WO2013037435A1 - Screw press separator having a mixing screw - Google Patents

Abstract

The invention relates to a screw press separator (1) for separating solid constituents from the slurry containing solid and liquid constituents, comprising a screw press (30) for pressing out the slurry, a feeding apparatus (6) for introducing disinfectant into the pressed-out solid matter, and a mixer (3) for mixing the pressed-out solid matter with the disinfectant.

Description

 Press screw separator with mixing screw

description

The present invention relates to a screw extruder with mixing screw for the separation of solid components from a slurry containing solid and liquid components. The slurry includes in particular manure.

In livestock, litter in stables plays a significant role in profitability. For years, the solid obtained in the separation of the manure, for sprinkling, especially in the boxes of dairy cattle, used. At the same time, this creates a hygienic threat to the stocks. Through the return of existing from the excrements solids pathogens of individual animals are transferred quickly to the entire herd. The efforts to date, the solid by its own microbiological activity in large scale to sanitize drums are expensive and have the disadvantage of recontamination in a few days. The way of silation with lactic acid bacteria also forces not simple and lengthy process steps. For the separation of liquid manure into solid and liquid components usually press screw separators are used. The document EP 0 367 037 B1 shows, for example, such a press screw separator.

It is an object of the present invention to provide a press screw separator which, with a simple and inexpensive construction, serves both for separating solid constituents from a slurry containing solid and liquid constituents and for disinfecting the extruded solid.

This object is achieved by the features of claim 1. The subclaims have advantageous developments of the invention to the object.

Thus, the object is achieved by a press screw separator for separating solid components from a slurry containing solid and liquid components, comprising a press screw for squeezing the slurry, a feed device for introducing disinfectant into the squeezed solid and a mixer for mixing the squeezed solid with the disinfectant , According to the invention, the disinfectant means all substances which lead directly or indirectly to the reduction of the number of germs, in particular of the pathogens, in the expressed solid. The disinfectant can be used liquid or in powder form. In particular, acidic disinfectants are used. Lactic acid bacteria are also included, for example, by the term "disinfectant" according to the invention, since these bacteria produce an acidic environment and thus indirectly contribute to the reduction of microorganisms in the expressed solid.

According to the invention, therefore, a feeder for disinfectant and a mixer is integrated into the press screw separator or to the press screw separator. As a result, with a device and in a continuous process, the pulp, in particular the liquid manure, can be squeezed out and the resulting solid can be disinfected. At the same time, the press screw separator according to the invention also allows the use of the solid directly and untreated after the separation. Thus, only at incipient hygienic problems of the mixer and the feeder can be switched on. Preferably, the mixer for flanging is formed on the press screw. This allows the mixer to be easily mounted and dismounted.

 5

 It is particularly preferred that the mixer is mechanically drive-connected to the press screw. In particular, a mixer shaft of the mixer is flanged coaxially to the press screw. As a result, a common drive, for example an electric motor with gearbox, can be used for the press screw and for the mixer shaft.

Furthermore, it is preferably provided that the supply device comprises at least one nozzle for introducing the disinfectant. Via the nozzles, the disinfectant can be distributed particularly well.

 5

 Furthermore, it is preferably provided that the feed device comprises a metering device for regulating the introduced amount of disinfectant. This metering device comprises in particular a metering pump for pumping the disinfectant.

 ! 0

 Furthermore, the press screw separator preferably comprises a measuring device for measuring the exit velocity and / or the discharge quantity of the solid from the press screw. In particular, it is measured at the interface between press screw and mixer. Particularly preferably, the measuring device comprises a heat source with a subsequent temperature sensor. In addition, it is preferably provided that the metering device is designed to regulate the amount of disinfectant depending on the exit velocity and / or discharge amount of the solid from the press screw. As a result, the disinfectant can be dosed very needs-based.

 JO

Furthermore, it is advantageously provided that the mixer comprises a trough, wherein a front end of the trough is designed to discharge the mixed with disinfectant solid. Particularly preferably, the press screw is arranged horizontally. Similarly, the trough is horizontal. A forehead of the Trough connects directly to the press screw. The other end of the trough is used to discharge the disinfected solid. Particularly preferably, a weir is arranged at this front end. This, in particular adjustable weir, the residence time of the solid is regulated in the mixer. The mixer transports the solid over the weir. Preferably, the solid falls out of the trough on the other side of the weir.

Preferably, the supply device including the metering device and the nozzles for introducing acid or acidic solutions is formed.

In the following an embodiment of the invention will be explained in detail with reference to the accompanying drawings. 1 shows a press screw separator according to the invention according to an exemplary embodiment, a first detail view of the press screw separator according to the invention according to the exemplary embodiment, FIG. 3 shows a second detailed view of the press screw separator according to the invention, and FIG

Fig. 4 is a third detail view of the press screw separator according to the invention according to the embodiment.

In the following, an embodiment of a press screw separator 1 will be explained in detail with reference to FIGS. Fig. 1 shows the press screw separator 1 in an overall view. FIGS. 2 to 4 show individual detailed views of the press screw separator 1.

1, the press screw separator 1 comprises a press assembly 2, a mixer 3 and a feeder 6 for introducing disinfectant. For the common drive of the press assembly 2 and the mixer 3, an electric motor 4 and a gear 5 is flanged to the press assembly 2. 2 shows a sectional view of the press assembly 2. The press assembly 2 comprises a housing in which a press screw 30 is rotatably mounted. This press screw 30 consists of a worm shaft 8 and a worm spiral 9 wound around the worm shaft 8. The press worm 30 is set in rotation via the electric motor 4 and the gear 5. Around a part of the press screw 30 around a cylindrical bar screen 10 is arranged.

By means of an inlet 7, slurry containing solid and liquid components, in particular manure, is introduced into the press screw separator 1. This pulp is conveyed from left to right by means of the rotating press screw 30 and compressed at the same time. In the area of the screen 10, a solids plug forms around the worm shaft 8 from the pulp. The liquid components are pressed over the wire 10 radially outward and flow through the liquid drain 1 1 from the press screw separator 1 from.

The solid plug forming inside the press assembly 2 is further conveyed to the mixer 3. As shown in Fig. 1, the feeder 6 comprises a tank 12 for disinfectant. On the tank 12 is a metering device 13 with a pump. From this metering device 13, a pipe 15 leads to nozzles 14. These nozzles 14 are arranged on the mixer 3. About these nozzles 14, the disinfectant is applied to the solid. 3 and 4. Fig. 3 shows a flap 16 at the end of the press assembly 2. At this flap 16 flap arms 17 are attached. In turn, weights 18 are arranged on these flap arms 17. The press screw 30 pushes the solid plug against this weighted flap 16. The weights 18 can be moved along the flap arms 17. As a result, the pressure of the flap 16 can be adjusted to the solid plug. Thus, the required back pressure for squeezing the slurry and forming the solid plug is set.

The mixer 3 comprises an open-topped trough 21 and a mixer shaft 20 arranged in the trough 21. The mixer shaft 20 is coaxial via a plug-in coupling 19 the worm shaft 8 flanged. As a result, simultaneously with rotation of the worm shaft 8 by the electric motor 4, the mixer shaft 20 is set in rotation. The plug-in coupling 19 is used for easy attachment and detachment of the mixer 3 to the press assembly 2. The worm shaft 8 protrudes through the flap 16 therethrough. As a result, the flap 16 is recessed arched.

On the mixer shaft 20 a plurality of paddles 22, 23 are arranged for mixing the solid. In this case, a plurality of the paddle 22 is directed in the discharge direction. Another part of the paddle 23 points in the opposite direction and thus supports the mixing process. To fasten the paddles 22, 23, a strip 24 is welded onto the mixer shaft 20. As FIG. 4 shows in detail, the paddles 22, 23 are fastened to clamps 27. These clamps 27 surround the mixer shaft 20 and are prevented by the bar 24 from rotating about the mixer shaft 20.

The front side of the trough 21 is closed by a front plate 25. Inside the front plate 25 is an opening or outlet 28 in the bottom of the trough 21st About this breakthrough or the outlet 28 of the mixed with disinfectant solid from the mixer 3 is discharged. Even before this breakthrough 28 is a weir 29. About this weir 29, the solid must be transported away. As a result, the residence time of the solid in the mixer 3 is regulated. Particularly preferably, the weir 29 is adjustable or different weir plates can be used.

With the help of the flap 16, the flap arms 17 and the weights 18 so the pressure on the solids plug can be adjusted so that a sufficient dry matter of the solid is achieved. With a measuring device 26 between the pressing assembly 2 and the mixer 3, the exit velocity and thus the exiting amount of the plug is determined via a heat source with subsequent temperature sensor, and thus controls the metering device 13 for the supply of the disinfectant onsmittels. In the illustrated embodiment, the direction of rotation of the press screw 30 and the mixer shaft 20, seen on the face plate 25, to be considered counterclockwise. The housing of the mixer is designed as a trough 21 and corresponds in its lower round area about the diameter of the plug. The offset and executed in the majority in the conveying direction Paddel 22 are through the welded bar 24 firmly screwed to the mixer shaft 20. The paddles 22, 23 mix the solid and convey it slowly to the outlet 28. The backward paddles 23 are designed in the opposite direction of conveyance and thus support the mixing. Too fast emptying of the mixer 3 is prevented by the weir 29 arranged at the opening 28. The height of the weir 29 can be changed by screw-on weir plates. The application of the disinfectant via the nozzles 14 takes place in particular at the beginning of the mixer shaft 20, particularly preferably in the first half of the mixer third

LIST OF REFERENCE NUMBERS

1 screw extruder

2 press assembly

 3 mixers

 4 electric motor

 5 gears

 6 feeder

 7 inlet

 8 worm shaft

 9 spiral spiral

 10 sieve

 11 fluid drainage

 12 tank

 13 pump / dosing device 4 nozzles

 5 pipeline

 16 flap

 17 flap arm

 8 weights

 19 plug-in coupling

 20 mixer shaft

 21 trough

 22 forward paddles

23 backward paddles

24 bar

 25 face plate

 26 measuring equipment

 27 clamps

 28 breakthrough / discharge

 29 weir

 30 press screw

Claims

protection claims A press screw separator (1) for separating solid components from the pulp containing solid and liquid components, comprising  a press screw (30) for pressing out the pulp,  - A feeder (6) for introducing disinfectant in the extruded solid, and  - A mixer (3) for mixing the squeezed solid with the disinfectant. 2. screw extruder according to claim 1, characterized in that the mixer (3) with the press screw (30) is mechanically drive-connected. 3. screw extruder according to claim 2, characterized in that the mixer (3) comprises a with the press screw (30) coaxially connected mixer shaft (20). 4. screw extruder according to one of the preceding claims, characterized in that the supply device (6) comprises at least one nozzle (14) for introducing the disinfectant. 5. screw extruder according to one of the preceding claims, characterized in that the supply device (6) comprises a metering device (13) for regulating the introduced amount of disinfectant. 6. screw extruder according to one of the preceding claims, characterized by a measuring device (26) for measuring the exit velocity and / or discharge amount of the solid from the press screw (30). 7. screw extruder according to claims 5 and 6, characterized in that the metering device (13) for regulating the amount of disinfectant onsmittel depending on the exit velocity and / or discharge amount of the solid from the compression screw (30) is formed. Press screw separator according to one of the preceding claims, characterized in that the mixer comprises a trough (21), wherein one end of the trough (21) for discharging the mixed with disinfectant solid is formed. 9. screw extruder according to claim 8, characterized in that I 0 the end in the trough (21) a weir (29) is arranged, wherein the discharge from the  Trough (21) via this weir (29) takes place.