DE3412170A1 - Multi-spindle press - Google Patents

Abstract

In a multi-spindle press, especially for sugar beet comminution, press spindles (2) can be driven in a synchronously rotating manner, with one helical turn (9) of each press spindle (2) engaging into the helical turn (9) of at least two adjacent press spindles (2), forming an engagement region (74). The press spindles (2) are surrounded by a common press casing (1) and have vertical longitudinal axes (3). The press spindles (2) enclose a guiding body (26) with external perforated guiding sheets (59) which in each case bound a gravity channel (61) for pressurised water. Perforated guiding plates (62) which each bound a gravity channel (64) for pressurised water are also provided on the inside of the press casing (1). <IMAGE>

Description

Multi-spindle press

The invention relates to a multi-screw press according to the preamble of claim 1.

In a known multi-screw press of this type (brochure p. 119 T "The Stord double screw press", 1973, from Stord Bartz Industri A / s, Bergen, Norway) two press spindles are arranged horizontally.

The press spindles of this "open" arrangement can only be along one single axial circumferential area cooperate with each other. The construction of the longitudinally divided press jacket is relatively expensive. A comparatively large area and a correspondingly large foundation are required.

The specific throughput related to the total construction effort the press is relatively small.

The invention is based on the object of the structural effort and to reduce the footprint and the specific throughput at low higher To bridge the dry matter of the pressed material.

This task is particularly due to the characteristic features of claim 1 solved. Preferably, the spindle body is hollow and perforated for formed inner pressurized water drainage. Usually the multi-screw press works continuous and the worm gear of each press spindle is not interrupted, what means that no hold-ups extend inward from the press jacket. the The interlocking worm flights take on the function of the hold-ups, wherein the press spindles are preferably driven to rotate in the same direction of rotation are, the interlocking snow passages move in opposite directions. Manufacturing technology It is particularly favorable if each worm thread has a circular cylindrical envelope surface Are defined. The pitch of each screw thread can be, for. B. from the inlet side to the Remove the outlet side. With this and the special contour of the spindle body can optimally compensate for the decreasing volume of the by the squeezing off of water Filling goods are taken into account. By the characterizing features of the claim 1 results in a particularly compact and powerful design of the multi-spindle press. The diameter of each press spindle can be relatively small, which in turn a relatively small layer thickness of the material to be pressed can be achieved.

Small layer thicknesses mean, however, favorable short drainage routes in the press cake, so that even at relatively high press spindle speeds can achieve comparatively high dry substances of the pressed material.

The special arrangements of the press spindles according to claims 2, 3 and 4 can be used with similar overall advantages according to the respective application to be selected.

By the drive of the press spindles taking place according to claim 5 above the lower discharge area of the multi-screw press is relieved. Finds, however, according to as claim 5, the drive of the press spindles below takes place, the press jacket is from the Load from the drives relieved. It also stands for the filling of what is to be pressed Guts has a larger free cross-sectional area available on the press head.

According to claim 6, a number of small drives can be used favorably that provides the required drive power overall. In the borderline case a drive can be assigned to each press spindle.

According to claim 7 can be a good filling of the individual press spindles with the product to be extracted.

The features of claim 8 improve and make them more uniform Filling.

The webs according to claim 9 offer the incident material proportionately low resistance, the webs are preferably radially oriented Sheets.

The features of claim 10 lead on the one hand to a stiffening of the entire press housing and, on the other hand, are used to create the operating rooms, through which the press spindles move the material to be pressed.

The features of claim 11 provide for the filling with the to be pressed Well, a particularly large fxLe cross-sectional area. If necessary, can be used for stiffening of the press housing, the upper end of the guide body by webs or the like be fixed relative to the press jacket.

The features of claim 12 allow the filling of the individual To equalize and improve the press spindles with the material to be pressed.

The features of claims 13 and / or 14 offer the press cake The largest possible abutment. The envelope surfaces are preferably circular cylindrical.

According to claim 15, the press cake is a conveniently large drainage surface offered.

The features of claim 16 also serve to ensure the best possible drainage of the press cake.

According to claim 17, the discharge of the pressed material is facilitated and improved.

Further features and advantages of the invention emerge from the following Description of the embodiments shown in the drawings. Show it: Fig. 1 is a longitudinal section through a multi-screw press according to the lines 1-1 in Fig. 2 and 4, but without drives, FIG. 2 shows the sectional view along line 2-2 in FIG. 1, Fig. 3 shows a longitudinal section along the lines 3-3 in Figs. 2 and 4, but without press spindles, FIG. 4 shows the sectional view along line 4-4 in FIG. 1, FIG. 5 shows a longitudinal section through part of the head of another multi-screw press, Fig. 6 is a cross-section by yet another multi-screw press with two different designs of the press jacket, FIG. 7 shows a cross section through a further multi-spindle press with a matrix arrangement of the press spindles and FIG. 8 shows a longitudinal section through another Multi-spindle press with press spindles driven at the bottom.

In the multi-spindle press according to FIG. 1 are within a circular ring-shaped Press jacket 1 housed press spindles 2 of the same type, the longitudinal axes of which 3 on a circle 4 (Fig. 2 and 4) around a vertical longitudinal axis 5 of the multi-spindle press are arranged around.

Each press spindle 2 has one from an inlet side 6 to one Outlet side 7 widening spindle body 8 with an outer, uninterrupted one Screw thread 9, the screw threads 9 of adjacent press spindles according to Fig. 4 interlock. Each worm thread 9 defines a circular cylindrical one Enveloping surface 10. The pitch of each screw flight 9 also decreases from the inlet side 6 to the outlet side 7 down.

Each press spindle 2 is at the bottom with a track journal bearing 11 in one stored in the press shell 1 tightly welded base plate 12. Above the Track journal bearing 11 carries each press spindle 2 on a square 13 four over the base plate 12 of the press jacket 1 stroking clearing blades 14, with which the pressed good or the press cake of a discharge opening 15 in the base plate 12 is pushed.

The discharge openings 15 open into one on the underside of the base plate 12 attached dropout funnel 16, which the pressed goods to an order conveyor 17 leads.

Each spindle body 8 is over the whole area with one in Fig. 1 only indicated Perforation 18 provided and made hollow. Press water penetrates the perforation 18 and runs or drips down inside the spindle body 8, where it passes through the hollow track journal bearing 11 emerges and is caught by a funnel 19 will. Each funnel 19 is via a bend 20 and a flange 21 to one Nozzle 22 of a ring line that drains off the press water and is laid in the press jacket 1 23 connected.

The ring line 23 is connected to the outside of the via a connecting piece 24 Press jacket 1 connected, which releases the press water in the direction of an arrow 25.

The press spindles 2 surround a tubular guide body 26, the is welded tightly below to the base plate 12 and just above the base plate a sealing washer 27, which is also tightly welded in, carries. Below the sealing washer 27 and immediately above the base plate 12 are in the wall of the guide body 26 openings 28 distributed over the circumference are provided. Through these breakthroughs 28 occurs later in connection with FIG. 3 in individual to be descriptive Put press water into the guide body 26 and pass through a central opening 29 in the base plate 12 in a tightly attached to the underside of the base plate 12 Collecting funnel 30. The collecting funnel 30 is through a discharge funnel 1G penetrating Line 31 according to FIG. 3 is connected to the ring line 23.

With the press jacket 1, a head ring 32 is screwed above, the has an opening 33 for each press spindle 2. With a surrounding the opening 33 An inner ring 34 of a slewing ring 35 is screwed onto the flange of the head ring 32. An outer ring 36 of the spherical slewing ring 35 carries an outwardly directed ring gear 37 and, via a head disk 38, the associated press spindle 2. All slewing rings 35 run in a common, annular oil bath 39, which is formed by a ringförmiaes Housing 40 is limited. The housing 40 is at the top by an annular cover 41 locked.

Along a central opening 42 in the head ring 32 is with the Head ring 32 is screwed to a flange ring 43. At the top of the flange 43 is a Filling chute 44 which widens conically downwards for the material to be pressed is welded on tightly. In addition, there are radially extending webs on the inside of the flange ring 43 45 welded on, which is connected at the bottom to an upwardly tapering guide body 46 are. The guide body 46 is welded tightly to the upper end of the guide body 26. Thus, in the exemplary embodiment according to FIG. 1, the flange ring 43 forms the webs 45 and the guide body 45 are components of the filling chute 44 and define an outlet area 47 of the filling chute 44. Through this outlet area 47 are essentially radially outwards the inlet sides 6 of the press spindles 2 with the material to be pressed supplied and filled.

The multi-screw press shown in Fig. 1 can be used, for example, as a so-called Post press can be used. For this purpose, the multi-spindle press is used, for example, for pressed sugar beet pulp that have already been pressed in a prepress. These pressed pulp e.g. have a dry substance (TS) of 22 to 24% by weight. At the exit of the multi-spindle press According to FIG. 1, the pressed pulp then present has around 30% by weight of dry matter. A dry substance of this order of magnitude could also be achieved with known tin screw presses or with the known twin screw presses mentioned at the beginning, however there only at the expense of throughput. The press spindles in these known screw presses would have to rotate more slowly, which means a correspondingly reduced throughput would result. In contrast, the multi-screw press shown in Fig. 1 comes without further ado on dry substances in the range of 30 wt. at a relatively higher level Throughput.

According to FIG. 1, the outlet region 47 of the hopper 44 is from above Inlet areas 48 of the press spindles 2 surround.

The material to be pressed is the filling chute 44 in the direction of an arrow 49 fed by a feed screw 50.

For the sake of simplicity, drives for the press spindles 2 are not shown in FIG shown. These drives are described in connection with FIGS.

Fio, 2 shows that with two adjacent ones of the ring gears 37 an intermediate gear 51 meshes, each of which can be driven in rotation by a separate drive 52. as mentioned above, each intermediate wheel 51 does not have to be driven by such a drive 52 be drivable. The number of drives 52 actually used is determined according to the performance of the individual drive 52 and the total power requirement of the Multi-screw press.

According to FIG. 3, each drive 52 has an electric motor 53 and a Reduction gear 54 on. An output shaft 55 carrying the intermediate gear 51 is rotatably mounted with its free end in the head ring 32. Each drive 52 is screwed to the annular cover 41 by screws 56 and can after Loosen the screws 56 including the associated intermediate gear 51 easily and can be quickly dismantled from the multi-spindle press. Also after loosening screws 57 and 58 of the head ring 32 with the housing 40, the annular cover 41 and all Drives 52 are removed as a unit from the multi-screw press. Let through it the press spindles 2, not shown in Fig. 3 for the sake of simplicity (Fig. 1) easily and quickly remove from the press shell 1 and install in the press shell.

On the outside of the tubular guide body 26, according to FIG. 3 and 4 guide plates 59 substantially V-shaped in cross section are attached which each over the entire axial length of the guide body 26 and in the vicinity the adjacent envelope surfaces 10 (Fig. 1) extend.

Each guide plate 59 is also only partially connected to one in FIG. 3 provided perforation 60 and forms with the guide body 26 a vertical case channel 61 for the discharge of press water. Every fall canal 61 stands via one of the perforations 28 with the space below the sealing disk 27 and as a result, via the line 31 with the ring line 21 and the nozzle 24 in connection.

As FIGS. 3 and 4 also show, are within the press jacket 1 in cross-section substantially V-shaped guide plates 62 attached, which each over the entire axial length of the press spindles 2 (Fig. 1) and in the vicinity the adjacent envelope surfaces 10 (Fig. 1) extend. Each guide plate 62 is with one in Fig. 3 only partially drawn perforation 63 provided and forms with the press shell 1 a vertical fall channel 64 for the Discharge of press water. Each fall channel 64 is through an opening 65 in the base plate 12 and a downpipe 66 are connected to the ring line 23.

The guide plates 59, 62 surround the press spindles 2 as much as possible and thus offer as large a drainage surface as possible for that which is to be extracted Good.

In Fig. 5, the guide body 46 is in a conical upper part 67 and a hollow keaelstumpfförmiaes lower part 68 divided.

The lower part 68 is welded to the tubular guide body 26 and carries a rotary drive 69 in its interior, on its vertical output shaft 70, which is arranged coaxially with the longitudinal axis 5, the upper part 67 is attached. Radial wings 71 extend outward from the upper part 67. The wings 71 drive the goods to be pressed, which have been delivered through the filling chute 44, to the outside the upper inlet area 48 of the press spindles 2. These are in a lower end of the filling chute 44 outlet openings 72 are provided. The defining the outlet openings 72 Legs 73 of the filling chute 44 are at the bottom with the lower part 68 or the upper edge of the guide body 26 welded.

In all the exemplary embodiments, the worm gear 9 engages each press spindle 2 in the worm gear (9) at least two adjacent press spindles 2. Through this essentially elliptical engagement areas 74 arise, of which in Fig. 4 one is indicated by hatching. As the rotating arrows 75 of the press spindles 2 indicate, the worm flights 9 move against one another in each engagement area 74. Through this the material to be pressed is based on the type known per se, with the press jacket connected retainer largely prevented from rotating about the longitudinal axes 3, In In all the exemplary embodiments, the same parts are provided with the same reference numbers.

In the embodiment of the multi-screw press according to FIG the vertical longitudinal axes 3 of the ten press spindles 2 arranged on a rectangle. The press spindles 2 surround a guide body 76, which is essentially rectangular Cross-sectional area and is formed hollow and with projections in each case the vicinity of the adjacent envelope surfaces 10 of the press spindles 2 extends. The guide body 76 has a perforation 77 over its entire circumference and its entire length and encloses a fall channel 78 for that which has penetrated through the perforation 77 Pressed water, which is derived centrally through the line 31 analogous to FIG. 3. Of the Fall channel 78 accepts braced support structure 79 for guide body 76 on.

In the upper left quadrant of FIG. 6 it is indicated that the Press jacket 1 by vertical webs SO at a distance from the guide plates 62 can be held.

The three remaining quadrants of FIG. 6 represent a simpler embodiment insofar as the guide plates 62 are locally welded to the press jacket 1 there are. The other features of the embodiment according to FIG. 6 are the same as those of the previously written examples.

In the embodiment according to FIG. 7, the longitudinal axes 3 are from nine press spindles 2 arranged at the intersection of rows and columns of a matrix. In each case four press spindles 2 surround a guide body 81, which is of essentially square cross-sectional area and is hollow and in as possible close proximity of the adjacent filling surfaces 10 of the press spindles 2 extends.

Each guide body 81 encloses a fall channel 82 for press water, through a perforation 83 over the entire area of the guide body 81 has passed through. Each fall channel 82 is analogous to FIG. 3 through the line 31 drained.

The embodiment according to FIG. 8 is basically the same Structure of the exemplary embodiment according to FIGS. 1 to 4. Allerdinas are shown in FIG. 8 the press spindles 2 driven below. Each press spindle 2 is at the top with a track pin 84 in a bearing bushing 85 of a head ring screwed to the press jacket 1 86 stored. The filling chute 44 ends in this case above the head ring 86 and has a particularly large outlet opening 87, which approximates to the outside extends as far as the longitudinal axes 3 of the press spindles 2. This can be particularly easily achieve a complete filling of the press spindles 2 with the material to be pressed.

For reasons of stability, the guide body 46 can if necessary individual radial webs 88 with the head ring, only indicated by dashed lines in FIG. 8 86 connected.

An intermediate ring 89 is located on the underside of the base plate 12 the inner ring 34 of each slewing ring 35 is screwed on. With the bottom of the Outer ring 36 is screwed to a base plate 90, on the calibration a hollow axis 91 of the associated press spindle 2 is supported. One connected to a cavity of the axle 91 Outlet pipe 92 penetrates housing 40 and opens into funnel 19.

Also in the case of FIG. 8, a discharge funnel could correspond to the Outfeed funnel 17 according to FIG. 1 can be provided. Alternatively, however, in FIG. 8 each failure opening 15 is assigned a chute 93, which the pressed good to the Discharge conveyor 17 passes. In FIG. 8, each drive 52 has a hydraulic motor 94 on. However, electric motors could also be used instead in FIG. 8.

Claims (17)

PATENT CLAIMS 1. Multi-screw press for dewatering fibrous materials and pulping, e.g. beet pulp, the press spindles (2) rotating synchronously are drivable and one extends from an inlet side (6) to an outlet side (7) have widening spindle body (8) with an outer worm thread (9), wherein the worm flights (9) of adjacent press spindles (2) intermesh, and wherein the press spindles (2) are surrounded by a common press jacket (1), thereby characterized in that the longitudinal axes (3) of the press spindles (2) are arranged vertically are, and that the worm thread (9) of each press spindle (2) in the worm thread (9) at least two adjacent press spindles (2) engages. 2. Multi-spindle press according to claim 1, characterized in that the longitudinal axes (3) of the press spindles (2) are arranged on a circle (4). (Fig. 2 and 4.) 3. Multi-spindle press according to claim 1, characterized in that that the longitudinal axes (3) of the press spindles (2) are arranged on a rectangle. (Fig. 6.) 4. Multi-spindle press according to claim 1, characterized in that the Longitudinal axes (3) of the press spindles (2) at the intersection of rows and columns are arranged in a matrix. (Fig. 7.) 5. Multi-screw press according to one of the claims 1 to 4, characterized in that either each press spindle (2) above or each PreBspindel (2) uSsn a ring gear (37) carries, and that with two adjacent Gear rings (37) meshes with an intermediate gear (51). 6. Multi-spindle press according to claim 5, characterized in that at least one of the intermediate gears (51) can be driven in rotation by a drive (52) is. 7. Multi-spindle press according to one of claims 1 to 6, characterized in that that the upper inlet areas (48) of the press spindles (2) have a lower outlet area (47) surrounded by a hopper (44). (Fig. 1, 3 and 5.) 8. Multi-screw press according to claim 7, characterized in that the filling chute (44) below with an upward tapering guide body (46) is provided. 9. Multi-spindle press according to claim 8, characterized in that the guide body (46) with extending over the height of the outlet area (47) Web (45) of the hopper (44) is connected. 10. Multi-spindle press according to one of claims 7 to 9, characterized in that that the press spindles (2) one below the outlet area (47) of the hopper (44) surrounding the adjoining guide body (26). 11. Multi-spindle press according to one of claims 1 to 6, characterized in that that the press spindles (2) at least one guide body (26; 76; 81) and, with upper Inlet areas (48), at least one upwardly tapering guide body (46) surrounded, and that each guide body (46) extends upwards into the region of an outlet opening (87) of a hopper (44) for the material to be pressed. 12. Multi-spindle press according to one of claims 8, 10 or 11, characterized characterized in that an upper part (67) of the guide body which has a radial wing (71) (46) rotatable about a vertical longitudinal axis (5) on a lower part (68) of the guide body (46) is mounted, and that a rotary drive (69) for the upper part (67) in the lower part (68) is arranged. 13. Multi-spindle press according to one of claims 1 to 12, characterized in that that the worm thread (9) of each press spindle (2) defines an envelope surface (10), and that within the press shell (1) at least one guide plate (62) is arranged is that extends over the entire axial length of the press spindles (2) and in the vicinity the adjacent envelope surfaces (10) extends. 14. Multi-spindle press according to one of claims 10 to 13, characterized characterized in that the worm thread (9) of each press spindle (2) has an envelope surface (10) defined, and that outside the guide body (26) at least one guide plate (59) is arranged, which extends over the entire axial length of the guide body (26) and extends in the vicinity of the adjacent envelope surfaces (10). 15. Multi-spindle press according to claim 13 or 14, characterized in that that the at least one guide plate (59) is perforated and with the press jacket (1) and with the guide body (26) fall channels (64,61) for the discharge of press water forms. 16. Multi-spindle press according to one of claims 10 to 15, characterized characterized in that the worm thread (9) of each press spindle (2) has an envelope surface (10) defines that the at least one guide body (76; 81) is hollow and perforated (77; 83) and extends in the vicinity of the adjacent envelope surfaces (10), and that an interior of the guide body (76; 81) has a fall channel (78; 82) for the drainage forms of press water. 17. Multi-spindle press according to one of claims 1 to 16, characterized in that that each press spindle (2) below with a rotating, over a bottom (12) of the press jacket (1) has sweeping blades (14), and that the bottom (12) is below the blades (14) for each press spindle (2) with one opening into a discharge funnel (16) Loss opening (15) is provided for the pressed goods.