BE1030871B1 - Sleeve for coring head, and corresponding coring head - Google Patents

Abstract

The invention relates to a coring head sleeve (1) for separating inflorescence cabbages into pieces. The sleeve (1) is intended to be positioned around a drilling means of the coring head and comprises a core drilling dip tube (2) for the coring head. The sleeve (1) comprises at least one radial projection (4) mounted on an external side surface (2b) of said tube (2) and extending in a radial direction perpendicular to the external side surface (2b) of said tube. Said radial projection (4) has a profile with a leading edge (4a). Said radial projection (4) has, in projection on a plane transverse to the axial direction of the sleeve, a thickness greater than or equal to 3mm. The invention also relates to a coring head, and an agricultural machine, comprising such a sleeve (1).

Description

ae BE2023/5734

Description

Title of the invention: Sleeve for coring head, and corresponding coring head

Technical area

The present invention relates to the field of machines for processing agricultural products, such as vegetables. The invention relates more specifically to the field of machines for processing, or transforming, cauliflower, broccoli, Romanesco cabbage and other equivalent vegetables.

Prior art

[0002]Generally, in a vegetable such as a head of cauliflower, romanesco cabbage or broccoli, we only eat the inflorescence, called the head or apple, made up of florets. The core, sometimes called heart, is removed during topping, as are the leaves which are removed by topping.

[0003]In particular, in the marketing of such frozen vegetables, it is mainly the inflorescences, called florets, which are of interest, the core being inedible. It is therefore preferable to remove the core when processing or processing such vegetables.

[0004] Frozen meal manufacturers want to be able to have very large quantities of florets ready to cook, that is to say florets of a sufficiently small size to be cooked. We are talking, for example, about bursting cauliflower heads into florets.

[0005]It is already known to carry out the coring and cutting of cauliflower or broccoli florets.

[0006]Document EP 1 462 012 describes a machine for trimming cauliflowers and cutting into florets. In this prior device, an endless belt carries cauliflower support cups and brings them to the right of a trimming head mounted on a vertical rotating plate. Two trimming heads are for example mounted on said turntable whose movement is synchronous with the movement of the cup conveying belt. Each 9/96 head includes a rotating shaft mounted in a coring sleeve, and elements configured to suck up the coring residue thus formed.

[0007]Radial projections can also be provided around the periphery of the sleeve, in order to cut the vegetable into a star shape, simultaneously with the coring.

[0008] However, such projections act like knives which descend through the cabbage during strangling. These knives cut practically all the florets along the entire height of the cabbage. However, the florets located at the base of the cabbage are significantly larger than those located higher up on the core.

[0009]Moreover, the flowers thus obtained then have flat and smooth edges, obtained by cutting, and no longer their original flower shape, which is not satisfactory from a texture point of view, particularly in mouth, for the final consumer or for the aesthetic enhancement and presentation of the final product.

Presentation of the invention

[0010]The present invention aims to resolve the various technical problems stated previously. In particular, the present invention aims to provide a topping head making it possible to top off inflorescence cabbages to obtain florets. More precisely, the present invention aims to propose a coring head sleeve, making it possible to limit the impact of the mechanization of coring on the shape of the florets obtained.

[0011]Thus, according to one aspect, a coring head sleeve is proposed for separating into pieces, preferably into florets, cabbages with inflorescences, such as cauliflowers, Romanesco cabbages or broccoli. The sleeve is intended to be positioned around a drilling means, for example a rotating shaft, of the coring head and comprises a coring plunger tube for the coring head. The sleeve comprises at least one radial projection mounted on an external side surface of said tube and extending in a radial direction perpendicular to the external side surface of said tube. Said PE2023/5734 radial projection comprises, in a cross section to the radial direction of said projection, a profile with a leading edge. Said radial projection has, in projection on a plane transverse to the axial direction of the tube, a thickness, in particular maximum, greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably 8mm.

[0012]Thus, the projections according to the present invention have a thickness of at least 3mm in projection on the plane transverse to the direction of the tube, which means that the radial projections come into contact with the inflorescence cabbage with an apparent thickness at least 3mm, which limits the cutting of the inflorescence cabbage, that is to say the formation of a flat and smooth edge on one side of the flower(s), but on the contrary allows it to press locally on the inflorescence cabbage to create bursting forces in the cabbage. We then obtain a bursting of the cabbage with inflorescence at the level of the fragile zones of the cabbage, that is to say at the level of the interfaces between florets: the florets are then separated from each other, at the level of said interfaces, leading to the obtaining individual florets of natural shape.

[0013]The radial projections of the sleeve according to the present invention are therefore configured to be non-sharp. On the contrary, the radial projections are configured to burst the cabbage by inserting bulky elements into the cabbage, in order to break the connections between cabbage florets, which are weaker than the connections within the florets.

[0014]The sleeve according to the present invention therefore makes it possible to obtain separate florets having natural shapes, corresponding substantially to their shape within the cabbage, and not florets with one or more flat and smooth sides corresponding to cutouts.

[0015]Preferably, said thickness greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably 8mm, is located, according to said cross section in the radial direction of said projection, at a distance less than or equal to 20mm from said leading edge, preferably less than or equal to 14mm, preferably less than or equal to 7mm and more PE2023/5734 preferably less than or equal to 2mm.

[0016]The sleeve is in particular configured to present, at the level of the radial projections, a thickness near the leading edge of the radial projection which is greater than 3 mm. In other words, the radial projections enter directly into the inflorescence cabbage through their thick part, to force it mechanically and make it burst. The distance between the leading edge and the thick part of the radial projection is therefore short, allowing in particular the thick part of the radial projection, during the bursting of the cabbage, to move up to a certain depth in the cabbage, to separate it into florets up to the head.

[0017] According to one embodiment, said at least one radial projection has, in a cross section in the radial direction of said projection, a bulge at the leading edge, the thickness greater than or equal to 3 mm, preferably at 4mm, preferably at 6mm and more preferably at 8mm from said projection being obtained at the level of said bulge.

[0018]The bulge, or thick part, of the radial projection is provided at the level of the leading edge of the radial projection. The radial projection therefore comes into contact with the cabbage to be burst directly through its thick part.

[0019] According to another embodiment, said at least one radial projection is devoid of bulge.

[0020]In such an embodiment, the radial projection can then have a substantially constant thickness over its entire length, said thickness of the radial projection then being greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably at 8mm.

[0021]Preferably, said projection has a convex leading edge, for example rounded, or else a leading edge in the form of an edge having an angle greater than 40°, preferably greater than 60° and more preferably greater than 80°.

[0022]Even if the radial projection comes into contact with the cabbage through its thick part 70145194 the leading edge of the radial projection is not a flat surface, which could create too localized stresses in the cabbage, and therefore damage it, but on the contrary has a leading edge of rounded or pointed shape, in order to facilitate the bringing into contact of the thick part of the radial projection with the cabbage.

In particular, in the case of a leading edge in the form of a ridge, the angle of the ridge is chosen so as to create a constraint, and not to cut the cabbage, in particular thanks to an angle greater than or equal to at 40°,

[0023]Preferably, said leading edge of said radial projection is formed by an edge of a cylinder with a square base, for example a cylinder with a square base of 3mm, preferably of 4mm side, 6mm side or 8mm side.

[0024]An example of a bulge, or thick part, of a radial projection can be obtained from a cylinder with a square base positioned at the head of the projection, that is to say on the leading edge, with the axis of the cylinder extending in the radial direction of the projection, and oriented so as to present, at the level of the leading edge, an edge of the cylinder, and not a face. Such an embodiment therefore makes it possible to have the thick part of the radial projection at the level of the leading edge, and to have a leading edge in the form of an edge having an angle of 90°, Such geometry allows gentle insertion into the cabbage while quickly creating constraints between florets because of the bulk due to the thickness of the square-based cylinder.

[0025]Preferably, said projection has a general wing shape extending substantially in a plane comprising the axial direction of the tube and the radial direction of said radial projection.

[0026]The radial projection can also extend along the axial direction of the coring tube, that is to say also extend to the rear of the thick part. Thus, in a plane transverse to the radial direction of the projection, the projection has a longitudinal shape, along the axial direction of the coring tube.

[0027]Preferably, said radial projection has a profile with a trailing edge and comprises a plate extending between the leading edge and the trailing edge.

[0028] According to one embodiment, said radial projection has a profile with a trailing edge and comprises a plate extending between the bulge present at the leading edge, and the trailing edge.

Still along a plane transverse to the radial direction of the projection, the projection has a profile with a leading edge and a trailing edge. In addition, the projection comprises, between the bulge of the projection and the rear part, a plate. Such a plate makes it possible in particular to provide mechanical support to the bulge of the projection. Indeed, the projection extending transversely from the external surface of the coring tube, the bulge would only hold at one proximal end on the coring tube, without the rest of the projection. Thanks to the plate, the forces exerted by the cabbage on the bulge, in particular those at the distal end of the bulge which result in a significant torque at the proximal end due to the length of the bulge, are also supported by the plate mounted between the bulge and the rest of the coring tube.

[0030] According to another embodiment, the radial projection can be devoid of bulge, and be formed solely by a plate having a thickness greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably 8mm.

[0031]Preferably, the coring head sleeve comprises at least three radial projections uniformly distributed around the periphery of the external lateral surface of said tube, preferably at least four radial projections, and more preferably at least six radial projections.

[0032]The number of radial projections provided in the sleeve depends on the size of the coring tube, and the size of the florets to be separated. Thus, depending on the type of cabbage, or depending on the size of the cabbage, the number of radial projections of the sleeve can be modified or adapted so as to obtain the desired separation of the florets.

; ; , A , BE2023/5734

[0033] According to another aspect, there is also proposed a coring head comprising a rotating shaft arranged in a sleeve as described above.

[0034] Such a coring head therefore makes it possible to both corm the cabbage and separate the different florets, while retaining their natural aesthetic appearance.

[0035] According to another aspect, an agricultural machine is also proposed for processing cabbage, comprising at least one coring head as described above.

[0036]Such an agricultural machine may in particular include a conveyor for recovering the harvested cabbages and then bringing them to a processing system comprising a trimming head, preferably several trimming heads, such as described previously, for trimming and separate said cabbages transported by the conveyor into florets.

Brief description of the drawings

[0037][Fig. 1] Figure 1 shows a perspective view of a sleeve for a coring head, according to the present invention;

[0038][Fig. 2] Figure 2 represents, in front view, the sleeve illustrated in Figure 1,

[0039][Fig. 3] Figure 3 represents, in side view, the sleeve illustrated in Figure 1,

[0040][Fig. 4] Figure 4 represents, in perspective, a first embodiment of a coring head comprising a sleeve according to the present invention, and

[0041][Fig. 5] Figure 5 represents, in perspective, a second embodiment of a coring head comprising a sleeve according to the present invention.

Description of embodiments

[0042] Figures 1, 2 and 3 represent different views of a sleeve 1 for a 7079/5736 coring head, according to the present invention. The sleeve 1 is intended to equip a head for trimming cabbages with inflorescences, in order to recover pieces, and more particularly the florets. The cabbages with inflorescences which can thus be treated by such a sleeve, may include in particular cauliflowers, romanesco cabbages or even broccoli, without however being limited to such examples of cabbages with inflorescences. For this purpose, the sleeve 2, which treats the inflorescence cabbage from the underside of the inflorescence cabbage, that is to say from the side of the inflorescence cabbage presenting the stem, is configured to, on the one hand , core the core to allow its elimination, and on the other hand separate the florets from each other.

The sleeve 1 comprises a core drilling plunger tube 2, and radial projections 4 mounted on the tube 2.

[0044]The coring tube 2 is intended on the one hand to cut the core of the inflorescence cabbage in order to separate it from the florets, and on the other hand to surround a drilling means of the coring head which comes to drill said core during the insertion of the coring tube 2 into the inflorescence cabbage.

[0045]The coring tube 2 therefore has an end, or edge, 2a which is sharp in order to facilitate entry into the inflorescence cabbage. On the other hand, the coring tube 2 advantageously has a cylindrical shape with a circular base and axial direction À (see Figure 2), in order to effectively surround a rotating drilling means, such as a helical projection mounted on a shaft rotating around said axial direction A, as will be described later. The edge 2a is then a sharp circular edge making it possible to make a tubular cut around the stem and the core, to separate them from the florets, but without necessarily crossing the entire cabbage, so as not to alter the floret(s) located at the top of the cabbage, that is to say opposite the base of the cabbage. In order to completely separate the rest of the cabbage and eliminate the tubular portion cut by the coring tube 2, said tubular portion is cut and evacuated by the rotary drilling means.

[0046]The coring tube 2 also has an external lateral surface 2b PE2023/5734 on which the radial projections 4 are mounted. The radial projections 4 are advantageously distributed uniformly over the entire periphery of the external lateral surface 2b, so as to obtain uniform separation of florets.

Furthermore, the number of radial projections 4 present in the sleeve may be greater than or equal to 4, preferably 6, more preferably 8, 10 or 12.

In particular, the number of radial projections can be chosen as a function of the type of inflorescence cabbage to be treated, the size of the inflorescence cabbages to be treated and/or the diameter of the coring tube 2.

[0047]The radial projections 4 are intended to separate the florets from each other. In particular, and in order to keep the florets with their original shape and not cut flat sides, the radial projections 4 are configured to create constraint forces in the florets, in order to break the most fragile connections initially, namely the connections between florets.

[0048]The radial projections have, in a conventional manner, a general wing profile, with a leading edge 4a, a trailing edge 4b and a plate 4c connecting the leading edge 4a to the trailing edge 4b. The leading edge 4a is mounted so as to face the cabbage when cored and so as to be the first part of the radial projection 4 to contact the cabbage when cored. The plate 4c is preferably planar, and extends in a plane passing through the axial direction A of the tube 2 and comprising the radial direction of said radial projection 4. In other words, the plate 4c, and therefore the radial projection 4, s extends according to the direction of movement of the sleeve 1 in the cabbage during coring. The plate 4c is in particular fixed to the external lateral surface 2b of the coring tube 2, between the leading edge 4a and the trailing edge 4b. The plate 4c makes it possible in particular to give the radial projection 4 a reinforced mechanical strength, in particular at the level of the leading edge 4a which undergoes folding forces of said leading edge 4a along the external lateral surface 2b during the bursting the cabbage into florets, and in particular when the radial projection 4 has a bulge as described below, at the level of said leading edge 4a.

[0049]Each radial projection 4 thus comprises, at the level of its leading edge 4a PE2023/5734 through which it comes into contact with the inflorescence cabbage, a bulge 6 intended to create, by bulk effect, said constraints of separation of the flowers, while limiting sharp and clean cuts. The bulge 6 can for example be obtained with any shape leading to an enlargement of the thickness of the radial projection 4, and in particular leading to a radial projection 4 whose thickness increases from the leading edge 4a to 'to the bulge 6, and in particular up to the maximum thickness of the bulge 6. The bulge 6 can be mounted at the level of the leading edge 4a of the radial projection 4, or at a distance, but nevertheless close to the edge attack 4a of the radial projection 4.

[0050]Whether the bulge 6 is mounted at the leading edge 4a of the radial projection 4 or at a distance from said leading edge 4a, the leading edge 4a can be convex, for example rounded, or shaped edge having an angle greater than 40°, preferably greater than 60° and more preferably greater than 80°. Such a leading edge 4a makes it possible in particular, even if the bulge 6 is located at a distance from it, to limit the cutting effect of the radial projection 4, and to increase the creation of a bursting stress.

[0051] For example, the bulge 6 can thus be formed by a cylinder with a square base, mounted on the external lateral surface 2b in the radial direction of the coring tube 2, and oriented so that an edge of the cylinder at square base forms the leading edge 4a of the radial projection 4.

The cylinder of the bulge 6 can for example comprise a square base of 3mm, 4mm side, 6mm side or 8mm side. In particular, the size of the bulge 6 can be chosen according to the nature and/or size of the inflorescence cabbages to be treated.

[0053]The shape and orientation of the cylinder with a square base forming the bulge 6 are chosen to limit both the risks of crushing, which would be obtained with an orientation exposing one face of the cylinder as the leading edge, and the risks of cutting, which would be obtained with too fine a bulge.

[0054] For this purpose, and as illustrated in Figure 2, each bulge 6 has a thickness E, in the present case a maximum thickness E, seen from the face of the inflorescence cabbage treated by the sleeve 1, which is greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably 8mm.

[0055]In other words, the projection of a radial projection 4 in a plane P perpendicular to the axial direction A of the coring tube 2, has a thickness E which is greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably at 8mm. This thickness E corresponds to the thickness of the bulge 6 of the radial projection 4.

[0056] Furthermore, such a thickness E, which can be located at a distance from the leading edge 4a of the radial projection 4, remains close to the leading edge 4a of the radial projection 4, for example at a distance D less than or equal to 20mm, or even 14mm, 7mm or 2mm.

[0057]For example, in the case of a bulge 6 in the form of a cylinder with a square base of 6mm side, the thickness E obtained by projection in the projection plane P is then approximately equal to 8.48mm . Furthermore, such a thickness E is at a distance D of approximately 4.24 mm from the leading edge 4a of the radial projection 4. We thus obtain a radial projection 4 making it possible to create a bursting constraint of the inflorescence cabbage , without crushing or cutting the florets during strangling. Furthermore, the leading edge 4a of the radial projection 4 is formed by an edge of said cylinder with a square base, that is to say by an edge having an angle of 90°. Preferably, the edge of the bulge 6 forming the leading edge 4a of the radial projection can be blunted, that is to say rounded, to limit the risk of cutting the cabbage with inflorescences during strangling.

[0058] According to another embodiment not illustrated in the figures, the radial projections can each be formed solely by a plate having a thickness greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably at 8mm. The leading edge of the radial projection can also be beveled. The leading edge of the radial projection can in particular be formed by a beveled edge of the plate, for example by a PE2023/5734 beveled edge forming an edge with an angle of 90°. Preferably, the edge forming the leading edge of the radial projection can be blunted, that is to say rounded, to limit the risk of cutting the cabbage with inflorescence during strangling.

[0059] Figure 4 illustrates a coring head 8 comprising in particular a sleeve 1 as described above, a drilling means 10 and a frame 12 on which the sleeve 1 and the drilling means 10 are mounted. For example, the sleeve 1 can be mounted reversibly, on the frame 12, by fixing means 13, for example screws or studs cooperating with threaded holes of the frame 12.

[0060]The drilling means 10 is positioned in the coring tube 2 of the sleeve 1. The drilling means 10 comprises in particular a rotating shaft 14 positioned in the axial direction A of the coring tube 2, on which is mounted a drilling element. drilling, in this case a helical projection 16 preferably sharp. The drilling means 10 is intended to drill and remove the core of the inflorescence cabbage at the same time as it is separated from the florets by the edge 2a of the coring tube 2.

[0061]For this purpose, the drilling means 10 comprises or is connected to a drive means 18, for example a motor or a pulley intended to cooperate with a belt, mounted in the axial direction À and making it possible to rotate the shaft 14 and, consequently, the helical projection 16.

[0062] Conventionally and known to those skilled in the art, the frame 12 can comprise a housing 12a communicating on the one hand with the core drilling tube 2 of the sleeve 1, and on the other hand with an opening 12b, for example lower, of the frame 12. The housing 12a is thus positioned between the sleeve 1 and the drive means 18, and is therefore crossed by the rotating shaft 14. The core chips drilled by the helical projection 16 are thus conveyed by said helical projection 16 towards the housing 12a of the frame 12 in order to be evacuated towards [opening 12b.

[0063]The drilling means 10 can also comprise, at the level of the housing 2923/9794 12a of the frame 12, radial fins (not shown) arranged between the sleeve 1 and the drive means 18. Such radial fins have in particular for the purpose of facilitating the routing of the core shavings from the helical projection 16 to the opening 12b of the frame 12.

[0064]The frame 12 finally comprises fixing means 12c, for example a plate with holes, allowing it to be fixed, for example by screwing or bolting, on a turntable (not shown). The turntable can in particular be part of an agricultural machine, and include several trimming heads 8 as described previously.

[0065] Figure 5 illustrates a second embodiment of a coring head 8' comprising a sleeve 1 as described previously. In this second embodiment, the elements identical to the trimming head 8 illustrated in Figure 4 are designated by the same references.

[0066]The coring head 8’ is identical to the coring head 8 illustrated in Figure 4, with the difference that it also includes a system for positioning and holding the inflorescence cabbage during its processing.

[0067]Such a system, which is optional and which can be added or not to the coring head 8 illustrated in Figure 4, comprises in particular a counter-plate 20 intended to rest on the exposed surface of the cabbage with inflorescence to be treated. The cabbage to be treated is therefore held between the cup (not shown) on which it is placed and the counter-plate 20 which rests on it at the start and throughout the duration of the treatment by the sleeve 1, this is - that is to say at the beginning and throughout the duration of the strangling and separation into florets.

[0068]Thus, the counter-plate 20 is slidably mounted substantially in the axial direction A so as to remain substantially in the same position during the translation of the sleeve 1 in the inflorescence cabbage. The counter-plate 20 is thus connected to the frame 12 by a set of links 22 and by an elastic return means 24, for example a spring, allowing the counter-plate 20 to apply a substantially constant holding force on the cabbage to BE2029/5734 treated inflorescence, during the insertion and removal of the sleeve 1 in said cabbage.

[0069]Thus, thanks to the sleeve according to the present invention, it becomes possible to process in an automated and rapid manner, cabbages with inflorescences by removing the central core, and by separating the florets from each other without cutting them. In particular, the number, spacing and shape of the radial projections, in particular the swelling of the radial projections, can be modified and adapted to the size or nature of the cabbages to be treated, in order to obtain the desired florets. Such a sleeve has the particular advantage of being compatible with previous coring heads, therefore allowing a simple and rapid upgrade of current coring heads, in order to obtain the beneficial effect sought on the geometry of the florets.

Claims (1)

Claims BE2029/5794 [Claim 1] Sleeve (1) of coring head for separating into pieces, preferably into florets, cabbages with inflorescences, such as cauliflowers, romanesco cabbages or broccoli, the sleeve (1) being intended to be positioned around a drilling means (10), for example a rotating shaft (14), of the coring head (8.8%) and comprising a core drilling dip tube (2) for the coring head necking, characterized in that the sleeve (1) comprises at least one radial projection (4) mounted on an external lateral surface (2b) of said tube (2) and extending in a radial direction perpendicular to the external lateral surface (2b ) of said tube (2), said radial projection (4) comprising, in a section transverse to the radial direction of said projection, a profile with a leading edge (4a), and said radial projection (4) having, in projection on a plane (P) transverse to the axial direction (A) of the tube (2), a thickness (E), in particular maximum, greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably 8mm. [Claim 2] Sleeve (1) of a coring head according to the preceding claim, in which said thickness (E) greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably 8mm, is located, according to said cross section in the radial direction of said projection, at a distance less than or equal to 20mm from said leading edge (4a), preferably less than or equal to 14mm, preferably less than or equal to 7mm and more preferably less than or equal to 2mm. [Claim 3] Collaring head sleeve (1) according to claim 1 or 2, wherein said at least one radial projection (4) has, in a section transverse to the radial direction of said projection, a bulge (6) at the level of the leading edge (4a), the thickness (E) greater than or equal to 3mm, preferably 4mm, preferably 6mm and more preferably 8mm of 2929/9794 said projection being obtained at the level of said bulge ( 6). [Claim 4] Sleeve (1) of a coring head according to any one of the preceding claims, in which said projection (4) has a convex leading edge (4a), for example rounded, or else an edge of attack (4a) in the form of an edge having an angle greater than 40°, preferably greater than 60° and more preferably greater than 80°. [Claim 5] Throating head sleeve (1) according to any one of the preceding claims, wherein said leading edge (4a) of said radial projection (4) is formed by an edge of a base cylinder square, for example a cylinder with a square base of 3mm, 4mm side, 6mm side or 8mm side. [Claim 6] Trimming head sleeve (1) according to any one of the preceding claims, wherein said projection (4) has a general wing shape extending substantially in a plane comprising the axial direction (A) of the tube and the radial direction of said radial projection (4). [Claim 7] Throating head sleeve (1) according to claims 3 and 6, wherein said radial projection (4) has a profile with a trailing edge (4b) and comprises a plate (4c) extending between the bulge (6) present at the leading edge (4a), and the trailing edge (4b). [Claim 8] Sleeve (1) of a coring head according to any one of the preceding claims, comprising at least three radial projections (4) distributed uniformly around the periphery of the external lateral surface (2b) of said tube (2), preferably at least four radial projections (4), and more preferably at least six radial projections (4). me a z BE2023/5734 [Claim 9] Throttle head (8, 8') comprising a rotating shaft (14) arranged in a sleeve (1) according to any one of the preceding claims. [Claim 10] Agricultural machine for processing cabbage, comprising at least one coring head (8, 8’) according to the preceding claim.