Separation device for a distribution unit and associated seed drill

Abstract

Separation device for a distribution unit and associated seeder The invention relates to a separation device for a distribution unit (1) of granular elements having a plurality of perforations (2) each having an internal channel with an inlet and an outlet, comprising a separation wheel (6) having an axis of rotation (7) and a peripheral surface (8), the separation wheel (6) having a plurality of radial projections (9) projecting from the peripheral surface (8), which are configured to insert into the internal channel of one of the perforations (2) in an insertion position, characterized in that the radial projections (9) are configured to insert through the inlet of the internal channel of one of the perforations (2) in a sealed manner inside the internal channel by conjugation of shape and / or by means of a sealing element (10) in the insertion position so as to achieve sealing inside the internal channel.Figure to be published with the abbreviation: Fig. 1.

Description

Title of the invention: Separation device for a distribution unit and associated seed drill

[0001] The invention relates to the field of separation devices for a distribution unit and the field of seed drills.

[0002] The invention thus relates more generally to the field of single-seed sowing, also called precision sowing, that is to say, sowing seeds one by one in rows. Single-seed sowing finds its application in the cultivation of maize, beets, soybeans, or similar crops.

[0003] A precision seed drill generally consists of a frame onto which seeding units, most often between 4 and 12 or even more, are mounted using a parallelogram linkage. The spacing between these seeding units varies depending on the crop, preferably between 37.5 centimeters and 80 centimeters, but allows for the formation of clearly distinct rows. For this reason, it is common to refer to this type of planting as row cropping, as opposed to crops such as wheat where the spacing is much smaller.

[0004] In a known manner, a single-seed seed distribution device generally operates in the manner stated below.

[0005] A sealed, two-part housing comprises a perforated distribution disc, preferably driven by a motor, which forms a distribution element for a plurality of granular elements. The distribution disc divides the housing into two chambers with different air pressures, thus creating a pressure difference, which can be positive or negative, on either side of the perforated distribution disc. The housing is connected to a blower that allows the pressure difference to be adjusted according to the type of seed, the feed speed, and other parameters.

[0006] At the bottom of the perforated distribution disc, i.e., at the bottom of the housing, there is a reservoir area for granular elements, for example seeds, which is most often supplied by a hopper. These seeds are in contact with the rotating perforated distribution disc, which, as it rotates, carries the seeds one by one into its perforations.

[0007] The diameter and shape of the perforations in the distribution disc are designed to accommodate a single granular element, for example, a seed. The granular element is held in the perforation by the pressure difference between the two sides of the distribution disc. The perforations are often edged with special shapes, for example, raised and / or recessed, and are These areas around the perforations are commonly called agitators, and are arranged in the distribution disc to guide and / or direct the seeds towards the perforations.

[0008] Once the seeds are distributed into the perforations of the distribution disc, a selection system eliminates excess seeds to prevent duplicates, as several seeds can sometimes end up in a single perforation, which is undesirable. This selection can be achieved using teeth, brushes, or similar fixed devices located outside and / or inside the seed path. As a result, the excess seeds fall back into the reserve area.

[0009] Once the seeds have been selected, they are transported to the final distribution zone, which is generally located in the last quarter turn of the distribution disc, where the pressure difference is eliminated. This absence of pressure difference causes the seed to exit the perforation and the distribution system towards the ground. Seed ejection can be assisted by a roller that reduces the pressure difference and may even push the seed out of the perforation using spikes; the roller thus forms a separation device.

[0010] Publication DE102009043881A1 illustrates such a roulette wheel with a cylindrical base whose top is fitted with a stud surrounded by a flat sealing gasket.

[0011] Publication WO 2022 / 159027A1 illustrates a roulette wheel with pins and a seal surrounding each pin.

[0012] In these publications, the pin is inserted into the perforation with some play, while the seal rests against the disc wall at the perforation inlet without penetrating it. Occasionally, the pressure difference is not interrupted by the pin, and the seed may therefore remain on the disc due to an imperfect seal.

[0013] The present invention aims to overcome at least one of these drawbacks and seeks to propose a solution to improve the efficiency of the pressure difference cut-off by optimizing the sealing.

[0014] To this end, the invention relates to a separation device for a distribution element of a plurality of granular elements,

[0015] the distribution organ being arranged to distribute in a discrete and singular manner a plurality of granular elements and comprising a plurality of perforations each having an internal channel with an inlet and an outlet,

[0016] The separation device comprises at least:

[0017] a separating wheel comprising a rotation axis and a peripheral surface,

[0018] the separation wheel comprising a plurality of radial projections protruding from the peripheral surface, each of the radial projections being configured to fit into the internal channel of one of the perforations in an insertion position,

[0019] The separation device is characterized in that:

[0020] The radial projections are configured to insert through the inlet of the internal channel of one of the perforations in a sealed manner inside the internal channel by conjugation of shape and / or by means of a sealing element in the insertion position so as to achieve sealing inside the internal channel.

[0021] The invention relates to an assembly comprising a separation device for a distribution member of a plurality of granular elements and a distribution member of a plurality of granular elements, the distribution member being arranged to distribute in a discrete and singular manner a plurality of granular elements and having a plurality of perforations comprising an internal channel with an inlet and an outlet, characterized in that the separation device is according to the invention.

[0022] The invention relates to a seed drill comprising at least the assembly including a separation device for a distribution element of a plurality of granular elements and a distribution element of a plurality of granular elements, characterized in that the assembly is according to the invention.

[0023] The invention will be better understood from the following description, which relates to several preferred embodiments, given by way of non-limiting examples, and explained with reference to the accompanying schematic drawings, in which:

[0024] [Fig-1] [Fig.1] represents a perspective view of an assembly comprising a separation device and a distribution element for a plurality of granular elements of a first embodiment according to the invention,

[0025] [Fig.2] [Fig.2] represents a cross-sectional view of a radial projection of the separation device in an internal channel of one of the perforations of the distribution member in an insertion position according to the invention of the assembly of [Fig.1],

[0026] [Fig.3] [Fig.3] represents a perspective view of the separation device according to the invention of the whole of [Fig.1],

[0027] [Fig.4] [Fig.4] represents a cross-sectional view of a radial projection of the separation device according to the invention of the assembly of [Fig.1],

[0028] [Fig.5] [Fig.5] represents a perspective view of the distribution organ of the entire [Fig.1],

[0029] [Fig.6] [Fig.6] represents a cross-sectional view of a projection of the separation device in an internal channel of one of the perforations of the distribution member in an insertion position of an assembly of a second embodiment according to the invention,

[0030] [Fig.7] [Fig.7] represents a partial perspective view of the entire second embodiment according to the invention,

[0031] [Fig.8] [Fig.8] represents a partial perspective view of the entire second embodiment according to the invention,

[0032] [Fig.9] [Fig.9] represents a perspective view of the distribution organ of the entire [Fig.6],

[0033] [Fig. 10] [Fig. 10] represents a perspective view of an assembly comprising a separation device and a distribution element for a plurality of granular elements of a third embodiment according to the invention,

[0034] [Fig. 11] [Fig. 11] represents a perspective view of the separation device according to the invention of the assembly of [Fig. 10],

[0035] [Fig. 12] [Fig. 12] represents a perspective view of an assembly comprising a separation device and a distribution element for a plurality of granular elements of a fourth embodiment according to the invention,

[0036] [Fig. 13] [Fig. 13] represents a perspective view of the separation device according to the invention of the assembly of [Fig. 12], and

[0037] [Fig. 14] [Fig. 14] represents a perspective view of a distribution assembly according to the invention.

[0038] The invention relates to a separation device for a distribution element 1 of a plurality of granular elements,

[0039] the distribution element 1 being arranged to distribute in a discrete and singular manner a plurality of granular elements and comprising a plurality of perforations 2 each having an internal channel 3 with an inlet 4 and an outlet 5,

[0040] The separation device comprises at least:

[0041] - a separating wheel 6 comprising a rotation axis 7 and a surface peripheral 8,

[0042] the separation wheel 6 having a plurality of radial projections 9 protruding from the peripheral surface 8, each of the radial projections 9 being configured to fit into the internal channel 3 of one of the perforations 2 in an insertion position PI.

[0043] According to the invention, the separation device is characterized in that:

[0044] the radial projections 9 are configured to insert through the inlet 4 of the internal channel 3 of one of the perforations 2 in a sealed manner inside the internal channel 3 by conjugation of form and / or by means of a sealing element 10 in the insertion position PI so as to achieve sealing inside the internal channel 3.

[0045] Advantageously, this configuration makes it possible to increase the sealing time of the perforation 2, that is to say, the time during which the perforation 2 remains sealed by the radial projection 9. It follows that the present invention makes it possible to improve the efficiency of the pressure difference cut-off by optimizing The sealing. This solution also has the advantages of being suitable for all types of seeds and not impacting the size of the separation device.

[0046] Preferably, each radial projection 9 has the shape of a circular cylinder with a curved profile or a truncated cone and is configured to fit snugly into the internal channel 3 of complementary shape in the shape of a circular cylinder with a curved profile or a truncated cone by conjugation of shape in the insertion position PI.

[0047] Advantageously, this results in the radial projection 9 having a shape that allows the internal channel 3 to be closed over a larger area in the insertion position PI than in the prior art. The profile of the radial projection 9 is therefore optimized to improve sealing.

[0048] Preferably, each radial projection 9 includes the sealing element 10 configured to be inserted inside the internal channel 3 of the perforation 2 in the insertion position PI.

[0049] Advantageously, the sealing element 10 makes it possible to achieve a seal inside the internal channel 3 and to compensate for any possible play of tolerance between the radial projection 9 and the internal channel 3 in the insertion position PI.

[0050] Preferably, each radial projection 9 in the form of a circular cylinder with a curved profile or a truncated cone has a groove 11 and the sealing element 10 is an O-ring that fits into the groove 11.

[0051] Preferably, each radial projection 9 in the form of a circular cylinder with a curved profile or a truncated cone has a summit 12 preferably flat or convex from which a centering pin 13 is salient, the centering pin 13 is configured to open towards the outlet 5 of the internal channel 3 of the perforation 2 in the insertion position PI.

[0052] Advantageously, the centering pin 13 allows the granular element to be pushed back mechanically and prevented from jamming at the outlet 5.

[0053] Preferably, the peripheral surface 8 comprises at least a first row RI of radial projections 9 configured to fit into a first circular row Cl of perforations 2.

[0054] Advantageously, this possibility is particularly advantageous for a distribution element 1 having one or more circular rows Cl of perforations 2.

[0055] Preferably, the peripheral surface 8 further comprises at least one RDI row of teeth 14 for inserting into a circular row CD1 of guide holes 15, preferably blind.

[0056] Advantageously, at least one row of teeth 4 ensures the continuous rotation of the separating wheel 6 around the axis of rotation 7. This feature is particularly advantageous for a distribution element 1 featuring a limited number of perforations 2, i.e. for example less than thirty perforations 2 on the distribution element 1.

[0057] The invention relates to an assembly comprising a separation device for a distribution member 1 of a plurality of granular elements and a distribution member of a plurality of granular elements, the distribution member being arranged to distribute in a discrete and singular manner a plurality of granular elements and having a plurality of perforations 2 comprising an internal channel 3 with an inlet 4 and an outlet 5, characterized in that the separation device is according to the invention and as described above.

[0058] The invention relates to a seed drill comprising at least the assembly including a separation device for a distribution member 1 of a plurality of granular elements and a distribution member 2 of a plurality of granular elements, characterized in that the assembly is according to the invention as described above.

[0059] The distribution member 1 and the separation device are preferably intended to be part of a distribution assembly 16 which further includes a sealed housing 17 with a fixed part 18 and a movable part in the form of a door 19.

[0060] The distribution element 1 preferably usually comprises a distribution disc perforated by perforations 2 driven in rotation preferably by a motor at the level of a drive shaft 20.

[0061] The distribution disc separates the housing 17 into two chambers, the first chamber and the second chamber, in which the air pressures are preferably different. The first and second chambers preferably have a substantially cylindrical shape. The door 19 preferably receives the distribution disc, but this example is not limiting; the first chamber can receive all or part of the plurality of granular elements, and the second chamber is closed by the door 19, at least in its closed position.

[0062] The perforations 2 are preferably distributed circularly in one or more circular rows Cl, C2 and are spaced apart from each other. The perforations 2 are through perforations.

[0063] Preferably, the first circular row Cl comprises sixty perforations 2.

[0064] Preferably, the second circular row C2 comprises sixty perforations 2.

[0065] The internal channel 3 allows a communication to be created between the first chamber and the second chamber.

[0066] The inlet 4 allows the insertion of the radial projection 9 and is intended to open into the second chamber.

[0067] Outlet 5 is configured to be in contact with a granular element and is intended to open into the first chamber.

[0068] The inlet 4 preferably has a diameter greater than the diameter of the inlet 5.

[0069] The inlet 5 may also include a radial lip 22 allowing the diameter of the outlet 5 to be further reduced. The reduced diameter, however, allows the centering pin 13 to be inserted into the insertion position PL

[0070] Preferably, the radial lip 22 is in contact with the apex 12 at least partially in the insertion position PL

[0071] The separating wheel 6 is preferably mounted for rotation around the axis of rotation 7 on a support 21 which is fixed to the drive shaft 20.

[0072] The rotation axis 7 and the drive axis 20 are preferably intersecting.

[0073] The separation wheel 6 preferably has a diameter smaller than the diameter of the distribution disc.

[0074] The peripheral surface 8 has a width substantially identical to the width of at least one circular row Cl, C2.

[0075] Each radial projection 9 preferably has an axis of revolution which extends a radial direction of the separating wheel 6.

[0076] The radial projections 9 are preferably distributed along at least one row RI on the peripheral surface 8.

[0077] The radial projections 9 are preferably distributed according to a first row RI and a second adjacent row R2 on the peripheral surface 8.

[0078] In this case, preferably the radial projections 9 of the first row RI and of the second row R2 are not aligned side by side but are offset.

[0079] Each radial projection 9 has a height preferably between 5 millimeters and 40 millimeters.

[0080] Each radial projection 9 has a shape complementary to that of the internal channel 3 so that in the insertion position the radial projection 9 and the internal channel 3 are fitted together with or without a tolerance clearance. If a tolerance clearance is present, the sealing element 10 compensates for it.

[0081] The separation wheel 6 preferably has nine radial projections 9.

[0082] The sealing element 10 is preferably made of an elastomer-type material and has an outer diameter between 7 millimeters and 15 millimeters, and a thickness between 2 millimeters and 6 millimeters.

[0083] The sealing element 10 can be, for example, an O-ring.

[0084] The groove 11 preferably has a depth and height between 2 millimeters and 5 millimeters.

[0085] The centering pin 13 preferably has the shape of a stud or a block.

[0086] The centering pin 13 preferably has an outside diameter between 2 millimeters and 10 millimeters, and a height between 1 millimeter and 5 millimeters.

[0087] The teeth 14 are preferably distributed according to a row RDI attached to the first row RI of radial projections 9.

[0088] Preferably, the radial projections 9 of the first row RI and the teeth 14 of the row RDI are not aligned side by side but are offset.

[0089] The separating wheel 6 preferably has six teeth 14.

[0090] Each tooth 14 has, for example, a parallelepiped shape.

[0091] The guide holes 15 are preferably distributed circularly in a circular row CD1.

[0092] Preferably, the circular row CD1 comprises twenty-one guide holes 15.

[0093] The guide holes 15 are preferably through or blind.

[0094] Each tooth 14 has a shape complementary to each guide hole 15 to allow the insertion of the teeth 14 into the guide holes 15.

[0095] The radial lip 22 extends radially in the diameter of the outlet 5 over a length 1 and has a thickness e.

[0096] The radial lip 22 may preferably have a free edge 23 that is beveled and / or rounded and / or flat.

[0097] Figures 1 to 5 illustrate a first variant of the embodiment of the assembly according to the invention.

[0098] Figure 1 illustrates the assembly according to the invention in the first embodiment with the separation device comprising the separation wheel 6 and the distribution member 1 in the form of a distribution disc. In this example, the separation wheel 6 is rotatably mounted by the rotation axis 7 on the support 21, the latter being fixed to the drive shaft 20. The peripheral surface 8 of the separation wheel 6 comprises a single first row RI of radial projections 9. Each radial projection 9 is in the form of a truncated cone and includes a sealing element 10 in the form of an O-ring. A centering pin 13 projects from the apex 12 of the truncated cone. The centering pin 13 is aligned with the axis of revolution of the truncated cone. The distribution member 1 in the form of the distribution disc has a single first circular row Cl of perforations 2.

[0099] Figure 2 illustrates in detail the insertion of a radial projection 9 of the separating wheel into the internal channel 3 of a perforation 2 of the distribution member 1, this position corresponding to the insertion position PL. This figure illustrates more particularly that the sealing element 10, in the form of an O-ring, is inserted into the groove 10. Furthermore, the apex 12 has a domed shape and includes the centering pin 13. The internal channel 3 has a flared, truncated cone shape. The inlet 4 has a diameter greater than the diameter of the outlet 5, which is provided with the radial lip 22. This radial lip 22 is aligned with, or in contact with, the domed surface of the apex 12. Furthermore, the radial lip 22 surrounds the centering pin 13 located at level of outlet 5. The distance d between the radial lever 22 and the centering pin 13 is preferably between 0 and 1.5 millimeters. In this insertion position PI, the radial projection 9 is fitted into the internal channel 3 by the inlet 4 with a tolerance clearance which is taken up by the sealing gasket 10 which is located inside the internal channel 3 and comes into contact with the internal channel 3 to achieve sealing.

[0100] Figure 3 illustrates the separation wheel 6 of the rotary separation device around its axis of rotation 7. The peripheral surface 8 of the separating wheel 6 comprises a single first row RI of radial projections 9. Each radial projection 9 is in the form of a truncated cone and includes a sealing element 10 in the form of an O-ring. A centering pin 13 projects from the apex 12 of the truncated cone. The centering pin 13 is aligned with the axis of revolution of the truncated cone.

[0101] Figure 4 illustrates a radial projection 9 of the separating wheel 6, which has the shape of a truncated cone and includes a sealing element 10 in the form of an O-ring inserted in the groove 11. The centering pin 13 projects from the apex 12 of the truncated cone, the surface of which is convex. The centering pin 13 is aligned with the axis of revolution of the truncated cone.

[0102] Fig. 5 illustrates the distribution element 1 in the form of the distribution disc and having a single first circular row Cl of perforations 2.

[0103] Figures 6 to 9 illustrate a second embodiment of the assembly according to the invention. In this embodiment, the separating wheel 6 is identical to that of the first embodiment; only the distribution element 1 differs, particularly in the shape of the perforations 2.

[0104] [Fig.6] illustrates in detail the insertion of a radial projection 9 of the separating wheel into the internal channel 3 of a perforation 2 of the distribution member 1, this position corresponding to the insertion position PL. As in [Fig.2], the sealing element 10 in the form of an O-ring is inserted into the groove 10 and the apex 12 has a domed shape and includes the centering pin 13. The internal channel 3 has a flared shape of a truncated cone. The inlet 4 has a larger diameter than the outlet 5, which is fitted with the radial lip 22. This radial lip 22 is opposite but not in contact with the convex surface of the apex 12. Furthermore, the radial lip 22 surrounding the centering pin 13 extends less in the radial direction than in the example of the first embodiment illustrated in particular by [Fig. 2]. Indeed, the radial lip 22 has a length 1 shorter than that of the radial lip 22 of [Fig. 2].The distance d between the radial lip 22 and the centering pin 13 is preferably between 1 mm and 5 mm. In this insertion position PI, the radial projection 9 is fitted into the internal channel 3 by the inlet 4 with a tolerance clearance which is taken up by the sealing gasket 10. is positioned inside the internal channel 3 and comes into contact with the internal channel 3 to achieve sealing.

[0105] Figures 7 and 8 partially illustrate the assembly according to the invention in the second embodiment with the separation device comprising the separation wheel 6, identical to that of the first embodiment, and the distribution member 1, which is in the form of a distribution disc, which is different as detailed in [Fig. 6]. Each radial projection 9 is in the form of a truncated cone. The distribution member 1, in the form of the distribution disc, has a single first circular row Cl of perforations 2.

[0106] As shown in [Fig.8], in the insertion position PI, the centering pin 13 is inside the perforation 2 and the radial lip 22 is around the centering pin 13 but at a distance from it.

[0107] Fig. 9 illustrates the distribution element 1 in the form of the distribution disc and having a single first circular row Cl of perforations 2.

[0108] Figures 10 to 11 illustrate a third embodiment of the assembly according to the invention.

[0109] Figure 10 illustrates the assembly according to the invention in the third embodiment with the separation device comprising the separation wheel 6 and the distribution element 1 in the form of a distribution disc. In this example, the separation wheel 6 is mounted for rotation by the rotation axis 7 on the support 21, the latter being fixed to the drive shaft 20. The peripheral surface 8 of the separation wheel 6 comprises a first row RI of radial projections 9 and a second row R2 of radial projections 9. Each radial projection 9 has characteristics identical to those of the first and second embodiments described above. The distribution element 1 in the form of the distribution disc has a first circular row C1 of perforations 2 and a second circular row C2 of perforations 2.

[0110] Figure 11 illustrates the separation wheel 6 of the rotating separation device about its axis of rotation 7. The peripheral surface 8 of the separation wheel 6 comprises a first row RI of radial projections 9 and a second row R2 of radial projections 9. Each radial projection 9 has characteristics identical to those of the first and second variants described previously. The radial projections 9 of the first row RI and the second row R2 are not aligned side by side but are offset.

[0111] Figures 12 to 13 illustrate a fourth embodiment of the assembly according to the invention.

[0112] Figure 12 illustrates the assembly according to the invention in the fourth embodiment with the separation device which includes the separation wheel 6 and The distribution element 1 is in the form of a distribution disc. In this example, the separating wheel 6 is mounted for rotation by the rotation axis 7 on the support 21, the latter being fixed to the drive shaft 20. The peripheral surface 8 of the separating wheel 6 comprises a single first row RI of radial projections 9 and a first row RDI of teeth 14. Each radial projection 9 has characteristics identical to those of the first, second, and third variants described previously. The distribution element 1, in the form of the distribution disc, has a first circular row Cl of perforations 2 and a circular row CD of guide holes 15. The perforations 2 have characteristics identical to those of the first embodiment. The guide holes 15 are blind. The first circular row Cl is located closer to the edge than the circular row CD of guide holes 15.

[0113] Figure 13 illustrates the separation wheel 6 of the rotating separation device about its axis of rotation 7. The peripheral surface 8 of the separation wheel 6 comprises a single first row RI of radial projections 9 and a first row RDI of teeth 14. Each radial projection 9 has characteristics identical to those of the first and second variants described previously. The radial projections 9 of the first row RI and the teeth 14 of the RDI row are not aligned side by side but are offset.

[0114] Fig. 14 illustrates a distribution assembly 16 which includes a sealed housing 17 with the fixed part 18 and the door 19. The distribution member 1 and the separating device which are not visible are located inside the housing 17.

[0115] Of course, the invention is not limited to the embodiments described and shown in the accompanying drawings. Modifications remain possible, particularly with regard to the composition of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

Demands

1. Separation device for a distribution member (1) of a plurality of granular elements, the distribution member (1) being arranged to distribute a plurality of granular elements in a discrete and singular manner and having a plurality of perforations (2) each having an internal channel (3) with an inlet (4) and an outlet (5), the separation device includes at least: - a separation wheel (6) having an axis of rotation (7) and a peripheral surface (8), the separation wheel (6) having a plurality of radial projections (9) projecting from the peripheral surface (8), each of the radial projections (9) being configured to fit into the internal channel (3) of one of the perforations (2) in an insertion position (PI),The separation device is characterized in that: - the radial projections (9) are configured to insert through the inlet (4) of the internal channel (3) of one of the perforations (2) in a hermetic manner inside the internal channel (3) by means of shape combination and / or by means of a sealing element (10) in the insertion position (PI) so as to achieve a seal inside the internal channel (3).

2. Separation device according to claim 1, characterized in that each radial projection (9) has a shape of circular cylinder with curved profile or truncated cone and is configured to fit snugly into the internal channel (3) of complementary shape in the shape of circular cylinder with curved profile or truncated cone by shape conjugation in the insertion position (PI).

3. Separation device according to any one of claims 1 to 2, characterized in that each radial projection (9) comprises the sealing element (10) configured to be inserted inside the internal channel (3) of the perforation (2) in the insertion position (PI).

4. Separation device according to claims 2 and 3, characterized in that each radial projection (9) in the form of a circular cylinder with a curved profile or a truncated cone has a groove (11) and in that that the sealing element (10) is an O-ring that fits into the groove (11).

5. Separation device according to any one of claims 2 to 4, characterized in that each radial projection (9) in the form of a circular cylinder of curved profile or of a truncated cone has a summit (12) preferably flat or convex from which a centering pin (13) is salient, the centering pin (13) is configured to open towards the outlet (5) of the internal channel (3) of the perforation (2) in the insertion position (PI).

6. Separation device according to any one of claims 1 to 5, characterized in that the peripheral surface (8) comprises at least a first row (RI) of radial projections (9) configured to fit into a first circular row (Cl) of perforations (2).

7. Separation device according to claim 6, characterized in that the peripheral surface (8) further comprises at least one row (RDI) of teeth (14) for inserting into a circular row (CD1) of guide holes (15), preferably blind.

8. Assembly comprising a separation device for a distribution member (1) of a plurality of granular elements and a distribution member of a plurality of granular elements, the distribution member being arranged to distribute in a discrete and singular manner a plurality of granular elements and having a plurality of perforations (2) comprising an internal channel (3) with an inlet (4) and an outlet (5), characterized in that the separation device is according to any one of claims 1 to 7.

9. Seed drill comprising at least the assembly including a separation device for a distribution member (1) of a plurality of granular elements and a distribution member (2) of a plurality of granular elements, characterized in that the assembly is according to claim 8.

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