FI57683B - SPRIDNINGSANORDNING - Google Patents

Description

PESISI ΓβΙ ANNOUNCEMENT, EXTENSION rn / 07 4§Ta l J (1) utlAggnincsskmft 5/6 0 6 * Sj6 C (45) Patent n: f »n ·: .. · Uy 10 10 .i 980, Patent cioddelat (51 ) Kv.ik.3 / mcct3 A Oi C 17/00 FINLAND — FINLAND (H) Ρκ * <«η» Λ «ηυ» -ρ «« «« ι »6ί« ΐηΙ 752791 (22) W * ke * nl * pUv »—Aiwdknfngtd« g 06.10.75 (23) AlkupUvt — GIM | h «tadtg 06.10.75 (41) Tullut iulklMk * l - Bltvlt offmcllg 07.04. 77

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Patent- och reglttantyralMn 'Aiuökan utljgdxh Utljikrlfun puMkarad 30.06.80 (32) (33) (31) Pyydnty atuolkau * —Begird prtorltat (71) (72) Taisto Harju, Perho, 69980 Möttönen, Olavi Harju, Perho, 6998 -Finland (Fl) (74) Oy Heinänen Ab (54) Spreader - Spridningsanordning The present invention relates to a spreader for a fertilizer or similar granular material, which comprises a horizontally rotating, winged and curved spreading disc drive device and a fertilizer feeder, such as a funnel or conveyor.

Today, the centrifugal spreading devices described above are commonly used for the application of forest fertilizers. The rotary spreading disc is obtained from the drive and is intended to give the fertilizer fed to the disc by the feeder a central movement by means of the vanes, so that the centrifugal force acting on it causes the fertilizer to fly over as wide an area as possible. The widespread spread of fertilizer is an essential factor in the cost of application work. In this sense, a wide variety of spreading discs have been developed, e.g., those with edges directed obliquely upwards to give the fertilizer the correct direction of movement. Furthermore, spreading discs are provided which are provided with radial vanes to increase the flight speed of the fertilizer.

* 2 57683

Despite the development work carried out, the known fertilizer and similar granular application equipment is not able to meet the requirements set for them, and a large part of forest fertilization has to be carried out with considerably more expensive application equipment, such as airplanes and pneumatically operated public application equipment. Insufficient power of centrifugal application equipment, i.e. the fact that the fertilizer is not spread over a sufficiently large area is a problem which has not yet been resolved. When, for example, the speed is increased, the granular fertilizer has been found to decompose into fine dust. In this case, the resistance of the medium caused by the air has become disproportionately high, and the scope of application has not increased significantly, however, as the operating power of the device has increased sharply. When the fertilizer is directed upwards at a sufficiently large angle by means of a spreading disc, the edges of which form the required angle with the horizontal, the sharply rising edges have prevented the required initial speed from being reached.

It is an object of the present invention to obviate the above drawbacks. The invention is characterized in that the edges of the spreading disc curve upwards so that the curvature rain decreases continuously towards the edges. This means that the angle between the edge of the upwardly curving spreading disc and the horizontal plane increases towards the edges, i.e. the slope of the tangent of the curved edge increases towards the edges.

The application device according to the invention has achieved absolutely excellent application results. In the experiments carried out, the granular fertilizer has been applied to a radius of up to 60 m using a spreading disc with a diameter of about 50 cm and a speed of 2000 rpm. With conventional centrifugal spreading devices, access! usually a few meters, and even with heavy, expensive pneumatic applicators, the application is at best about 20 meters. It is clear that the application device according to the present invention represents a truly significant development in its field. The device is suitable for placement even in heavy, e.g. tractor-driven fertilization units, which enables the inclusion of even large amounts of fertilizer and thus the fertilization of large forest areas at once, at the lowest cost.

The excellence of the applicator is based on its preferred disc-shaped shape 57683, which essentially involves a constriction of the radius of curvature of the edges towards the edges. The middle plate has a flat area where the fertilizer is fed by the feeder. In a flat area, the fertilizer is not affected by forces other than centrifugal force other than relatively much lower gravity, and thus the fertilizer is subjected to a rapid horizontal, outward movement along the surface of the plate.

As the radius of curvature of the plate decreases towards the edges below the flying fertilizer, the force changing the direction of movement of the granules due to the direction of the plate surface increases evenly towards the edges, leaving the granules unbroken despite the relatively high speed range of 800-2500 rpm, preferably . In this way, it is possible to give the fertilizer granule a sufficiently high initial speed and the correct starting angle, theoretically about ~ 45, to achieve the longest possible flight path.

The invention will now be described in detail by way of example with reference to an exemplary embodiment with reference to the accompanying drawing, in which

Fig. 1 shows an application device according to the invention with an application disc,

Fig. 2 shows a top view of the spreading disc shown in Fig. 1,

Fig. 3 shows a section along the line III-III in Fig. 2 and

Fig. 4 shows a section along the line IV-IV in Fig. 2.

The fertilizer or similar granular material spreading device according to the invention comprises a horizontal spreading disc 3 rotated by a drive device 4, to which the fertilizer is fed by means of a feed device 5 formed by a screw conveyor in the embodiment shown in Fig. 1. The fertilizer enters the conveyor 5 directly from the fertilizer hopper 6. The drive device 4 is formed by a motor which is arranged to drive both the screw conveyor 5 and to rotate it from the spreading disc 3 by means of power transmission members 7. The spreading device is further provided with wheels 8 and a fastening member 9 for conveying it, e.g. tractor-driven.

According to the invention, the radius of curvature of the edges 2 of the spreading disc 3 decreases towards the edges 57683, i.e. the slope of the tangent of the curved inner surface of the disc increases outwards as shown in Fig. 3. The spreading disc 3 is flat in the middle and provided with wings 1. Due to the partial flatness of the disc to a horizontal movement in the horizontal plane, which is intensified by the vanes 1, and then turns as it approaches the edge at an upward angle and flies to the sides. The flat central area of the spreading disc is about 1/3 of the diameter of the entire disc and the height of the edges 2 is about 7/100 of the diameter.

The vanes 1, which ultimately fly to the side of the fertilizer, are formed so as to extend from the flat area of the spreading disc 3 upwards to the outer edge of the disc upwards, being turned in the opposite direction of rotation. Furthermore, the vanes 1 are curved slightly curved in the direction of rotation of the dish and are provided with edges 10 which are likewise oriented in the direction of rotation of the dish.

The invention is, of course, not limited to the example shown, but its application may vary within the scope of the appended claims. In this case, the spreading disc can, for example, be constructed to rotate either counterclockwise or clockwise, in which case the positions of the vanes 1 and their edges 10 change. Likewise, the area of use of the device according to the invention can vary and it can be used in addition to forest fertilization, preferably e.g. fertilization of fields, usually seed application, application of other reactive substances such as sand or salt under certain special conditions, eg at airports, etc.