Roller crusher having at least one roller comprising a flange

Abstract

The invention relates to a roller crusher having two generally parallel rollers arranged to rotate in opposite directions, towards each other, and separated by a gap, each roller having a first end and a second end. The roller crusher comprises a flange attached to at least one of said ends of one of said rollers. The flange extending in a radial direction of said roller, and has a height above an outer surface of said roller which is sufficient to extend across said gap substantially along a nip angle of said roller crusher.

Claims

1. A roller crusher having two parallel rollers arranged to rotate in opposite directions, towards each other, and separated by a gap, each roller having a first end and a second end, said roller crusher comprising: a flange, formed from a first material, attached to an outer surface of one of said rollers near at least one of said ends of one of said rollers, said flange extending in a radial direction of said roller; said flange having a height above the outer surface of said roller which is sufficient to extend across said gap along a nip angle of said roller crusher; wherein said flange includes a wear-resistant structure provided on an inside surface of the flange to protect said flange from wear, the wear-resistant structure including at least one mounting post configured to be received in a mounting hole formed on the inside surface of the flange, the wear-resistant structure being formed from a second material different from the first material and harder than the first material.

2. The roller crusher according to claim 1, wherein said height is sufficient to extend across said gap substantially along a nip angle of said roller crusher, when said gap is set to a maximum operational gap.

3. The roller crusher according to claim 1, wherein said flange is positioned at the first end of the roller and said wear-resistant structure extends from the inside of the flange toward the second end of the roller.

4. The roller crusher according to claim 3, wherein said wear-resistant structure is arcuate.

5. The roller crusher according to claim 3, wherein said wear-resistant structure is continuous around the entire flange.

6. The roller crusher according to claim 3, wherein said wear-resistant structure is intermittent.

7. The roller crusher according to claim 1, wherein said flange is divided into a plurality of segments.

8. The roller crusher according to claim 1, wherein said flange is attached to said roller by means of adhesive, bolting, screwing, welding, brazing or any other suitable fastening technique.

9. The roller crusher according to claim 1, comprising a flange attached to each end of one of said rollers, respectively.

10. A roller crusher having two parallel rollers arranged to rotate in opposite directions toward each other, the rollers being separated by a gap, each roller having a first end and a second end, the roller crusher comprising: a flange attached to an outer surface near a first end of one of the rollers, the flange extending in a radial direction of the roller to a height above the outer surface of the roller, wherein the flange extends across the gap along a nip angle of the roller crusher; a wear-resistant structure provided on an inside surface of the flange and extending from the flange toward the second end of the roller, the wear-resistant structure including at least one mounting post configured to be received in a mounting hole formed on the inside surface of the flange, the wear-resistant structure being formed of a material harder than the flange to protect the flange from wear.

11. The roller crusher of claim 10 further comprising: a second flange attached to the second end of the one of the rollers, the second flange extending in the radial direction of the roller to a height above an outer surface of the roller, wherein the flange extends across the gap along a nip angle of the roller crusher; and a wear-resistant structure provided on an inside surface of the second flange and extending from the second flange toward the first end of the roller, the wear-resistant structure including at least one mounting post configured to be received in a mounting hole formed on the inside surface of the flange, the wear-resistant structure being formed of a material harder than the second flange to protect the second flange from wear.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above, as well as additional objects, features and advantages of the present invention, will be better understood through the following illustrative and non-limiting detailed description of preferred embodiments of the present invention, with reference to the appended drawings, where the same reference numerals will be used for similar elements, wherein:

(2) FIG. 1 is a perspective view of a roller crusher according to one exemplary embodiment of the invention,

(3) FIG. 2a is a perspective view of a roller of the roller crusher having two flanges extending in a radial direction of the roller,

(4) FIG. 2b is a perspective view of a segment of one of the flanges in FIG. 2a,

(5) FIG. 3a is a perspective view of a roller of a roller crusher having two flanges extending in a radial direction of the roller,

(6) FIG. 3b is a perspective view of a segment of one of the flanges in FIG. 3a,

(7) FIG. 4a is a perspective view of a roller of a roller crusher having two flanges extending in a radial direction of the roller,

(8) FIG. 4b is a perspective view of a segment of one of the flange in FIG. 4a, and

(9) FIG. 5 is a side view of the roller crusher in FIG. 1, when having one flange only.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

(10) FIG. 1 illustrates a roller crusher 1 according to one exemplary embodiment of the invention. The roller crusher 1 has two generally parallel rollers 2 arranged to rotate in opposite directions, towards each other, and are separated by a gap. Each roller 2 has a first end 3 and a second end 4. The roller crusher 1 comprises a flange 5 attached to the first and second end 3, 4 of one of the two rollers 2 of the roller crusher 1. The flanges 5 extend in a radial direction of the roller 2 and have a height H above an outer surface 6 of the roller which is sufficient to extend across the gap substantially along a nip angle of the roller crusher 1. The height H is sufficient to extend across the gap substantially along a nip angle of the roller crusher 1 when the gap is set to a maximum operational gap. The flanges 5 are plain and will help maintaining material to be crushed on the outer roller surface 6. That is to say, due to the flanges 5, the material is prevented from falling over the edge of the roller 2. The flanges will also facilitate the providing of an autogenous protection layer on the rollers, consisting of the material to be crushed. The flanges 5 are divided into a plurality of segments 7 in order to facilitate the manufacturing and mounting of the same. The flanges 5 are, for example, attached to the roller 2 by means of adhesive, bolting or screwing.

(11) In FIG. 2a, the roller 2 of the roller crusher 1 having a flange 5 on each end 3, 4 and extending in a radial direction of the roller 2 is illustrated. The flanges 5 are plain and will eliminate the weakness spot at the edge of the rollers 2. The flanges 5 will help maintaining the material on the outer surface 6 of the rollers 2 and prevent the material from falling over the edge of the roller 2. This will in turn increase the pressure on the material towards the gap between the rollers 2 at the edge of the rollers 2.

(12) FIG. 2b illustrates a segment 7 of the flange 5 in FIG. 2a. The segment 7 is formed from a second material that is harder than the first material that forms the flange 5. The segment 7 includes at least one mounting post 10 that is sized to be received within a corresponding mounting hole 12 formed in the inside surface of the flange 5. The interaction between the mounting post 10 and the mounting hole 12 secures the segment 7 to the flange 5 such that the segment 7 protects the flange 5 from wear. As stated above, the flanges 5 are divided into segments 7 in order to facilitate the manufacturing and mounting of the same. However, the flanges 5 can naturally be designed as one single unit.

(13) In FIG. 3a, a second embodiment of the roller 2 of the roller crusher 1 is illustrated. Here, the flanges 5 comprise a feeding structure 8 on the inside of the flanges 5. The structure 8 extends from the inside of the flange 5 towards the other end 3, 4 of the roller 2. The structure 8 is continuous and arcuate. The structure 8 will increase the pressure on the material towards the gap between the rollers 2 at the edge of the roller 2. The material will engage with the structure 8 and be pressured towards and through the gap, i.e. the material will be choke-fed into the gap.

(14) FIG. 3b illustrates a segment 7 of the flange 5 in FIG. 3a. Naturally, also the flanges 5 according to this second embodiment can be designed as one single unit.

(15) In FIG. 4a, a third embodiment of the roller 2 of the roller crusher 1 is illustrated. Here, the flanges 5 also comprise a feeding structure 8 on the inside. However, the structure 8 according to this embodiment is intermittent.

(16) FIG. 4b illustrates a segment 7 of the flange 5 in FIG. 4a. Naturally, also the flanges 5 according to this third embodiment can be designed as one single unit.

(17) In FIG. 5, a side view of the roller crusher 1 is illustrated in order to facilitate the understanding of the nip angle . A first straight line has been drawn from the centre of the right roller 2 to and through a point on the left roller 2, at which point an active engagement between the left roller 2 and the material to be crushed is started. The nip angle is measured between the horizontal plane extending through the centre of the left and right roller, and said first straight line. It is the smaller of the two possible angles which can be obtained in accordance with the definition presented above. In the embodiment illustrated in FIG. 5, the height H of the flange 5 above the outer surface 6 of the roller 2 is sufficient to extend across the gap substantially along the nip angle of the roller crusher 1.

(18) During the crushing operation of the roller crusher 1, the material to be crushed is transported to the roller crusher 1 by means of a feeding arrangement and is introduced into a funnel of the feeding arrangement. The material to be crushed is then fed to the gap between the two rollers 2 of the roller crusher 1. The flange 5 of the roller crusher 1 will help maintaining the material on the outer roller surface 6 of the rollers 2 and help increasing the pressure on the material towards the gap between the rollers throughout the width of the rollers 2, especially at the edge of the rollers 2. When the material has been crushed by means of the two parallel and rotating crushing rollers 2, it travels by gravity out of gap in order to be transported from the unit.

(19) The invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined below.

(20) For instance, the structure may be of any suitable size and shape, for example straight, inclined, curved, ring shaped, double or single.

(21) The size and shape of the flanges may also be varied to include a plurality of structures. If the flanges comprise a plurality of structures, these structures may be of different size and shape.