IT202000004087A1 - METHOD AND PLANT FOR THE RECYCLING OF SYNTHETIC GRASS INFILL - Google Patents

Description

DESCRIPTION

of the Italian Patent for Industrial Invention entitled:

? METHOD AND PLANT FOR THE RECYCLING OF THE INFILL OF GRASSY COVERS

SYNTHETIC?

TECHNICAL FIELD

The present invention relates to a plant for recycling the infill of synthetic turf, in particular for the recycling of infill composed at least of sand and rubber granules.

PRE-EXISTING TECHNIQUE

How ? known, synthetic turf surfaces generally comprise a carpet made of polymeric material on which? fixed a multiplicity? of synthetic grass blades, or in polymeric material, and on which an infill is distributed that has the task of partially filling the space between the synthetic grass blades to make them more? stable and to make more? the mantle is realistic.

The infill? substantially a granular mixture obtained by mixing sand, frequently more? sands of different diameters, dust and rubber granules (generally recycled rubber or thermoplastic rubber). This granular mixture interposes itself between the synthetic grass threads supporting them and also giving the synthetic turf functional characteristics of elasticity, reliability. and safety.

With wear, the synthetic turf must be replaced with a new one. A known problem, due to wear,? that the synthetic grass filaments detach from the carpet and end up in the infill. At the moment, the only known method of disposal consists in shredding the strips of synthetic turf with the infill still inside them, creating other mixed granular material, which for example can be used. be used as infill for another synthetic turf. In that case, said shredded material will be able to? be at the pi? used as a filling material. Purpose of the present invention? to make available a system that allows the removal of the synthetic grass filaments broken from the infill (when present) and the separation of the infill into its original components in order to allow a real reuse of the raw materials of which? constituted the infill.

Such purpose? achieved by the features of the invention reported in the independent claims. The dependent claims outline preferred and / or particularly advantageous aspects of the invention.

EXPOSURE OF THE INVENTION

The invention, in particular, makes available a method for the recycling of the infill of a synthetic turf, or for the separation of the infill into its original components, said infill being formed by a plurality of turf. of different granular materials including at least sand granules having a diameter between 100? m and 1400? m and polymeric material granules with a diameter of between 800? m and 2500? m, said method comprising the following steps:

- dry the infill, for example at a temperature between 90? C and 150? C,

- sifting the previously dried infill through a first screening grid with through openings with a diameter between 2900? m and 3100? m,

- direct the infill that does not pass through the first screening grid towards a suitable container,

- screen the infill that crosses the first screening grid through a second screening grid with through openings between 1300? m and 1500? m,

- direct the infill that does not cross the second screening grid towards a suitable container,

- screening the infill that crosses the second screening grid into a third screening grid having through openings with a diameter between 700? m and 900? m,

- separate according to the difference in density? of the materials, for example by means of a vibrating densimetric table or gravimetric separator, in the infill that does not cross the third screening grid, the granules of polymeric material from the sand granules and direct them towards respective different containers,

- direct the infill that passes through the third screening grid towards a suitable container.

So ? It is possible to obtain the granular materials of which? composed the same infill, each in a different container where? only that granular material is present, so that it is possible to directly reuse said materials for a new infill or for other purposes, without requiring further division operations.

In particular from the first screening phase? It is possible to extract the stones from the infill and have them arrive in a special container. The material that passes through the second sieve grid, but not the third sieve grid,? consisting of a mixture of sand granules and polymeric material granules both having a diameter between 800? m and 1400? m which thanks to the subsequent separation phase based on the density? ? It is possible to divide into a group of only polymeric material granules and a group of sand granules only.

According to an aspect of the invention, in the event that the infill also includes synthetic grass filaments of the synthetic turf belt, the method can be used. understand, during the drying phase, the phase of sucking said synthetic grass filaments from the infill and conveying them to a suitable container.

In this way it is avoided that the filaments of synthetic grass, which due to wear can detach from the carpet of the turf belt, can pollute the separated materials after the drying phase.

This phase can? also include that of sucking the dust from the infill during the drying phase.

The invention also makes available an infill recycling plant, made up of a plurality of products. of different granular materials, of a synthetic turf said plant comprising:

- a fluid bed type dryer equipped with a drying chamber comprising an inlet, a first outlet crossed by the dried infill and a second outlet at which? connected a suction group configured to generate a vacuum inside the drying chamber,

- a vibrating type screening machine equipped with an inlet located downstream of the first outlet of the dryer and which comprises a first screening grid having through openings with a diameter between 2900? m and 3100? m, a first outlet for the granular material which does not pass through the through openings of the first screening grid, a second screening screen placed downstream of the first screening screen having through openings with a diameter between 1300? m and 1500? m, a second outlet for the granular material that does not pass through the second screening grid, a third screening grid located downstream of the second screening grid and having through openings with a diameter between 700? m and 900? m, a third outlet for the material that does not pass through the third screening grid,

- a vibrating densimetric table, or a gravimetric separator, placed downstream of the third outlet of the screening machine equipped with a first outlet and a second outlet and what? configured to convey towards the first outlet the granular material having density? higher than a pre-set threshold value and towards the second exit the granular material having density? lower than the preset threshold value.

So ? made available a particularly efficient plant in obtaining, from an infill present in a belt of synthetic grassy material, the granular materials of which? composed the same infill, each in a different container where? only that granular material is present, so that it is possible to directly reuse said materials for a new infill or for other purposes, without requiring further division operations.

According to one aspect of the invention, the plant can? include a removal machine that mechanically removes the infill from the synthetic turf belt and? equipped with an inlet in which the synthetic turf belt is positioned, a first outlet from which the infill removed from the turf belt comes out, and what? connected to the inlet of the dryer, and a second outlet from which the belt of synthetic turf, cleaned of the infill, comes out.

So ? It is possible to directly treat the strips of synthetic grassy material with a single system, without the need? of passages and intermediate transports. According to another aspect of the invention, the dryer can? comprising an apparatus for introducing hot gas into a lower portion of the drying chamber, a perforated table placed above a portion of the drying chamber into which the introducing apparatus introduces the hot air under pressure, a plurality of of bulkheads placed at a higher level than the perforated table and shaped to direct the flow of gas generated by the inlet apparatus towards the second outlet of the dryer, in which the second outlet? made in a portion of the top? of the drying chamber.

Thanks to these characteristics, the plant? able to remove dust and any filaments of synthetic grass that have detached from the turf and pollute the infill in a particularly effective way.

According to a further aspect of the invention, the plant can? understand a first transportable platform to which? fixed the dryer, a second transportable platform to which? fixed to the screening machine, a conveyor device equipped with a first end? suitable to be connected to the first exit of the dryer, a second end? able to be connected to the entrance of the screening machine, a first coupling device integral with the first transportable platform in which one of the first extremities is and the second extremity? of the conveyor device? pivotally associated in an idle manner to the respective transportable platform.

A known problem with the disposal of synthetic turf fields? that ? when should this synthetic turf field be replaced? it is necessary to transport the turf belts to the site where the disposal plant is located and then return the infill to the site where the field to be replaced is located to insert the infill into the new synthetic turf.

This activity? therefore involves high times and costs due to the transport of the materials to be processed and those processed, as generally to transport the synthetic turf used to create a field of 7200m ^ 2 16 containers of standard size 20 feet, or 6058 mm, are required, for the handling of which 16 trucks are required each for the transport of a single container or 8 trucks equipped with trailers and capable of transporting two containers at a time. A further problem? the environmental pollution generated by such a large number of moving trucks.

This characteristic allows to solve the aforementioned problem of the prior art by bringing the system where the turf with infill to be disposed of is located. In particular, each mobile platform has the footprint of a standard 20-foot container, therefore it can? only one truck is needed to transport both.

Yet another aspect of the invention provides that the first transportable platform and the second transportable platform can each comprise a plurality of materials. of hollow seats to allow the attachment of the platform to the wagon of a vehicle.

A further aspect of the invention provides that the infill removal machine may comprise a support frame, a conveyor apparatus connected to said support frame and configured to move the synthetic turf belt through a predefined path along which the infill is removed from the synthetic turf, in which the conveyor apparatus comprises a final portion on which the synthetic turf belt is rolled up after the removal of the infill, which at least partially defines the second outlet of the removal machine itself and which has a first section and a second section contiguous to form a V, of which the first section at one of its extremities? ? rotatably associated with respect to a hinge axis, in an idle way, to the support frame of the infill removal machine and to the opposite end? ? associated with the second section, and in which the implant includes a coupling mechanism configured to fix in a removable way an end? free of the second section to the support frame of the removal machine.

So ? made available a machine particularly effective in removing the clogging and which minimizes the possibility? breakage of synthetic grass filaments.

According to another aspect of the invention, the clog removal machine can? be fixed to the second transportable platform and in which the final portion of the conveyor apparatus? movable in rotation with respect to the hinge axis between a first position in which the second section? integral by means of the coupling mechanism to the support frame of the infill removal machine and the final portion? vertically contained in the horizontal dimension defined by the second transport platform, and a second position, in which the second section? disengaged from the coupling mechanism and the final portion protrudes externally with respect to the horizontal dimensions of the second transport platform.

In this way the machine is easily transportable thanks to the possibility? to reduce the footprint, which also allows, at par? of space of dimensions of the transportable platform, to have more? space for other machinery which can therefore be more? large, or have higher hourly productions. The invention also makes available a method for separating synthetic grass filaments from an infill containing said filaments, using a fluidized bed dryer.

In particular, this method can? understand the steps of:

- prepare a fluidized bed dryer equipped with an inlet, a first outlet and a second outlet, at which? connected a suction group configured to generate a vacuum inside the drying chamber

- insert the infill containing the synthetic grass filaments in the dryer - vacuum the turf threads while the infill is dried inside the dryer.

The invention also makes available a method for the separation of rubber granules coming from an infill having a diameter between 800? M and 1400? M from sand granules coming from the same infill having a diameter between 800? M and 1400? M, using a vibrating densimetric table, i.e. a gravimetric separator.

BRIEF DESCRIPTION OF THE DRAWINGS

Further characteristics and advantages of the invention will become evident from reading the following description provided by way of non-limiting example, with the aid of the figures illustrated in the attached tables.

Figure 1? a schematic plan view of a plant according to the invention. Figure 2? a schematic side view of a first portion of the implant of figure 1.

Figure 3? a schematic side view of a second portion of the plant of figure 1.

Figure 4? a schematic side view in section according to a vertical plane of a dryer of the plant of figure 1.

Figure 5? a schematic side view in section according to a vertical plane of a machine for separating the infill of the plant of figure 1.

Figure 6? an enlargement of a filtering unit of the plant of figure 1. Figure 7? a schematic side view in section according to a vertical plane of a vibrating densimetric table of the plant of figure 1.

BEST WAY TO IMPLEMENT THE INVENTION

With particular reference to these figures, yes? 1 generally indicates a disposal and recycling plant for the infill present in synthetic turf belts.

Pi? in particular, the plant 1? configured to separate the infill in the different materials of which? composed.

Also, the particular plant 1? preferably also shaped to carry out the removal of the infill from the belt of synthetic turf in which? content. The infill? formed by a plurality? of different granular materials.

Said plurality? of granular materials includes sand, or other inert granular material, having a diameter between 100? m and 1400? m, granules of polymeric material, generally rubber, with a diameter between 800? m and 2500? m and dust (the powder can be considered a granular material with a diameter smaller than that of sand, for example less than 50? m). In addition, the infill can? also include small stones, generally having a diameter greater than 3000? m. The polymeric material could be substituted or comprise elastic vegetable fibers such as coconut fibers, having the same diameter as the polymeric granular material.

The infill of a worn synthetic turf belt can also include filaments of the turf itself that have detached from the carpet of which? equipped the ribbon. These filaments are substantially bodies in polymeric material, of elongated shape, for example having a length greater than 10mm.

As mentioned above, the 1 plant can? comprise an infill removal machine 5 which removes mechanically, or by mechanical operations, the infill from the synthetic turf belt.

Alternatively, the system 1 could not include the infill removal machine and be configured to work the infill already? separated from the respective synthetic turf belt. However its presence? preferable in order to carry out all the recycling operations within the same plant.

The block removal machine 5 shown in the figures? configured to remove the infill by brushing the synthetic turf belt. The block removal machine 5? equipped with an inlet 6 in which the synthetic turf belt is positioned, a first outlet 7 from which the infill removed from the turf belt comes out and a second outlet 8 from which the synthetic turf belt, cleaned of infill, comes out .

The infill removal machine 5 comprises a support frame 10 equipped with a support base 15 (possibly connected to elements resting on the ground), and for example with a pair of side walls 20 which rise from said support base. 15.

The infill removal machine 5 comprises a brushing roller 25 The machine 5 also comprises a conveyor apparatus 35, configured to move the synthetic turf belt along a predefined path.

In particular, the conveyor apparatus 35 can be configured in such a way that, along at least a portion of the predefined path, the brushing roller 25 is wound in contact, at least partially, by the synthetic turf belt.

The path defined by the conveyor apparatus 35 can? be characterized by a plurality? of sections, for example side by side without solution of continuity, along which the belt of synthetic turf is moved.

In particular at the beginning and at the end of this path, the conveyor apparatus 35? respectively configured to unroll a roll of synthetic turf web and finally to re-roll the synthetic turf web 5 to form a roll.

The conveyor apparatus 35 comprises a first section 40 which defines a first transport surface, preferably flat and horizontal, on which the synthetic turf belt rests stably and on which it is moved.

It should be noted that, in this discussion, by transport surface we mean a real or imaginary surface on which the belt of synthetic turf rests at least in part, and? eventful.

In correspondence with the first section 40, the roll of the synthetic turf belt 5 is unrolled.

The conveyor apparatus 35 comprises a second section 45 which describes an elbow curve, for example directly connected to the first section 40, or connected thereto without interruption.

Said second section 45 is configured as a first inversion section, in which the synthetic turf belt makes a curve that subtends an angle greater than 90 degrees, in such a way as to spread the synthetic turf belt itself, or in such a way the synthetic grass threads that are part of the synthetic turf belt are to be spread apart.

The path can? then comprise a third section 50, for example connected to the second section 45 without interruption, in correspondence with which the synthetic grass belt wraps, at least in part, the brushing roller 25 of the machine 5.

Said third section 50? configured so as to keep a portion of the synthetic turf belt in contact with the brushing roller 25, for example so as to describe an arc subtending an angle between 90 degrees and 180 degrees.

In the illustrated embodiment, therefore, an end portion of the third portion 50 distal from the second portion 45 is positioned at a lower level than the second portion 45.

The terminal part of the path described by the conveyor apparatus 35 has a pair of contiguous sections forming a V, i.e. a sixth section 55 and a seventh section 60, also connected to each other and to the previous section without interruption, on which it is possible to re-roll the synthetic turf belt to form a roll and then move it easily and simply store it.

In particular, the conveyor apparatus 35 comprises a final portion on which the belt of synthetic turf is rolled up after the removal of the infill, which at least partially defines the second outlet 8 of the removal machine 5 itself and which has a first section (sixth section 55) and a second section (seventh section 60) contiguous to form a V.

The first section 55 of the final portion, at one end of it,? pivotally associated with respect to a hinge axis C (for example horizontal), in an idle manner, to the support frame 10 of the machine 5 for removing the infill and to the opposite end? ? associated with the second section 60 of the final portion.

In the illustrated embodiment, the conveyor apparatus 35 comprises a plurality of materials. of conveyors, for example of conveyor belts, which define the respective sections.

In the illustrated embodiment, the machine 5 comprises a plurality of of brushing rollers 25, each equipped with respective bristles, placed along the path defined by the conveyor apparatus 35.

The machine 5 also comprises a conveyor belt 70 placed at a lower level than the brushing roller 25, and vertically aligned with it, and configured to collect the infill that falls following its removal from the synthetic turf belt.

This conveyor belt 70 defines at least partially the first outlet 7 of the infill removal machine 5.

The machine 5 can? comprising a synthetic turf washing apparatus (not shown) which uses a washing liquid, such as water, to wash the synthetic turf belt which is carried along the predefined path.

In particular, the washing apparatus? configured to wash the synthetic turf belt in a portion of the predefined path downstream of the brush roller 25.

For example, the washing apparatus? equipped with a nozzle positioned in correspondence with the predefined path, configured to direct said washing liquid towards the synthetic turf belt.

The washing apparatus can also comprising a collection tank (not shown) for the washing fluid positioned at a lower level of the nozzles in such a way as to collect the washing liquid which the nozzles direct towards the synthetic turf belt.

The washing apparatus also comprises a tank (not shown) for the washing liquid and a pump (not shown) able to pressurize the washing liquid and send it to the nozzle.

The washing apparatus can be, for example, of the closed-circuit type and comprises channels suitable for placing the collection tank in fluid communication with at least one decantation tank, which? in turn in fluid communication with the tank from which the pump draws fluid to be pressurized.

The machine 5 can? furthermore it includes a drying apparatus equipped with a fan (not shown) positioned in correspondence with the predefined path and configured to generate a flow of air towards the synthetic turf belt such as to at least partially dry the washing liquid present in the turf belt synthetic grass. The fan? therefore positioned downstream of the washing apparatus with respect to the direction of the synthetic turf belt along the predefined path.

The plant 1 comprises a fluid bed type dryer 75 equipped with a drying chamber 80 in which the infill is dried, for example that coming from the first outlet 7 of the infill removal machine 5.

Said drying chamber 80 comprises an inlet 85, connected to the first outlet 7 of the machine 5 for removing the infill, for example by means of a conveyor belt 90, preferably directly by means of said conveyor belt 90.

Plant 1 can comprising means for moving the infill from the conveyor belt 90 through the inlet 85 of the dryer 75. Such means can for example comprise a conveyor belt or an auger.

The drying chamber 80 then comprises a first outlet 95 crossed by the dried infill and a second outlet 100 at which? connected a suction group configured to generate a vacuum inside the drying chamber 80.

Specifically, the second exit 100? shaped as an? opening made in a portion of the top? of the drying chamber 80 and the suction unit comprises a suction fan, which? placed in communication with said opening by means of a conduit 105.

Between the fan and the duct 105? interposed a filtering group 110 equipped with one or more? filtering septa 111 shaped in such a way as to retain threads of synthetic grass and dust. The filter assembly 110? also equipped with hoppers and / or ducts to direct the dust and filtered filaments to a suitable container, for example in the form of tubs or bags.

The dryer 75 comprises an apparatus 115 for introducing hot gas, for example hot air, into the drying chamber 80, for example configured so that the average temperature in the drying chamber is between 90 ° C and 150 ° C. Furthermore, the apparatus for introducing hot gas 115? configured to inject such hot gas into a lower portion of the drying chamber 80. For example, the hot gas inlet apparatus 115 comprises a plurality of gases. of nozzles (not shown) configured to introduce this hot gas into the drying chamber 80, preferably these nozzles are oriented so as to emit the hot gas upwards and / or horizontally.

The apparatus for introducing hot gas 115 comprises a burner 120.

The dryer also comprises an inlet apparatus 116 for fresh / cold gas, for example fresh / cold air, equipped with a mouth for inlet of said fresh air in a portion of the drying chamber in the vicinity of the drying chamber. of the first exit 95.

The dryer 75 comprises a perforated table 76 or a plurality of of perforated boards, placed above the area where the hot gas is introduced, or above the nozzles, and on which the infill coming from inlet 85 is moved. In particular, the dryer 75 includes a vibrating unit ( not shown) connected to the table, or tables, and configured to vibrate it in such a way that the infill moves from inlet 85 to first outlet 95.

Plant 1 can comprise a screening machine 125, for example of the nutation type, equipped with an inlet 130 located downstream of the first outlet 95 of the dryer 75. For example, the inlet 130 of the screening machine 125? connected to the first output 95 by means of one or more? Conveyors. It is not excluded that in an alternative embodiment the screening machine may be of the vibrating type.

In particular, the screening machine 125 comprises a box-shaped casing 135 equipped with an upper opening, made in a portion of the top. of the box-shaped casing 135, which at least partially defines the inlet 130.

The screening machine 125 comprises a first screening grid 140 having through openings with a diameter ranging from 2900 µm to 3100 µm, preferably 3000 µm, for example placed directly below the inlet 130 and at least partially contained in the box-like casing 135. Preferably the first screen 140? flat, lies on a substantially horizontal plane.

The screening machine 125 comprises a first outlet 145, for example comprising an opening made in a lateral portion of the box-shaped casing 135, for the granular material which does not pass through the through openings of the first screening grid 140.

Specifically said opening? placed at a higher vertical level than the vertical level of the first screening grid 140.

The 125 screening machine? then configured so that? only material with a diameter of less than 2900? m / 3100? m, that is, less than 3000? m, passes through the first screen screen 140 and that the material with a larger diameter remains above the first screen screen 140 and exits the box casing 135 through the first outlet 145.

The screening machine 125 comprises a second screening grid 150 placed downstream of the first screening grid 140, or located downstream of the through openings of the first screening grid 140. In particular, the second screening grid 150? placed below the first screen 140,? at least partially contained in the box casing 135,? flat and lies on a substantially horizontal plane.

The second sieve grid 150? equipped with through openings with a diameter between 1300? m and 1500? m, preferably 1400? m.

The screening machine 125 comprises a second outlet 155, for example comprising an opening made in a lateral portion of the box-shaped casing 135, for the granular material that does not pass through the through openings of the second screening grid 150, or for the material that remains between the first screening grid 140 and the second screening grid 150. Said opening? placed at a higher vertical level than the vertical level of the second screening grid 150.

The screening machine 125 comprises a third screening grid 160 placed downstream of the second screening grid 150, or located downstream of the through openings of the second screening grid 150. In particular, the third screening grid 160? placed below the first screen 140,? at least partially contained in the box casing 135,? flat and lies on a substantially horizontal plane.

The third sieve grid 160? equipped with through openings with a diameter between 700? m and 900? m, preferably 800? m.

The screening machine 125 comprises a third outlet 165, for example comprising an opening made in a lateral portion of the box-shaped casing 135, for the granular material that does not pass through the through openings of the third screening grid 160, or for the material that remains between the second screening grid 150 and the third screening grid 160. Said opening? placed at a higher vertical level than the vertical level of the third screening grid 160.

The screening machine 125 then comprises a fourth outlet 170, for example comprising an opening made in a lateral portion of the box-shaped casing 135, located downstream of the third screening grid 160 for the outlet from the screening machine 125 of the granular material which passes through the through openings of the third screening grid 160. Said opening? placed at a lower vertical height than the vertical height of the third screening grid 160.

The screening machine 125 comprises a base, equipped with feet resting on the ground, to which the box-shaped casing 135? connected through the interposition of an elastic element.

The screening machine 125 comprises a vibrating unit configured to vibrate the box-like casing 135.

The first outlet 145, the second outlet 155 and the fourth outlet 170 are connected by means of suitable pipes and / or conveyors to respective storage containers for the sieved granular material.

Being of the nutation type, the screening machine 125 comprises means for rotating the box-like casing 135 with respect to an axis of rotation, for example vertical, which? eccentric with respect to a center or center of gravity of the (circular) screening grids, so that the box-like body rotates by moving laterally during rotation with respect to a support base of the screening machine itself.

The plant 1 comprises a vibrating densimetric table 175, that is a gravimetric separator, placed downstream of the third outlet 165 of the screening machine 125, for example connected to it by means of a conveyor belt or an auger.

The 175 vibrating densimetric table? equipped with a first outlet 180 and a second outlet 185 and? configured to convey to a first outlet 180 the granular material having density? higher than a preset threshold value, for example within a range between 700kg / m ^ 3 and 1450kg / m ^ 3, preferably between 900kg / m ^ 3 and 1200kg / m ^ 3 and towards a second outlet 185 the material granular having density? lower than the preset threshold value.

In the present case, the sand comes out of the second outlet and the polymeric material (or the elastic vegetable fibers, for example coconut) comes out of the first outlet, since? the sand has a density? about 1500kg / m ^ 3 and the polymeric material (or the vegetable elastic fibers, for example coconut) has a density? about 650 kg / m ^ 3.

The first release? placed at a higher level than the first exit.

The vibrating densimetric table 175 comprises a flat plate 190 inclined with respect to a horizontal plane and equipped with through openings from which a flow of gas under pressure from a pumping unit of the densimetric table comes out in a direction from bottom to top. fluidly connected to said flat plate 190.

The flat plate 190? preferably inclined with respect to a horizontal plane by an angular value comprised between 9? and 13? and the through holes have a diameter between 200? m and 400? m.

The vibrating densimetric table 175 also includes a vibrating assembly configured to vibrate the flat plate 190.

Plant 1 comprises a first transportable platform 195 and a second transportable platform 200 to which? fixed at least part of the system components 1, for example to which all the system components are fixed.

System 1 comprises a load-bearing frame that rises from each transportable platform, equipped with vertical uprights and longitudinal longitudinal members that overhang the system, which load-bearing frame defines a volume inside which the components on the respective transportable platform are contained.

Preferably, each transportable platform has a length of about 6m.

Furthermore, each platform includes a plurality of of hollow seats, for example made in a lower portion of the platform itself, to allow the platform to be fixed to the wagon of a vehicle.

In the illustrated embodiment, the second platform 200? fixed the machine 5 for removing the infill, the filtering group 110 of the dryer 75, the screening machine 125 and the vibrating densimetric table 175. To the first platform 195? fixed the dryer 75, that is the drying chamber 80 and the burner 120.

The plant 1 comprises a first conveyor device 205, for example a conveyor belt, equipped with a first end? adapted to be connected to the first outlet 7 of the machine 5 for removing the infill and a second end? adapted to be connected to the inlet 85 of the dryer 75. The first conveyor device 205? hinged at the first end? to the machine 5 of removal of the infill and to the other end? ? it can be connected in a removable way to the dryer 75 by means of a coupling device integral with the dryer 75 and / or to the first platform 195.

The plant 1 comprises a second conveyor device 210, for example a conveyor belt, equipped with a first end? adapted to be connected to the first outlet 95 of the dryer 75, or to the conveyors downstream of the first outlet 95 of the dryer 75, and to a second end? adapted to be connected to the inlet 130 of the screening machine 125. The second conveyor device 210? hinged at the second end? to the sieving machine 125 of the infill and to the other end? ? detachably coupled to the dryer 75, or to the conveyor downstream of the dryer 75, by means of a coupling device integral with the dryer 75 and / or the first platform 195. In the preferred embodiment, the final portion of the conveyor apparatus 35 of the block removal machine 5? movable in rotation with respect to the hinge axis C and the implant 1 comprises a coupling mechanism configured to fix in a removable way an end? free of the second section 60 (i.e. the opposite end to that associated with the first section 55) to the support frame 10 of the infill removal machine 5 or equivalent to the second transportable platform 195, or to the support frame fixed to this platform .

The final portion of the conveyor apparatus 35? movable between a first position in which the second section 60? integral by means of the coupling mechanism to the support frame 10 of the infill removal machine 5 and the final portion? vertically contained in the horizontal bulk defined by the second transport platform 200, and a second position, in which the second section 60? disengaged from the coupling mechanism and the final portion protrudes externally with respect to the horizontal bulk of the second transport platform 200.

Does the operation of system 1? the following.

A belt of synthetic turf, generally rolled up, is inserted into the infill removal machine 5, in which, passing through the brushing roller 25, the infill is extracted from the belt of grassy material falling onto the further conveyor belt 70 The tape to which? having been removed, the infill is rewound in the final portion of the conveyor apparatus 35 of the machine 5 for separating the infill, from which it can? be picked up by a forklift.

The infill is then transported, for example by means of respective conveyors to the dryer 75, where the infill is dried, so as not to obstruct the screening machine 125 downstream of the dryer 75, and to remove, by means of suction, the dust and synthetic turf filaments present in the infill. The filaments and the dust are sucked through the second outlet 100 until they impact against the filtering unit 110 and then fall into a pipe from which they arrive in the special container for the dust and the synthetic grass filaments.

The dried and cleaned infill from dust and synthetic grass filaments reaches the screening machine 125 where it meets the first screening grid 140 which prevents the passage of the stones, which are expelled from the screening machine 125 through the first outlet 145 and from there. arrive in their special container.

The infill that passes through the through openings of the first screening grid 140? consisting of sand with a diameter between 100? m and 1400? m mixed with granules of polymeric material with a diameter between 800? m and 2500? m. This granular material reaches the second screening grid 150 which prevents the passage of the polymeric granular material having a diameter approximately greater than 1500 µm (i.e. greater than 1400 µm), which exits from the screening machine 125 through the second outlet 155, and lets pass only the granules of polymeric material and the sand having a diameter between about 100? m and 1400? m.

Through the through openings of the second screening grid 150 this granular material reaches the third screening grid 160 where the sand having a diameter smaller than about 800 µm passes through the through openings and reaches the fourth exit 170 of the screening machine 125, while the material which it does not cross the through openings of the third screening grid 160, composed of granules of polymeric material and sand both having a diameter between about 800? m and 1400? m, reaches the third outlet 165 of the sieving machine 125.

From the third exit 165 the material arrives at the vibrating densimetric table 175 where, thanks to the difference in density? between the two materials, the sand having a diameter between about 800? m and 1400? m and the granules of polymeric material having a diameter between about 800? m and 1400? m are separated from each other and directed towards their respective containers.

So ? the subdivision of the initial infill into its components has been completed.

The installation of the system 1 requires one or two vehicles to transport the first platform 195 and the second transportable platform 200 with the system 1 fixed above it in the place where the synthetic turf belt to be treated is located. The platforms are removed from the vehicles by forklifts and placed on the ground side by side in such a way as to connect the components present on the respective platforms together.

The invention so? conceived? susceptible of numerous modifications and variations, all of which are within the scope of the inventive concept.

Furthermore, all the details can be replaced by other technically equivalent elements. In practice, the materials used, as well as? the contingent shapes and dimensions may be any according to requirements without thereby abandoning the scope of the protection of the following claims.

Claims (11)

CLAIMS 1. Method for recycling the infill of a synthetic turf, said infill being formed by a plurality of synthetic grasses. of different granular materials including at least sand granules having a diameter between 100? m and 1400? m and polymeric material granules with a diameter of between 800? m and 2500? m, said method comprising the following steps: - dry the infill, - screening the previously dried infill through a first screening grid (140) having through openings with a diameter between 2900? m and 3100? m, - direct the infill that does not pass through the first screening grid (140) towards a suitable container, - screening the infill that crosses the first screening grid (140) through a second screening grid (150) having through openings between 1300? m and 1500? m, - direct the infill that does not pass through the second screening grid (150) towards a suitable container, - screening the infill that passes through the second screening grid (150) into a third screening grid (160) having through openings with a diameter between 700? m and 900? m, - separate according to the difference in density? of the materials, for example by means of a vibrating densimetric table (175) or gravimetric separator, in the infill that does not cross the third screening grid (160), the granules of polymeric material from the sand granules and direct them towards respective different containers, - direct the infill that passes through the third screening grid (160) towards a suitable container. 2. A method according to claim 1, wherein the infill also comprises synthetic turf filaments of the synthetic turf belt, and wherein the method comprises the step of, during the drying step, sucking said synthetic turf filaments from the synthetic turf strip. infill and convey them to a suitable container. 3. Infill recycling plant (1), consisting of a plurality of of different granular materials, of a synthetic turf called plant (1) comprising: - a dryer (75) of the fluid bed type equipped with a drying chamber (80) comprising an inlet (85), a first outlet (95) crossed by the dried infill and a second outlet (100) at which? connected a suction unit configured to generate a vacuum inside the drying chamber (80), - a screening machine (125) of the vibrating type equipped with an inlet (130) located downstream of the first outlet (95) of the dryer (75) and which comprises a first screening grid (140) having through openings with a diameter ranging from 2900? M and 3100? M, a first outlet (145) for the granular material that does not pass through the through openings of the first screening grid (140), a second screening grid (150) placed downstream of the first screening grid (140 ) having through openings with a diameter between 1300? m and 1500? m, a second outlet (155) for the granular material that does not pass through the second screening grid (150), a third screening grid (160) placed downstream of the second screening grid (150) and having through openings with a diameter between 700? m and 900? m, a third outlet (165) for the material that does not pass through the third screening grid (160), - a vibrating densimetric table (175) placed downstream of the third outlet (165) of the screening machine (125) equipped with a first outlet (180) and a second outlet (185) and configured to convey towards the first outlet (180) the granular material having density? higher than a preset threshold value and towards the second outlet (185) the granular material having density? lower than the preset threshold value. Plant (1) according to the preceding claim, comprising a removal machine (5) which mechanically removes the infill from the synthetic turf belt and? equipped with an inlet (6) in which the synthetic turf belt is positioned, a first outlet (7) from which the infill removed from the turf belt comes out, and what? connected to the inlet (85) of the dryer (75), and a second outlet (8) from which the belt of synthetic turf, cleaned of the infill, comes out. 5. Plant (1) according to claim 3, wherein the dryer (75) comprises an apparatus (115) for introducing hot gas into a lower portion of the drying chamber (80), a perforated table placed above a portion of the drying chamber (80) into which the introduction apparatus (115) introduces the hot air under pressure, a plurality of of bulkheads placed at a higher level than the perforated table and shaped to direct the flow of gas generated by the inlet apparatus (115) towards the second outlet (100) of the dryer (75), in which the second outlet (100) ? made in a portion of the top? of the drying chamber (80). Plant (1) according to claim 3, comprising a first transportable platform (195) to which? fixed the dryer (75), a second transportable platform (200) to which? fixed to the screening machine (125), a conveyor device (210) equipped with a first end? able to be connected to the first outlet (95) of the dryer (75), a second end able to be connected to the entrance (130) of the screening machine (125), a first coupling device integral with the first platform (195) transportable in which one of the first extremities is and the second extremity? of the conveyor device (210)? pivotally associated in an idle manner to the respective transportable platform System (1) according to claim 6, wherein the first transportable platform (195) and the second transportable platform (200) each comprise a plurality of materials. of hollow seats [made in a lower portion of the platform] to allow the platform to be fixed to the wagon of a vehicle. Plant (1) according to claim 4, wherein the infill removal machine (5) comprises a support frame (10), a conveyor apparatus (35) connected to said support frame (10) and configured for moving the synthetic turf belt through a predefined path along which the infill is removed from the synthetic turf, in which the conveyor apparatus (35) includes a final portion on which the synthetic turf belt is rolled up after removal of the infill, which at least partially defines the second outlet (8) of the removal machine (5) itself and which has a first section (55) and a second section (60) contiguous to form a V, of which the first section ( 55) at one end of it? ? rotatably associated with respect to a hinge axis (C), in an idle way, to the support frame (10) of the filling removal machine (5) and to the opposite end? ? associated with the second section (60), and in which the implant (1) comprises a coupling mechanism configured to fix in a removable way an end? free of the second section (60) to the support frame (10) of the removal machine (5). Plant (1) according to claims 6 and 8, wherein the infill removal machine (5)? fixed to the second transportable platform (200) and in which the final portion of the conveyor apparatus (35)? movable in rotation with respect to the hinge axis (C) between a first position in which the second section (60)? integral by means of the coupling mechanism to the support frame (10) of the machine (5) for removing the infill and the final portion? vertically contained in the horizontal dimensions defined by the second transport platform (200), and a second position, in which the second section (60)? disengaged from the coupling mechanism and the final portion protrudes externally with respect to the horizontal dimensions of the second transport platform (200). 10. Method for separating synthetic grass filaments from an infill containing said filaments, using a fluid bed dryer (75). 11. Method for the separation of rubber granules coming from an infill with a diameter between 800? M and 1400? M from sand granules coming from the same infill with a diameter of between 800? M and 1400? M, using a vibrating densimetric table (175 ).