DE9003477U1 - Machine for shredding solid waste - Google Patents

Description

2930.1 - 1 - 12.03.1990

Description

The invention relates to a machine for shredding solid waste materials, in particular waste wood, according to the preamble of claim 1.

In such known shredding machines, the material to be shredded is intermittently pressed against the surface of the shredding roller by a slider that can be moved over the horizontally aligned bottom wall of the storage container. A hydraulic working cylinder with a corresponding time control is used to move this slider. In practice, good shredding performance is achieved with such shredding machines; however, due to their relatively high price, they are only used in larger woodworking workshops.

The present invention therefore aims to create a shredding machine according to the preamble of claim 1, which, despite its mechanically simpler construction, also provides good shredding performance.

This object is achieved according to the invention by a shredding machine according to claim 1.

It was found that if the angles specified in the characterizing part of claim 1 are observed, reliable gravity conveyance of the material to be shredded into the shredding area is achieved, but shredding of very hard parts of the material to be shredded is also ensured. Hard material parts do not accumulate in front of the shredding roller and are not thrown back into the interior of the storage container.

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With the shredding machine according to the invention, the entire hydraulic machine part can be eliminated, which allows a significant reduction in costs. 05

Advantageous further developments of the invention are specified in the subclaims.

In a shredding machine according to claim 5, a two-stage reduction is achieved: once by interaction of the shredding roller with the lower end of the bottom wall of the container, the other time by cooperation of the shredding roller with the sieve openings.

The development of the invention according to claim 6 is advantageous with regard to avoiding pieces of material being thrown upwards.

If the blade bodies of the shredding machine are designed according to claim 7, a very high shredding performance is achieved even in long-term operation. Since there is no surface contact between the end faces of the blade bodies and the waste pieces to be shredded, only a relatively small drive power is required to rotate the shredding roller.

In a shredding machine according to claim 8, the knife bodies can be repositioned once before they need to be resharpened.
30

The invention is explained in more detail below using an embodiment with reference to the drawing. In this drawing:

Figure 1: a schematic vertical section through a

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Machine for shredding wood waste;

Figure 2: a plan view of a part of the engagement area between a shredding roller and a rake body of the shredding machine according to Figure

1 in enlarged scale;

Figure 3: a longitudinal section through a knife body of the shredding rollers of the shredding machine according to Figure 1 along the section line III-III of

Figure 4; and

Figure 4: a plan view of the front face of the knife body according to Figure 3 (from the right).

Figure 1 shows a storage container 10 for waste wood to be shredded, which has side walls 12, a front wall 14, a rear wall 16 and a top wall 18. On its underside, the storage container 10 is closed off by a bottom wall 20, which slopes down at 45° from the rear wall 16 to the front wall 14.

A rake body 22 is attached to the front end of the bathing wall 20.

A crushing roller, designated 24 in total, runs in front of the rake body 22 with a clearance of approximately 10 to 20 mm. This is supported by lateral stub shafts 26 in bearings mounted on the side walls 12, not shown in the drawing.

As can be seen from the drawing, the diameter of the crushing roller 24 is selected so that the section on the right in Figure 1 runs with a small clearance in front of the inner surface of the front wall 14. In addition, the distance between

90 02 V IJ

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the axis of the crushing roller 24 and the sloping plane defined by the bottom wall 20 are selected such that the angle w between the plane of the bottom wall 20 and a tangential plane 28 placed on the crushing roller 24 at the free edge of the rake body 22 is approximately 60".

The shredding roller 24 is driven by an electric motor arranged on the rear side wall 12 via a belt drive 32.

A substantially semi-cylindrical sieve body 34 extends parallel to the crushing roller 24 at a distance of approximately 20 mm. Its sieve openings, which are not shown in detail in the drawing, typically have a diameter of approximately 40 mm with a distance between the opening centers of approximately 100 mm.

Parallel to the sieve body 34, a collecting channel 3ω for the shredded wood waste is provided, in which a screw conveyor 38 rotates. This conveys the wood flour obtained there to a silo or a briquetting press,

As can be seen from Figure 3, the rake body 22 has a plurality of consecutive rectangular isosceles teeth 40. The crushing roller 24 has a roller core 42 which is obtained by placing a plurality of discs 44 next to one another, each of the discs having an edge with a rectangular isosceles cross-section. 30

Between each two adjacent disks 44, knife carriers 46 are welded, to which knife bodies 50 are fastened using fastening screws 48.

As can be seen from Figures 3 and 4, the knife bodies 50 have a spherically concave front surface 52 and a central threaded bore 54, which is engaged by the associated fastening screw 48.

Po 03

Claims (1)

2930.1 - 1 - 12.03.1990 Expectations 1. Machine for shredding solid waste materials, in particular waste wood, with a storage container (10) for the material to be shredded, with a shredding roller (24) rotating in the storage container (10) at its bottom wall (20), which has a roller core (42) and a plurality of blade bodies (50) distributed on it, and with conveying means for moving the material to be shredded against the shredding roller (24), characterized in that the conveying means are formed by the bottom wall (20) of the storage container (10) which is set at an angle of approximately 30 to approximately 60" to the horizontal, and the shredding roller (24) is arranged at the lower end of the bottom wall (20) in such a way that the angle (w) between the bottom wall plane and a tangential plane (28) placed in the vicinity of the bottom wall (20) to the shredding roller (24) is approximately 60 to about 120°. 2. Machine according to claim 1, characterized in that the angle of attack of the bottom wall (20) is approximately 45". 3. Machine according to claim 1 or 2, characterized in that the lower end of the bottom wall (20) carries a flush-mounted rake body (22). 4. Machine according to claim 3, characterized in that the blade bodies (50) of the shredding roller (24) run with a clearance of about 10 to about 20 mm between the teeth (40) of the rake body (22). 5. Machine according to claim 4, characterized in that starting from the lower bottom wall end, a partially cylindrical sieve body (34) extends under the crushing roller (24) 2930.1 - 2 - 12.03.1990 whose sieve openings have a diameter
which is smaller than the passage between two adjacent teeth (40) of the rake body (22) and the roller core (42) of the shredding roller (24).
05 6. Machine according to one of claims 1 to 5, characterized in that the Section of the crushing roller (24) with a small clearance over the inner surface of a side container wall (14)
of the storage container (12). 7. Machine according to one of claims 1 to 6, characterized in that the end face (52) of the knife body (50) is concave.
15 S. Machine according to claim 7, characterized in that
the knife bodies (50) are diamond-shaped when viewed from above or square and each has a fastening screw (48) engaging a central threaded hole (54)
connected to the roller core (42). 900 1 kl-'}