Twin-disc centrifugal spreader

Abstract

A twin-disc centrifugal spreader for fertilizer with centrifugal discs (5) which are arranged on a support frame so as to be driven in rotation and are fitted with throwing elements, to which the fertilizer to be distributed is fed in adjustable quantities via dosing elements (6), and with disc protection elements (7) arranged at least on the underside of the centrifugal discs (5) and at a distance from the underside of the centrifugal discs (5), which extend at least from the front side of the centrifugal disc (5) to beyond the axis of rotation of the disc (5), characterized in that a plurality of lamellar recesses (8) are arranged in the protection elements (7), that the recesses (8) run transversely to the direction of travel, that the lamellae (9) of the lamellar recesses (8) are set at an angle running from the front-top to the rear-bottom.

Description

[0001] The invention relates to a two-disc centrifugal spreader for fertilizer according to the preamble of patent claim 1.

[0002] Such a spreader is known, for example, from EP 1 068 783 B1. In this spreader, the spreading discs are arranged in a wheel-arch-like guard. The disc guard element on the underside of the centrifugal discs extends at least from the front of the centrifugal disc to beyond the disc's rotation axis. These guard elements are arranged either horizontally or with a slight downward slope. Especially when the fertilizer to be spread is slightly moist, it remains on the lower guard elements, even if they are positioned at a slight angle.

[0003] Such guards are provided for both mounted and trailed centrifugal spreaders. On trailed centrifugal spreaders, these guards also serve as a protective element to prevent the leading wheels of the trailed spreader from throwing debris picked up from the ground against the underside of the spreading discs or into the path of the spun-out fertilizer. This would otherwise impair even distribution.

[0004] The object of the invention is to ensure in a simple manner that, on the one hand, the protective function of the protective elements is maintained and, on the other hand, that fertilizer remains on the lower disc protective elements.

[0005] This object is achieved according to the invention in that a plurality of slat-like recesses are arranged in the protective elements, that the recesses run transversely to the direction of travel, and that the slats of the slat-like recesses are inclined from the front-top to the back-bottom. As a result of these measures, the fertilizer, which would otherwise remain on the protective elements, can fall through the recesses downwards. On the other hand, the slats of the slat-like recesses prevent particles thrown up by wheels rolling on the ground, such as dirt particles, from hitting the centrifugal discs and getting into the trajectory of the fertilizer particles thrown off by the centrifugal discs.

[0006] A sufficiently stable design of the slat-like protective elements can be achieved in a simple manner by connecting surface elements extending in the plane and projecting forward to the upper side of the inclined slats.

[0007] An advantageous alignment of the slats is achieved by arranging the slats in such a way that, viewed from the front-bottom at an angle of approximately 45° diagonally upwards, a closed surface area is created.

[0008] Further details of the invention can be found in the remaining claims, the example description and the drawings. Fig. 1 the two-disc spreader designed as a trailed fertilizer spreader in a perspective view diagonally from the rear above in a partial view and Fig.2 the centrifugal fertilizer spreader in the same view, with the protective element on the left side in the direction of travel shown in partial section.

[0009] The two-disc spreader, designed as a trailed fertilizer spreader, comprises the hopper 1 and the chassis 2 with wheels 2. Located at the rear of the hopper is the two-disc spreading mechanism 3, which has two centrifugal discs 5 driven in opposite directions of rotation and equipped with throwing vanes 4. Of the centrifugal discs 5, only the left-hand centrifugal disc 5 is shown. Material is fed to the centrifugal discs in adjustable quantities from the metering device 6 located above the centrifugal discs 5 and on the rear of the hopper. The fertilizer to be spread is distributed over the soil surface by the throwing vanes 4 via the centrifugal discs 5.

[0010] On the underside, plate-shaped protective elements 7 are arranged at a distance from the underside of the centrifugal discs 5, which extend from the front side of the centrifugal disc 5 to the rear beyond the axis of rotation of the centrifugal disc.

[0011] As can be seen from the drawings, several slat-like recesses 8 are arranged in the protective elements 7. These recesses 8 are arranged transversely to the direction of travel. The slats 9 of the slat-like recesses 8 are inclined from the front-top to the rear-bottom. Adjoining the upper side of the inclined slats 9 are surface elements 10 extending in the plane and projecting forward, which are sub-regions of the plate-shaped protective elements 7. The slats 9 are bent downward from the flat surface, creating the recesses 8.

[0012] The slats 9 are arranged relative to one another in such a way that, viewed from the front and bottom at an angle of approximately 45° upwards, a closed surface area is created. This ensures that particles picked up from the ground by the wheels 2, such as dirt particles thrown from below against the protective elements 7, cannot pass upwards through the recesses 8.

[0013] As can easily be seen, due to the lamellar design of the protective elements 7, fertilizer particles remaining on the plate-shaped protective elements 7 can fall downwards through the recesses 8.

Claims

[1] Twin-disc centrifugal spreader for fertilizer with centrifugal discs (5) arranged on a support frame so as to be driven in rotation and equipped with throwing elements, to which the fertilizer to be distributed is fed in adjustable quantities via dosing elements (6), and disc protection elements (7) arranged at least on the underside of the centrifugal discs (5) and spaced from the underside of the centrifugal discs (5), which extend at least from the front side of the centrifugal disc (5) to beyond the axis of rotation of the disc (5), characterized by that a plurality of slat-like recesses (8) are arranged in the protective elements (7), that the recesses (8) run transversely to the direction of travel, that the slats (9) of the slat-like recesses (8) are set diagonally from the front-top to the rear-bottom. [2] Twin-disc centrifugal spreader according to claim 1, characterized bythat surface elements (10) extending in one plane and projecting forwards are connected to the upper side of the obliquely running slats (9). [3] Twin-disc centrifugal spreader according to claim 1, characterized by that the slats (9) are arranged relative to one another in such a way that, viewed from the front-bottom at an angle of approximately 45° diagonally upwards, a closed surface area is produced.

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