Abstract An impact crusher is disclosed having a rotor with four hammers equally spaced around the periphery thereof. Two of the hammers, diametrically opposite each other, are each fitted in slots and have a leading hammer face of conventional radial length while the other two hammers are substantially shorter. The shorter hammers each comprise an integral formation with a spiral body extension that projects progressively farther radially outward beginning at the leading peripheral edge of one slot and reaching maximum outward projection at the back wall of the other slot. The two shorter hammers each have a leading surface having a flat portion substantially perpendicular to the periphery of the spiral body extension from which the flat portion projects, and terminates with a radially outer edge which traces a common circle with outermost edges of the two longer hammers. Each of such short hammers strikes, deflects and throws pieces of rock of a size which in the absence of such short hammers can slide along the periphery of the rotor from the trailing side of one long hammer to the leading hammer face of the other long hammer, and which if permitted to occur can result in the crusher discharging such pieces which may sometimes be more than three times the size the crusher is set to produce.
A four hammer rotor for an impact crusher having a housing enclosing and supporting the rotor, a drive for turning the top of the rotor away from a material inlet opening in the housing, and target members spaced from the rotor opposite the inlet opening for disintegrating input material struck and thrown by the hammers to impact against the target members, with said rotor comprising: a. an elongated central body portion with a pair of axially extending peripheral slots diametrically opposite each other and two diametrically opposed generally spiral body extensions each projecting progressively farther radially outward beginning at a location which is ahead of one slot in the direction of rotor rotation and reaches maximum radial projection at a terminus defining a face planar with the back wall of the other slot; b. first and second hammer means each comprising a bar arranged in one of said slots and projectng outwardly thereof with a leading hammer face extending outwardly at least as far as the radially outer edge of said planar face; and c. third and fourth hammer means located diametrically opposite each other and between the first and second hammer means, and with each of said third and fourth hammer means projecting from one of the rotor body spiral extensions with a leading surface radially shorter than the hammer faces of the first and second hammer means and having a flat portion substantially perpendicular to the periphery of the spiral extenson, and with the flat portion terminating with a radially outer edge which traces a common circle with radially outer edges of the first and second hammer means upon rotation of the rotor.
Claim 2
Dependent Claim
275 words
A four hammer rotor for an impact crusher having a housing enclosing and supporting the rotor, a drive for turning the top of the rotor away from a material inlet opening in the housing, and target members spaced from the rotor opposite the inlet opening for disintegrating input material struck and thrown by the hammers to impact against the target members, with said rotor comprising: a. an elongated central body portion with a pair of axially extending peripheral slots diametrically opposite each other and two diametrically opposed generally spiral body extensions each projecting progressively farther radially outward beginning at a location which is ahead of one slot in the direction of rotor rotation and reaches maximum radial projection at a terminus defining a face planar with the back wall of the other slot; b. first and second hammer means each comprising a bar arranged in one of said slots and projectng outwardly thereof with a leading hammer face extending outwardly at least as far as the radially outer edge of said planar face; and c. third and fourth hammer means located diametrically opposite each other and between the first and second hammer means, and with each of said third and fourth hammer means projecting from one of the rotor body spiral extensions with a leading surface radially shorter than the hammer faces of the first and second hammer means and having a flat portion substantially perpendicular to the periphery of the spiral extenson, and with the flat portion terminating with a radially outer edge which traces a common circle with radially outer edges of the first and second hammer means upon rotation of the rotor.
Claim 3
Dependent Claim
55 words
A rotor according to claim 1 in which the location from which the progressively farther projection of each generally spiral body extension begins, is at the leading peripheral edge of the saiD one slot, and the said third and fourth hammer means each project from the midportion of one of the rotor body spiral extensions.
Claim 4
Dependent Claim
28 words
A rotor according to claim 2 in which said third and fourth hammer means each comprise an integral formaton with the spiral body extension from which it projects.
Claim 5
Dependent Claim
47 words
A rotor according to claim 3 in which said radially outer edge of the third and fourth hammer means is a wear resistant bar welded thereto in the plane of the flat portion of the leading surface of each of the said third and fourth hammer means.