Material-distribution system for an agricultural application machine, and agricultural application machine having a material-distribution system comprising a plurality of row units

Abstract

The invention relates to a material-distribution system (10) for an agricultural application machine, comprising: a main distribution device (30) which can be charged using gravity and has a main storage region, a feed inlet, which is connected to the main storage region, for feeding application material (M1, M2) into the main storage region using gravity, and a plurality of distribution outlets for discharging distribution air flows loaded with application material (M1, M2) out of the main storage region; and a storage container (32) connected to the feed inlet and associated with the main distribution device (30), which can be charged using gravity, for storing the application material (M1, M2) prior to feeding same into the main storage region using gravity.

Description

[0001] Description

[0002] Material distribution system for an agricultural spreading machine and an agricultural spreading machine with a material distribution system comprising several row units

[0003] The invention relates to a material distribution system for an agricultural spreading machine and an agricultural spreading machine with a material distribution system comprising several row units.

[0004] Material distribution systems of agricultural spreading machines typically feature a flow-controlled main distribution unit. Such main distribution units comprise a distribution chamber, a flow inlet connected to the distribution chamber for a supply airflow loaded with spreading material, and several distribution outlets for dischargering material-loaded airflows from the distribution chamber. These flow-controlled main distribution units can, for example, be designed as a distribution head, with the flow inlet of the main distribution unit being connected to a storage hopper for holding spreading material before it is fed into the distribution chamber of the distribution head via the flow control system.

[0005] It has been found that flow-based feedable main distribution systems have disadvantages for some application scenarios and are therefore only suitable to a limited extent.

[0006] The object underlying the invention is therefore to at least partially overcome the disadvantages of material distribution systems with a main distribution device that can be fed via a flow-based system.

[0007] The problem is solved by a material distribution system according to the invention with a gravity-fed main distribution device, which has a main storage area and a feed inlet connected to the main storage area for gravity-fed feeding of

[0008] The material distribution system according to the invention comprises a feed inlet for the main storage area and several distribution outlets for diverting distribution airflows loaded with the material from the main storage area. The system also includes a storage container connected to the feed inlet and associated with the gravity-fed main distribution unit for storing the material before its gravity-fed feed into the main storage area.

[0009] Because the main distribution unit can be fed with application material from the storage hopper by gravity, no separate airflow is required for feeding the main distribution unit. This reduces system complexity and simplifies the material distribution process.

[0010] In a preferred embodiment, the material distribution system according to the invention has a secondary feed path through which dispensing material can be supplied to the main storage area and / or the storage container associated with the gravity-fed main distribution unit and / or the feed inlet by means of a supply air flow. Preferably, the material distribution system has a primary feed path for the dispensing material through which the main distribution unit can be supplied with the dispensing material by gravity. Thus, the main distribution unit can be supplied with dispensing material via the primary feed path by gravity and via the secondary feed path by means of a supply air flow.The main distribution system can therefore be supplied with application material using both gravity-based and flow-based methods, so that, depending on the application, one or both feeding concepts can be used when applying the material to an agricultural area.

[0011] In a further preferred embodiment, the material distribution system according to the invention includes an air separator for separating the supply air from the supply air flow. The air separator can, for example, be arranged along the secondary feed path. The air separator can also be arranged in or on the storage container associated with the gravity-fed main distribution unit. The air separator can also be arranged in or on the gravity-fed main distribution unit. The air separator can, for example, be designed as a cyclone.

[0012] In a further development of the material distribution system according to the invention, the main storage area is located in a distribution housing of the gravity-fed main distribution unit, wherein the air separator is located in or on the distribution housing, outside the distribution housing, or integrated into the distribution housing. Because the air separator is located in or on the distribution housing, or integrated into the distribution housing, a supplementary connecting line between the air separator and the distribution housing is not required or can be implemented relatively simply and therefore cost-effectively. Extensive hose or pipework costs are eliminated. The air separator can be detached from the distribution housing, thus simplifying maintenance and / or replacement of the air separator.The air separator may have a removable lid or a removable cover, allowing for inspection and cleaning of the separation area of ​​the air separator.

[0013] Furthermore, a material distribution system according to the invention with several row units for the row-specific application of spreading material onto an agricultural area is preferred. Each row unit can include a depositing device associated with the gravity-fed main distribution unit for depositing the spreading material distributed by the gravity-fed main distribution unit. The depositing devices of the row units associated with the gravity-fed main distribution unit can be designed as seed coulters or include seed coulters. The several row units are preferably arranged side by side transversely to the direction of travel and attached to one or more crossbeams. The one or more row units can be movably attached to the crossbeam, in particular with adjustable height, so that contour adaptation and / or compensatory movement of the row units is possible.In a further preferred embodiment of the material distribution system according to the invention, the gravity-fed main distribution unit has a level sensing device for detecting the level of dispensed material in the main storage area. Alternatively or additionally, a level sensing device for detecting the level of dispensed material can also be arranged on or in the storage container associated with the gravity-fed main distribution unit. The level sensing device can be arranged between the air separator and the distribution outlets of the gravity-fed main distribution unit. The level sensing device can comprise one or more level sensors. The level sensors can be configured to detect the level without contact.

[0014] In another preferred embodiment, the material distribution system according to the invention has a main distribution unit that can be fed by flow. The main distribution unit, which can be fed by flow, comprises a distribution chamber, a flow inlet connected to the distribution chamber for a supply airflow loaded with application material, and several distribution outlets for discharged the distribution airflows loaded with application material from the distribution chamber. The material distribution system further comprises a storage container connected to the flow inlet and associated with the main distribution unit for storing application material before its flow-based feeding into the distribution chamber. The material distribution system therefore comprises two storage containers. One storage container is associated with the main distribution unit that can be fed by gravity.Another storage container is assigned to the flow-feed main distribution system. This storage container is connectable to the gravity-feed main distribution system, particularly to its feed inlet. Preferably, the gravity-feed main distribution system can be supplied with material from the storage container assigned to the flow-feed main distribution system via the secondary feed path. Conversely, the gravity-feed main distribution system can be supplied with material from the storage container assigned to the gravity-feed main distribution system via the primary feed path. Thus, the material from both storage containers can be introduced into the gravity-feed main distribution system.The two storage containers can hold different application materials, such as fertilizer and seed. They can also hold different types of seed or fertilizer. Alternatively, the same application material can be stored in both containers, thus increasing the area capacity – that is, the area that can be treated with a single load of the material distribution system.

[0015] In a further preferred embodiment, the material distribution system according to the invention comprises a driveable metering device with which the quantity of dispensing material supplied to the flow-controlled main distribution device can be adjusted. The material distribution system can further comprise a control device for controlling a drive for the metering device. The control device is preferably an electronic control device. The driveable metering device preferably has an electric drive, in particular an electric motor, which is controlled by the control device. The metering device can, for example, be a rotaryally driven rotary valve through which the dispensing material can be metered into the supply airflow.

[0016] In another preferred embodiment of the material distribution system according to the invention, the control device is configured to control the metering device depending on the fill level of dispensing material in the main storage area of ​​the gravity-fed main distribution unit. Alternatively or additionally, the control device can be configured to control the metering device depending on the fill level of dispensing material in the storage container associated with the gravity-fed main distribution unit and / or at another fill level of dispensing material at a different location within the material distribution system. The metering device can include a metering motor. The control device is preferably configured to control the rotational speed of the metering motor of the metering device depending on the fill level of dispensing material.

[0017] The material distribution system according to the invention is further advantageously enhanced by a switching device, wherein the material distribution system can be switched between a first feeding mode, in which the gravity-fed main distribution unit receives application material from the storage container associated with the gravity-fed main distribution unit, and a second feeding mode, in which the gravity-fed main distribution unit receives application material from the storage container associated with the flow-fed main distribution unit. The switching device can be manually operated. The switching device can be operated via a controllable actuator. The switching devices can, for example, be used to switch between fertilizer conveying and seed conveying.This results in a significantly reduced hose installation effort and a significantly reduced installation space requirement. If no fertilizer needs to be carried, the amount of seed that can be carried is significantly increased. Furthermore, a material distribution system according to the invention is preferred in which the switching device has a multi-way valve by means of which the application material from the storage container associated with the flow-feed main distribution unit can be selectively fed to either the flow-feed main distribution unit or the gravity-feed main distribution unit. The multi-way valve can, for example, be a 3-2-way valve.

[0018] Furthermore, a material distribution system according to the invention is advantageous in which the switching device has a multi-way valve by means of which the supply air separated by the air separator can be directed to the gravity-fed main distribution device. By means of the separated supply air, the dispensed material can be directed to the depositing devices connected to the distribution outlets in the gravity-fed main distribution device.

[0019] Furthermore, a material distribution system according to the invention is advantageous in which the main distribution unit, which can be fed by flow, is designed as a distribution head. The distribution head can have a material circulation path and / or an air discharge path. The distribution head preferably has a return path. In the case of overpressure singulation, the air pressure in the distribution lines must always be higher than the pressure of the overpressure singulation unit. Otherwise, the dispensed material from the overpressure singulation unit is conveyed back into the distribution lines. A distribution head without an air discharge path towards the overpressure singulation unit interrupts the air discharge towards the overpressure singulation unit when the distribution outlets are closed and is therefore unsuitable for overpressure singulation. A distribution head with an air discharge path discharges air towards the singulation unit even when the distribution outlets are closed.The distribution outlets of the flow-controlled main distribution unit can be blocked by means of blocking elements, wherein a control unit of the material distribution system is configured to actuate actuators connected to the blocking elements to release and block the distribution outlets of the flow-controlled main distribution unit. The blocking elements can be butterfly valves. The control unit preferably implements a butterfly valve control system.

[0020] In a further preferred embodiment of the material distribution system according to the invention, each row unit has a singulation device for singulating the application material granules. The application material is supplied to the singulation devices by intermediate storage units of the respective row unit. The singulation devices can be configured to operate according to the principle of overpressure singulation. This enables high driving speeds during the application of the application material onto the agricultural land and thus leads to high application efficiency. The material distribution system according to the invention is further advantageously developed in that each row unit has a depositing device associated with the flow-dependent main distribution device for depositing the application material distributed by the flow-dependent main distribution device.Furthermore, each row unit has a storage device assigned to the gravity-fed main distribution unit for depositing the application material distributed by the gravity-fed main distribution unit. The storage devices assigned to the flow-fed main distribution unit can also be located on a front attachment, with the row units being components of a rear attachment. The front attachment can alternatively or additionally include a storage container in addition to the storage devices assigned to the flow-fed main distribution unit. The material distribution system can also have a front attachment without including storage devices assigned to the flow-fed main distribution unit. In this case, the front attachment can, for example, include a storage container.The placement device associated with the flow-feed main distribution unit may include a fertilizer coulter. The placement device associated with the flow-feed main distribution unit may include a furrow opener for opening a fertilizer placement furrow and / or a shot tube for shooting the fertilizer into the opened fertilizer placement furrow. The placement device associated with the gravity-feed main distribution unit may include a seed coulter. The placement device associated with the gravity-feed main distribution unit may include a furrow opener for opening a seed placement furrow and / or a shot tube for shooting the seed into the opened seed placement furrow.

[0021] The problem underlying the invention is further solved by an agricultural spreading machine with a material distribution system comprising several row units, wherein the material distribution system of the agricultural spreading machine according to the invention is designed according to one of the embodiments described above. With regard to the advantages and modifications of the agricultural spreading machine according to the invention, reference is therefore made to the advantages and modifications of the material distribution system according to the invention.

[0022] The application machine can include one or more blowers to generate the supply air flows and / or the distribution air flows.

[0023] Preferred embodiments of the invention are explained and described in more detail below with reference to the accompanying drawings. These show:

[0024] Fig. 1 shows a material distribution system according to the invention in a first feeding mode, in which a gravity-fed main distribution device is supplied with dispensing material from a storage container assigned to the gravity-fed main distribution device.

[0025] Fig. 2 shows the material distribution system shown in Fig. 1 in a second feeding mode, in which the gravity-based feeding main distribution device receives material from a storage container associated with the flow-based feeding main distribution device;

[0026] Fig. 3 shows another material distribution system according to the invention in a first feeding mode, in which a gravity-fed main distribution device is supplied with dispensing material from a storage container assigned to the gravity-fed main distribution device, and

[0027] Fig. 4 shows the material distribution system depicted in Fig. 3 in a second feeding mode, in which the gravity-fed main distribution unit receives application material from a storage container associated with the flow-fed main distribution unit. Fig. 1 shows a material distribution system 10 of an agricultural spreading machine, in which two different application materials, for example, seed and fertilizer, can be applied simultaneously row by row with the agricultural spreading machine.

[0028] The material distribution system 10 includes a blower 12, which can generate an airflow. In a first path of the piping system connected to the blower 12, an airflow generated by the blower 12 is initially directed through a valve 14a, whereby the airflow can be blocked by means of the valve 14a. From the valve 14a, the air flows through the multi-way valve 16a. The multi-way valve 16a has an actuator for switching the multi-way valve 16a, the actuator being controllable via an electronic control device 18.

[0029] The airflow passing through the multi-way valve 16a then enters a metering device 20, which allows a preset quantity of application material M1 to be metered into the airflow. The metering device 20 may include a metering motor, with the control device 18 controlling the rotational speed of the metering motor of the metering device 20. The application material M1 metered into the airflow by the metering device 20 is located in the reservoir 22, which is arranged above the metering device 20. From the reservoir 22, the application material M1 falls onto a metering rotor of the metering device 20, via which the application material M1 is metered into the airflow.

[0030] The air L1 loaded with application material M1 is then passed through the multi-way valve 16b and subsequently enters a distribution chamber of a flow-based feedable main distribution unit 24. The multi-way valve 16b also has an actuator for switching the multi-way valve 16b, the actuator being controllable via the electronic control unit 18.

[0031] The air L1, loaded with application material M1, enters the distribution chamber of the flow-controlled main distribution unit 24 via a flow inlet of the flow-controlled main distribution unit 24. The flow-controlled main distribution unit 24 has several distribution outlets for directing distribution air flows loaded with the application material M1 out of the distribution chamber.

[0032] The storage container 22 is assigned to the flow-controlled main distribution unit 24 and serves to store the application material M1 before its flow-controlled feeding into the distribution chamber of the main distribution unit 24. The flow-controlled main distribution unit 24 is designed as a distribution head, with the distribution outlets arranged along the circumference of the flow-controlled main distribution unit 24.

[0033] The distribution air streams, loaded with application material M1 and discharged from the distribution outlets, are each directed to a depositing device 26. The depositing devices 26 are arranged side by side transversely to the direction of travel and serve to deposit the application material M1 distributed by the main distribution device 24, which can be fed by the airflow. Each depositing device 26 can include a fertilizer coulter. The depositing devices 26 have a furrow opener 28 for opening a fertilizer placement furrow. The furrow opener 28 can include one or more cutting discs. The depositing device 26 also includes a discharge tube (not shown) for shooting the fertilizer into the opened fertilizer placement furrow.

[0034] A portion of the airflow generated by the blower 12 is directed via valve 14b and multi-way valves 16b and 16c to a gravity-fed main distribution unit 30. Multi-way valve 16c also has an actuator for switching the multi-way valve 16c, which can be controlled via the electronic control unit 18. The gravity-fed main distribution unit 30 has a main storage area, a feed inlet connected to the main storage area for gravity-fed supply of application material M2 to the main storage area, and several distribution outlets for discharged distribution airflows loaded with application material M2 from the main storage area.The application material M2 is stored in a storage container 32 connected to the feed inlet and assigned to the gravity-fed main distribution unit 30, before the application material M2 is fed to the main storage area by gravity.

[0035] The distribution air streams, discharged via the multiple distribution outlets of the gravity-fed main distribution unit 30 and carrying application material M2 and air L2, are then each directed to a storage unit 34. The storage units 34 serve to deposit the application material M2 distributed by the gravity-fed main distribution unit 30. The storage units 34 comprise an intermediate storage unit 36 ​​and a singulation unit 38. The application material M2 is supplied to the singulation unit 38 by the intermediate storage unit 36. The singulation unit 38 is designed to operate according to the principle of overpressure singulation. For this purpose, an air stream L3, also generated by the blower 12 and controllable via the valve 14c, is supplied to the singulation unit 38.

[0036] The material distribution system 10 comprises a switching device by means of which the material distribution system 10 can be switched between a first feeding mode and a second feeding mode. The multi-way valves 16a-16c and the control device 18 are components of the switching device. Fig. 1 shows the material distribution system 10 in the first feeding mode, in which the gravity-fed main distribution unit 30 receives dispensing material M2 from the storage container 32 associated with the gravity-fed main distribution unit 30. In the first feeding mode, the flow-fed main distribution unit 24 also receives dispensing material M1 from the storage container 22 associated with the flow-fed main distribution unit 25.

[0037] Since the multi-way valves 16a-16c each have a controllable actuator, the control device 18 can cause the multi-way valves 16a-16c to be switched without requiring manual actuation of the multi-way valves 16a-16c.

[0038] Fig. 2 shows the material distribution system 10 in the second feeding mode, in which the gravity-based feeding main distribution device 30 is supplied with dispensing material M1 from the storage container 22 assigned to the flow-based feeding main distribution device 24.

[0039] When switching from the first to the second feeding mode, the multi-way valves 16a-16c are activated. Activating multi-way valve 16a blocks the flow path through valve 14a. The flow path through valve 14b is connected to the metering unit 20 via a flow diversion. After metering the application material M1, the supply air flow, now loaded with application material M1, is not fed to the flow-controlled main distribution unit 24, but rather to the air separator 42 via a secondary feed path 44. The air separator 42 can be a cyclone and serves to separate the supply air from the supply air flow. The supply air separated by the air separator 42 is introduced into the gravity-fed main distribution unit 30 via the activated multi-way valve 16c.The application material M1 leaving the air separator 42 then enters the gravity-fed main distribution unit 30 via the storage container 32.

[0040] Thus, material M1, which is stored in the storage container 22, can also be deposited on the agricultural land via the storage facilities 34.

[0041] The gravity-fed main distribution unit 30 has a level sensing device 40 for detecting the level of dispensing material M1 in the main storage area. The control unit 18 is configured to control the metering unit 20 depending on the level detected by the level sensing device 40. The level sensing device 40 can also be arranged in the storage container 32 and monitor the level of the storage container 32. In other embodiments, the level sensing device can also be arranged at a different position between the inlet of the air separator 42 and the distribution outlets of the gravity-fed main distribution unit 30. The level-dependent control of the metering unit 20 prevents any impairment of the air separation by the air separator 42.

[0042] Fig. 3 shows a material distribution system with two blowers 12a, 12b. In the first feeding mode of the material distribution system 10, blower 12a generates an airflow L1, which is directed to the flow-based feeding main distribution unit 24, and an airflow L2, which is directed to the gravity-based feeding main distribution unit 30.

[0043] The blower 12b generates an airflow L3, which operates the singulation device 38 and the depositing device 34. The depositing device 26 and the depositing device 34 form a row unit 46 for the row-related depositing of the application materials M1 and M2.

[0044] Fig. 4 shows the material distribution system 10 depicted in Fig. 3 after switching to the second feeding mode. During the switch to the second feeding mode, the multi-way valves 16a-16c are switched so that the gravity-fed main distribution unit 30 receives dispensing material M1 from the storage container 22 associated with the flow-fed main distribution unit 24.

[0045] In an embodiment of the material distribution system according to Figures 1 and 2 (not shown), it is conceivable that only the multi-way valve 16b is switched to the second feeding mode, as shown in Figure 2, and the multi-way valve 16a remains in the first feeding mode, as shown in Figure 1, with the multi-way valve 16c having a third switching position in which both inlets are connected to one outlet each. In this embodiment, the gravity-fed main distribution unit 30 is supplied with both the dispensing material M1 from the storage container 22 and the dispensing material M2 from the storage container 32, as well as air L1 via the flow-fed main distribution unit 24 and the multi-way valve 16b, and air L2 via the multi-way valve 16a.

[0046] In an embodiment of the material distribution system according to Figures 3 and 4 (not shown), it is conceivable that only the multi-way valve 16b is switched to the second feeding mode, as shown in Figure 4, and the multi-way valve 16a remains in the first feeding mode, as shown in Figure 3, with the multi-way valve 16c having a third switching position in which both inlets are connected to one outlet each. In this embodiment, the gravity-fed main distribution unit 30 is supplied with both the dispensing material M1 from the storage container 22 and the dispensing material M2 from the storage container 32, as well as air L1 via the flow-fed main distribution unit 24 and the multi-way valve 16b, and air L2 via the multi-way valve 16a.

[0047] Reference sign

[0048] 10 Material distribution system

[0049] 12, 12a, 12b blower

[0050] 14a-14c valves

[0051] 16a-16c Multi-way valves

[0052] 18 Control unit

[0053] 20 Dosing device

[0054] 22 storage containers

[0055] 24 flow-based feedable main distribution unit

[0056] 26 Storage unit

[0057] 28 furrow openers

[0058] 30 gravity-fed main distribution units

[0059] 32 storage containers

[0060] 34 Storage unit

[0061] 36 Interim storage unit

[0062] 38 Singling device

[0063] 40 Level detection device

[0064] 42 air separators

[0065] 44 Secondary feed path

[0066] 46 row units

[0067] M1, M2 application material

[0068] L1-L3 Air

Claims

Claims 1. Material distribution system (10) for an agricultural spreading machine, comprising a gravity-fed main distribution unit (30) which includes a main storage area, a feed inlet connected to the main storage area for gravity-fed feeding of spreading material (M1, M2) into the main storage area, and several distribution outlets for discharging air streams loaded with spreading material (M1, M2) from the main storage area; and a storage container (32) connected to the feed inlet and associated with the gravity-fed main distribution unit (30) for storing the spreading material (M1, M2) before gravity-fed feeding into the main storage area.

2. Material distribution system (10) according to claim 1 , characterized by a secondary feed path (44) via which soft dispensing material (M1) can be supplied to the main storage area and / or the storage container (32) associated with the gravity-fed main distribution device (30) and / or the feed inlet by means of a feed air flow.

3. Material distribution system (10) according to claim 2, characterized in that along the secondary feed path (44); and / or in or on the storage container (32) associated with the gravity-fed main distribution device (30); and / or in or on the gravity-fed main distribution device (30) an air separator (42) is arranged for separating the supply air from the supply air flow.

4. Material distribution system (10) according to claim 3, characterized in that the main storage area is located in a distribution housing of the gravity-fed main distribution device (30), wherein the air separator (42) is located in or on the distribution housing or outside the distribution housing or is integrated into the distribution housing.

5. Material distribution system (10) according to one of the preceding claims, characterized by several row units (46) for the row-related application of application material (M1 , M2) onto an agricultural area.

6. Material distribution system (10) according to one of the preceding claims, characterized in that the gravity-fed main distribution device (30) has a level detection device (40) for detecting the level of dispensing material (M1 , M2) in the main storage area.

7. Material distribution system (10) according to one of the preceding claims, characterized by a flow-based feedable main distribution device (24), which comprises a distribution chamber, a flow inlet connected to the distribution chamber for a feed air flow loaded with application material (M1) and several distribution outlets for discharged distribution air flows loaded with application material (M1) from the distribution chamber; and a storage container (22) connected to the flow inlet and associated with the flow-based feedable main distribution device (24) for storing application material (M1) before flow-based feeding into the distribution chamber; characterized in that the storage container (22) associated with the flow-based feedable main distribution device (24) is connectable to the gravity-based feedable main distribution device (30), in particular to the feed inlet of the gravity-based feedable main distribution device (30).

8. Material distribution system (10) according to claim 7, characterized by a driveable metering device (20) with which the quantity of dispensing material (M1) supplied to the flow-based feedable main distribution device (24) can be adjusted, and a control device (18) for controlling a drive of the metering device (20).

9. Material distribution system (10) according to claim 7, characterized in that the control device (18) is configured to control the metering device (20) depending on the fill level of dispensing material (M1 , M2) in the main storage area of ​​the gravity-fed main distribution device (30).

10. Material distribution system (10) according to claim 9, characterized by a switching device by means of which the material distribution system (10) can be switched between a first feeding mode, in which the gravity-fed main distribution device (30) is supplied with dispensing material (M2) from the storage container (32) associated with the gravity-fed main distribution device (30), and a second feeding mode, in which the gravity-fed main distribution device (30) is supplied with dispensing material (M1) from the storage container (22) associated with the flow-fed main distribution device (24).

11. Material distribution system (10) according to claim 10, characterized in that the switching device has a multi-way valve (16b) by means of which the dispensing material (M1) from the storage container (22) associated with the flow-based main distribution device (24) can be selectively fed to the flow-based main distribution device (24) and the gravity-based main distribution device (30).

12. Material distribution system (10) according to claim 10 or 11, characterized in that the switching device has a multi-way valve (16b) by means of which the supply air separated from the air separator (42) can be directed to the main distribution device (30) which can be fed by gravity.

13. Material distribution system (10) according to one of claims 7 to 12, characterized in that the main distribution device (24) which can be supplied by flow is designed as a distribution head.

14. Material distribution system (10) according to one of claims 5 to 13, characterized in that each row unit (46) has a singulation device (38) for singulating application material granules, wherein the application material (M1 , M2) is provided to the singulation devices (38) by intermediate storage units (36) of the respective row unit (46).

15. Material distribution system (10) according to one of claims 5 to 14, characterized in that each row unit (46) has a storage device (26) assigned to the flow-based feedable main distribution device (24) for depositing the dispensing material (M1) distributed by the flow-based feedable main distribution device (24); and a storage device (34) assigned to the gravity-based feedable main distribution device (30) for depositing the dispensing material (M1, M2) distributed by the gravity-based feedable main distribution device (30). includes.

16. Agricultural spreading machine, with a material distribution system (10) comprising several row units (46); characterized in that the material distribution system (10) is designed according to one of the preceding claims.

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