FI95950C - Sprinkler plate for winter maintenance sprinkler - Google Patents

Abstract

A spinner disc (1), driven in a rotary manner about an essentially vertical rotational axis (7), for a winter-service grit spreader for spreading granulated gritting material is provided on its top side with throwing blades (2, 3, 4) which run essentially radially to the rotational axis and have different radial lengths (11, 12, 13). Gritting material is continuously fed to the spinner disc (1) from a supply container via a drop tube by means of a conveying device. In order to improve such a spinner disc (1) in such a way that, irrespective of the spreading widths set in each case as a function of rotational speed, a uniform distribution of the gritting material can be achieved over the entire spreading width, the radially inner ends of all throwing blades (2, 3, 4) lie on the same radius (R) and the radially outer ends (2/1, 3/1, 4/1) of the throwing blades (2, 3, 4) lie on different radii, the outer edge (11) of the spinner disc (1) in the radial direction towards the rotational axis (7) terminating flush with the outer ends (2/1, 3/1, 4/1) of the individual throwing blades (2, 3, 4). <IMAGE>

Description

5,95950

Sprinklerstallrik för vinterunderhällspridningsanordningar

The invention relates to a spreading disc for a winter maintenance sander for spreading granular spreading material, which disc is rotatably rotated about a substantially vertical axis of rotation and is provided

Spreading discs according to the object (Firmenschrift Fa. Pietsch KG GmbH & Co) are known, above which trenches of different lengths are traced, which extend substantially radially with respect to the axis of rotation of the spreading disc. The sprinkler plate has a completely circular outer contour with which the ends outside this sprinkler plate are firmly locked. Due to the different lengths of the throw buckets, the inner ends are located with different radii. Six throw buckets are traced in the known sanding discs, all of which are of different lengths below each other, the length of the longest throw buckets corresponding to approximately one third of the radius of the sanding disc and the length of the shortest sanding disc approximately one quarter of the length of the sanding disc.

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A bounce piece is traced above the scattering plate, on the circumference of which a plurality of sawtooth-shaped teeth are traced, the radially outer tooth ends of which are located in the direction of rotation behind the radially inside tooth bases.

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A radial gap is traced between the bounce piece and the throw buckets, the size of which is between one third and approximately half of the radius of the sanding disc, depending on the length of the throw bucket.

2 95950 In use, the spreading material hits the granulation chute into the bouncing body, which centrifuges the granulated material outwards freely above the spreading plate between the bouncing body and the casting buckets. There, due to the low friction prevailing on the flat surface of the sanding disc, the sanding material decelerates only 5 strongly and with it uncontrollably in the circumferential direction, which initially causes only a small radial acceleration. The scattering material adheres to the radial outer areas of the throw buckets and accelerates radially outward. Due to the different lengths of the throw buckets, they are adhered at different times by different amounts of sanding agent, which accelerates radially outwards towards the edge of the sanding disc and slides out radially outwards. Since the outer end edges of the buckets of different lengths have the same radius, the scattering material accelerates to approximately the same radial speed so that the throwing distances of the buckets of different lengths are approximately equal.

With low speeds and, above all, with the moistened spreading material, there is a risk that the spreading material adheres to the area between the bounce piece on the sanding disc and the throw buckets, scales it and occasionally adheres uncontrollably to the throw buckets so that the sanding material cannot be sanded.

20 In addition, the sanding density at the edge of the road surface to be sanded, such as the edge of the street, is substantially denser than in the area behind the sander equipped with such a sanding disc.

The object of the invention is to improve the spreading board 25 according to the above-mentioned type so that an even distribution of the sanding material can be achieved for the entire sanding width, regardless of the sanding widths depending on the respective set speeds.

The object is achieved according to the invention in that the scattering plate is provided with three groups of throwing buckets, each comprising three throwing buckets of different radial lengths, so that the radially inner ends of all throwing buckets start and that the outer edge of the scattering plate binds to the outermost ends of the individual throw buckets at different radii in a radial direction with respect to the axis of rotation.

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Because the contour of the scattering plate is adapted to the different end radii of the individual scoops, different scattering compartments with different throwing distances, different widths and angular positions with respect to the center plane of the scattering plate through. Since the inner ejection bucket ends are located on the same radius, the sanding agent can also adhere to the individual ejection buckets in a controlled manner, thereby achieving an even position of the individual spreading material compartments.

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By means of the embodiment according to claims 2 and 3 of the invention, it is achieved that the scattering material impinging on the scattering plate from the banging surfaces of the central tooth cone immediately engages the scoops and accelerates evenly outwards towards the edge of the sanding plate.

20

By means of the embodiment according to claim 4 of the invention, it is achieved that the scattering agent arrives as completely, directly and without interference as possible on the bounce surfaces of the central tooth cone.

The embodiment according to claim 5 ensures that the sanding material does not rise above the throw buckets and does not exceed their upper edge.

The invention is described in more detail below by means of a drawing. The drawing shows the following:

Figure 1 is a plan view of a scattering plate; 4,95950

Figure 2 shows a partial section II-II of the scattering plate of Figure 1;

Figure 3 shows various alternatives from the outline of the sanding disc; Figure 4 shows a sanding pattern of a sanding disc.

Figure 1 shows a spreading plate 1 with three groups above it, each consisting of three, i.e. a total of nine, circumferentially evenly distributed throwing buckets 2, 3 and 4. The spreading plate 1 is fixed by a hub 5 to a substantially 10 vertical axis 6 which can be rotatably driven by a rotary shaft 7 around. Above the scattering plate, a conical tooth cone 8 truncated coaxially with the axis of rotation 7 is traced coaxially with a circumferential surface of eighteen sawtooth teeth 9. The scattering plate 1 has a planar circular segment 10 .

The annular zone of the sanding disc 1 radially outside between the tooth cone 8 and the outer edge 11 has a conical angle α of about 5-10 ° with respect to the horizontal plane 12 in which the circular segment 10 of the sanding disc 1 is located so that the outer edge 11 of the sanding disc 1 is vertically .

Above the tooth cone 8, a fluid reservoir 13 provided with a fluid supply device 14 is arranged coaxially with the axis of rotation 7 25.

A filling chuck 15 is traced on the side j diametrically opposite the liquid supply device 14 of the liquid container 13.

Hammaskartion 8 teeth 9 are arranged so that their ends 16 of the tooth 30 lie in the direction of arrow 17 the direction of rotation of the respective position of the tooth 18 at the front. 17 in the rotational direction of the arrow located in front of the tooth flanks 19 functioning kimmahduspintoina hammaskartioon 8-relevant hiekoitusainekselle.

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The radially inner ends of the throwing buckets 2,3,4 terminate in a radius R which is smaller than the radius of the tooth cone 8 or the circle segment 10. The throwing buckets 2,3,4 each close seamlessly on one tooth side 19 of the tooth cone 8 and extend in the direction of the tooth sides 19. The tooth sides 19 5 of the tooth cone 8 thus form a radial guide surface 20 for the sanding material, closed with the buckets 2,3,4.

The throwing buckets 2,3,4 have different lengths 12,13,14 so that their radially outside ends 2/1, 3/1, 4/1 are located on different radii R2, R3, R4 relative to the axis of rotation 7. 2,3,4 Heittokauhat is structured to then successively so that the direction of the arrow 17 the direction of rotation of the two longest heittokauhaa with a central length 13 of casting ladle 3, and this provided the shortest length of the casting ladle 14 4.

The outer edge 11 surrounding the sanding plate 1 is then arranged in different lengths of the throw buckets 15, 2,3,4 so that it closes firmly in the radial direction with the outer end edges 2/1, 3/1 and 4/1 of the throw buckets 2,3,4. The circular segments 21, 22 and 23 between the outer end edges 2/1, 3/1 and 4/1 of the individual casting buckets 2,3,4 of the sanding disc 1 extend arcuately and move continuously inside each other.

20

As can be seen from Figure 3, these circular segments 21,22,23 can • also connect the outer ends 2/1, 3/1 and 4/1 to each other in the form of a straight arc 24 or a concave arc 25 or a convex arc 26.

25 Heittokauhoilla 2,3,4 is a cross-sectional profile of which extends about two-thirds of the original height above the hiekoituslautasen outwardly from substantially the axis: the direction of the rotation axis 7, i.e., substantially vertically upwards, and are bent yläkolmasosastaan arrow 17 the direction of rotation of the circle periphery of the quarter-like side.. The outer end edges 2/1, 3/1 and 4/1 extend from the bottom 30 upwards axially with respect to the axis of rotation 7 or at right angles to the upper surface of the sanding disc. However, this advancement of the end edges 2/1, 3/1 and 4/1 affects the sanding pattern only to a very small extent.

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Since the throwing buckets 2,3,4 with their radially outer ends 2/1, 3/1 and 4/1 terminate in different radii, it is achieved that each throwing bucket 2,3,4 produces a second sanding pattern with respect to the throwing direction and the throwing distance, i.e. a second sanding sector. (Figure 4). The sanding agent hitting the tooth cone 8 bounces off the tooth sides 19 of the teeth 9 of the tooth-5 cone 8 on the upper surface of the sanding disc 1. In order for the sanding material to reach the tooth cone 8 as undisturbed as possible, the throwing buckets 2,3,4 are provided with recesses 2/2, 3/2, 4/2 at their upper edge in the area of their joint of the tooth flanks 19. There, it adheres perfectly and regularly to the inner end portions of the throwing buckets 2,3,4 and accelerates in a steady stream radially outward. 10 This radial acceleration takes place until the sanding material leaves the discharge buckets 2,3,4 and at the same time from the sanding disc 1 to the outer end edges 2/1, 3/1 and 4/1. At this time of exit, the radial deceleration also ceases, with the result that, because the throw buckets 2,3,4 are of different lengths, i.e. end in different radii, the radial velocity of the sanding material is different depending on which throw bucket 15,4,4 of the sanding material was accelerated.

Due to the different lengths of the throw buckets 2,3,4 and as the radial acceleration increases with respect to the radius, the scattering material leaving the scattering plate with a larger radius not only accelerates over a longer period of time, but also accelerates further with an outwardly increasing radial force. As a result, the radial speed is at its smallest with the short throwing bucket 4 and the radial speed with the longest - with the throwing bucket 2 at its maximum, so that different throwing distances are achieved.

Since the point of encounter of the granular material on the scattering plate 1 is the same for all throwing buckets 2,3,4 and the radial acceleration is substantially the same radius for all throwing buckets 2,3,4, the throwing direction and throwing angle of the individual throwing buckets 2,3,4 are also different because, as said , in the case of short spreading buckets 4 ί the spreading material leaves the spreading disc earlier than in the case of longer casting buckets 3 or 2, the spreading material sectors of which start from a later turning angle position.

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7 95950 The deposition of the sanding patterns produced in this way, i.e. the sanding agent compartments 28.29, results in the distribution of at least almost the same shape of the sanding material on the roadway.

5 Crucial to achieving a uniform distribution of the scattering material on the roadway is that the scattering material from all throw buckets 2,3,4 reaches the same radius as possible and accelerates radially and leaves the scattering plate after different radial acceleration distances, i.e. at different radial speeds at the end of these acceleration distances. Only in this way is it possible to produce defined sanding patterns, which, however, also depend on the structure of the sanding material.

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Claims (4)

A spreading disc (1) for a winter maintenance spreading device for spreading granular spreading material, which spreading disc (1) is driven to rotate about a substantially vertical axis of rotation (7) and is provided on its upper side with throwing scopes (2,3,4). substantially radially in relation to the axis of rotation (7), which throws scoops from its common inner radius (R) of different radial lengths (12,13,14) and to which the spreading material is continuously guided by means of a conveying device from a storage container via a drop tube, characterized in that the spreading disc (1) is provided with three groups of throwing scoops (2,3,4), each of which comprises three throwing scoops of different radial lengths (12,13,14) so that the ends of all throwing scoops ( 2,3,4) located radially inset from the teeth (9) of a central tooth cone (8), the tooth surfaces (19) located mainly in the direction of rotation of the tooth cone acting as electricity the aesthetic surfaces of the spreading material entering the tooth cone (8) and the outer edge (11) of the spreading disc (1) terminating in a connecting manner at the outer ends (2/1, 3/1, 4/1) of the the individual throwing cups (2,3,4) located at different radii (R2, R3, R4) in a radial direction relative to the axis of rotation (7). Spreading plate according to claim 1, characterized in that each of the throwing cups (2,3,4) adjoins from its inner ends in an elastic surface (19) of the tooth cone (8) leaking in the direction of the elastic surfaces (19) and together with the elastic web in question (19) forms a closed guide surface (20) for the spreading material. Spreading plate according to claim 1 or 2, characterized in that the throwing cups (2,3,4) are provided with elastic surfaces (19) at their connection area at their upper edge with recesses (2/2, 3/2, 4/2). . Spreading disc according to any of claims 1-3, characterized in that the throwing cups (2,3,4) extend to the spreading disc (1) from the connection area substantially parallel to the axis of rotation (7) and that the upper end edges are bent forwardly in the rotation.