Patent Publication Number: US-2022234836-A1

Title: Device for transporting solids

Description:
TECHNICAL FIELD 
     The present invention relates to a device for transporting solids. More in particular, the present invention can be advantageously but not exclusively applied in the separation treatment of solids from waste fluids, to which the following description will make explicit reference but without reducing the generality of the invention. 
     PRIOR ART 
     As is known, in the field of treating waste waters, devices are used that are adapted to transport the solid fraction separate from the liquid fraction. 
     Such devices generally comprise a support frame provided with an inlet mouth immersed in a collection channel into which the water to be treated is conveyed, an outlet mouth and an auger conveyor adapted to collect the solid fraction for discharging it into a relevant container placed at the outlet mouth. 
     The auger conveyor is activated by a motor generally placed downstream of the auger, in the advancement direction imposed by the rotation of the auger, and connected thereto through a central shaft coaxially associated with the head of the auger, i.e. that extends axially beyond the downstream end of the auger. 
     With such transport devices of the known type it is often necessary to transport fibrous material, e.g. long fibre material, which sometimes implies the clogging of the unit or the creation of blocks/tangles around the downstream end portion of the auger, which prevent the natural exit of material from the outlet mouth. To prevent or solve such clogging, frequent maintenance interventions are required, with unquestionable disadvantages in terms of the efficiency of the device itself. 
     An object of the present invention is to overcome the mentioned drawbacks of the prior art, within the context of a simple and rational solution and at a contained cost. 
     Such purposes are accomplished by the characteristics of the invention given in the independent claim. The dependent claims outline preferred and/or particularly advantageous aspects of the invention. 
     DISCLOSURE OF THE INVENTION 
     The invention, in particular, makes available a device for transporting solids that comprises:
         a support frame,   an auger connected to the support frame rotatably about an axis of rotation,   a motor unit configured to activate in rotation the auger that comprises an output shaft being rotatable about an axis of revolution,       

     wherein the axis of revolution of the output shaft is parallel and eccentric to the axis of rotation of the auger. 
     Thanks to such solution, the device according to the invention solves the problems encountered in devices for transporting solids of the known type, improving the efficiency thereof, allowing a reduction in maintenance interventions with respect to devices of the known type. 
     In particular, the motor unit according to the invention is such as to leave free (without transmission shafts and/or other motion transmission means) the zone axially located downstream (in the immediate vicinity) of the auger, allowing all types of material (even fibrous) not to get tangled/twisted and fall freely towards the outlet mouth. 
     An aspect of the invention with the same purposes outlined above can further envisage that the device comprises a transmission unit configured to connect the output shaft and the auger. 
     Advantageously, the transmission unit can comprise a pinion fitted onto the output shaft and a toothed crown rigidly fixed to the auger. 
     Thanks to such solution, the device has a safe and precise transmission in the event of speed variations or multiplications of torque, with generally high performance, as well as high resistance to wear and, therefore, high durability. 
     Again, another aspect of the invention envisages that the toothed crown can be fixed coaxially to the outside of the auger. 
     Thanks to such aspect, the transmission of the motion to the auger takes place directly on the outer surface thereof, allowing the central area of the auger to be left free or only partially occupied. 
     Advantageously, for the purposes illustrated above, the toothed crown can be fixed proximal to or at a downstream end of the auger in an advancement direction imposed by the rotation of the auger on the solids transported thereby. 
     Another aspect of the invention envisages that the device can comprise a connection flange configured to mutually fix the toothed crown and the auger. 
     Thanks to such solution the motor unit and/or the transmission unit are arranged in an optimal area of the device with respect to the use thereof. 
     In this way, effective and functional mutual fixing between the toothed crown and the auger is possible, the latter being reinforced in the connection area by the connection flange and, at the same time, being effectively activated in rotation. 
     Advantageously, the connection flange can comprise a connection tube. 
     Preferably, the connection tube can be coaxially fitted onto the auger. 
     Yet, the connection tube can be fixed to the auger by means of a first connection, for example a first threaded connection or (preferably) a first welded connection, and the connection tube is provided with at least one crest projecting in the radial direction to the outside of the connection tube, wherein the toothed crown is fixed to the crest by means of a second connection, for example a second threaded connection. 
     Thanks to this, it is possible to have effective and functional mutual fixing between the toothed crown and the connection flange, therefore between the toothed crown and the auger. 
     A further aspect of the invention envisages that the first threaded connection (where present) can comprise a plurality of first radial screws and/or the second threaded connection can comprise a plurality of second axial screws. 
     Thanks to this solution, it is possible to make the toothed crown and the auger integral with each other, in a releasable way, through only one connection element interposed between them. 
     For example, at least one connection block may be interposed between the connection tube (i.e. the connection flange) and the auger, wherein the connection block is fixed to the auger by means of a further connection, in particular a further threaded connection with screwing axis parallel to the axis of rotation of the auger, i.e. for example by means of a plurality of first axial screws. 
     Yet, according to an advantageous aspect of the invention, the connection tube can have an axial length less than or equal to a pitch of a spiral of the auger, preferably less than or equal to half the pitch of a spiral of the auger. 
     Thanks to this solution, the correct (and constant) axial advancement of the solid phase transported by the auger towards the axial downstream end thereof is made possible, preventing and/or limiting as much as possible the risk of clogging of (any) transported solid fraction (at the stretch affected by the connection tube) which would generate malfunctions or need for maintenance and/or restoration interventions of the discharge flow. 
     A further aspect of the invention envisages that the device can comprise a
         compartment in which the transmission unit is contained; and   sealing gaskets interposed between a delimiting wall of the compartment and the connection flange.       

     In this way the protection of the part of the device affected by the transmission of the motion and the watertight seal of the transmission unit, i.e. the environment in which the motor unit and the transmission unit are contained, is kept separate from the environment in which the auger is contained, hence preventing contamination between the two environments. 
     Yet another aspect of the invention, with the same aims disclosed above, envisages that the motor unit can be comprised by a motor provided with a motor drive shaft and a reducer provided with an input shaft, connected to the drive shaft of the motor, and the output shaft of the motor unit. 
     According to another aspect of the invention, the device can comprise a final compacting screen located at a terminal stretch of the auger provided with an axial downstream end thereof, in the advancement direction of the solids imparted by the rotation of the auger by the motor unit. 
     The final compacting screen is configured to compact the solid fraction before it is discharged (and/or reduce the amount of liquid fraction contained therein), allowing to separate the solid fraction from the liquid fraction more effectively and to squeeze the aforesaid solid fraction more. 
     Preferably, to make its function more efficient, the final compacting screen can be rigidly fixed to the support frame, i.e. the auger is in relative motion with respect to the final compacting screen (which remains fixed). 
     Another aspect of the invention makes available a transport unit for transporting solids comprising a collection channel, and a device as described above, wherein at least one end of the auger is inserted in the channel. 
     This solution allows the aims described above for the solid transport device to be achieved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further features and advantages of the invention will be more apparent after reading the following description provided by way of a non-limiting example, with the aid of the accompanying drawings. 
         FIG. 1  is an axonometric view of a separation device provided with the solid transport device according to the invention. 
         FIG. 2  is a side view of the device of  FIG. 1  positioned in a collection channel. 
         FIG. 3  is an enlargement of the detail III of  FIG. 2 . 
         FIG. 4  is the view of  FIG. 3  in which the outer casing has been removed to improve the visibility of the internal components. 
         FIG. 5  is a plan view of  FIG. 1 . 
         FIG. 6  is a sectional view along the plane of trace VI-VI of  FIG. 5 . 
         FIG. 7  is an enlargement of the detail VII of  FIG. 6 . 
         FIG. 8  is an enlargement of the detail VIII of  FIG. 7 . 
         FIG. 9  is an enlargement of the detail VII of  FIG. 6 , according to a further embodiment. 
         FIG. 10  is the enlargement of the detail X of  FIG. 9 . 
     
    
    
     BEST WAY TO ACTUATE THE INVENTION 
     With particular reference to such figures,  10  indicates overall a device for transporting solids, e.g. in the separation treatment of solids from waste fluids. 
     More in particular, the device  10  may be a separation device of the solid fraction, in particular of the less fine solid fraction, known as the screening fraction, from waste fluids, e.g. from refluent waters. 
     In practice, the refluent waters have a solid fraction dispersed and/or in suspension in the liquid fraction, e.g. in water, to be recovered. 
     The fluid to be separated is generally conveyed into a relevant collection channel  1  (which may be part of the device  10  or already installed in situ according to the circumstances), e.g. long and narrow, at a first longitudinal end  1   a  of which (e.g. through an inlet not shown) the fluid containing the solid fraction to be separated from the liquid fraction is conferred and at whose second end (provided with an outlet not shown) the separated liquid fraction is collected, to be conferred for example to other treatment plants for the fine separation of the sludge still dispersed therein. The collection channel  1  is depicted in  FIG. 2 . 
     The device  10  comprises a support frame  11  adapted to be fixed inside the collection channel  1 , e.g. in an intermediate area between the first end  1   a  and the second end  1   b.    
     The support frame  11 , for example, comprises a box-like body  12 , e.g. provided with a first wall  120  e.g. provided with a through opening defining an inlet mouth  121 , e.g. substantially circular shaped. 
     In practice, the inlet mouth  121  of the support frame  11  is intended to be arranged, at least partially, inside the collection channel  1 . 
     Generally, the level of the fluid to be separated reaches, during use, about  1 / 2  of the height of the inlet mouth  121 . 
     The first wall  120 , for example, has a shape that is substantially conjugated to the internal shape of the collection channel  1 , so as to rest (substantially sealingly) on the bottom and on the side walls thereof, so as to divide the internal volume of the collection channel  1  into two environments communicating with each other only through the inlet mouth  121 . 
     In practice, the two environments into which the collection channel  1  is divided by the device  10  are a first environment communicating with the inlet of the fluid to be separated, in which the fluid itself to be separated is contained and a second environment communicating with the outlet of the liquid fraction separated from the separation fluid and in which only the liquid fraction of the fluid itself is contained. 
     The box-like body  12  comprises a second wall  122 , opposing the first wall and parallel thereto, joined to the first wall  120  through a plurality of uprights  123 , adapted to conform the box-like body  12  substantially like a cage. 
     The second wall  122  has a through hole  124 , e.g. substantially circular shaped, substantially aligned and coaxial with the through opening  121  of the first wall  120 . 
     In practice, the first environment into which the internal volume of the collection channel  1  is divided is in communication with the second environment through the open gaps between the various uprights  123 , which gaps define a first outlet mouth  125  of the device  10  from which the liquid fraction exits that is separated from the fluid being treated. 
     The first wall  120  and the second wall  122  have a substantially square shape (square in the example), there are, for example, four uprights  123  and they connect for example the four vertices of the opposing walls  120 , 122 , leaving four open walls defined. For example, it is possible to provide for the box-like body  12  to have one or more infill slabs (not shown) adapted to close at least one of the gaps defined between the uprights  123 . 
     In particular, it is possible to provide for the box-like body  12  to have three infill slabs, each fixed to a pair of contiguous uprights  123  and adapted respectively to close one of the gaps, e.g. the upper gap and the side gaps of the box-like body  12 , leaving open only the lower gap that defines said first outlet mouth  125 . 
     The device  10  further comprises a channel  13 , which is fixed, for example, to the support frame  11  (regardless of the shape thereof). 
     The channel  13  for example is inserted into the inlet mouth  121  (e.g. with high radial clearance) and the through hole  124  (e.g. substantially to fit). 
     In particular, the channel  13  comprises a first stretch  131  defined internally to the box-like body  12 , e.g. axially contained between the first wall  120  and the second wall  122 . 
     Furthermore, the channel  13  comprises a second stretch  132  defined substantially straddling the first wall  120  of the box-like body  12 , i.e. inserted into the inlet mouth  121 , so that it can for example project externally to the box-like body  12  of a reduced axial segment. 
     The channel  13  comprises a third stretch  133 , defined externally to the box-like body  12 , in practice extending the first stretch  131  on the opposite side with respect to the second stretch  132 . 
     The third stretch  133  has a distinctly greater length than the second stretch  132  and the latter has a lower length than the length of the first stretch  131 . 
     The channel  13  comprises an access portion  1341 , 1342  and a second outlet mouth  135  intended to be placed outside the collection channel  1 . 
     The access portion  1341 ,  1342  is in practice defined at at least one from between the first stretch  131  and the second stretch  132  of the channel  13 . 
     In the example, the channel  13  comprises a first access portion  1341  defined at the first stretch  131  of the channel  13  and a second access portion  1342  defined at the second stretch  132  of the channel  13 , e.g. axially separate from each other. 
     In practice, the first stretch  131  and the second stretch  132  of the channel  13  are open at the top, i.e. they have a substantially U-shaped (substantially circular shaped) cross section. 
     The access portion  1341 ,  1342  (i.e. the first access portion  1341  and the second access portion  1342 , respectively) is defined by the open section (radial and facing upwards) of the channel  13 , at the first stretch  131  and the second stretch  132 . 
     The second outlet mouth  135  is defined at the third stretch  133  of the channel  13 , e.g. in proximity to the distal end at the box-like body  12  thereof. 
     In the example, the second outlet mouth  135  is defined by an axial opening made at the end of the third stretch  133  of the channel  13  opposite the axial end of the channel  13  proximal to the outlet mouth  125 . 
     At least one from the first stretch  131  and the second stretch  132  of the channel  13  comprises drainage holes  138 , adapted to allow the drainage of the possible liquid fraction collected in the channel  13 . 
     The drainage holes  138  are for example defined at the bottom of the first stretch  131  and/or of the second stretch  132 . 
     In the example, both the first stretch  131  and the second stretch  132  are provided with respective drainage holes  138 . 
     The channel  13  has a substantially rectilinear longitudinal axis. 
     Although the channel  13  is illustrated as a set of stretches  131 ,  132 ,  133  it could be a channel made as a single body, in which the stretches may be only functionally distinct. Furthermore, the channel  13  preferably has a longitudinal axis that is inclined with respect to the horizontal, so that the second outlet mouth  135  is at a higher level with respect to the access portion  1341 ,  1342 . 
     For example, the longitudinal axis of the channel  13  is inclined by an angle substantially equal to (or around) 35° with respect to the horizontal. 
     In the example, the channel  13  is fixed to the box-like body  12 , so that the longitudinal axis of the channel  13  is substantially orthogonal to the plane defined by one (both in the example) from between the first wall  120  and the second wall  122 . 
     The box-like body  12  is therefore fixed to the inside of the collection channel  1 , so that the longitudinal axis of the channel  13  is inclined with respect to the horizontal and, for example, substantially aligned in the plan view with the longitudinal axis of the collection channel  1  itself (that joins the first end  1   a  to the second end  1   b ). 
     In the example, the axial upstream end of the channel  13 , placed in proximity to the inlet mouth  121  and, therefore, of the collection channel  1 , is closed by a flange  137  fixed, for example bolted, to the channel itself. 
     However, it is not excluded that the axial upstream end of the channel  13 , placed in proximity to the inlet mouth  121  and, therefore, to the collection channel  1 , is open. 
     The device  10  comprises at least one auger  15  rotatably associated with the inside of the channel  13 . 
     The auger  15  extends longitudinally about an axis of rotation A, e.g. coaxial to the cylindrical cavity of the channel  13 . 
     Preferably, the auger  15  is adapted to connect the access portion  1341 , 1342  of the channel  13  with the second outlet mouth  135  thereof for transporting the solid fraction, which accumulates at the access portion  1341 , 1342 , from the access portion itself towards the second outlet mouth  135 . 
     The auger  15  is for example coaxially inserted into the channel  13 , so as to longitudinally cross the channel itself, for the entire length thereof. 
     Preferably, the auger  15  extends longitudinally from the access portion  1341 ,  1342  to the second outlet mouth  135 . 
     For example, the auger extends longitudinally (along the axis of rotation A thereof) from an axial upstream end (in the advancement direction imposed on the residual solids transported by the auger  15  by the screwing rotation of the auger  15  itself) to an opposing axial downstream end (in the advancement direction imposed on the residual solids transported by the auger  15  by the screwing rotation of the auger  15  itself). 
     Preferably, the axial downstream end of the auger  15  exits axially from the second outlet mouth  135  for a (limited) axial stretch projecting to the outside of the channel  13 . 
     For example, the projecting axial stretch comprises one or two end spirals of the auger  15 . 
     The auger  15  is for example an auger without a central shaft, in practice it comprises only one helix (or more) delimiting a substantially cylindrical central (empty) cavity. 
     However, it is not excluded that the auger  15  can have a full length central shaft, as known to a person skilled in the art. 
     The auger  15 , although being a monolithic single body, can ideally be divided into more portions, based on the axial position and the positioning thereof in the channel  13 . 
     In practice, the auger  15  has a first portion  151  (e.g. intermediate) placed inside the first stretch  131  of the channel  13 . 
     The first portion  151  of the auger  15  in practice has an equal length to the length of the first stretch  131  of the channel  13 . 
     Furthermore, the auger  15  comprises a second portion  152  (e.g. proximal to the axial upstream end of the auger itself) placed inside the second stretch  132  of the channel  13 . 
     The second portion  152  of the auger  15  in practice has an equal length to the length of the second stretch  132  of the channel  13 . 
     At the first portion  151  and/or the second portion  152  the auger  15  can comprise radial brushes, e.g. mounted in sectors and bolted or however fixed removably to the auger  15 . 
     In practice, the radial brushes are adapted to radially project the spiral of the auger  15 , in practice by entering into brushing contact with the bottom (of the first stretch  131  and/or the second stretch  132 ) of the channel  13 . 
     The auger  15  then comprises a third portion  153  (e.g. proximal to the axial downstream end of the auger itself), placed on the opposite side of the second portion  152  with respect to the first portion  151 , which is placed inside the third stretch  133  of the channel  13 . 
     The third portion  153  of the auger  15  in practice has an equal (or slightly higher, as specified above) length to the length of the third stretch  133  of the channel  13 . 
     The auger  15  has, for example, a variable section along the longitudinal axis thereof. 
     In the example, the first portion  151  and/or the second portion  152  have a smaller diameter (e.g. outer diameter) than the (outer) diameter of the third portion  153 . 
     In the example shown, the auger  15  is implemented by an internal helix that extends along the entire length (first, second and third portion  151 , 152 , 153 ) of the auger  15  that is fixed (or however integral) to an external helix that extends along the third stretch only  153 . 
     In practice, the first portion  151  and the second portion  152  of the auger  15  are inserted with abundant radial clearance into the respective first stretch  131  and second stretch  132  of the channel  13 . 
     The third portion  153  of the auger  15  is inserted with reduced radial clearance into the third stretch  133  of the channel  13 . 
     The device  10  comprises a motor unit  30  configured to activate the auger  15  in rotation. In particular, the motor unit  30  is placed at or in proximity to the axial downstream end of the auger  15  and connected thereto to draw the auger  15  in rotation about the axis of rotation A thereof. 
     The motor unit  30  comprises a motor  31 , e.g. an electric motor, which is provided with a drive shaft  310  being rotatable about a central axis of revolution thereof, which is in the example parallel and eccentric to the axis of rotation A of the auger  15 . 
     The motor unit  30  further comprises a reducer  32 , which is in turn provided with an input shaft  320  (e.g. hollow), which is coaxially (directly) coupled rigidly to (for example fitted onto) the drive shaft  310  of the motor  31 , and an output shaft  321 . 
     The output shaft  321  is rotatable about a central axis of revolution B thereof which is parallel and eccentric with respect to the central axis of revolution of the input shaft  320  (and therefore of the drive shaft  310 ). 
     Furthermore, the axis of revolution B of the output shaft  321  is parallel and eccentric to the axis of rotation A of the auger  15 . 
     The motor unit  30  is preferably (a gear motor) comprised of the motor  30  and the gear motor  32  and, the output shaft  321  of the reducer  32  is the (only) output shaft of the motor unit  30  (as a whole). 
     It is not excluded however that the motor unit  30  may be comprised only of the motor  30 , in which case the drive shaft  310  constitutes only the output shaft of the motor unit  30  (as a whole). 
     For example, the motor unit  30  is arranged to the side of the axial downstream end of the auger  15 , so that the output shaft  321  is substantially flanked and parallel to the axial projecting stretch of the auger  15  (which projects axially outside the axial downstream end of the channel  13 ), e.g. at a non-null radial distance therefrom. 
     The device  10  further comprises a transmission unit  40  which is configured to transmit the rotational motion from the motor unit  30 , i.e. from the output shaft  321  thereof, to the auger  15 . 
     In practice, the transmission unit  40  connects the output shaft  321  to the auger  15 , preferably to the axial projecting stretch of the auger  15 . 
     The transmission unit  40  comprises a pinion  41 , which is (directly) rigidly connected coaxially to the output shaft  321  of the motor unit  30 , i.e. fitted onto the output shaft  321  itself. 
     In detail, the pinion  41  is rotatable about a central axis thereof coinciding with the axis of revolution B of the output shaft  321  (drawn in rotation by the latter). 
     Again, the transmission unit  40  comprises a toothed crown  42  which is configured to mesh with the pinion  41 . 
     The toothed crown  42  is (directly or indirectly) rigidly connected coaxially to the auger  15 , as will be better described below. 
     In detail, the toothed crown  42  is rotatable about a central axis thereof coinciding with the axis of rotation A of the auger  15  (so as to be able to draw the latter in motion). 
     In the example shown, the pinion  41  (directly) meshes with the toothed crown  42 , i.e. the pinion  41  has a plurality of teeth that mesh with the teeth of the toothed crown  42 . Furthermore, the toothed crown  42  has a greater number of teeth (and diameter) than the number of teeth (and diameter) of the pinion  41 . 
     In this way, the transmission unit  40  operates a (further) reduction of the rotation speed of the auger  15  (with respect to that operated by the reducer  32 ). 
     It is not excluded however that the pinion  41  may directly mesh with the toothed crown  42 , i.e. for example that one or more intermediate toothed wheels are interposed between the pinion  41  and the toothed wheel  42  and/or that a transmission member, e.g. chain operated, is interposed between the pinion  41  and the toothed wheel  42  for the transmission of the rotational motion of the pinion  41  to the toothed wheel  42 . 
     Furthermore, it is possible to provide for the transmission unit  40  to have a pair of pulleys connected to one another by a drive belt in the place of the pinion  41  and the toothed crown  42 . 
     The toothed crown  42  has an inner cylindrical cavity, coaxial with the central axis thereof, which is inserted (with radial clearance) coaxially on the auger  15 , i.e. on the projecting axial stretch thereof. 
     For example, the toothed crown  42  is inserted coaxially on the (projecting axial) stretch proximal to the axial downstream end of the auger  15  at a non-null distance from the axial downstream end of the auger  15  itself (for example, at a distance substantially less than or equal to axial length of a spiral of the auger  15  itself and, for example, greater than one half of the axial length of a spiral of an auger  15 ). 
     The toothed crown  42  can be made of a single body or, as in the example, made of a circumferential union of a plurality of separate/separable circumferential sectors. 
     The transmission unit  40  further comprises a connection flange  43  configured to mutually fix, or to rigidly connect, the toothed crown  42  and the auger  15 . 
     The connection flange  43  comprises, in detail, a connection tube  430  (or connection pipe), substantially cylindrical, which has a central axis arranged coaxially with the auger  15  and the toothed crown  42 . 
     In the example, the connection tube  430  has an inner cylindrical cavity, coaxial with the central axis thereof, which is inserted (with reduced or null radial clearance) coaxially on the auger  15 , i.e. on the projecting axial stretch thereof, in other words on the (projecting axial) stretch proximal to the axial downstream end of the auger  15  at a non-null distance from the axial downstream end of the auger  15  (for example, at a distance substantially less than or equal to the axial length of a spiral of the auger  15  itself). 
     In practice, the axial downstream end of the auger  15  projects axially beyond the proximal axial end of the connection tube  430  (and of the toothed crown  42 ) by a non-null axial distance, for example less than or equal to the axial length of a spiral of the auger  15  itself, i.e. a pitch of the auger  15 ).Preferably, the connection tube  430  has an axial length substantially comprised between a quarter (¼) of the pitch of a spiral and one (1) pitch of a spiral of the auger  15  (or in any case less than or equal to a pitch of a spiral), wherein the pitch of the spiral essentially means the axial length of a spiral of the auger  15 . 
     Advantageously, the connection tube  430  has an axial length comprised between one third (⅓) of the pitch of a spiral and one half (1½) of the pitch of a spiral of the auger  15  (or in any case less than or equal to one half of the pitch of a spiral). 
     Alternatively or in addition, the connection tube  430  has an axial length less than the external diameter (maximum) of the auger  15 , for example less than ⅓ (one third) of the external diameter (maximum) of the auger  15 . 
     The aforesaid relative dimensioning between the auger  15  and the connection tube  430  is designed to allow the correct (and constant) axial advancement of the solid fraction transported by the auger  15  towards the axial downstream end thereof, preventing and/or limiting at most the risk of clogging (at the stretch affected by the connection tube  430 ) which would generate malfunctions or need for maintenance and/or restoration interventions of the discharge flow for the device  10 . 
     Again, the connection tube  430  has an outer barrel, which has at least one cylindrical stretch coaxial with the central axis thereof, which cylindrical stretch is inserted (with reduced or null radial clearance) coaxially into the internal cylindrical cavity of the toothed crown  42 . 
     In the cylindrical stretch there is a plurality of radial through holes, each having its own substantially radial through axis (i.e. all converging onto the central axis of the connection tube  430 ), which are for example aligned along a helical trajectory, with the same pitch as the pitch of the auger  15  (and for example spaced out from each other by a predetermined angular distance, that is preferably constant). 
     Furthermore, the connection tube  430  comprises at least one crest  432  projecting in the radial direction to the outside of the connection tube itself, i.e. projecting radially towards the outside of the cylindrical stretch of the outer barrel of the connection tube. The crest  432  is for example a central crest, i.e. axially interposed between the opposing axial ends of the connection tube  430 . 
     It is not excluded that the crest  432 , as illustrated in  FIGS. 9 and 10 , may be arranged in proximity to a (single) axial end of the connection tube  430 , for example proximal or at the axial end of the connection tube  430  facing towards the upstream axial end of the auger  15 . 
     The crest  432  defines an axial face which is substantially planar and lying on an orthogonal plane to the central axis of the connection tube  430 . 
     The radial height of the crest  432  is greater than the difference between the inner radius of the inner cylindrical cavity of the toothed crown  42  and the outer radius of the cylindrical stretch of the outer barrel of the connection tube  430 . 
     In practice, the crest  432  (or the axial face thereof) defines an axial support shoulder for the toothed crown  42 , when this is fitted axially onto the cylindrical stretch of the connection tube  430 . 
     Furthermore, the radial height of the crest  432  is less than the (minimum) outer diameter of the toothed crown  42 , i.e. so as not to project radially beyond the latter i.e. to be comprised within the radial dimension thereof. 
     The crest  432  has at least one axial through hole, which has the through axis thereof parallel to the central axis of the connection tube  430 . 
     The crest  432  (i.e. the axial face thereof) may be an annular crest (or face) around the entire circumference of the connection tube  430  or, alternatively, may be formed by a plurality of discontinuous circumferential stretches, wherein for example the axial face of each circumferential stretch is coplanar with the axial face of the other circumferential stretches (and has a respective axial through hole). 
     In the example, the connection tube  430  can comprise two further crests  433  (parallel to the central crest  432 ) which are arranged at the respective axial ends of the connection tube. 
     The radial height of the two further crests  433  is less than the radial height of the crest  432 . 
     Alternatively, as illustrated in  FIGS. 9 and 10 , the connection tube  430  could have, as the only crest, the aforesaid crest  432 . 
     Said crest  432  can be made as a single body with the connection tube  430  or be permanently fixed thereto (for example by welding or by interference) or in a releasable way (for example by means of a threaded connection or the like). 
     The transmission unit comprises a first connection which is configured to rigidly fix the auger  15  to the connection tube  430 . 
     The first connection, in a first embodiment shown in  FIGS. 1-8 , comprises (or consists of) a first threaded connection which is configured to rigidly fix the auger  15  to the connection tube  430 , in a releasable way. 
     In this case, the first threaded connection comprises a plurality of radial screws  440  configured to be inserted into the radial through holes made in the connection tube  430 . 
     Alternatively, like in the embodiment shown in  FIGS. 1-6 and 9-10 , the first connection comprises (or consists of) a first welded connection  444  (or a weld), which is configured to rigidly fix the auger  15  to the connection tube  430 , permanently. 
     In this case, the connection tube  430  may not have the aforesaid radial through holes, but may be substantially full and free of holes. 
     In particular, the first connection also comprises one or more connection blocks  441 , which are individually fixed inside the connection tube  430 . 
     For example, in the case in which the first connection is defined by the first threaded connection, the connection blocks  441  are placed at radial through holes t(where provided) by means of said radial screws  440 . 
     Each connection block  441  defines an internal axial shoulder for a respective stretch of the auger  15 , i.e. of the projecting axial stretch thereof (inserted into the connection tube  430 ) 
     The first connection then comprises first axial screws  443  (illustrated only in  FIGS. 9 and 10 ) inserted axially into axial holes made in each of the connection blocks  441  and screwed onto threaded axial holes made in the (projecting axial stretch of the) auger  15 . In practice, each connection block  441  is placed in contact with a respective stretch of the auger  15  to which it is fixed through such first axial screws  443 . 
     It is not excluded that, alternatively, the radial screws  440  are adapted to directly fix the auger  15  to the connection tube  430  for example by passing through the radial through holes and screwing into the radial threaded holes on the outer crest of the auger  15 . For example, the connection blocks  441  have at least one surface (of contact with the auger  15 ) shaped like a stretch of helicoid, i.e. adapted to match the surface of the auger  15  with which it is in contact. 
     Preferably, the connection blocks  441  are defined by one or more stretches of a further (helical) auger, which defines a portion of the drive auger. 
     Said connection blocks  441  (defining the drive auger) have, for example, the same pitch as the auger  15  (i.e. the stretch of the auger  15  to which they are fixed) and preferably the same internal diameter. 
     Advantageously, the connection blocks  441  (defining the drive auger) have an external diameter (slightly) greater than the external diameter of the auger  15  (i.e. the stretch of the auger  15  to which they are fixed). 
     The connection blocks  441  can be spaced along the helical profile they define (defining separate stretches of helicoid) or can be joined together to form a single continuous helical stretch. 
     The connection blocks  441 , for example, extend on an axial stretch of the auger  15  less than or equal to the axial length of the connection tube  430 . 
     The transmission unit  40  further comprises a second connection, for example a second threaded connection, which is configured to (directly and) rigidly fix the toothed crown  42  to the connection tube  430 , i.e. to the crest  432  thereof. 
     The second threaded connection comprises a plurality of second axial screws  445 , which are inserted axially inside axial through holes made in the crest  432  and screwed onto axial through holes made in the toothed crown  42  (or in each circumferential sector thereof). 
     In practice, the radial face of the crest  432  is placed in contact with (a respective circumferential sector of) the toothed crown  42  to which it is fixed through such second axial screws  445 . 
     The device  10  further comprises a containment housing  50  which is configured to contain the transmission unit  40  and/or the projecting axial stretch of the auger  15 , i.e. the proximal stretch of the auger  15  and comprising the axial downstream end thereof, (and support the motor unit  30 ). 
     The containment housing  50  has a substantially box-like shape defined by a plurality of walls delimiting an (empty) internal volume. 
     In particular, the containment housing  50  has an axial extension along a longitudinal axis that is substantially parallel and concentric to the longitudinal axis of the channel  13 ; in detail, the containment housing  50  axially extends the channel  13 , as will be better described below, on the side of the axial downstream end thereof. 
     The containment housing  50  comprises a first axial wall, in which an access mouth  51  is obtained, e.g. circular, and a second wall, in which a discharge mouth  52  is obtained, e.g. also circular. 
     In the example illustrated, the second wall is an axial wall axially opposing the first wall and, for example, the discharge mouth  52  is axial, i.e. orthogonal to the longitudinal axis (or orthogonal to the axis of rotation of the auger  15 ). 
     For example, the discharge mouth  52  is closed (in an openable way, for example spontaneously) by a hatch, for example tilting (hinged with respect to an axis orthogonal to the axis of the auger  15  placed above the hatch itself). 
     It is not excluded that the discharge mouth  52  and/or the second wall is arranged (at the bottom) in the radial direction with respect to said longitudinal axis. Therefore, the containment housing  50  comprises a side wall, e.g. box-like, that joins together the first wall and the second wall delimiting, inside it, a containment environment. 
     The first wall is fixed, for example through axial fixing screws, rigidly (and directly) to (a fixing flange that surrounds) the axial downstream end of the channel  13 , so that the access mouth  51  is actually coaxial and facing the second outlet mouth  135  of the channel  13 . 
     In particular, the access mouth  51  is fitted onto the projecting axial stretch of the channel  13  of the auger  15 , so that the latter is (contained totally) inside the containment housing  50 . 
     The containment housing  50  comprises a first axial (upstream) stretch proximal to the channel  13 , which is axially delimited by the first wall provided with the access mouth  51 , which defines a first (axial) portion of the containment environment, in which the aforesaid projecting axial stretch of the auger  15  is contained and the transmission unit  40  (in its entirety). 
     In practice, the first portion of the containment environment is axially delimited (upstream) by the first wall and in the circumferential direction by an axial (enlarged) portion of the side wall. 
     The first portion of the containment environment is then axially delimited by an opposing intermediate wall to the first wall and surrounding in the circumferential direction the downstream free end of the auger  15  (and of the connection tube  430 ). 
     The first portion, in practice, is divided (radially) into two compartments, of which a first radially internal compartment, which contains the auger  15 , i.e. the projecting axial stretch thereof, and a second compartment, radially external, which contains the transmission unit  40 . 
     In practice, the first compartment and the second compartment are separated radially (and axially) by the connection flange  43 , i.e. by the connection tube  430  thereof; e.g. the first compartment is placed inside the connection tube  430  and the second compartment is placed outside the connection tube  430 . 
     The device  10  further comprises sealing gaskets  45  configured to keep the first compartment and the second compartment separate. 
     In detail, the device  10  comprises a pair of gaskets  45 , preferably annular, arranged axially on opposite sides with respect to the connection flange  43  (i.e. the connection tube  430 ) and that are respectively interposed between an axial end of the connection flange  43  (i.e. of the connection tube  430 ) and a wall that delimits the first compartment (and the second compartment). 
     In detail, a first (annular) gasket  45  is fixed (for example through screws) inside the first wall coaxially to the access mouth  51  so as to delimit it perimetrally. 
     The first gasket  45  is configured to be interposed (compressed and/or in contact) between the first wall and the axial face (turned towards the axial upstream end of the auger  15 ) of one of the further crests  433  of the connection tube  430 . 
     Again, a second (annular) gasket  45  is fixed (e.g. through screws) inside the intermediate wall of the containment housing  50  opposing the first wall and surrounding in the circumferential direction the free downstream end of the auger  15  (and of the connection tube  430 ), so as to be coaxial to the first gasket and to face it. 
     The second gasket  45  is configured to be interposed (compressed and/or in contact) between the intermediate wall and the axial face (turned towards the axial downstream end of the auger  15 ) of one of the further crests  433  of the connection tube  430 . 
     The gaskets  45 , in practice, sealingly divide the first compartment and the second compartment, preventing any mutual contamination. 
     The portion of side wall that surrounds the first compartment can provide a (radial) discharge hole  46  serving a discharge conduit  460  of the liquid phase transported by the auger  15  (together with the solid phase) inside the containment housing  50 . Furthermore, the portion of first wall surrounding the second compartment can have an eccentric passage hole separate from the access mouth  51 , in which the output shaft  321  (of the reducer  32 ) of the motor unit  30  is inserted. 
     The containment housing  50  comprises a second axial (downstream) stretch proximal to the channel  13 , which is axially delimited by the second wall provided with the outlet mouth  52 , which defines a second (axial) portion of the containment environment. 
     In practice, the second portion of the containment environment is axially delimited (downstream) by the second wall and in the circumferential direction by an axial (tapered) portion of the side wall and axially (upstream) by the intermediate wall (and/or by the second gasket  45 ) surrounding in the circumferential direction the free downstream end of the auger  15  (and of the connection tube  430 ). 
     The second portion, in practice, delimits a third compartment, which axially extends the first compartment. 
     The device  10  can comprise a final compacting screen  55  (see  FIG. 4  and  FIGS. 7-8 and 9-10 ), which is configured to compact the solid fraction discharged through the discharge mouth  52  (and/or reduce the quantity of liquid fraction contained therein). 
     The final compacting screen  55  is placed inside the protection casing  50 , for example in the third compartment, (coaxially) upstream of the discharge mouth  52 . 
     Preferably, the final compacting screen  55  comprises (or consists of) a filtering sleeve (for example made of mesh, preferably metallic), preferably with tubular shape, for example cylindrical. 
     For example, the final compacting screen  55  is inserted (with reduced radial clearance) coaxially on the end stretch of the auger  15  (which projects axially beyond the connection tube  430 ) provided with the axial downstream end thereof. 
     The auger  15  (i.e. the terminal stretch thereof inserted inside the final compacting screen  55 ) affects a limited axial stretch of the final compacting screen  55 , i.e. it extends over a limited axial stretch, preferably not greater than the half of the axial length of the final compacting screen  55  itself. Preferably, the axial stretch of the final compacting screen  55  not occupied axially by the auger  15  has a length substantially equal to one (1) pitch of the spirals of the auger  15  itself. 
     The overall length of the final compacting screen  55 , for example, is substantially equal (or slightly greater than) to  1 . 5  times the pitch of the spirals of the auger  15 . 
     In practice, the final compacting screen  55  has an upstream end inserted on the terminal stretch of the auger  15  projecting axially beyond the connection tube  430  and an opposed free downstream end, which is placed for example at or in proximity to the discharge mouth  52  (for example substantially coinciding therewith). 
     The upstream end of the final compacting screen  55  substantially defines an access mouth of the third compartment. 
     The final compacting screen  55  in fact divides (radially) the third compartment in which it is located into two separate environments, of which:
         a first (radially internal) environment in communication with the upstream end of the final compacting screen  55  (i.e. the access mouth of the third compartment from which the solid fraction transported by the auger  15  enters the third compartment itself) and with the downstream end of the final compacting screen  55  (i.e. the discharge mouth  52 , from which the more compacted solid fraction, i.e. more squeezed, leaves the third compartment to be discharged from the device  10 ); and   a second (radially external) environment for the collection and discharge of the leachate, in fluid communication with (or provided with) the discharge hole  46  and/or the discharge conduit  460  of the residual liquid fraction (leachate), from which it is removed by the containment casing  50 .       

     The final compacting screen  55  defines radial openings (on the filter sleeve) from which the residual liquid phase (leachate) possibly present in the solid fraction (already) separated by means of the auger  15  (keeping the solid fraction in its inside) radially exits allowing to obtain a high squeezing degree of the solid fraction. 
     The holes of the final compacting screen  55  (i.e. the filtration gap of the final compacting screen  55 ) have dimensions substantially comprised between 0.5 mm and 10 mm, preferably comprised between 3 mm and 5 mm. 
     Preferably, the compacting screen  55  is fixed with respect to the auger  15 , i.e. it is (rigidly) fixed to the support frame  11  (or preferably it is rigidly fixed to the containment casing  50 , for example in a removable way (preferably by bolting). 
     In practice, the terminal portion of the auger  15  which is axially inserted inside the axial stretch of the final compacting screen  55 , with its revolution motion around the axis of rotation of the auger  15 , exerts a scraping and/or transport/compaction action of the solid fraction inside the final compacting screen  55  which allows:
         a) the discharge (when suitably squeezed) from the discharge mouth  52 ; and   b) the effective squeezing and separation of the liquid fraction still present therein which is discharged by means of the discharge hole  46 .       

     It has been observed that the relative motion between the auger  15  and the final compacting screen  55  allows the effective axial advancement of the solid fraction (without this being clogged in the third compartment) and the continuous and effective squeezing of the same. 
     The device  10  can comprise a separation unit of the solid fraction from the liquid fraction. 
     The separation unit is generally placed upstream of the auger  15 , i.e. inside the box-like body  12  described above. 
     The separation unit comprises, for example, a first filtering baffle  16  associated with the support frame  11  so as to intercept the fluid that flows from the inlet mouth  121  to the first outlet mouth  125  and configured so as to withhold and accumulate a part of the solid fraction at at least a first surface  161  of the first filtering baffle  16 , e.g. placed inside the box-like body  12 . 
     The first filtering baffle  16  has a tubular shape with a larger diameter than the outer diameter of the auger  15  and the channel  13  and is inserted, e.g. coaxially, onto the first portion  151  of the auger itself. 
     The inner surface  161  of the first filtering baffle  16  is, in practice, facing (radially and/or vertically aligned to) the first portion  151  of the auger  15 . 
     The first filtering baffle  16  is supported at the opposite ends by the first wall  120  and by the second wall  122  of the box-like body  12 . 
     In practice, the first filtering baffle  16  has an axial length substantially equal to the distance between the first wall  120  and the second wall  122  of the box-like body  12 . 
     The first filtering baffle  16  is rotatably associated with respect to its own axis about the first stretch  131  of the channel  13 . 
     In practice, between the second wall  122  of the box-like body  12  and the upper end of the first filtering baffle  16  a swivel ring  17  is interposed adapted to rotatably constrain the first filtering baffle  16  to the support frame  11 . 
     The first filtering baffle  16  comprises at least one collection and accumulation shovel  162  of the solid fraction that is fixed onto the inner surface  161 . 
     The shovel  162  has a substantially equal length to the length of the first filtering baffle  16  and, for example, is placed with a longitudinally parallel axis to the axis of the first filtering baffle itself. 
     However, it is not excluded that the shovel  162  can have a helical extension or may be inclined with respect to the axis of the first filtering baffle  16 . 
     The shovel  162  can be substantially radial or preferably, as in the example, have an inclination with respect to the radial direction of an acute angle, substantially equal to (or around) 30° forwards with respect to the rotation direction of the first filtering baffle  16 . 
     The first filtering baffle  16  comprises a plurality of shovels  162  distributed and distanced (e.g. equidistant and/or parallel) along the inner surface  161 . 
     The first filtering baffle  16  comprises a first plurality of through holes, e.g. uniformly distributed along the cover thereof. 
     The holes are configured so as to withhold the solid fraction and let the liquid fraction of the fluid that passes from the inlet mouth  121  towards the outlet mouth  125  flow out. 
     A further motor  170  is associated with the top end of the first filtering baffle  16  (e.g. associated with a gear motor and motion transmission means like a series of gears or a belt-pulley coupling) adapted to activate in rotation the first filtering baffle  16  about the axis thereof. 
     The motor  31  and the further motor  170  are independent from each other. 
     It is not excluded that the motor  31 , with appropriate motion transmission members, may be able to place in rotation both the auger  15  and the first filtering baffle  16 . 
     The separation unit can further comprise a second filtering baffle  18  associated with the support frame  11  so as to intercept the fluid that flows from the inlet mouth  121  to the first outlet mouth  125 . 
     The second filtering baffle  18  is placed upstream of the first filtering baffle  16  in the advancement direction of the fluid from the inlet mouth  121  to the first outlet mouth  125  and is configured so as to withhold and accumulate a part of the solid fraction at at least a concave surface  181  thereof. 
     The second filtering baffle  18  comprises at least a part inserted into the first filtering baffle  16 , e.g. interposed radially between the first filtering baffle  16  and the auger  15 . 
     The second filtering baffle  18  has a substantially truncated cone shape, with a larger outer and inner diameter than the outer diameter of the auger  15  and of the channel  13 . The second filtering baffle  18  is inserted, for example coaxially, onto the second portion  152  of the auger itself with concavity facing towards the free end of the auger  15 , i.e. the end of the auger  15  placed at the inlet mouth  121  and for example projecting outside the box-like body  12 . 
     In practice, the enlarged end of the second filtering baffle  18  is radially aligned on an intermediate stretch (or proximal to the free end) of the second portion  152  of the auger  15 . 
     The tapered end of the second filtering baffle  18  is radially aligned and fitted onto the end of the second portion  152  of the auger  15  constrained to the first portion  151 , i.e. in the joining area between the first portion  151  and the second portion  152  of the auger  15  (more in particular, in the joining area between the first stretch  131  and the second stretch  132  of the channel  13 ). 
     It is not excluded that the second filtering baffle  18  can equivalently be substantially disc- or tube-shaped or be a combination of the two, according to requirements. 
     The second filtering baffle  18  is adapted to obstruct the bottom open end of the first filtering baffle  16 , substantially intercepting the inlet mouth  121 . 
     In the example, the second filtering baffle  18  is fixed to the first filtering baffle  16 , e.g. the enlarged end of the second filtering baffle  18  is fixed to the lower free end of the first filtering baffle  16 , e.g. through bolted flanges. 
     The concave surface  181  of the second filtering baffle  18  is, in practice, facing (radially and/or vertically aligned to) the second portion  152  of the auger  15 . 
     The second filtering baffle  18  has a substantially shorter axial length than the axial length of the first filtering baffle  16 , e.g. substantially equal to ¼ of the axial length of the first filtering baffle  16 . 
     The second filtering baffle  18  is rotatably associated with respect to its own axis about the second stretch  131  of the channel  13 . 
     In the example, the second filtering baffle  18  is drawn in rotation, e.g. by the second motor  170 , through the first filtering baffle  16  (which are solidly associated in rotation). 
     However, it is not excluded that a further independent motor can directly draw in rotation the second filtering baffle  18  which can be unconstrained from the first filtering baffle  16 . 
     The second filtering baffle  18  comprises at least one collection and accumulation shovel  182  of the solid fraction that is fixed onto the concave surface  181 . 
     The shovel  182  has a substantially equal length to the length of a generatrix of the second filtering baffle  18  and, for example, is placed with its longitudinal axis parallel to the axis of the second filtering baffle itself. 
     However, it is not excluded that the shovel  182  can have a helical extension or be inclined with respect to the axis of the second filtering baffle  18 . 
     The shovel  182  can be substantially radial or preferably, as in the example, have an inclination with respect to the radial direction of by acute angle, substantially equal to (or around) 30° forwards with respect to the rotation direction of the second filtering baffle  18 . 
     The second filtering baffle  18  comprises a plurality of shovels  182  distributed and distanced (e.g. equidistant and/or parallel) along the concave surface  181 . 
     The second filtering baffle  18  comprises a first plurality of through holes, e.g. uniformly distributed along the cover thereof. 
     In particular, the holes place in communication the concave surface  181  with the internal volume of the first filtering baffle  16 . 
     The holes are configured so as to withhold the (coarse) solid fraction and let the liquid fraction of the fluid that passes from the inlet mouth  121  (inside the first filtering baffle  16  and from this) towards the outlet mouth  125  flow out. 
     The holes in the second filtering baffle  18  are larger than the holes of the first filtering baffle  16 . 
     The device  10  further comprises at least one annular gasket  19  adapted to surround the inlet mouth  121  and substantially sealingly connect the inlet mouth  121  with at least one from between the first filtering baffle  16  and the second filtering baffle  18 . 
     In the example, the annular gasket  19  comprises a flexible lip a first end of which is fixed along the entire (internal) perimeter of the inlet mouth  121  and the second free end of which is adapted to rest in a forced way on the outer perimeter portion of the concave surface  182  of the second filtering baffle  18  (e.g. at a bolted flange that constrains the first filtering baffle  16  to the second filtering baffle  18 ). 
     In practice, the annular gasket  19 , as well as keeping the connection between the environment outside the box-like body  12  and the inside thereof watertight, so that the fluid being filtered enters the box-like body  12  only through the second filtering baffle  18 , is adapted to fluid-dynamically divide the first filtering baffle  16  from the second filtering baffle  18  itself (e.g. cooperating with a fixing flange that physically joins the first filtering baffle  16  to the second filtering baffle  18 ). 
     It is observed that the two environments into which the collection channel  1  is divided by the device  10 , i.e. the first environment communicating with the inlet of the fluid to be separated placed upstream of the device  10  (in which the fluid itself to be separated is contained) and the second environment placed downstream of the device  10  and communicating with the outlet of the liquid fraction separated from the fluid in separation (containing only the liquid fraction of the fluid itself), are only in fluid communication through (in sequence) the second filtering baffle  18  and the first filtering baffle  16  which during the passage of the fluid being filtered from the first environment to the second environment withhold a respective solid fraction that is transported, through the auger  15 , to the second outlet mouth  135 . 
     The device  10  comprises at least one cleaning unit  21 , 22  of at least one from between the first filtering baffle  16  and the second filtering baffle  18 . 
     In the example, the device  10  comprises a first cleaning unit  21  of the first filtering baffle  16  and a second cleaning unit  22  of the second filtering baffle  18 . 
     The first cleaning unit  21  comprises a first bar  210  provided with a plurality of dispensing nozzles of a washing fluid, e.g. a portion of fluid collected—through derivation means such as pumps and conduits not shown in the figure—from the same collection channel  1 , in the environment thereof placed downstream of the device  10  (i.e. in the environment in which the “clean” liquid fraction of the fluid is contained). 
     The first bar  210  is for example placed outside the first filtering baffle  16 , with the nozzles facing towards the surface of the first filtering baffle  16  opposite the inner surface  161 , e.g. fixed to the support frame  11 . 
     The first bar  210  has a length for example a substantially equal length to the length of the first filtering baffle  16  and is fixed, for example, with a longitudinally parallel axis to the axis of the first filtering baffle  16  itself. 
     In particular, the first bar  210  has the opposite ends fixed respectively to the first wall  120  and to the second wall  122  of the box-like body  12 . 
     For example, the first cleaning unit  21  comprises a plurality of said first bars  210  spaced out from each other (e.g. equidistant and/or parallel). 
     The first cleaning unit can further comprise a brush  211  (or more) placed outside the first filtering baffle  16 , so as to enter into brushing contact with the surface of the first filtering baffle  16  opposite the inner surface  161 . 
     The brush  211  is for example fixed to the support frame  11 . 
     The brush  211  has a length for example a substantially equal length to the length of the first filtering baffle  16  and is fixed, for example, with a longitudinally parallel axis to the axis of the first filtering baffle  16  itself (e.g. interposed between two first bars  210 ). 
     In particular, the brush  211  has the opposite ends fixed respectively to the first wall  120  and to the second wall  122  of the box-like body  12 . 
     The second cleaning unit  22  comprises a second bar  220  provided with a plurality of dispensing nozzles of a washing fluid, e.g. a portion of fluid collected—through derivation means such as pumps and conduits not shown in the figure—from the same collection channel  1 , in the environment thereof placed downstream of the device  10  (i.e. in the environment in which the “clean” liquid fraction of the fluid is contained). 
     The second bar  220  is for example placed outside the second filtering baffle  18  (and inside the first filtering baffle  16 ), with the nozzles facing towards the convex surface of the second filtering baffle  18  opposite the concave surface  181 , e.g. fixed to the support frame  11  (in particular to the channel  13 , at the first stretch  131  thereof). 
     The second bar  220  has a length for example a substantially equal length to the length of a generatrix of the second filtering baffle  18  and is fixed, for example, with a longitudinally parallel axis to the axis of the second filtering baffle  18  itself. 
     In particular, the second bar  220  has an end constrained to the channel  13  (at the joining zone between the first stretch  131  and the second stretch  132  thereof) and the opposite end free. 
     For example, the second cleaning unit  22  comprises a plurality of said second bars  220  spaced out from each other (e.g. equidistant and/or parallel). 
     In light of the above, the operation of the device  10  is as follows. 
     The fluid to be separated is conveyed into the collection channel  1  at the first end  1   a  thereof and is pushed (e.g. by gravity or forced by the same inertia of the fluid and by pumping means) towards the second end  1   b.    
     In practice, the fluid to be separated is compelled and forced to enter the device  10  through the inlet mouth  121  thereof. 
     Once the inlet mouth  121  has been crossed, the fluid being treated meets the second filtering baffle  18 , which withholds a part of the solid fraction, the coarse part, letting the liquid fraction flow out, together with a fine solid fraction, in the environment placed downstream of the second filtering baffle  18  in the crossing direction of the fluid, i.e. into the volume interposed between the second filtering baffle  18  and the first filtering baffle  16 . 
     The axial upstream end of the auger  15  is adapted to come into contact with the coarse solid fraction which is gradually loaded and accumulated inside the channel  13 . 
     In practice, the rotation of the auger  15  transports the solid coarse fraction from the axial upstream end of the auger  15  axially towards the axial downstream end thereof to then be discharged at the discharge mouth  52 . 
     The third compartment is, with the exception of the final compacting screen  55 , free from axial dimensions (e.g. there are no shafts or supports of the auger  15  or other bulky elements therein) that prevent the (natural) discharge of the solid fraction (even when particularly fibrous) from the discharge mouth  52 . 
     The invention thus conceived can undergo numerous modifications and variants all of which are covered by the inventive concept. 
     Moreover, all the details can be replaced by other technically equivalent elements. In practice, the materials used, as well as the contingent shapes and sizes, can be whatever according to the requirements without for this reason departing from the scope of protection of the following claims.