DE2122159A1 - Mixing device - Google Patents

Description

_ΡΑ -; γμ- ■ **, »/ ALT

H.
_6F , -r. τ ··: a70 May 4, 1971

-.: .... -. - :. 51/079 Gzk / Ha.

Rubber and Plastics Research. Association of Great Britain

Mixing device

The invention relates to a mixing device.

In accordance with the invention, there is provided a mixing device comprising a pair of coaxially disposed chambers connected by a plurality of through openings that are spaced between a set of radially extending chambers. Rollers and two ring-shaped raceways bearing the rollers? In addition, the inventive device has a device that causes a relative rotation of the rollers and the raceways, and a device for supplying material to be mixed to one of the chambers such that the mixture is pressed through the passage soff voltages between the rollers and äen raceways ·

Me rollers can be cylindrical, for which a suitable cage must be provided, but preferably they are conical.

In a preferred embodiment, a second set of Rollers are provided, the individual rollers of which extend radially between a second pair of coaxial chambers, the. the latter chambers are connected by several passage openings between the second set of rollers and a pair are formed by annular raceways for these rollers;

1Q38S3 / 1643

the two radially outer chambers of the two pairs are with each other connected via an annular passage opening, whereby causing the mixture to pass through both sets of rollers on its way through the mixer.

The means for supplying the material usually comprises a screw conveyor which is rotatably mounted in a cylindrical housing for transporting the material to the radially inner chamber W of the first pair of chambers.

Other features, advantages and possible uses of the new Invention emerge from the following description of an exemplary embodiment and the drawing. The single figure shows an axial section through a mixing device designed according to the invention.

Me mixing device has a coiled screw conveyor Io which is rotatable within a cylindrical housing 12 is arranged, wherein one end of the conveyor 1o is mounted in an end wall 14 of the housing 12 and the other end in a cylindrical Chamber 16 is mounted, which has a larger diameter than the housing 12, but is connected to this. the Connection between the conveyor 1o and the end wall bearing is through a gasket, such as a gland 18, is sealed to ensure that all material that enters an inlet port 2o is given, which is arranged at the end of the housing 12 adjacent to the wall 14, also through the housing 12 by means of the conveyor 1o is transported. The end of the screw conveyor to, which projects from the end wall 14 of the housing 12, is connected to a drive device (not shown), whereby the conveyor can be rotated, preferably with

109853/1643

constant speed.

The end of the screw conveyor remote from the end wall 14 carries a circular disk 22 which is inside the cylindrical Chamber 16 is arranged by means of two bearings 24, 26, each of which has two flat truncated cone-shaped raceways and several having conical lumps. Camp 24 is between the Disk 22 and an end wall 28 of the housing, with its one conical raceway 3o connected to the disk 22 and rotates with it and its other track 32 with the stationary end wall 28 of the housing 16 connected is. The arrangement is such that an annular chamber 6o is formed radially inside the rollers 4o is between the rollers 4o and the shaft 1o of the tube conveyor; by the conveyor material is conveyed from the inlet opening 2o to this chamber 6o. Besides we * an annular chamber 62 radially outside the rollers 4o between them and the inner cylindrical wall of the housing 16 formed.

is
The bearing 26 is disposed between the disc 22 and the other end wall 34 of the housing 16, with its one conical raceway 36 connected to and rotating with the disc 22 and its other raceway 38 connected to the stationary end wall 34 of the housing 16. A plurality of rollers 4o and 42 are rotatably accommodated between the pairs of conical raceways 3o, 32 and 36, 38, each adjacent rollers being in longitudinal contact on their circumference. In this way, a pair of passages of approximately triangular cross-section are formed between each pair of adjacent rollers and the corresponding roller-bearing raceways

109853 / 16A3

educated. As with the bearing 24, chambers 64 and 66 are formed radially inside and radially outside of the rollers 42, respectively. An annular passage opening 44 is formed between the peripheral surface of the disc 22 and the side wall of the housing 16, which connects the chambers 62 and 66 and thus also the passage openings of the bearing 24 with those of the bearing 26.

The chamber 64 at the radially inner end of the passage opening of the bearing 26 is in communication with an annular one Passage opening 46 * between the raceway parts of the Bearing 26 and a cylindrical extension 48 of the shaft of the screw conveyor 1 o is formed. This cylindrical Extension 48 terminates in a conical portion 5o which cooperates with a threaded plug 52, which has an orifice or nozzle 54 to provide an adjustable outlet for the device, as later is explained in more detail.

The cylindrical housing 16 is connected to the housing 12 by means an annular flange forming the end wall of the housing 16; the connection is through several Bolts 56 and spring washers 58 are formed which serve to keep the rollers and races of the two bearings 24 and 26 in contact to keep.

In operation, the conveyor is 1o at a constant speed rotated, whereby the rollers 4o and 42 are also rotated, since they are in rolling contact with the sioh rotating raceways 3o and 36 respectively. Roughly premixed material is poured into the

109853 / 16Λ3

Housing 12 inserted through the inlet opening 2ο and along The housing 12 is conveyed further in the direction of the disk 22 by the screw conveyor 1o. If it's the chamber reaches the bearing 24, the axial path of the material is blocked by the disc 22; the material is forced move radially outward through the passage openings, which are formed between the rollers 4o and their raceways and 33, and enters the chamber 62. At This passage through the rolls is followed by an intensive fulling that is carefully mixed and dispersed Material results. The material is then pressed through the annular passage opening 44 into the chamber 66, from which it radially inwards through the passage openings between the pulleys 42 and their raceways 36 and 58 in the annular chamber 64 arrives, the material again being subjected to intensive tumbling and mixing will. The material then passes through the passage opening 46 and finally passes through the outlet nozzle 54 submitted. The nozzle 54 is screwed into the end of the housing 16 so that the gap between it and the conical Extension 5o can be changed, whereby the back pressure in the housing 16 can be adjusted to to control the throughput of the mixer and to increase or decrease the time during which the material is processed Is exposed to flexing.

If a reinforced mix is required with high throughput rates, can add additional sheaves 22 and additional sets of tracks and rollers on the end of the conveyor shaft are attached, which are then in series with those shown in the embodiment.

109853/1643

The screw conveyor 1 ο can be replaced by another suitable Means for feeding the material radially inwards to the first bearing, from where it is outwardly replaced by this Bearing 24 is pushed through.

While tapered rollers are preferred, they can be replaced by cylindrical rollers that are in a suitable one Be kept in a cage. For mixing certain materials, it is advantageous to provide the housing 16 with a cooling water jacket to surround.

In the embodiment shown, the disk 22 is separated from the adjacent races 3o and 36; these Components can also be made in one piece.

109853/1643

Claims (1)

Patent claims: 1. Mixing device, characterized by a pair of coaxially arranged chambers (6o, 62) which are passed through a plurality of passage openings connected between a set of radially extending rollers (4o) and both of them ring-shaped supporting raceways (3o, 32) are formed, a Antriebseisnrichtung (1o) for relative rotation of the Rollers and the raceways, and a conveyor (1o, 12) for supplying material to be mixed to one of the chambers in such a way that the mixture passes through the passage openings between the rollers (4o) and the raceways (3o, 32) is pressed. 2. Mixing device according to claim 1, characterized in that that the rollers (4o) are conical. 3. Mixing device according to claim 1, characterized in that that the rollers (4o) are cylindrical. 4. Mixing device according to claim 2 or 3 _f, characterized in that adjacent rollers (4o) are in longitudinal contact on their periphery, whereby pairs of these adjacent rollers (4o) form two passage openings with the raceways (3o, 32). 5. Mixing device according to one of claims 1 to 4, characterized in that a second set of rollers is provided is whose individual rollers (42) extend radially between a second pair of axial chambers (64, 66), 109853/1643 the chambers (64, 66) being connected by a plurality of through openings formed between the first set of rollers (42) and a pair of annular raceways (36, 38) for those lobes, the radially outer chambers (62, 66 ) are connected to one another by means of an annular passage opening (4-4), whereby the mixture is forced to pass through both sets of lobes (4o, 42) on its way through the mixing device, 6 / Mixing device according to one of Claims 1 to 5, characterized in that characterized in that the conveyor is designed as a screw conveyor (1ο) which can be rotated in a cylindrical housing is to transport material from a material inlet (2o) to the radially inner chamber (6o) « 7. Mixing device according to Claim 6, characterized in that that the screw conveyor has a shaft (1o) which extends coaxially through the one or each radially inner chamber (6o, 64) and carries a race (3o, 36), which is connected to the one or each roller set (4o, 42) for common rotation, whereby in one rotation the shaft (1ο) of a race or the races (3o, 36) relative to the other (32, 38) is rotated to a To cause rotation of the lobes (4o, 42) which are arranged between them, 8. Mixing device according to claims 5 to 7, characterized in that a disc (22) is arranged coaxially on the conveyor shaft (10) and that each side of the disc (22) each has a race (3o, 36) which is connected to a 109853/1643 - ο - which is connected by rollers (4o, 42) at Äen, wherein the other race ring (32, 38) for each roller set (4o, 42) is rigidly attached. 9. Msch device according to claim 8, characterized in that that the lauxrings (3o, 36) carried by the disc (22) are carried out in one piece with this. 10. Mixing device according to claim 5 *, characterized in that one or more additional sets of rollers are provided between corresponding additional pairs of races, and that the through openings formed thereby are arranged so that they are in series with filing the first and second roller sets (4o , 42) lie. 11. Mixing device according to any one of claims 1 to Vo, thereby characterized in that an adjustable nozzle (54) & £ 'Muslaß of the device is provided, by means of which the back pressure within the device can be adjusted to to control their throughput and to control the time during which the material is exposed to the mixing action 12. Mixing device according to one of claims 1 to 11, characterized characterized in that the one or more sets of rollers (4o, 42) and their associated races, (3o, 32; 36, 38) are contained in a cylindrical housing (16). Ί09853 / 16Α3 Λ *. Blank page