Rotary impact crusher

Claim 2

A rotary impact crusher comprising an impeller rotatable about a horizontal axis and provided with at least one axially extending impeller blade projecting outwardly of said impeller, and a cylindrically concave baffle defining a clearance with the blade orbit, said blade having, in the rotational direction, a leading face inclined into the direction of rotation at an angle of 25* to 45* to a radius running from said axis to said blade, said baffle having at least one such blade having one such leading face inclined counter to the direction of rotation of the impeller at an angle of 25* to 45* to a radius running from said axis to said blade of said baffle.

Claim 3

The rotary impact crusher defined in claim 1 wherein said blade of said impeller has a trailing face substantially parallel to said leading face.

Claim 4

The rotary impact crusher defined in claim 2 wherein said blade of said impeller has an outer face directed away from said axis and lying substantially along an arc of said orbit.

Claim 5

The rotary impact crusher defined in claim 1 wherein said impeller is provided with a channel partially receiving and mounting the impeller blade and a resilient band in said channel behind said impeller blade with respect to the rotational direction.

Claim 6

The rotary impact crusher defined in claim 4, further comprising a wedge locking said blade in said impeller channel.

Claim 7

The rotary impact crusher defined in claim 4 wherein said impeller blade has a longitudinally extending narrow waist between two relatively large outer portions each having said leading, trailing and outer face, whereby said impeller blade can be reversed in said channel and is adapted to be clamped at said waist.

Claim 8

The rotary impact crusher defined in claim 1 wherein said baffle is pivotal to vary said clearance.

Claim 9

The rotary impact crusher defined in claim 1 wherein said crusher further comprises a housing having a sidewall on the ascending side of said impeller with respect to the rotational direction thereof, a bottom wall, and an upright partition extending partially upwardly in said housing from said bottom wall and spaced from said sidewall and defining a particle-retaining compartment with said sidewall and defining a particle-retaining compartment with said sidewall adapted to accumulate said particles and form a relatively thick lining for said sidewall therefrom.

Claim 10

The rotary impact crusher defined in claim 8 wherein said impeller is of parrallelogrammatic cross section and said lining has a thickness of the order off 0.5 m., said partition having a height of at least 0.5 m. and lying within the projection of the impeller on said bottom wall while reaching upwardly to a distance between aboUt 1 and about 3 impeller diameters therefrom.

Claim 11

A rotary impact mill comprising a housing having an inlet for material to be crushed; an impeller rotatable about a horizontal axis; a plurality of angularly spaced axially extending blades mounted in said impeller and projecting beyond the periphery thereof, said blades describing a circular orbit centered on said axis; a plurality of braker plates spaced apart above said impeller and intercepting the material entrained thereby to comminute the same by impact forces; and an arcuate baffle extending beneath said impeller and along an arc segment, said baffle being provided with a mill plate cooperating with said impeller blades for crushing said material and with at least one baffle blade extending parallel to the axis and projecting in the direction of said orbit, said impeller blades having parallel leading and trailing faces inclined into the direction of rotation and said baffle blade having parallel leading and trailing faces inclined counter to the direction of rotation of said impeller, said faces including acute angles between 25* and 45* with a plane of the axis along a radius of the orbit.

Claim 12

A rotary impact mill comprising a housing having an inlet for material to be crushed; an impeller rotatable about a horizontal axis; a plurality of angularly spaced axially extending blades mounted in said impeller and projecting beyond the periphery thereof, said blades describing a circular orbit centered on said axis; a plurality of braker plates spaced apart above said impeller and intercepting the material entrained thereby to comminute the same by impact forces; and an arcuate baffle extending beneath said impeller and along an arc segment, said baffle being provided with a mill plate cooperating with said impeller blades for crushing said material and with at least one baffle blade extending parallel to the axis and projecting in the direction of said orbit, said impeller blades having parallel leading and trailing faces inclined into the direction of rotation and said baffle blade having parallel leading and trailing faces inclined counter to the direction of rotation of said impeller, said faces including acute angles between 25* and 45* with a plane of the axis along a radius of the orbit.