DE7520501U - CONICAL MIXING DEVICE WITH MIXING SCREW SUPPORT - Google Patents

Description

description
to the utility model application
the company Vennootschap on the company Machinefabriek Vrieco

concerning:

"Conical mixing device with mixing screw support"

The innovation relates to a mixing device nit at least one mixing vessel with a conical side wall and vertical center line, and with one arranged in this vessel, at the upper end by means of a drive-driven mixing screw, the center line of which is parallel to a surface line of the conical side wall runs, in the middle which drive the Screw around its center line and around the center line at the same time of the vessel is rotatable and is flexibly supported at the upper end, while the lower end of the mixing screw axis is stored in a warehouse near the bottom of the vessel.

Such mixing devices are known, e.g. 3. from NL-PS 110 847. The mixing screw is known in these mixing devices stored in such a way that the - during det: operation acting on it axial and radial forces, caused by gravity and by the reaction forces of the processed Material, both on the upper and on the lower side of the mixing screw axis. According to the said Document, the upper end of the axle is connected by means of a driven swing arm via a claw coupling, wherein

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a spring arranged between these parts supports the coupling parts in an axially displaceable manner and the tapered lower one Forcing the end of the axle to stay in a pin-roller bearing pot or support journal bearing. This Pinollager should always be considerable absorb axial forces and is subject to high wear due to the point load, which is increased even further, when the material processed by the mixing device has abrasive properties. For this reason the Pinollager often replaced.

The task of the innovation is to eliminate this disadvantage.

According to the teaching of the innovation, this is achieved by that the support of the upper end of the mixing screw is designed to absorb all axial forces on the screw and that the bearing in the vicinity of the vessel bottom consists of a horizontal bearing ring supported by the vessel, with a Internal diameter in the order of magnitude of the external diameter of the horizontal cross-section of the cylindrical mixing screw axis at the point while the inner ring surface from which Seen from the center of the ring, it is convex.

Due to the fact that the mixing screw axis is now practically only supported at the upper end (so-called flying Storage), the bearing near the bottom of the vessel only needs too large lateral deflections at its free lower end and therefore to prevent bending loads in the screw. Such Rashes could occur as a result of vibrations generated in the screw or concentrations of hard material in the vicinity of the screw of the bottom of the vessel. The end of the axis therefore only comes into contact with the inner surface of the ring in exceptional cases.

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The convex shape of this surface is adapted to the inclined position of the axis with respect to the ring center line. The resulting play between the end of the axle and the ring is not disadvantageous, while the bearing does not act against the processed material needs to be closed because the material can move through the space between the ring and the axle, which hardly causes wear because of the absence of any real load. Oa the camp just a ring is relatively low in height, the advantage mentioned with regard to the above-mentioned known mixing device remains that näralich the screw blade can go through to the bottom of the vessel, obtain.

Preferably, the upper end support is the Screw formed in that the upper end of the screw is connected to the drive by means of a cross coupling. Through this the result is a compact construction which is flexible and is able to absorb both radial and axial forces.

It is useful if the inside of the ring The end of the mixing screw and / or the bearing ring includes a replaceable part made of wear-resistant material. For longer This is because, despite the low load on the lower bearing, a certain amount of wear will occur during operation, especially when abrasive material * The innovation is explained in more detail below with reference to the drawing, in which an embodiment of the according to the innovation mixing device is shown.

Show it:

Fig. 1 is a schematic longitudinal section through a mixing vessel with the screw of Mixing device; and

Fig. 2 is a vertical section of the lower end of the mixing screw with the Bearing ring in relation to Fig. 1 larger em scale.

In the illustrated conical mixing vessel 1, a mixing screw 2 with its shaft 3 is parallel to the surface line of the Mixing vessel stored. A screw blade 4, shown schematically and denoted by 4, is fastened on this shaft 3.

Above the open upper end of the mixing vessel 1 i3t a drive 5 is mounted, which has an output shaft 6 in the vertical center line of the vessel. On this shaft 6 is a swing arm 7 is attached, which protrudes radially from the shaft 6. A transmission head 8 is mounted at the free end of the arm 7, and whose output shaft 9 is via a coupling 10 with the Screw shaft 3 connected. The drive is designed in such a way that the arm 7 can be rotated around the center line of the vessel, while at the same time using suitable transmission gears Shaft 9 and from this the screw shaft 3 are driven to rotate around their own common center line.

The coupling 10 is some form of articulated coupling which enables the propulsion of the screw shaft 3 by means of the arm 7, the center lines of which are angled towards each other. At the same time, this articulated coupling 10 is designed in such a way that both the axial and the radial on the screw ' 2 acting forces can absorb.

The support of the screw shaft 3 at the lower end near the bottom of the vessel 1 is shown in detail in FIG. At the bottom 11 of the mixing vessel 1 is centered with respect to the vessel center line, a lower seat 12 is mounted, which seat is annular and on the top a recess 13 for

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Has receiving a bearing ring 14 made of wear-resistant material. The ring 14 is also ring-shaped in the seat Cover 15 included, which cover has a central recess 16 which corresponds to recess 13. The whole unit of seat 12, ring 14 and cover 15 is on the bottom 11 by means of three with mutual circumferential spacing of 120 ° provided head screws 17 with the interposition of spacer sleeves 18 attached. The ends of the cap screws are screwed into threaded holes in cover 15, while the screws pass through through holes in seat 12 get lost.

The bearing ring has an inner surface which is convex when viewed from the center of the ring. This convex inner surface 19 allows the rotating oscillating movement of the screw shaft 3 around the shaft 6, despite the oblique position of the Screw shaft opposite the bearing ring.

So that if the end of the mixing screw shaft becomes worn after a long period of time, this phenomenon can be eliminated can, this end is provided with a separately inserted end piece 20, which in a blind hole at the end of the mixing screw shaft 3 is included. This end piece 20 is fixed by means of a head clip 21, while a locking pin 22 could be provided to prevent loosening of the end piece, which pin with a recess 23 at the upper end of the end piece 20 is engaged.

It is clear that in the construction shown, both the end piece 20 and the bearing ring 14 when worn are easily removable and replaceable. For this purpose, the bottom 11 of the mixing vessel 1 could also be used (not shown) Screws to be attached to a flange 24 at the lower end of the conical side wall of the mixing vessel, so that only the Bottom 11 can be solved and from this bottom, after loosening the head screws 17 and after removing the cover 15, the Bearing ring 14 can be replaced.

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It is clear that because of the small height, which £

only to occupy the lower camp above the bottom of the vessel i

1, the screw blade 2 of the mixing screw slightly up to ί

can go through to the bottom 11 of the vessel. S.

The articulated coupling 10 is preferably a simple, |

known cross-coupling. §!

- Protection claims -

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Claims (3)

Protection claims 1. Mixing device with at least one mixing vessel with a conical side wall and vertical center line and with a mixing screw arranged in this vessel and driven at the upper end by means of a drive, the center line of which runs parallel to a manfcüllinie of the conical side wall, by means of which drive the screw closes at the same time is rotatable around its center line and around the center line of the vessel and is flexibly supported at the upper end, while the lower end of the mixing screw axis is stored in a bearing near the bottom of the vessel is ^ i characterized in that the support of the upper The end of the mixing screw (2) is designed to absorb all axial forces on the screw and the bearing in the Near the vessel bottom (11) consists of a bearing ring (14) supported horizontally by the vessel (1), which ring has an inner diameter in the order of magnitude of the outer diameter of the horizontal cross-section of the cylindrical mixing screw axis at point (2G), while the inner ring « surface (19), seen from the center of the ring (14), is convex. 2. Apparatus according to claim 1, characterized in that the Support at the upper end of the mixing screw (2) is formed in that the upper end of the screw shaft (3) is connected to the drive (5) by means of a cross coupling (10) is. 3. Device according to claim 1 or 2, characterized in that that the mixing screw shaft end (20) located within the ring (14) and / or the bearing ring (14) comprises an exchangeable part made of wear-resistant material.