wheel seen in a close area in front of the feed hopper a vent opening (75) is provided.

18. Apparatus according to claim 6, characterized in that in the direction of rotation of the centrifugal wheel seen in an area shortly before the pendulum flap (41) a moisture supply line (76) opens into the centrifugal head housing.

The invention relates to a method and an apparatus for compressing plastic molding compounds by centrifuging, especially for lining of ladles, converters, torpedo pans and similar containers to form a refractory Wall, whereby the molding compound jet exiting aius a centrifugal molding machine without a reversal of direction is guided in closed contours. In sand centrifugal molding machines, it is known to adjust the sandblasting direction by rotating the To change the centrifugal wheel housing. To change the direction of the blower wheel head without To achieve its rotation, it has already been proposed that arranged on the inner circumference of the non-rotatable Centrifugal wheel housing a chuck provided with an exchangeable sand baffle is guided>

that for the purpose of changing the sandblasting direction within certain, through recesses of the Sch5euderradgehäuses fixed limits is rotatable and lockable.

To produce the lining of casting ladles or the like by means of a ramming mass jet, it is known that one after the other inner formwork rings are introduced into the ladle, their respective Height one TeU corresponds to the height of the pouring ladle wall and the ramming mass flow in several Operations thrown in approximately from the middle of the free upper edge of the respective uppermost ring If the surface line is not straight or if the thickness changes, Um will de? Lining over the height the ladle wall an adaptation to the span between the inner wall of the ladle and interior formwork has also been suggested by slowly shuttling the whole Centrifugal head the. Ramming mass jet temporarily against the inner wall of the ladle, temporarily ao wise against the inner formwork and in between paral representation of the

_the

3 shows a diagrammatic view
ScmeuderfonnmascJune,
Fig. 4 shows a vertical one

Centrifugal head, pivoting the pen

F i g. 5 schematically the verscüwenKung

flap,. TVretellune the drive

F i g. 6 in perspective u-rsieuung u

for the pendulum flap, control

F i g. 7 essentially snapshot cue of the drive of the pendulum flap cover,

F i g. 8 euien Q ^^ Ä ^ Se VIII-nach F i g. 1 corresponding to the there to VIII.

According to Fig. 1 Is_Open jf ^ £ place a ladle Il auigesi j, Fig. 1 Fordermitt.a not shown, a ζ u kenkran whose Wutag "*" * ξ "J £ j * & assumed is ged to ^ e Bearbeitungssteue bottom 12 of the The pouring ladle has already been lined with miwe Steinen 13. D »Jg £ f _with fende side wall 14 of the wap

_{8 g} e _h , ve, de, Λ «*.

Process for compacting plastic molding compounds by centrifuging, in particular for lining casting ladles, whereby the molding compound jet emerging from a centrifugal molding machine is guided in closed contours without reversing its direction, according to the invention, that the molding compound jet is deflected after exiting the centrifugal wheel in such a way that it is perpendicular to the advancing one Movement of the centrifugal head oscillates at a frequency of more than 50 strokes per minute. This measure brings about an even distribution of the mass to be introduced, which leads to a more even and thus improved Fe and emen
ner upper
After ^
clothes 21
fiterer lüng 16

downward
n side

Progress of the

formmaschme up to

inteSr invention From _g estaH _{ung is} proposed that the molding composition beam applied in sinusoidal curves and the sinusoidal curves successively applied molding composition beams are shifted.

The solution according to the invention is particularly advantageous in connection with the measure known per se that mnere successively in a casting mold Formwork rings are introduced their respective Height corresponds to part of the height of the pouring ladle wall, and the molding compound stream is approximately from the height of the free upper edge of the topmost Ring is thrown in

A device according to the invention is characterized by one arranged on the centrifugal housing, with a frequency of more than 50 in particular 100 to 250 strokes per minute moving pendulum flap, with a further inventive opening d.sem

_{20 occurs}

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Ringes will then be a ^ request _{echen {Jen}

ffidaß it to the lower ring 16. Meanwhile, _{N ch} a sinngemäßem

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upper cana

SSS on its run ^^

on not
a ^

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50 is located

Slide and roller rails υ _{bar is)}

the housing 28 of this occurs vertically downwards. Increase 30 of the pan

^ ^st * "Pj * 3S, Er 32 present, in which the one storage bunker" ^ ^or "is storage bunker

^^^ S ^ M formed by a ^^^ S ^^^ 33, the

over the drive roller 34 from a drive motor via a: An neosw _{se auf em Trans} .

³ ^ moves. ^we ° ^un ^ ^{a e} £ _{e opposite} the hori-55 portomd ^ J ^^^ kJ ^ tong 37 anzonal emsteüDar ^ ^ _axis ^ _ver _

! ^ Length so extendable,

1 ™ fire supervision of the facility «cn Fig. 1,

going

28 about the pivot axis 40 pivotable pendulum flap 41, which over the piston rod 42 of the piston-cylinder arrangement 43 is moved.

The molding compound 29 is transported at high speed from the conveyor belt 44 into the hopper 45 of the centrifugal head housing and is captured there by the blade 46 of the centrifugal wheel 47. The centrifugal wheel 47 rotates at a peripheral speed of about 50 to 65 m per second, depending on the molding material and its desired compression.

The molding compound jet 29 usually emerges tangentially with a constant direction. Through the Pendulum flap 41 a constant change of direction is made, in such a way Measure that the deflection from the unhindered tangential throwing direction an amount up to 20 ° after inside matters. The pendulum flap 41 is advantageously 200 strokes per minute moved about the pivot axis 40, a device for this in connection with FIGS. 6 and 7 described will. The stroke is understood to mean the complete back and forth movement.

To the shuttle valve 41, a pin 41 is available α at which rotatably supports a connecting piece 48 angeor: which is connected to the piston rod 42 · <.li vi i>. The piston rod 42 is provided with one of FIGS. 7 piston 49 which can be seen is provided, which is reciprocated in the cylinder 43. The piston rod 42 is extended in such a way that it also protrudes from the other end of the cylinder and thus has a further part 42 '. At the two ends protruding from the cylinder 43, the piston rod 42, 42 'is provided with stops 50 and 50', which each serve to be able to change the stroke of the piston rod and thus the angular deflection of the pendulum flap 41. In order to achieve this, there is another cylinder 51 parallel to cylinder 43, which has two separate piston chambers 52 and 53, in each of which associated pistons 54 and 55 are arranged, which have piston rods 56 and 57 on one side only. The mode of action is as follows:

Via the control valve 58, in connection with the two hydraulic lines 59 and 60, the piston 49 alternately applied from one side and then from the other side with a high sequence, see above that he exercises 200 strokes per minute according to the embodiment

The pendulum flap 41 linked to the piston rod 42 thus also exerts 200 strokes per minute. In order to be able to adjust the length of the strokes carried out, the pistons 54 and 55 are used with the associated ones Piston rods 56 and 57. For this purpose, piston 55 with piston rod 57 is the control valve 61 and the piston 54 with the piston rod 56 are assigned the control valve 62 move the piston rods 57 and 56 out of the associated cylinders by a desired amount. The stops attached to the piston rod 42, 42 ' 50 and 50 'strike the associated piston rods 56 and 57, whereby the stroke length the piston rod 42 and thus the angular deflection of the pendulum flap is determined. It is understandable, that with the switching and control arrangement according to F i g. 7 over the control valves both the frequency and the amplitude can be set at any time and is also adjustable at any time.

It should be noted that the drive of the pendulum flap causes it to vibrate at a high frequency move, can also be done by other drives, for example by a high-speed eccentric, on which a rod 42 is present, the eccentric being provided to be adjustable at the same time is.

The pendulum flap 41 is, as shown in particular in FIG. 6 shows, with a replaceable wear plate 63 provided. F i g. 6 also shows that the pivot axis 40 of the pendulum flap is made of plastic or rubber is mounted. This means that when the molding compound hits the ball, which are thrown from the centrifugal vane 46 onto the pendulum flap and from this after bounce off a deflection, the pendulum flap is also set in natural oscillations, so that thereby a further uniform distribution of the molding compound od at its point of impact in the pouring ladle. The like. Achieved will. Under certain circumstances, however, it is expedient and provided that a vibrator 64 is arranged, which oscillates the pendulum flap at a low angular deflection with one frequency offset by 1000 and more strokes per minute.

According to FIG. 8 is the cylindrical cavity between the outer wall 14 of the pouring ladle 11 and the shuttering ring 16 is filled with the lining 21 in the form of the molding compound. If the centrifugal head // rotates about the pivot axis 65 in the indicated arrow direction 66, namely at one speed of 20 m per minute, then it follows that at a frequency of the pendulum flap with 200 strokes per minute on a section of 33 cm, which corresponds to the distance covered in one second, the molding compound in three adjacent double loops on a sinusoidal line is placed. During the next revolution a phase shift has taken place, so that the first Sinusoidal curves shown in solid line to the sinusoidal curves of the second round, which are shown in dashed lines, are shifted. Since also with the respective following In revolutions there is always a phase shift that occurs by itself, since it is purely coincidental if the curves would coincide in successive revolutions, the result is an even distribution of the molding compounds or, in other words, always a nesting of the bales of molding material that be thrown from the centrifugal blade 46 and a length of 140 mm with a width of 40 mm. However, when it hits the pendulum flap, these dimensions are blurred. the Dimensions of the bales were given for the purpose of demonstration, so on the basis of these dimensions and the sinusoidal curve according to FIG. 8 it is shown that by the oscillating pendulum flap an equal distribution takes place. The centrifugal wheel throws off around 30 bales per second. The adjustment of the angular range of the deflection of the pendulum flap is used to ensure that the molding compound jets of the width of the annular gap can adjust and also take into account the distance from the centrifugal head to the point of impact of the molding compound will, since the greater the distance, the smaller the adjustment angle of the pendulum flap has to be observed sird than with a smaller distance to the molding compound over the entire gap width in the specified sinusoidal To distribute curve progression.

F i g. 4 shows that the overhead wall of the hopper 45 on the centrifugal head housing. through a wear plate 67 is formed in connection with a heating plate 68. The heating plate 68 prevents the setting of the molding material within the hopper, especially since the molding material 29 of the Conveyor belt 44 is conveyed at high speed into the hopper 45 and thereby against the inner wall bounces. _

F i g. 4 also shows that the peripheral surface "des Centrifugal head housing in the area of the transport path of the molding compound through the centrifugal shovel 46 from several wear plates 69, 69 'and 69 ", assembled in the manner of tongue and groove consists. The first wear plate 69 and the last one are in the direction of movement of the molding sand Wear plate 69 ″ each is provided with lugs protruding outward in one piece, the lug 70 of the lower wear plate is at a front

jump 71 is supported on the centrifugal head housing and the nose 72 on the upper wear plate 69 of a clamping screw 74 provided with a nose 73 is detected, which through the wall of the centrifugal head housing is led to the outside and is tensioned there.

F i g. 4 also shows that the centrifugal head housing viewed in the direction of rotation of the centrifugal wheel 47 is provided with a vent opening 75 in a close area in front of the filling funnel 45. Farther is seen in the direction of rotation of the centrifugal wheel in an area shortly before the pendulum flap 41 a Moisture supply line 76 is present, which opens into the centrifugal head housing.

F i g. 5 shows the maximum deflection of the pendulum flap over an angle of 20 ° while at the same time Via the vibrator on the pendulum flap, this is done at a very high frequency by an angle of 1 to 3 ° swings.

For this purpose 2 sheets of drawings

Claims (14)

Patent claims: 1. Process for compressing plastic molding compounds by centrifuging, in particular for lining casting ladles, the molding compound jet emerging from a centrifugal molding machine is guided in closed contours without reversing direction, characterized in that that the molding compound jet is deflected after its exit from the centrifugal wheel in such a way that it is perpendicular to the advancing one Movement of the centrifugal head with a frequency of more than 50 strokes per minute oscillates. 2. The method according to claim 1, characterized in that the molding compound jet with oscillates at a frequency of 100 to 250 strokes per minute. 3. The method according to claim 1, characterized ge ao indicates that the molding compound jet to an angle of 1 to 20 ° is moved. 4. The method according to claim 1, characterized in that the molding compound jet in sinusoidal Curves applied and the sinusoidal as curves of sequentially applied molding compound jets be moved. 5. The method according to claim 1, characterized in that in a known manner are successively introduced into a pouring ladle inner formwork rings, their respective Height corresponds to part of the height of the pouring ladle wall and the molding compound stream is approximately is thrown in from the height of the free upper edge of the respective uppermost ring. 6. Apparatus for performing the method according to claim 1, characterized by a arranged on the centrifugal housing, with a frequency of more than 50, in particular 100 to The pendulum flap moves 250 strokes per minute. 7. Apparatus according to claim 6, characterized in that the pendulum flap (41) at the ejection end of the centrifugal head housing is infinitely adjustable. 8. Apparatus according to claim 7, characterized in that the pivot axis (40) of the Pendulum flap (41) runs parallel to the axis of the centrifugal wheel and essentially at right angles A pneumatically or hydraulically operated piston-cylinder unit for the pendulum flap on the centrifugal head housing (43) is present, the piston rod (42) is hinged to the pendulum flap (41). 9. Apparatus according to claim 8, characterized in that the piston-cylinder unit from a first cylinder (43) with a piston (49) acted upon on both sides with both sides existing piston rod (42, 42 ') protruding on both sides of the cylinder, which is provided with stops (50, 50 ') on both protruding parts, and parallel to this first cylinder with the double-sided piston rod, a second one, divided into two chambers Cylinder (51) is present, in each of these two cylinder chambers (52, 53) a double-sided acted upon piston (54, 55) with one protruding from the cylinder chamber only on one side Piston rod (56, 57) is present. 10 Apparatus according to claim 6, characterized in that the pivot axis (40) of the Pendulum flap (41) is mounted in sleeves made of rubber or plastic. , 11 Device according to Claim 6, characterized in that that the pendulum flap is moved by an eccentric drive ...., 12. The device according to claim 6, characterized in that that a vibrator (64) is attached to the pendulum flap (41) ..... 13 Device according to claim 6, characterized in that the pendulum flap (41) with a replaceable wear plate (63) is provided. L ^ jj. 14 Apparatus according to claim 6, characterized in that the overhead wall of the Filling funnel on the centrifugal head housing completely or partially through a wear plate (67) in Connection with a heating plate (68) is formed