SE1551237A1 - Spridningsmaskin - Google Patents

Description

10 15 20 25 30 spreader head more grains leave than other at outlets. A like result is achieved if the spreading material at the end of the riser tube is not distributed uniformly over the riser tube cross section. ln order to avoid such non- uniformity of distribution over the cross section of the riser tube, various measures have already been proposed.

According to document DE 195 23 841 A1 uniformity of distribution of material can be maintained even when driving on slopes, in that the seed airflow is concentrated to the center of the riser tube and hits deflecting surface of the spreader head as a concentrated jet. To this end, a nozzle can be arranged at the upper outlet of the riser tube, and further down in the riser tube a drop shaped deflecting member be centrally provided in the riser tube, coaxially to the longitudinal central axis of the riser tube. Through this teardrop shaped displacement member pooling of seed airflow is to be achieved, which downstream, i.e. above the deflecting member, is to converge towards the central axis and thus to concentrate the grains toward the center.

However, such an arrangement leads to a relatively large riser tube length. On the other hand it has been shown in practice that the spreader head still responds critically if seed at the lower end of the riser tube is fed from the side and if the riser tube is not sufficiently long.

Documents DE 10 2010 036 974, DE 10 2009 003 791 A1 and DE 10 2010 036 975 A 1 try to compensate or mitigate the negative effects of lateral or oblique feeding of spreading material at the lower end of the riser tube by providing a doubly curved or slightly S-shaped deflection curve in a transition region between a lying down supply line and an upright riser tube, wherein the curve is to swirl the spreading material and to evenly distribute it in the riser tube. Such multiply curved and bent deflection curves between a supply line and the riser tube require lots of space and lead to a great height of the spreader head, which means it has to be located relatively far above the supply line in order to provide sufficient length to the riser tube.

Document DE 198 14 030 C1 is trying to improve the distribution of the material in a riser tube by giving the deflection curve between a lying down supply line and an upright riser tube a substantially rectangular cross section, 10 15 20 25 30 while the riser tube has a known Circular cross section and further is shaped like a corrugated tube. However, this prior art solution requires a complex transition between rectanguiar and circuiar cross sectionai shapes, which is reflected in expensive construction costs. Further, the corrugated tube form brings about relatively high flow losses, so that one has to use high air volumes and pressures to feed the spreading material with the necessary speed into the spreader head. ln DE 22 56 939 one suggests provision of guide vanes in a deflection knee between a lying down supply line and an upright riser tube, wherein these vanes divide the deflection curve into a fan shape and are to prevent that spreading material is unilaterally collected in the riser tube due to curve centrifugal forces.

Documents DE 10 2005 044 571 A1 and DE 10 2009 006 682 A1 strive to achieve a uniform, centrally centered delivery of seed to an impact surface of a spreader head even when driving on a slanting slope in that the riser tube can be tilted in order to compensate for the slope. To this end, an inclination sensor is provided which detects the inclination of the machine or indicates the orientation of a plumb line in order to align the riser tube exactly perpendicular regardless of machine inclination. However, such an approach does not deal with the problems of oblique or lateral spreading material feeding to the riser tube.

The object of the present invention is to provide an improved agricultural spreader of the type mentioned, which avoids the disadvantages of the prior art and further develops the latter in an advantageous manner. ln particular, even when obliquely feeding spreading material into the riser tube a uniform distribution of material or an evenly distributed supply of material into the spreader head is to be achieved without having to sacrifice a short riser tube length and a compact design of the spreader head or having to accept excessive flow losses.

According to the invention this object is achieved by an agricultural spreader according to claim. 1 Preferred embodiments of the invention are subject of the dependent claims. 10 15 20 25 30 lt is also proposed to allow an oblique introduction of spreading material into the riser tube, which means there is a tendency of spreading material to collect on the outside of the curve, but to compensate for that in the riser tube. According to the invention the flow guide surface of the de?ecting member in the riser tube on a side of the supply line facing away from the riser tube forms a portion of the inner surface of the riser tube and is drawn inwardly in the rise direction, so that a longitudinal central axis of the riser tube in the region of the deflecting member with respect to a cental perpendicular axis of the spreader head and/ or with respect to the longitudinal central axis of a riser tube portion above the deflecting member is offset to the side of the supply line. Stated conversely, the spreader head and the portion of the riser tube, which is constricted relative to the longitudinal center axis by the deflecting member and is located between the deflecting member and the spreader head, is offset to some extent, namely to the side facing away from the supply line, so that an off center concentration of spreading material is as it were compensated for in a lower portion of the riser tube, in that the longitudinal central axis of the upper end portion of the riser tube is displaced accordingly in relation to the longitudinal center axis in the region of the deflecting member. The flow guide surface of the deflecting member connects to surface portion of the riser tube facing away from one of the supply line in order to capture the spreading material concentrating at that place, and comprises when seen in an ascending direction a contour that pushes or guides the rising spreading material back to the center of the riser tube.

The flow guide surface may for example comprise a flattened portion and /or indentation of the riser tube on the side of riser tube side opposite to or facing away from the feeder line, so that the riser tube portion on said side facing away tapering or constricted.

Advantageously, said flow guide surface may also comprise lateral web or vane portions and /or an overall groove shaped or bowl shaped contour, wherein the groove width or the transverse extent of the bowl is smaller than the diameter of the riser tube. ln other words, the flow guide surface may be contoured such that the spreading material is not only 10 15 20 25 30 captured laterally and /or de?ected and /or directed on the side of the riser tube facing away from the feeder line, but also in directions toward the longitudinal center plane through the riser tube and the feeder line.

Such lateral vane portions of the flow guide surface may according to the invention advantageousiy between them define a channel that tapers toward the top. Accordingly, the spreading material can be deflected or distracted multi axially on its way up through the riser tube, namely on the one hand back to the supply line and on the other transversely thereto from both sides of the riser tube toward the center of the riser tube.

Said vane portions may peripherally be connected to the bottom of the flow guide surface and be associated therewith, so that the flow guide means when viewed in cross section approximately can be U-shaped.

Although a roughly spoken half shell shaped or viewed in cross section a sector like construction of the flow guide surface may be sufficient, according to an alternative embodiment of the invention a more than half shell shaped, in particular a ring shaped, closed contour of the flow guide surface may be provided. For example, as a deflecting member a pipe socket shaped or sleeve shaped deflecting member may be inserted in the riser tube, which at least at its downstream end has a smaller diameter than the riser tube and advantageousiy with its inlet side end portion can adjoin the inner surface the riser tube or nestle to it, in particular on a riser tube side, which faces away from the feeder line. This allows the sleeve shaped deflecting member to catch spreading material concentrating on this facing away side. ln a further embodiment of the invention said sleeve shaped deflecting member may on an inlet side have a smaller diameter than the riser tube, wherein in that case, especially on a feeder line side of the riser tube, a gap may remain between the deflecting member and the inner surface the riser tube.

Advantageously, the sleeve shaped deflecting member body may be shaped like a cone and /or have a cross section tapering in particular upwardly toward an outlet side end, wherein preferably a uniform, continuous cross sectional taper can be provided to achieve a harmonic deflection of spreading material with a nozzle effect. 10 15 20 25 30 Regardless of the specific shape or contour of the deflecting member and the flow guide surface, the deflecting member may be designed to be adjustable in order to adjust the deflection of spreading material flowing through the riser tube and / or the deflection effect of different spreading material. The adjustability of the deflecting member can be designed differently. For example, the deflecting member may be axially movable in the riser tube or be fixed at various positions in order to provide the diversion either at a lower or higher place in the riser tube. Alternatively or additionally, the deflecting member may be designed adjustable with respect to its jet action, in particular such that the cross sectional taper in the rising direction can be adjusted heavier or lighter, for example by setting said lateral flow guide vanes more or less convergent or in terms of their converging angle. ln particular, the deflecting member may be designed to be adjustable with respect to the angular position of the flow guide surface, wherein in particular the angle of attack of the flow guide surface on the riser tube side facing away from the supply line may be varied in relation to the central perpendicular axis of the spreader head and /or in relation to the longitudinal central axis of the riser tube. Such an adjustability of the angle of the flow guide surface can be achieved for example by means of a tiltable suspension or articulation of the deflecting member. Specifically, the de?ecting member may be mounted tiltable about a tilting axis, wherein said tilting axis advantageously may extend transverse to a longitudinal center plane which passes through the riser tube and the supply line. ln order to ensure capture of spreading material accumulating on the outside of the curve or facing away from the feed side even at different angles of attack of the flow guide surface, according to an embodiment of the invention said tilting axis may be provided in the area of an inlet side end portion of the deflecting member, particularly in the area of a side edge portion, that adjoins the inner surface of the riser tube. Advantageously, an upper edge portion of the deflecting member may be adjusted transversely to a riser tube direction inward or less far inwards in order to enable variable adjustment of the deflection effect toward the riser tube center. 10 15 20 25 30 Such an adjustability of the deflecting member may in principle be carried out manually, wherein, for example, several target positions can be specified for different particle types.

Alternatively, or in addition to such a presetability, the adjustment of the deflecting member may also be externally controlled and /or automatically or semi automatically controlled. According to an embodiment of the invention the deflecting member can comprise an externally controlled actuator, wherein advantageously the actuator is controlled by a control device which can take into account various parameters of adjustment of the de?ecting member, in particular operating parameters of the spreader and /or properties of spreading material. ln an advantageous embodiment of the invention, the control device may be connected to a determination means for determining of the spreading material to be discharged and for adjusting of the deflecting member, in particular its deflection angle, dependent on the spreading material, for example, for setting a steeper angle for heavier spreading material than for lighter spreading material.

Alternatively or additionally to determining of the spreading material the flow velocity and /or air quantity of the air flow through the riser tube and /or through the supply line and /or of the pneumatic blower can determined and the deflection angle be varied as a function of this air mass flow and / or the air flow rate.

According to an embodiment of the invention, the control device may also work like a feedback control, for example, such that the uniformity of distribution over the outlets of the spreader head is monitored and varied depending on detected irregularities of the angles of deflection and /or another adjustment parameter of the deflecting member. lf, for example, it is found that significantly more grains arrive at outlets in a sector of the spreader head than in an opposite sector, the setting angle of the deflecting member can be readjusted accordingly by the control device. The grains or their quantity and number let out through the outlets can be determined in a conventional manner, for example by means of optical sensors or other suitable sensor systems. 10 15 20 25 30 Said de?ecting member or its flow control surface can basically be arranged at different portions or at different heights of the riser tube. ln particular, the deflecting member or its flow guide surface can be arranged in a central portion of the riser tube, wherein a downstream end of the deflecting member may in particular be arranged at approximately half the height of the riser tube. Regardless of the actual height of the arrangement of the deflecting member it can advantageously be arranged in a straight riser tube portion, so that downstream of the deflecting member a further straight riser tube portion follows. Even upstream of deflecting member the riser tube may comprise another straight riser tube portion. ln particular, the deflecting member or the ?ow guide surface can be arranged in a nozzle portion of the riser tube, wherein the riser tube preferably comprises a slight constriction or a diameter minimum, so that spreading material grains deflected by the flow guide surface are accelerated and the flow guide surface is rendered particularly effective. For example, the riser tube may, starting at the deflection knee, which forms the connection to the tapering supply line, taper slightly continuously to about a central portion of the entire riser tube. An upper riser tube portion, which adjoins the deflecting member or the flow control surface, may have a constant cross section or a cylindrical contour, which in the entrance area of the spreader head can again expand to ensure a smooth transition into the spreader head chamber.

The riser tube portion disposed above the flow guide surface can have a longitudinal central axis which is coincident with a center line perpendicular to a deflecting member plate of the spreader head.

The invention is explained in detail below with reference to exemplary embodiments and associated drawings. ln the drawings: Fig. 1 shows a side view of the spreader head of an agricultural spreader, showing a riser tube leading to the spreader head and a supply line leading to the riser tube at an obtuse angle in a viewing direction transverse to the riser tube and across the supply line; 10 15 20 25 30 Fig. 2 shows a side view of the spreader head with the riser tube in a viewing direction in parallel with a Iongitudinal plane containing a riser tube axis and a supply line axis; Fig. 3 shows a plan view of the spreader head of figs. 1 and 2, showing the arrangement of a de?ecting member inside of the riser tube and its flow guide surfaces comprising lateral vanes; Figure 4 shows a side view of a spreader head with a riser tube and a supply line similar to fig. 1 in accordance with another embodiment of the invention, according to which the deflecting member in the riser tube is adjustable by an actuator and variable in pitch, Fig. 5 shows a side view of the spreader head with the riser tube of fig. 4 in a position rotated by 90°; Fig. 6 shows a plan view of the spreader head of figs. 4 and 5, showing the arrangement and configuration of the deflecting member inside of the riser tube; Fig. 7 shows a side view of a spreader head with a riser tube connected thereto and a supply line in a direction of view similar to figs. 1 and 4 in accordance with another embodiment of the invention, according to which the deflecting member is formed like a conical sleeve; and Fig. 8 shows a plan view of the spreader head of fig. 7, showing the eccentric positioning of the sleeve shaped deflecting member in the riser tube.

The spreader head 1 shown in the figures may be part of for example a seeder and / or fertilizer attachable to a tractor, which is not further shown, and may include a spreading material storage, from which a metering device, for example, comprising a dosing rotor, a desired spreading material amount in the form of seed, fertilizer granules, or the like can be output. By means of a fan, also not shown, the spreading material can, for example, be fed via a lying down or slightly rising supply line 3 to an erect, in particular vertically oriented riser tube 2, through which the spreading material is conveyed by means of an air flow generated by the blower centrally from below into the spreader head 1. The spreading material is thereby conveyed pneumatically via the central riser tube 2 into a distribution chamber 5 of the spreader head 10 15 20 25 30 10 1, wherein the distribution Chamber 5 may comprise a central deflecting member plate, for example in the form of a top wall, from which the pneumatically conveyed spreading material grains bounce off and are distributed in the distribution chamber 5.

The spreader head 1 distributes the incoming spreading material to a plurality of output means, with which the spreader head 1 is connected via spreader pipes or hoses. The spreader pipes are connected to outlets of the spreader head 1, which are arranged circumferentially distributed around the distribution chamber 5 and can communicate with the distribution chamber 5.

As shown in fig. 1, the spreader head 1 may include an overall - roughly spoken - mushroom shaped spreader body 8, which is housing shaped and in its interior defines said distribution chamber 5, which can be shaped in particular curved, slightly dish shaped and domed.

The riser tube 2 may form a vertically arranged, roughly spoken, straight channel, and centrally from below debouch into the distribution chamber 5, so that by an appropriate air flow through the riser tube 2 the spreading material, such as seed, fertilizer or similar granular material, can be blown into the distribution chamber 5.

The riser tube 2 can be straight and /or have a roughly spoken cylindrical contour, wherein the riser tube 2 may have a collar shaped expansion at its upper end 2o to harmoniously pass into the distribution chamber 5.

The supply line 3, which is only faintly indicated in the figures, can be connected via a diverting knee 4 to the lower end 2u of the riser tube 2, wherein said diverting knee 4 may have an arcuate course and an approximately circular cross section. Also, the riser tube 2 may have an approximately circular cross section.

The supply line 3 meets the riser tube 2 from one side, wherein the supply line 3at an obtuse or acute angle, for example perpendicular or even at a slightly obtuse angle, as shown in fig. 1, from below may lead to the approximately straight riser tube 2.

By this feeding from the side of the spreading material, the spreading material in the region of diverting knee 4 due to the centrifugal forces is 10 15 20 25 30 11 carried so to speak to the outside of the curve, so that it accumuiates or concentrates or forms a center of mass of grains in the lower portion of the riser tube 2 at a side facing away from the supply line 3. With reference being had to fig. 1, the spreading material gathers after the diverting knee 4 preferably on the right side of the riser tube 2. ln order to again distribute the spreading material in the riser tube 2 uniformly, especially uniformly with respect to the longitudinal central axis of the riser tube 2 or around a central perpendicular axis 9 of the spreader head 1, in the riser tube 2 there is a deflecting member 10, which deflects spreading material, that collects on the side of the riser tube facing away from the supply line 3, back to the middle of the riser tube 2. Said central perpendicular axis 9 of the spreader head 1 may in particular coincide with the longitudinal central axis of the riser tube 2, more precisely with an upper portion of said riser tube2. ln the area of the de?ecting member 10 there is, however, a longitudinal central axis 11 which is offset to the side toward the central perpendicular axis 9 of the supply line 3, wherein by said longitudinal central axis 11 is meant a perpendicular axis in the region of the deflecting member 10 through a surface cross section, which is left in the riser tube 2 under consideration of the deflecting member 10.

The deflecting member 10 namely forms a kind of cross sectional constriction or narrowing in the riser tube interior, so that the ascending spreading material has no longer access to the entire circular cross sectional contour of the riser tube that would be at hand if not for the deflecting member 10.

The deflecting member 10 may comprise a flow guide surface 12, which at the riser tube side facing away from the supply line 2 or adjacent thereto forms a portion of the riser tube inner surface and which moves the riser tube inner surface inward toward the longitudinal central axis. The bottom of the flow guide surface 12 may, for example, include a flattened portion of the riser tube inner surface, in the region of which the circular riser tube cross section is pressed inwardly, in particularly is flattened, cf. fig. 3. 10 15 20 25 30 12 The flow guide surface 12 can form a back of the deflecting member 10, which is turned away from the supply line 3. ln addition to this backside guide surface, the flow guide surface 12 include side webs or vanes 12f, which may extend transversely relative to said rear surface 12r and can be formed for example by side vanes or edge webs of the deflecting member 10.

Overall, the flow guide surface 12 may have a roughly spoken channel shaped contour, which can be laterally limited by the webs or vanes 12f of the deflecting member 10 and at the bottom side may be formed by the flattened inner surface of the riser tube 2, cf. fig. 3.

Said vanes 12f can approximately connect to the bottom 12b of the flow guide surface or be connected therewith, so that, when viewed in cross section of the deflecting member 10, a roughly spoken U-shaped cross section contour or a bowl shape is at hand.

As shown in particular in fig. 2, the lateral vanes 12f of the deflecting member 10 can run toward each other or decrease the gap between them in an up direction, i.e. the distance between the vanes 12f can be reduced in size toward the top, so that the side vanes 12f generate a nozzle effect, which increases effect of the desired spreading material redirection.

Furthermore, the entire riser tube 2 may be designed in the manner of a nozzle, especially in the area of the downstream end of the deflecting member 10 comprise a cross sectional taper or a minimum diameter, so that overall in the area of the deflecting member 10 a nozzle effect is achieved. As shown in figs. 1 and 2, the riser tube 2 from the diverting knee 4 and upward may taper to about half the height of the riser tube 2, wherein advantageously a continuous, slight taper with a taper angle of a few degrees can be provided, which already produces the desired nozzle effect.

Taking account of the deflecting member 10, in particular its bottom surface 12b or the flattened portion of the riser tube inner surface, the central portion 2m of the riser tube 2 gets longitudinal central axis 11, which passes through the cross sectional area gravity center and is offset toward the supply line 3 from the central perpendicular axis 9 of the spreader head 1. The upper portion of the riser tube 2 adjoining the deflecting member 10 has, however, a 10 15 20 25 30 13 longitudinal center axis which coincides with the central perpendicular axis 9, so that in the riser tube 2 a corresponding displacement is achieved in the transition area of the downstream end of the deflecting member 10 to the downstream adjoining riser portion, cf. fig. 1.

As shown in figs. 4, 5 and 6, the deflecting member 10 can advantageously be made adjustable or position changeable. ln particular, the deflecting member 10 including the bottom surface 12b and / or the lateral vanes 12f of the flow guide surface 12 may be tiltable about a tilt axis 13 transverse to the riser tube longitudinal axis, wherein said tilt axis 13 advantageously extends perpendicular to a longitudinal center plane, which contains the riser tube 2 and the supply line 3 and hence coincides with the plane of the drawing of fig. 4.

Said tilt axis 13 is advantageously arranged in a lower end portion or an upstream inlet region of the deflecting member 10, in particular in the region of the inner surface of the riser tube 2 on the side facing away from the supply line 3, so that tilting of the deflecting member 10 does not affect the capture of spreading material accumulated laterally in the riser tube 2. ln other words, the tilting axis 13 is advantageously positioned such that the inlet portion of the deflecting member 10, irrespective of the tilt position, conforms to the inner surface of the riser tube 2 on its side facing away from the supply line 3.

The tiltability of the deflecting member 10 can be controlled for example by a manually operable actuator, so that various settings can be made, for example, depending on the spreading material. However, in an advantageous embodiment of the invention even an outside energy controlled actuator 14 can be provided, for example in the form of an electric motor actuated spindle or in the form of a hydraulic cylinder, so that the tilt angle of the deflecting member 10 can be changed by motor or controlled by external energy. ln particular this enables a semi-automatic or automatic control of the position of the deflecting member 10 in dependence of various operating parameters, as was explained at the outset. The control device 15 connected 10 15 20 25 14 to the actuator 14 is connected to suitable sensors 16 that monitor the desired operating parameters.

As shown in fig. 8, the contour of the deflecting member 10 can also deviate from the shell shape according to figs. 1 to 6. Specifically, the deflecting member 10 can comprise a closed ring shaped, sleeve shaped contour and be shaped for example like a pipe stub or a sleeve. ln order to produce a desired effect nozzle, the sleeve shaped deflecting member 10 may comprise a cross sectional area tapering in a rising direction. Specifically, the deflecting member 10 may be shaped like a cone, cf. fig. 7, which from its inlet side comprises a continuous taper toward its outlet side. Here, the inlet side, that is, the lower end in accordance with fig. 7, has a smaller diameter than the riser tube 2, so that on the side of the supply line 3 a gap remains between the deflecting member 10 and the inner surface of the riser tube 2. On the side of the riser tube 2 facing away from the supply pipe 3 the conical or sleeve shaped deflecting member 10 may cling to the inner surface of the riser tube 2, to capture spreading material accumulated there.

The sleeve shaped deflecting member 10 may be contoured circular in cross section, but also comprise deviating cross sectional contours, for example in the form of elliptical, oval or polygonal cross sectional contours.

As shown in fig. 7, even such a sleeve shaped deflector 10 can be tilted about a tilt axis 13 and have its angular position adjusted by means of an actuator 14. ln this regard, reference is made to the preceding explanation.

Claims (17)

10 15 20 25 30 15 CLAIMS

1. Agricultural spreader for pneumatic spreading of spreading material such as seed and / or fertilizer, with an upright riser tube (2), which has an open upper end (20) in a spreader head (1) and a lower end (2u) connected to a supply line (3), which from one side in an obtuse or acute angle leads to the riser tube (2), wherein in the riser tube (2) a deflecting member (10) is provided having a flow guide surface (12) for deflecting the spreading material toward the center of the riser (2), c h a r a c t e r i z e d in that the flow guide surface (12) on a side of the supply line (3) facing away from the riser tube (2) forms a portion of the inner surface (2i) of the riser tube (2) or adjoins it and is drawn inwardly in the rise direction, so that a longitudinal central axis (11) of the riser tube (2) in the region of the deflecting member (10) with respect to a central perpendicular axis (9) of the spreader head (1) and / or with respect to the longitudinal central axis of a riser tube portion above the deflecting member (10) is offset to the side of the supply line (3).

2. Agricultural spreader according to the preceding claim, wherein the deflecting member (10) is arranged in a nozzle portion of the riser tube (2) and /or forms a nozzle portion of the riser tube (2), in which the cross sectional area of the riser tube (2) is reduced with respect to the cross sectional area of an above riser tube portion and / or a below riser tube portion.

3. Agricultural spreader according to the preceding claim, wherein the riser tube (2) from its lower end portion (2u) to a central portion of the riser (2) has a continuously reduced cross section, wherein said middle section of the riser tube (2) forms a nozzle, wherein a riser tube portion (2) above this nozzle has an enlarged cross section a relation to the cross section of the nozzle, wherein the deflecting member (10) is arranged in the region of the nozzle shaped reduced riser tube portion, in particular a downstream end portion of the deflecting member (10) in the area of said nozzle. 10 15 20 25 30 16

4. Agricultural spreader according to any one of the preceding claims, wherein the deflecting member (10) is arranged in a central portion of the riser tube (2), in particular a downstream outlet portion of the flow guide surface (12) at approximately half the height of the riser tube (2).

5. Agricultural spreader according to any one of the preceding claims, wherein the de?ecting member (10) has a bowl shaped contour, wherein the flow guide surface (12) comprises a bottom (12b), which is arranged on the side of the riser tube (2) facing away from the supply line (3) and comprises vanes (12f) laterally adjoining said bottom (12b).

6. Agricultural spreader according to the preceding claim, wherein said vanes (12f) of the flow guide surface (12) between them define a gap which tapers in the rising direction through the riser tube (2).

7. Agricultural spreader according to one of the two preceding claims, wherein said bottom (12b) of the flow guide surface (12) forms a ?attened portion.

8. Agricultural spreader according to one of the preceding claims, wherein the de?ecting member (10) forms an at least approximately annular deflector collar, which is inserted in the riser tube (2).

9. Agricultural spreader according to the preceding claim, wherein the deflector collar comprises an inlet side end portion, which snugly meets an inner surface of the riser tube (2) on a side facing away from the supply line (s).

10. Agricultural spreader according to one of the two preceding claims, wherein the deflector collar has a tapering cross section in a rising direction of the riser (2) tube, in particular, especially a conically tapering one.

11. Agricultural spreader according to one of the two preceding claims, wherein the deflector collar comprises an inlet side end portion, which has a 10 15 20 25 30 17 circumference and /or a diameter which is smaller than the inner circumference and /or internal diameter of the riser tube (2), so that at the riser tube (2) on the side facing the supply line (3) a gap remains between the inner surface of the riser tube (2) and the deflector collar.

12. Agricultural spreader according to one of the preceding claims, wherein the deflecting member (10) is mounted in the riser tube (2) so that its position and /or angle can be changed.

13. Agricultural spreader according to the preceding claim, wherein the deflecting member (10) is tiltable about a tilt axis (13), wherein said tilt axis (13) extends transversely to a longitudinal central plane passing through the riser tube (2) and the supply line (3).

14. Agricultural spreader according to the preceding claim, wherein the tilt axis (13) is arranged at an inlet side end portion of the deflecting member (10) and /or on a side of the riser tube (2) facing away from the supply line (3).

15. Agricultural spreader according to one of the preceding claims, wherein an outside energy controlled actuator (14) is provided for adjusting of the position and /or orientation of the deflecting member (10), which is controlled by a control device (15).

16. Agricultural spreader according to the preceding claim, wherein the control device (15) can be connected to detecting means (16) for detecting of at least one operating parameter of the spreader and comprises control means for controlling the actuator (14) and for changing of the position and/ or orientation of the deflecting member (10) in dependence of a determined operating parameter.

17. Agricultural spreader according to the preceding claim, wherein said detecting means comprises a determining means for determining the uniformity of the distribution of the spreading material in the spreader head 18 (1), and wherein the adjusting means are designed such that the angular position of the deflecting member (10) is controlled in dependence of the determined uniformity of the distribution of the spreading material in the spreader head (1 ).