Agricultural spreading machine such as seed drill

Abstract

Agricultural spreading machine, in particular a seed drill, for spreading granular material such as seed and / or fertilizer, with a pneumatic distribution system (5) comprising a distribution head (6) for distributing the material to be distributed to a plurality of spreading lines (7), and a conveyor line (8) for pneumatically feeding the distribution head (6) with the material to be distributed from a storage container, wherein the machine frame (2) has at least two machine frame parts (3, 9; 12) which are adjustable relative to one another by a movable frame interface (22), and the conveyor line (8) leads from one of the at least two machine frame parts (9) via the said movable frame interface (22) to a connection on the other of the at least two machine frame parts (3;12), characterized in that the conveyor line (8) has a telescopic line section (21) for compensating for offset of the conveyor line (8) in the region of the movable frame interface (22) when adjusting the at least two machine frame parts (3, 12; 9) relative to one another.;

Description

The present invention relates to an agricultural application machine, in particular in the form of a sowing machine, for applying granular distribution material such as seeds and / or fertilizers, having a pneumatic distribution system comprising a distribution head for distributing the distribution material to a plurality of application lines, and a conveying line for pneumatic loading of the distribution head with the distribution material from a storage container, wherein the machine frame has at least two machine frame parts which are displaceable relative to one another between working and transport positions, and the conveying line is guided from one of the machine frame parts across a movable frame interface between the machine frame parts to another of the machine frame parts mentioned.In agricultural application machines such as sowing machines or fertilizer spreaders, the seed or fertilizer is stored in a tank, which may optionally have separate chambers for seed and fertilizer, and conveyed via a distributor system to the application elements in order to be applied side by side in a plurality of rows. The distribution system often operates pneumatically and usually comprises a distribution head with a riser pipe which is charged pneumatically with the distribution material from the tank or storage container via a conveying line.The seed or fertilizer material distributed in the distributor head is conveyed to the discharge elements, for example in the form of sowing coulters, via a multiplicity of discharge lines which are connected to the distributor head, wherein individualizing devices such as individualizing switches can optionally also be provided.In order to actually distribute the material to be discharged uniformly or in the desired manner onto the discharge elements, the pneumatic distribution system is overall a rather complex system in which the various parameters such as the length of the discharge lines and the position and orientation of the distribution head influence the distribution. In this case, even minor changes in the spatial orientation of the conveying line or of the radii or bending angles which the conveying line takes on its path to the riser pipe of the distributor head can have a negative influence on the distribution of the seed or of the fertilizer. Even misalignment of the riser pipe or oblique or non-uniform injection of the seed into the riser pipe can have a negative influence on the distribution.For such a sensitive distribution system, it is important that the conveying line, via which the distribution head is supplied with seed or fertilizer from the storage container, is usually to be led over movable frame interfaces of the machine frame. In order to enable large working widths on the field on the one hand, but to be able to adhere to the limited permissible road transport width on the other hand, the machine frame of modern application machines is divided into a plurality of machine frame parts which are adjustable with respect to one another via one or more movable frame interfaces. For example, the machine frame can have side wings which can be pivoted about lying pivot axes from a lowered working position into an upright transport position. In order to avoid that pivoted-up side wings protrude too far upwards in the case of particularly large working widths, it is also known to use multiple foldable machine frames which can have, for example, a central machine frame part supported by a chassis, which can be mounted on a tractor via a mounting device. A machine frame part carrying the application elements is articulated to this central machine frame part, which on the one hand can be wound up usually forwards about a lying transverse axis and has side wings which in this wound-up position can be folded up about pivot axes which are then upright.The distributor head of the pneumatic distributor system is usually seated on such an adjustable machine frame part in order not to require excessively long discharge lines from the distributor head with an excessively small gradient to the discharge elements. Depending on the machine design, a plurality of distribution heads can also be provided, for example, seated on right and left side wings of the machine frame, so that the conveying line for feeding the at least one distribution head with distribution material from the storage container is to be guided over one or more movable frame interfaces.In order to be able to compensate or manage the offset occurring during the adjustment of the machine frame parts between the working position and the transport position and back, elastically bendable line sections such as rubber hose pieces are usually provided in the region of the movable frame interfaces, which line sections, for example, can compensate for the offset occurring during the adjustment of the machine frame parts with respect to one another in the region of the movable frame interfaces, given a sufficiently long dimensioning. However, such longer deformable hose pieces can adversely affect the sensitive distributor system, for example if, in the event of multiaxial folding of the machine frame parts into the transport position and then back into the working position again, the longer flexible hose piece no longer exactly forms back into the shape it had previously.Agricultural sowing machines having such pneumatic distributor systems and machine frame parts, which are adjustable between the lowered working position and the erected transport position, are described, for example, in the documents DE 10 2019 133 273 A1 or EP 38 31 180 A1.In order to be able to avoid longer flexible line sections when mounting a storage container on the front side of a tractor and to nevertheless allow the storage container to be raised, it has also already been proposed to mount a rigid conveying line on the tractor in a displaceable manner, cf. EP 38 68 204 A1, which, however, leaves unsolved the stated problem that, in the case of machines with large working widths and machine frame parts which can be adjusted with respect to one another, the conveying line has to be guided over the adjustable frame interfaces for pneumatic loading of one or more distributor heads and the offset occurring at the movable frame interfaces has to be compensated, which can lead to the sensitive pneumatic distributor system being adversely influenced.The object of the present invention is therefore to provide an improved agricultural application machine of the aforementioned type which avoids disadvantages of the prior art and advantageously develops the latter. In particular, in the case of pneumatic distribution systems having a distribution head on an adjustable machine frame part, despite the offset occurring during the adjustment, stable pneumatic charging of the distribution head is to be made possible, which takes account of the sensitive pneumatic charging and ensures uniform distribution.According to the invention, the object mentioned is achieved by an agricultural application machine according to claim 1. Preferred embodiments of the invention are the subject of the dependent claims.It is therefore proposed according to a first aspect to design the conveying line leading to the distributor head or connected to its riser pipe so as to be telescopic at least in sections, in order to compensate for an offset of the conveying line which occurs during the adjustment of the machine frame part carrying the distributor head from the working position into the transport position and back, at least partially by telescoping the conveying line. According to the invention, the conveying line has at least one telescopic line section for compensating displacements of the conveying line in the region of the movable frame interface. The telescopic line section makes it possible to avoid excessively long, flexible or elastic line sections made of rubber or rubber-like plastic and their tendency toward unwanted deformations and alignment errors. The telescoping line section can be folded and unfolded in a defined manner when the adjustable machine frame part is moved back and forth between its working and transport position, so that the conveying line for pneumatic loading of the distributor head in the working position can assume the orientation and length again in a defined manner which is required for precise pneumatic loading and thus for precise distribution of the seed or fertilizer.In a further development of the invention, the said telescopic line section of the conveying line can be mounted on the one hand on the second machine frame part, relative to which the machine frame part carrying the distributor head can be adjusted, and / or can be connected to a conveying line section fastened to the said second machine frame part and on the other hand can be connected to a conveying line section which is connected to the distributor head or is connected to its riser pipe. The telescopic line section thereby receives on the one hand a defined bearing point on the mentioned second machine frame part, with respect to which the adjustable first machine frame part with the distributor head fastened thereto is adjustable, and on the other hand the offset occurring at the movable frame interface can be well absorbed and compensated by the proximity of the arrangement of the telescopic line section.Advantageously, a mounting can be provided for the telescopic conveying line section, which mounting holds the telescopic conveying line section in a predefined orientation and position relative to the first machine frame part and / or relative to the second machine frame part both in the telescoping and in the telescoping state, wherein the mounting is advantageously designed such that the telescopic conveying line section assumes a defined position and orientation relative to the first machine frame part in its working position and assumes another defined position and orientation relative to the first machine frame part in its transport position with its end section on the distributor head side.By means of the defined alignments and positions of the end section of the telescopic conveying line section on the distributor head side, which end section is predetermined by the mounting, not only can the offset with respect to the second machine frame part occurring during the adjustment of the first machine frame part be compensated as well as possible, but it can also be ensured that the conveying line leading into the riser pipe of the distributor head takes a defined course in the lowered working position of the first machine frame part and the pneumatic loading of the distributor head takes place exactly in the desired manner in order to achieve a uniform distribution or the desired distribution exactly.The end of the telescopic conveying line section on the distributor head side can be connected to the riser pipe of the distributor head via a flexible pipe section, wherein such a flexible pipe section can be configured to be relatively short, since the flexible pipe section does not have to compensate for any length offset during the adjustment of the machine frame parts, but essentially only has to compensate for angular changes occurring during tilting.According to a further aspect, the conveying line can also have a telescopic conveying line section which bridges a movable frame interface in the region of the attachment device of the machine frame, in particular in the region of a drawbar rod which can be varied in length. The mentioned conveying line, in particular its telescopic conveying line section, can advantageously extend substantially parallel to the telescopic drawbar along this telescopic drawbar, so that the telescopic line section can follow or can involve an extension movement or a shortening movement of the attachment device or drawbar.The at least one telescopic conveying line section can comprise two or more than two line parts or pipe parts, which can be pushed into one another and sealed with respect to one another in order to avoid pressure losses during pneumatic charging of the distributor head. In order to avoid flow obstacles at the transitions of the telescopic parts in the flow cross section, the telescopic line parts can be arranged such that the cross sections of the telescopic parts increase in the flow direction or charging direction. For example, a telescoping line part of smaller diameter can be arranged upstream and can be seated or fitted telescopically in a telescoping line part of larger diameter which is arranged downstream. In principle, however, it would also be possible to reverse the arrangement, i.e. to arrange telescopic line parts of larger diameter upstream and telescopic line parts of smaller diameter downstream.The telescoping of the telescoping line section can basically take place in different ways. In a simple embodiment of the invention, it may be sufficient to manually adjust the length of the conveying line telescope and / or to manually fix, for example to plug out or clamp it, in the telescoping and / or telescoping positions.In an advantageous development of the invention, the telescopic conveying line section can, however, also be telescoped in and / or out by motor or by an actuator operated by external energy. A hydraulic cylinder or a pneumatic cylinder can serve as the actuator, for example, wherein, in an advantageous development of the invention, such an actuator can be articulated on the one hand on the end section or collar of a telescoping line part and on the other hand on the collar or at another point of another line part from which the telescoping line part can be telescoping. In an alternative development of the invention, however, it can also be provided that an end section of the telescopic line section is fastened to the second machine frame part or is fixedly mounted in the longitudinal direction and another line part which is telescopic with respect thereto is articulated to an actuating actuator which can likewise be supported on the second machine frame part on the other hand.In an advantageous development of the invention, the telescopic conveying line section can be connected to an actuating actuator which is provided per se for adjusting the first machine frame part relative to the second machine frame part. Such an actuator can be, for example, an excavation cylinder or a swivel cylinder, by means of which the first machine frame part can be excavated or swiveled with respect to the second machine frame part. The telescopic conveying line section can be connected to this excavation and / or pivoting cylinder in such a way that the telescopic conveying line section is telescopic in or telescopic out when the aforementioned excavation or pivoting cylinder is actuated in order to adjust the first machine frame part with respect to the second machine frame part, for example to move it into the transport position or back again into the working position. As a result, the telescoping and telescoping of the telescoping conveying line section is synchronized with the adjusting movement of the first machine frame part or is matched thereto.The mentioned adjusting actuator can, however, also be an adjusting actuator for adjusting the attachment device for attaching the machine to a tractor, in particular for retracting and extending a drawbar which can be varied in length. The telescopic conveying line section can be connected to this adjusting cylinder of the attachment device in such a way that the telescopic conveying line section is telescopic in or telescopic out when said adjusting cylinder is actuated in order to adjust the first machine frame part with respect to the second machine frame part or to adjust said attachment device, in particular to extend or extend the drawbar.Such a matching of the telescoping movement with the adjusting movement of the machine frame parts to one another can, however, also be effected by an adjusting gear which converts the adjusting movement of the machine frame parts to one another into a telescoping movement of the telescopic conveying line section. For example, the telescopic conveying line section can be articulated or supported with a first line part on the second machine frame part, for example articulated but firmly supported in the longitudinal direction, wherein a second line part adjustable for this purpose by telescoping can be articulated to a gear lever or to a support bracket, for example articulated but firmly supported in the longitudinal direction, wherein said gear lever or said bracket can be fastened to the first machine frame part. Such a gear linkage can be configured in one or more stages in order to translate or to translate displacement movements of the first and second machine frame parts relative to one another. For example, a scissors-action type gear linkage with several gear levers pivotable relative to each other can be provided in order to effect the telescoping and telescoping of the conveying line in the desired manner and to adapt it to the displacement movement of the two machine frame parts relative to each other.However, other motor-driven actuations of the telescopic capability can also be provided. For example, a spindle drive can be provided for telescoping and telescoping the telescoping conveying line section. Alternatively or additionally, an electric motor can be provided, which can cause the conveying line to telescope, for example, via a cable pull mechanism.Such a motor-driven actuation of the telescopic capability by a separate servomotor and / or spindle drive, which per se does not serve for the adjustment of the two machine frame parts with respect to one another, can be controlled in an advantageous development of the invention by a telescoping control device, which can advantageously operate as a function of the adjustment of the machine frame parts with respect to one another. For example, a sensor system can detect an adjustment of the first machine frame part relative to the second machine frame part and provide a sensor signal which indicates the adjustment and can be used by the control device for controlling the telescoping drive. For example, such a sensor system can comprise an angle sensor, which detects the angular position of the two machine frame parts with respect to one another, and / or a travel sensor, which can detect a displacement of a hydraulic cylinder for adjusting the machine frame parts.The invention is explained in more detail below with reference to a preferred exemplary embodiment and associated drawings. In the drawings, there are shown: FIG. 1 : shows a perspective illustration of an agricultural application machine in the form of a sowing machine according to an advantageous embodiment of the invention, wherein the application elements for applying seeds and / or fertilizers are mounted on a multiaxially foldable machine frame which is illustrated in a lowered working position, in which a distributor head of the pneumatic distributor system is seated on one of the machine frame parts in an upright working position, and a conveying line for loading the distributor head is illustrated in a telescopic position, wherein the partial views (a) and (b) point the application machine obliquely from the front and obliquely from the rear, respectively, FIG. 2 : shows a side view of the application machine from FIG. 1, which shows the machine frame in a folded-open or pivoted-in transport position and the telescopic conveying line section in a telescopic manner, wherein the partial views (a), (b) and (c) show the application machine in different positions of the machine frame parts, namely in the lowered working position (partial view (a)), in the partially pivoted-open front end and / or transport position (partial view (b)) and the fully folded transport position (partial view (c)), FIG. 3 : a perspective illustration of a further telescoping conveying line section of the pneumatic conveying line in the region of an adjustable drawbar, wherein the partial views (a) and (b) show the attachment device in the region of the drawbar and the conveying line running there obliquely from the front or obliquely from the rear, FIG. 4 : a side view of the telescopic conveying line section 11 in a telescope-in position with the drawbar set for a short time, FIG. 5 is a side view of the extended copied conveying line section with the drawbar extended or extended; and FIG. 6 : shows an illustration of the telescopic conveying line section of the conveying line in the extended state when the application machine is configured, wherein the partial view (a) shows a sectional view through the conveying line and the actuating actuator for adjusting the machine frame parts, and the partial view (b) shows a plan view of the application machine.As the figures show, the agricultural application machine 1 can be designed in the form of a sowing machine, wherein the application machine 1 independently thereof comprises a machine frame 2 which has machine frame parts which can be adjusted with respect to one another.As the figures show, the machine frame 2 can have a first machine frame part 3 which, lying in the working position, can extend transversely to the direction of travel and can carry a multiplicity of application elements 4, for example in the form of sowing coulters, in order to apply distribution material such as seed or fertilizer.For distributing the distribution material to said discharge elements 4, the discharge machine 1 comprises a pneumatic distribution system 5 which has a per se known distribution head 6, from which a plurality of discharge lines 7 extend and lead to said discharge elements 4.Said distributor head 6 is arranged or suspended on said first machine frame part 3 and assumes an upright working position in the lowered working position of the first machine frame part 3, cf. FIG. 1.The distribution head 6 is supplied with the distribution material to be discharged from a storage container, not shown, via a conveying line 8, which can extend along a second machine frame part 9, relative to which the first machine frame part 3 is adjustable. In particular, the first machine frame part 3 can be pivotably suspended from the second machine frame part 9, for example about a lying frame pivot axis 10 extending in the direction of travel, which can be arranged, for example, on a rear end section of the first machine frame 3, cf. FIG. 2.The second machine frame part 9 can be supported on the ground by means of a chassis 11 and can be mounted on a tractor, which is likewise not shown, via a suitable mounting device 12, for example in the form of a drawbar.In the lowered working position according to FIG. 1, the first machine frame part 3 can project transversely with respect to the second machine frame part 9, cf. FIG. 1.In order to reduce the width of the application machine for road transport, the first machine frame part 3 can be pivoted open forwards about the mentioned frame pivot axis 10, cf. FIG. 2, wherein the first machine frame part 3 can be formed so as to be bendable or foldable into itself, in order to be able to fold two side wings 13, 14 of the first machine frame part 3 forwards onto the second machine frame part 9, for example about two further frame pivot axes 15, 16, which each connect one of the side wings 13, 14 to a central section 17 of the first machine frame part 3 and in the lowered working position extend approximately in the direction of travel and in the upwardly ribbed transport position can extend upwards.For pivoting the first machine frame part 3 open about the frame pivot axis 10 relative to the second machine frame part 9, an actuating actuator 18 can be provided, for example in the form of a hydraulic cylinder, which can be articulated on the one hand on the first machine frame part 3 and on the other hand on the second machine frame part 9, cf. FIGS. 1 and 2, such that by adjusting the length of the hydraulic cylinder the first machine frame part 3 can be pivoted open about the frame pivot axis 10 from the lowered working position according to FIG. 1 into the upright transport position according to FIG. 2.Said distributor head 6 of the pneumatic distributor system 5 can be mounted on said first machine frame part 3, in particular its central section 17, such that the distributor head 6 likewise experiences an adjustment, in particular tilts forward, when the first machine frame part 3 is adjusted between the working position and the transport position, such that the conveying line 8 of the pneumatic distributor system 5 suspended from the second machine frame part 9 experiences an offset.The said conveying line 8 can be connected with its end on the distributor head side to a riser pipe 19 which, in the working position, leads perpendicularly into the distributor head 6 from below and, in the adjusted transport position according to FIG. 2, can assume an approximately horizontal orientation.The section of the conveying line 8 connected to the riser pipe 19 can be designed to be flexible, in particular can comprise an elastic pipe bend 20 which, during the described pivoting movement of the two machine frame parts 3 and 9, bends or deforms relative to one another and can compensate for the angular offset.In order to also compensate for the longitudinal offset occurring during the pivoting of the first machine frame part 3, the conveying line 8 comprises a telescopic line section 21, which can be arranged or suspended on the second machine frame part 9 and can be connected with its end section on the distributor head side to the elastic pipeline bend 20, cf. FIGS. 1 and 2.The telescoping line section 21 can advantageously be suspended from the second machine frame part 9 and connected to the first machine frame part 3 in such a way that the telescoping line section 21 automatically copies in and out when the first machine frame part 3 is adjusted.In particular, the telescopic line section 21 can be arranged along the adjustment actuator 18, which is provided for adjusting the first machine frame part 3 into the transport position and / or back into the working position, in particular in such a way that the telescopic line section 21 extends substantially parallel to the adjustment actuator 18.The telescoping line section 21 can advantageously be mounted with an end section in the region of the articulation point of the actuating actuator 18 on the second machine frame part 9, for example be fastened directly to the said actuating actuator 18 adjacent to its articulation point on the machine frame side, cf. FIGS. 1 and 2, but it is likewise possible to fasten the telescoping line section 21 in an articulated manner, for example, to the machine frame part 9 itself.With its end section on the distributor head side, the telescopic line section 21 can be articulated on the retractable and extendable part of the actuating actuator 18, for example on its piston rod, and / or can be fastened or suspended or articulated on the first machine frame part 3 in the region of the articulation point of the actuating actuator 18. For example, the end section of the telescopic line section 21 on the distributor head side can be fastened directly to the articulated bearing which connects the actuating actuator 18 to the first machine frame part 3, wherein, however, an articulated fastening of the telescopic line section 21 to the first machine frame part 3 is also possible, for example in the vicinity of the bearing point of the actuating actuator 18 on the first machine frame part 3.By mounting the opposite end sections of the telescopic line section 21 in the region of the two articulation points of the actuator 18, the telescopic line section 21 automatically carries along the actuating movements of the actuator 18, that is to say the telescopic line section 21 is copied in and out in coordination with the adjusting movement of the first machine frame part 3 relative to the second machine frame part 9.As already mentioned at the beginning, however, a separate actuating drive, such as a spindle drive or an electric motor, for example coupled to a cable drive, can also be provided for telescoping the telescopic line section 21.As FIGS. 3-5 show, the conveying line can also have a telescopic conveying line section 21, which bridges a movable frame interface 22 in the region of the attachment device 12, in particular a drawbar that can be varied in length. The mentioned conveying line 8, in particular its telescopic conveying line section 21, can advantageously extend substantially parallel to the telescopic drawbar along this telescopic drawbar, so that the telescopic line section 21 can follow or can involve an extension movement or a shortening movement of the attachment device or drawbar, cf. comparing FIGS. 4 and 5.FIG. 6 shows a sectional view in partial view (a) of the telescopic line section 21 of the conveying line 8 and of the actuating actuator 18, along which the telescopic conveying line section 21 extends. In particular, the telescopic adjustment path of the conveying line section 21 can substantially correspond to the adjustment path of the adjustment actuator 18 or can be somewhat longer in order to be able to take along the adjustment path of the adjustment actuator 18.As FIG. 6 ( a) further shows, the telescopic piece of smaller diameter can advantageously be arranged upstream with respect to the conveying direction of the material to be distributed and extend into the larger telescopic piece arranged downstream, so that there is no abutting edge for the material to be conveyed in the region of the transition of the telescopic parts.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2019,133 273 A1

[0008] EP 38 31 180 A1

[0008] EP 38 68 204 A1

[0009]

Claims

Agricultural application machine, in particular a sowing machine, for applying granular distribution material such as seeds and / or fertilizers, having a pneumatic distribution system (5) comprising a distribution head (6) for distributing the distribution material to a plurality of application lines (7), and a conveying line (8) for pneumatic loading of the distribution head (6) with the distribution material from a storage container, wherein the machine frame (2) has at least two machine frame parts (3, 9; 12) which are adjustable with respect to one another by a movable frame interface (22), and the conveying line (8) from one of the at least two machine frame parts (9), beyond the said movable frame interface (22), to a connection on the other of the at least two machine frame parts (3; A conveying line according to claim 12, characterized in that the conveying line (8) comprises a telescopic line section (21) for compensating offset of the conveying line (8) in the region of the movable frame interface (22) when the at least two machine frame parts (3, 12; 9) are adjusted relative to one another.Agricultural application machine according to the preceding claim, wherein the telescopic conveying line section (21) is mounted on the one hand on said second machine frame part (9) and / or is connected to a conveying line section (23) fastened to said second machine frame part (9) and is mounted on the other hand on the first machine frame part (3) and / or is connected to a conveying line section (20) fastened to the first machine frame part (3).Agricultural application machine according to one of the preceding claims, wherein the distributor head (6) is arranged on a first machine frame part (3) which can be adjusted between working and transport positions, and the conveying line (8) is guided from a second machine frame part (9), to which the first machine frame part (3) can be adjusted via a movable frame interface (22), via the said movable frame interface (22) to the distributor head (6), in particular to a riser pipe (19) connected thereto,Agricultural application machine according to the preceding claim, wherein the end section on the distributor head side of the telescopic conveying line section (21) is connected to an elastic pipe bend (20) which is connected to the riser pipe (19) of the distributor head (6).Agricultural application machine according to one of the preceding claims, wherein the machine frame (2) is provided with an attachment device (12) for attaching the agricultural application machine (1) to a tractor, which attachment device has a drawbar that can be adjusted in length and / or extended and extended, wherein the telescopic conveying line section (21) extends beyond the movable frame interface (22) of the attachment device (12) on said drawbar and can be adapted to the length setting and / or the extended and retracted positions of the drawbar by telescoping.Agricultural application machine according to one of the preceding claims, wherein the telescopic conveying line section (21) is arranged at least approximately parallel to a longitudinal axis of one of the at least two machine frame parts (9) and extends along said machine frame part (9).Agricultural application machine according to one of the preceding claims, wherein the telescopic conveying line section (21) extends horizontally, at least approximately parallel to the direction of travel, and one of the machine frame parts (3) is pivotable about a horizontal frame pivot axis (10) extending transversely to the direction of travel with respect to another machine frame part (9).Agricultural application machine according to the preceding claim, wherein a terminal section on the distributor head side of the telescopic conveying line section (21) extends, when the one machine frame part (3) is in the transport position, in front of the frame pivot axis (10), as viewed in the direction of travel, and, when the said machine frame part (3) is in the working position, behind the said frame pivot axis (10), as viewed in the direction of travel.Agricultural application machine according to one of the preceding claims, wherein an adjusting actuator (18), in particular in the form of a hydraulic cylinder, is provided for adjusting the machine frame parts (3) relative to one another and the telescopic conveying line section (21) extends along said adjusting actuator (18), wherein a first end section of the telescopic conveying line section (21) is articulatedly fastened to a / the first machine frame part (3) in the region of an articulation point of the adjusting actuator (18) and is articulatedly fastened to a / the second machine frame part (9) with another end section in the region of an articulation point of the adjusting actuator (18), such that the telescopic conveying line section (21) is copied in and out during adjusting movements of the adjusting actuator (18).Agricultural application machine according to one of the preceding claims, wherein the telescopic conveying line section (21) has at least two telescopic parts which are telescopic into one another and are sealed off from one another, in particular by a mechanical seal which can be displaced during telescopic operation.Agricultural application machine according to one of the preceding claims, wherein the telescopic conveying line section (21) has a line diameter which increases stepwise in the conveying direction of the distribution material through the conveying line (8) and / or has an upstream telescopic part with a comparatively smaller diameter and a downstream telescopic part with a comparatively larger diameter.Agricultural application machine according to one of the preceding claims, wherein a telescoping drive is provided for telescoping the telescoping conveying line section (21) and is controlled by a control device as a function of an adjustment of the first machine frame part (3) relative to the second machine frame part (9).Agricultural application machine according to the preceding claim, wherein the telescoping drive has a spindle drive and / or an electric motor for telescoping the telescoping conveying line section (21).

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