Bar type bearing structure for agricultural machines, such as precision sowers, and sower including said structure

A bar type bearing structure for agricultural machines, such as precision sowers, including at least one main beam having opposite axial ends, at least one of which is provided to be closed by a removable cover and at least one secondary beam which can be removably connected to an axial end of the main beam in axial extension thereof in place of the removable cover, the main beam and the at least one secondary beam being configured as closed tubular structures at least when they are connected to each other or when the main beam is closed by the cover, the main beam and the at least one secondary beam including arrangements for attachments for sowing elements and for a levelling system, the arrangements including on the main beam respective service pipes, wherein the service pipes are provided inside the tubular structure of the main beam and secondary beam and are provided with connectors for connecting the corresponding service pipes in the main beam and secondary beam to each other and connectors which are provided on the main beam and secondary beam in order to connect the service pipes to the respective sowing and levelling elements, wherein the at least one main beam is connected both to a first pneumatic system for the seed singularization and to a second pneumatic positive pressure system.

A bar type bearing structure for agricultural machines, such as precision sowers, including at least one main beam having opposite axial ends, at least one of which is provided to be closed by a removable cover and at least one secondary beam which can be removably connected to an axial end of the main beam in axial extension thereof in place of the removable cover, the main beam and the at least one secondary beam being configured as closed tubular structures at least when they are connected to each other or when the main beam is closed by the cover, the main beam and the at least one secondary beam including arrangements for attachments for sowing elements and for a levelling system, the arrangements including on the main beam respective service pipes, wherein the service pipes are provided inside the tubular structure of the main beam and secondary beam and are provided with connectors for connecting the corresponding service pipes in the main beam and secondary beam to each other and connectors which are provided on the main beam and secondary beam in order to connect the service pipes to the respective sowing and levelling elements, wherein two main beams are articulated to a carriage in an oscillating manner, and wherein the secondary beams are two beams, provided for connection to the corresponding axial end of the respective two main beams.