DE1919223A1 - Auxiliary device for centering the centrifugal drum of pendulum centrifuges when clearing at high speed - Google Patents

Description

PATENT LAWYERS

BRAUNSCHWEIG MUNICH

Braunschweigische -Maschinenbauanstalt, Braunschweig,

At the old train station 5

"Auxiliary device for centering the centrifugal drum of Pendulum centrifuges "when clearing at high speed"

The invention relates to an auxiliary device for centering the centrifugal drum of pendulum centrifuges when clearing high speed, at which the drum shaft during broaching in an at least temporarily against radial Deflection of rigidly supported bearings is performed.

The clearing of pendulum centrifuges can be done without special measures can only be made at relatively low speeds of the order of about 50 rpm, because the result the pendulum suspension possible deflections of the centrifugal drum can lead to "that the clearing knife or the clearing tool destroys the screen jacket of the centrifugal drum. The clearing out at low drum speeds is in addition to other disadvantages, above all with a considerable extension of the duration of the individual work cycles connected to a centrifuge. The centrifugal drum must namely from the high spin speed to the low clearing speed decelerated from 50 rpm before the discharge

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Process "can be started. Braking naturally requires Time. Broaching can also take place at the low oil speed id it only a small front shoe of the clearing cutter or Räuinwerkzeuges are carried out. Filled before after clearing the centrifugal drum must be on Dren- again. numbers on the order of 200-300 rpm can be accelerated. For the low clearing speed, the drive motors the centrifuges are equipped with an additional pole stage when they are trained as pole-changing asynchronous machines which can usually only be achieved by using the tandem construction, i.e. adding an additional iDotor which increases the axial length, can be implemented in practice. Result from this not only high acquisition costs, but also undesirably large heights of the centrifuges.

To avoid the disadvantages outlined, it would be advantageous to if the broaching is carried out at the comparatively high filling speeds of the order of 200-300 rpm could be. For this, however, it is necessary to use the centrifugal drum to be centered or stored in such a way that deflections are impossible.

In known designs of the auxiliary device mentioned at the beginning, bearings are arranged below the centrifugal drum in the area of the failure space, which bearings are supported by means of radially extending arms with the centrifuge housing or in some other way. Depending on the design of the auxiliary device, the bearings are either permanently connected to the lower end of the drum shaft or at the beginning of the clearing process.

009843/0103 ₃ ",

gear moved from below into a recess in the Troramelwelle. In the case of bearings that are retracted in the axial direction from below, the support arms are rigid, while they are used in bearings, for example as sleeves or rings with the Troromel shaft remain connected, either in the form of rigid assemblies of each or are designed as hydraulic or pneumatic working members that operate during normal spin operation Allow radial deflections of the centrifugal drum when clearing out however, strong resistance to such Auslen- ™ exercise.

However, it was not possible to achieve satisfactory results with the known auxiliary devices. The radial arms lie in the way of the centrifuged material when it exits the drum into the failure space. In sugar centrifuges, encrustation of the arms inevitably takes place relatively quickly, and the outlet cross-section of the sugar is considerably reduced. The Anne as well as the camp A held by them are difficult to access due to the arrangement in the failure room. Devices below the drum shaft usually also lead to an undesirable increase in the overall height of centrifuges.

A considerable further disadvantage exists in the case of auxiliary devices which can be retracted into the drum shaft from below Bearings or thorns in such a way that these bearings or thorns are subject to very high wear when entering the Troramelwelüe are exposed and therefore only have a limited lifespan

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009843/0 C3 ORIGINAL BATHROOM

own. This high stress results from the fact that the lower end of the Tromrael shaft only in exceptional cases runs in a runic manner and symmetrically to the axis of rotation of the centrifugal drum, that the running-in process of the bearing can be carried out without jolts and jolts.

The invention is based on the object of designing an auxiliary device of the type described so that the described Disadvantages of known designs are avoided.

This object is achieved according to the invention in that the drum shaft ± xa area of the upper drum edge is equipped with an axially displaceable sleeve which carries a low-friction pivot bearing surrounded by an outer protective jacket and that in the area of the upper drum edge on the centrifuge housing a centering ring coaxial to the drum shaft is rigidly attached, in d & n the sleeve with the bearing and the protective jacket can be retracted and extended from above.

The new design of the auxiliary device avoids components within the inaccessible failure space and in the area of the failing centrifugal material. The sleeve, which is axially displaceable on the drum shaft, also carries a sleeve that is designed to be low-friction Pivot bearing with a protective cover, so that the retraction of this bearing in the centering ring with the assistance of the Pivot bearing largely wear-free / done. Besides, the The sleeve with the pivot bearing is very easily accessible due to the arrangement above the upper edge of the drum. This is not just the.

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I _1n area between the hub star and the lower one

Most centrifuges have one in an axial direction

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To release centrifugal material. The fact that both this bottom cap and the sleeve of the new auxiliary device in the axial direction raised and lowered are wet in a further advantageous embodiment of this auxiliary device is used in that the sleeve with the bottom closure hood the drum is rigidly connected for common actuation, the bearing of the sleeve in the closed position located bottom cap is arranged outside of the centering ring, but when opening or lowering the hood enters the centering ring.

In an expedient further development of the new auxiliary device, the sleeve has a circumferential groove into which a fork, which is connected to a drive mechanism for axial displacement, engages, and the end position of the groove can be adjusted to the end position of the fork when the sleeve is raised. to keep the fork free of use of the axial play in relation to the groove.

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An embodiment of the new auxiliary device is in shown in the drawings.

Fig. 1 shows an axial section through the centrifugal drum

one equipped with the new auxiliary device. Pendulum centrifuge,

Pig. FIG. 2 shows a detail of the device shown in FIG in a sectional view "at along the line II-II running "cutting plane.

The Mg. 1 shows a centrifugal drum 1 of a pendulum centrifuge, which is attached to an Iromroel shaft 3 by means of an Eabenstemes 2 is. The drum shaft 3 is not shown at the top Bearings pivoting at the end. The spin drum is inside a centrifuge housing 4, which encloses a failure space 5 below the centrifugal drum.

In the area above the upper edge of the centrifugal drum 1, a centering ring 6 is arranged coaxially to the drum shaft 3. This centering ring serves to accommodate a protective jacket 7 and a rotary bearing 7a enclosed by this for centering the centrifugal drum 1. In order to avoid radial deflections of the centering ring 6, it is connected to an upper edge 8 of the centrifuge housing 4 via rigid arms 6a. The rotary bearing 7a, designed as a roller bearing, is attached to a sleeve 11 which is displaceable in the axial direction of the drum shaft 3. Two end positions are possible. One end position is shown in FIG. 1 in the right half, the other in the left half . It can be seen

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that the protective sheath. 7 with bearing 7a in the one on the left Half of the position shown in FIG. 1 from the centering ring 6 is extended, but is retracted into the centering ring 6 in the position shown in the right half of the figure. In order to facilitate the retraction, the centering ring 6 is widened conically towards the top, while the protective jacket 7 towards the top is beveled or rounded at the bottom.

1 also shows that the sleeve 11 has an axially displaceable tube 9 surrounding the drum tube 3 with (f a bottom closure hood 10 is connected, which is mounted at the lower end of the centrifugal drum 1 in a height-adjustable manner. In the left half of FIG. 1, the bottom cap 10 assumes the closed position, while in the right half Fig. 1 shows the open position which the bottom cap 10 assumes during the clearing process.

The sleeve 11, which is axially displaceable on the drum shaft 3, has a groove 11a into which pins 12 of a fork 13 engage, which is connected to a drive device 14. Means This drive devices acting on the sleeve 11 via the fork 13 can be the sleeve 11 with the protective jacket 7 and the bearing 7a and the tube connected to the sleeve 11 with the bottom cap 10 in the two in Fig.1 Transfer shown end positions. The drive device 14 can, as FIG. 1 indicates, in the form of a hydraulic one or a pneumatic working member.

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The Pig. 1 shows that the upper end position of the sleeve is defined by a stop ring 17, which is firmly attached to the Troromelwelle 3 is attached. The sleeve 11, together with the pipe 9 and the floor closure assembly 10, is against this stop ring 17 γόη a spring 16 pressed, the sieve in the area of the lower The end of the drum shaft 3 is supported on the hub star. The fork 13 is received in the groove 11a with axial play and allows sieve to be set in the upper end position, for example by springs 18, so that a contact-free engagement in the upper end position is guaranteed. Such a non-contact In view of the high speeds of the drum shaft 3 during spinning, interference is to be avoided unnecessary wear beneficial. ' Wear and tear, but also in other ways, e.g. through. Use of roller bearings or the like., Avoided.

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Claims (3)

- 9 .- Claims •1. Auxiliary device for centering the centrifugal drum of pendulum centrifuges when clearing rait high speed at which the drum shaft during the broaching in an at least temporarily temporarily rigidly supported against radial deflection Bearing is guided, thereby marked- ^ shows that the drum shaft (3) in the area of the upper drum edge with an axially displaceable sleeve (B (11) is equipped, which carries a low-friction pivot bearing (7a) surrounded by an outer protective jacket (7), and that in the area of the upper edge of the drum on the centrifuge housing (4) a centering ring (6) coaxial with the drum shaft is rigidly attached, in which the sleeve with the bearing and the protective jacket can be retracted and extended from above. 2. Auxiliary device according to claim 1, characterized in that the sleeve (11) with the λ bottom cap (10) of the drum (1) is rigidly connected for common actuation, the bearing (7a) of the sleeve when the bottom cap is in the closed position outside of the centering ring (6), but enters the centering ring when the hood is opened or lowered. 3. Auxiliary device according to claim 1 and / or 2, characterized in that the sleeve (11) has an um- -10- 009843/0103 - ίο - Has catch groove (11a), in which one for axial displacement the sleeve with a drive device (14) connected fork (13) engages with axial play, and that the end position the groove is adjustable in relation to the end position of the fork when the sleeve is raised, in order to lower the fork Utilization of the axial play in relation to the groove without contact to keep. 009843/0103