FR2492406A1 - CENTRIFUGAL WIPER CONTINUOUSLY EQUIPPED WITH A MILLING DEVICE - Google Patents

Abstract

CONTINUOUSLY OPERATING CENTRIFUGAL SPINNER FOR SEPARATING THE SUGAR CRYSTALS FROM THEIR MOTHER LIQUEUR CONSTITUTED BY A TANK 10 IN WHICH IS MOUNTED A ROTATING BASKET 14 WITH A VERTICAL AXIS, IN THE FORM OF A TRUNK OF INVERTED CONE AND EQUIPPED WITH A SIEVE 16. TO ALLOW THE PACKAGING OF THE CRYSTALS IN THE WRINKLE, THIS IS EQUIPPED WITH NOZZLES OR SPRINKLERS 32, 32 WHICH SPRAY A SUGAR JUICE ON THE TABLE OF CRYSTALS EXPULTED FROM BASKET 14 AND INCLUDES A PLAN RING 36, OF LOW WIDTH, FIXED INTERNALLY ON THE WALL OF THE TANK 10, SLIGHTLY BELOW THE HORIZONTAL PLANE, Leaning ON THE UPPER EDGE OF THE BASKET 14.

Description

The present invention relates to centrifugal dryers

  continuous running machines consisting of a basket with a vertical axis

  tical, inverted truncated cone shape, equipped with a sieve

  through which the liquid phase of the test product is filtered

  while the solid phase is expelled by force

  centrifuge at the end of large diameter of the basket and pro-

  thrown in a closed tank where is housed the basket.

  Spinners of this type are used in sugar mills to separate the sugar crystals from the cooked masses. In some cases, it is necessary to mix the crystals with a juice

  saturated just after spinning. This operation, called

  pasture requires a container with stirring devices

  and a device, such as an auger, for transmitting

  bring the sugar crystals from the wringer to the container.

  To simplify the installation, it was proposed to carry out this

  operation directly in the wringer and different

  yens have been used for this purpose.

  In general, nozzles or spray bars are used to project the mashing juice onto

  crystals as they exit the basket and an annular collector

  re on which the mixture of crystals and juice is projected by centrifugal force. These collectors, who may have

  a circular, parabolic or frustoconical profile, are con-

  to retain a certain volume of this mixture and avoid

  as well as the crystals forcefully strike the surface

  that of the collector where they could break. Their profile must therefore be suitably studied according to the product treated so that they fulfill this function correctly.

  This complicates the design and manufacture of the esso-

reuse.

  The present invention achieves the desired goal.

  by much simpler means.

  The wringer which is the subject of the invention is characterized in

  it has a plane ring of small radial width

  the internally fixed on the wall of the tank slightly

  below the horizontal plane resting on the upper edge

in the basket.

  It has already been proposed, in a centrifugal wringer, to attach to the wall of the tank, below the outlet edge.

  of the basket, a retaining ring on which a

  more product wrung out. This provision is intended, in this case, to protect the wall of the tank and reduce wear due to abrasion by dewatered products.

  The invention consists in reality in the application of this

  provision to a pasting spinner to prevent breakage

  crystals expelled from the basket and ensure a proper

  crystals and mashing juice.

  The nozzles or ramps that direct the jets of juice on the sheet of crystals expelled from the basket can be arranged

  inside the basket, in the vicinity of the horizontal plane

  the jets emitted by these nozzles or ramps being directed towards the edge of the basket. Alternatively, the nozzles or ramps may be arranged around a cylindrical skirt placed above the upper edge of the basket so that the mashing juice is projected onto this skirt, flows to its lower edge and falls on the sheet of crystals expelled from the basket through the circular slot formed between the lower edge of the skirt and the

top edge of the basket.

  The magma formed by the mixture of crystals and

  juice is collected in an annular trough, the wall of which is

  is formed by the wall of the tank and whose bottom has several outlets and presents, from one outlet to the next and moving in the direction

  rotation of the basket, a downward slopepEMo helical.

  In addition to its simplicity, the solution of the invention

  to minimize the volume limited by the skirt, the neckline

  vial of the tank, the wall of the tank, the inner wall

  and the bottom of the magma receiving trough and, therefore,

  to intensify in this volume the breakdown due to the

  rotation of the basket and the mixing of the magma that it causes.

  In the known solutions, the existence of the collector, whose height above the upper edge of the basket is not

  negligible, limits the reduction of this volume.

  In a mashing wringer, it is necessary, in order to control the quality of the wringing, to take out, when running,

  samples of sugar crystals. This sampling

  ge is performed by means of a pot that is introduced into the tank through an orifice provided in the lid of the tank

  and normally closed; this pot has a lateral opening

  that is placed in front of the basket to collect

  sugar crystals expelled from the basket. During this operation

  tion, it is necessary to cut off the power of the

  pe or nozzles throwing the pasting juice on the crystals, when they leave the basket. We see that it occurs then

  bottlenecks on the ring and in the trough.

  To remedy this drawback, the wringer of

  vention is equipped with an auxiliary garden irrigation

  in the upper part of the tank, near its wall,

  and whose jets are directed towards the ring and a system

  of valves to feed this ramp in juice

  as soon as the feeding of the nozzles or

  main rosé is cut off and vice versa.

  Other features of the invention will become apparent

  upon reading the description that follows and refers to

  accompanying drawings that show, as a non-standard example

  one embodiment of the invention and in which: Figure 1 is a section through a vertical plane of a centrifugal wringer according to the invention;

  FIG. 2 is a top view, on a smaller scale,

  the, from the bottom of the trough of reception of the magma;

  FIG. 3 is a developed cross-sectional view of the

  of the magma reception showing the profile of the bottom of the

ge; and

  FIG. 4 is a sectional view of the wringer

  auxiliary ramp for sampling sugar. The wringer shown in FIG.

  tank 10 supporting the pivot 12 on which is rotatably mounted

  a basket 14 in the form of inverted truncated cone equipped with a sieve 16. The product to be dewatered is introduced through a pipe 18 into a distribution pot 20 fixed on the hub of the basket. This pot has the role of bringing the product to wring 249240d -4- to the bottom of the basket and distribute it evenly over

all its periphery.

  Under the effect of the centrifugal force, the product with

  sorer which is constituted by a mass-cooked, slides on the sieve 16 to the top edge of the basket. The liquid phase of the product to be filtered out through the sieve and flows

  in canals entered the wall of the basket and the

  put up to their upper end o are provided openings opening into an annular chamber 22 surrounding the basket and defined by circular partitions 24 and

26 and a bottom 28.

  The solid particles of the product to be dewatered, which consist of sugar crystals, are expelled by centrifugal force when they reach the upper edge.

  basket and are projected on the wall of the tank.

  When they leave the basket, the sugar crystals are

  rosés with a sweet juice projected by a circular ramp 32

  arranged inside the basket, at the level of the upper edge

  in the basket. The jets of this ramp are tangent to

top edge of the basket.

  Alternatively, the sweetening juice may be

  projected by means of a circular watering boom 32 ',

  shown in dashed lines in Figure 1, on the outer surface of

  a cylindrical skirt 34 attached to the lid 35 of the tank, above the rim of the basket; the bottom edge of

  this skirt is spaced from the upper edge of the basket of

  to provide a circular slot for the passage of

  Rates expelled from the basket. In this case, the sweet juice flows by gravity along the skirt, to its lower edge,

  and falls on the sheet of crystals coming out of the basket.

  A flat ring 36, of small width, is fixed on the wall of the tank slightly below the horizontal plane resting on the upper edge of the basket. This ring holds

  a certain volume of the magma constituted by the mixture of crys-

  rate and juice. It is found that it is formed on the ring 36

  a coil of magma 38 that turns on itself, as

  the arrows in Figure 1, and in the sense of

  tation of the basket under the combined effects of

  -5- tion and the impact of the crystals. This bead which is placed on the trajectory of the crystals expelled from the basket prevents them from coming violently against the wall of the tank and

prevents their deterioration.

  The diameter of the coil 38 is substantially greater

  to the width of the ring 36. In a particular embodiment

  ring 36 has a width of about 40 mm and is located 5 mm below the horizontal plane resting on

the edge of the basket.

  The axial distance between the ring and the edge of the

  deny may vary but must always be weak and will be

  advantageously less than 10 mm.

  The magma constituting the boudin 38 is renewed

  MENT; after having spent some time on the

  36, it is discharged by gravity and collected in an annular trough 40 formed by the wall of the tank 10 and an extension of the circular partition 24. The bottom of this trough has two outlet orifices 42, diametrically opposed, and the bottom of the trough is formed of two portions of helix or ring 44 inclined from top to bottom, in the direction of rotation of the basket 14, the orifices 42 being

  at the bottom two points of the bottom (Figures 2 and 3). The trough

  would have more than two outlet ports which would

  particular effect of increasing the slope of the bottom for

the same height of the trough.

  Although this is not highlighted on the

  1, the invention makes it possible to reduce the volume o circulates the air rotated by the basket 14 and, consequently,

  to intensify the mixing of the magma in the pudding, in

  proclaiming the lid of the bowl of the upper edge of the pa-

  deny. FIG. 4 shows a wringer identical to that of FIG. 1 equipped with an auxiliary circular ramp

  placed under the lid and near the wall of the tank.

  The number and the diameter of the orifices of this ramp are the same as those of the ramp 32, but their arrangement is such that the jets are directed towards the ring 36,

  vertically or slightly obliquely, and more precisely

-6-

  towards the center of the magma pudding. The ramp is

  linked to the feed pipe juice supply 52, through a valve 54, and a valve 56 can isolate

the ramp 32 of this pipe.

  This arrangement makes it possible to take

  samples of sugar crystals ensuring permanent

  this wetting crystals so as not to disturb the function

machine.

  The sampling process is as follows:

  me the valve 54 and simultaneously opens the valve 56; of

  In this way, the distribution of the pasting juice is transferred

  From the ramp 32 to the ramp 50. A pot is then introduced into the tank through an orifice of the lid. This pot conforms to a lateral opening that is placed in front of the

  edge of the basket to collect ejected sugar crystals

  tees of the basket. After a few dozens of seconds, the pot

  removed from the tank and the hole is closed by a cover

  key. The valve 56 is then closed and the valve 54 is opened to cut off the supply of the ramp 50 and supply the ramp 32. The valves 54 and 56 could obviously be

  replaced by a three-way valve.

  It is understood that the invention is not limited

  the described embodiment and that many modifications

  can be made by means of

  equivalent techniques without departing from its scope.

-7 -

Claims (5)

R E V E N D I C A T I 0 N S   1. Centrifugal centrifugal spinning machine for separating sugar crystals from their mother liquor, consisting of a tank in which is mounted a rotary basket with a vertical axis, in the form of an inverted truncated cone and equipped with a sieve. through which the mother liquor filters   while the crystals are expelled by the central force   trifuge at the top end of the basket, and   both a device for the mashing of dewatered crystals   including nozzles or watering ramps that pro-   throw a sweet juice on the sheet of crystals expelled from the basket, characterized in that it further comprises   a flat ring (36), of small width, internally fixed   on the wall of the tank (10), slightly above   under the horizontal plane resting on the upper edge of the basket (14).   2. Centrifugal wringer according to claim 1, characterized   in that the nozzles or the spray bars (32)   disposed within the basket (14), in the vicinity   ge of the horizontal plane resting on the upper edge of the latter, and the jets emitted by these nozzles or ramps are tangent to the edge of the basket.   Centrifugal wringer according to claim 1, characterized   in that the nozzles or spray bars (32 ') are arranged around a skirt (34) placed above   the upper edge of the basket (14) and whose lower edge   is spaced from the edge of the basket, the jets emitted by   these nozzles or ramps being directed towards the skirt.   4. Centrifugal wringer according to claim 1, 2 or 3, characterized in that it comprises an annular trough (40) for receiving the magma formed by the mixture of crystals and juice, the bottom (44) is provided of several outlets (42) -and, when moving from one outlet to the next in the direction of rotation of the basket, a flat downward slope or helical.   5. Centrifugal wringer according to claim 1, 2, 3 or 4, characterized in that it is equipped with a ramp - 8 -   auxiliary watering device (50) placed in the upper part   tank, near its wall, and whose jets are directed towards said ring (36) and a system of valves (54, 56) for feeding this ramp in mashing juice as soon as the nozzle supply and   Main ramps (32) are cut off and vice versa.