Agricultural implement and method for feeding granular material

1. Agricultural tool comprising a device for feeding granular material, comprising:

at least two metering devices;

a first drive device, which, via a pressurizing air duct, is connected to the metering devices for generation of a pressurizing airflow for pressurization of the metering devices, and

a central container, which is arranged to, via respective feed ducts, with the aid of a respective feed airflow, feed the material to at least one of the metering devices;

wherein the metering devices comprise a respective separator for separating the material from the feed airflow,

characterized by

a second drive device for generation of said feed airflow; and

a merging connection for merging at least a part (FL) of said feed airflow with the pressurizing airflow,

wherein said merging connection comprises a connection for merging an airflow outflowing from the respective separator with the respective pressurizing airflow.

2. Agricultural tool according to claim 1 , wherein a pressurizing air duct has a connection for airflow outflowing from the separator, which connection is situated upstream of the connection of the pressurizing air duct to the metering device.

3. Agricultural tool according to claim 1 , wherein the separator is directly connected to the pressurizing air duct.

4. Agricultural tool according to claim 1 , wherein the separator is connected to the pressurizing air duct via a merging duct.

5. Agricultural tool according to claim 1 , wherein the second drive device is arranged to produce a greater air pressure than the first drive device.

6. Agricultural tool according to claim 1 , wherein the metering device comprises a singling device for piece-by-piece dispensing of the material.

7. Agricultural tool according to claim 1 , wherein the metering device comprises a singling disc, which has a high-pressure side and a low-pressure side, and wherein the connection of the pressurizing air duct to the metering device is located on the high-pressure side of the metering device.

8. Agricultural tool according to claim 7 , wherein the metering device comprises an inlet, situated on the high-pressure side, for the granular material.

9. Agricultural tool according to claim 1 , wherein the first and second drive devices are drivable independently of each other.

10. Method for dispensing granular material, in an agricultural implement, comprising:

singling the granular material in a metering device and dispensing a series of individual granules,

with the aid of a first drive device, generating a pressurizing airflow for pressurization of the metering device,

characterized by

from a central container for the granular material, with the aid of a feed airflow, feeding the material to at least two metering devices,

generating the feed airflow with the aid of a second drive device, and

separating the material from the feed airflow, wherein a material flow and an airflow are produced, and merging at least a part of the airflow with the pressurizing airflow.

11. Method according to claim 10 , wherein the airflow is merged with the pressurizing airflow upstream of the inlet of the pressurizing airflow in the metering device.

12. Method according to claim 10 , wherein both the pressurizing airflow and the material flow are fed to a high-pressure side of a singling device.

13. Method according to claim 12 , wherein the pressurizing airflow and the material flow are fed via separate inputs.