Material reducing hammer mill

Claim 2

A material reducing hammer mill comprising a hammer rotor, a casing enclosing said rotor and having a material outlet below said rotor, an elongated stack on said casing open to said rotor to direct incoming material into said rotor, breaker bars operatively mounted in said casing at opposite sides of said rotor, means pivoting said breaker bars from the upper ends thereof in said casing, control means operatively connected to said breaker bars below said upper ends, said control means positioning said breaker bars selectively inwardly about said rotor and accommodating movement of said breaker bars away from said rotor and including means cooperating with the breaker bars at one side of said rotor to space the breaker bars at said one side of said rotor in a position to direct objects projected upwardly in said elongated stack by said rotor to strike in said stack at an angle to the stack elongation, said stack being provided with a dome top section to redirect the projected objects back toward said rotor to impinge at said hammer rotor with substantial velocity to increase the efficiency of material reduction.

Claim 3

A material reducing hammer mill comprising a hammer rotor, a casing enclosing said rotor and having a material outlet below said rotor, an elongated stack on said casing open to said rotor to direct incoming material into said rotor, breaker bars operatively mounted in said casing at opposite sides of said rotor, means pivoting said breaker bars from the upper ends thereof in said casing, control means operatively connected to said breaker bars below said upper ends, said control means positioning said breaker bars selectively inwardly about said rotor and accommodating movement of said breaker bars away from said rotor and including means cooperating with the breaker bars at one side of said rotor to space the breaker bars at said one side of said rotor in a position to direct objects projected upwardly in said elongated stack by said rotor to strike in said stack at an angle to the stack elongation, said control means including pressure fluid means to absorb the shock of objects impinging on said breaker bars.

Claim 4

A material reducing hammer mill comprising a hammer rotor, a casing enclosing said rotor and having a material outlet below said rotor, an elongated stack on said casing open to said rotor to direct incoming material into said rotor, breaker bars operatively mounted in said casing at opposite sides of said rotor, means pivoting said breaker bars from the upper ends thereof in said casing, control means operatively connected to said breaker bars below said upper ends, said control means positioning said breaker bars selectively inwardly about said rotor and accommodating movement of said breaker bars away from said rotor and including means cooperating with the breaker bars at one side of said rotor to space the breaker bars at said one side of said rotor in a position to direct objects projected upwardly in said elongated stack by said rotor to strike in said stack at an angle to the stack elongation, said control means including pressure fluid means to absorb the shock of objects impinging on said breaker bars.

Claim 5

The mill of claim 2 wherein said means cooperating with said breaker bars at one side of said rotor to space the breaker bars at said one side in a position to direct objects projected upwardly in said elongated stack comprise a stack of shims.

Claim 6

A material reducing hammer mill comprising a casing having an inlet and an outlet, grate means at said outlet, a reversible rotor in said casing adjacent said grate means, hammers on said rotor describing a circular path and traveling across said grate means, breaker bars mounted adjacent said hammer path and at each side of said grate means, said breaker bars being movable about pivot axes remote from said grate bars, means adjustably operable to position the breaker bars selectively close to and spaced from said hammer path to accommodate the direction of rotation of said rotor and hammers, and a material feed stack connected at one end to said casing inlet and having a dome surface at its opposite end remote from said casing inlet, said breaker bar adjustably operable positioning means being adjusted to position the breaker bars at unequal spacing relative to said hammer path to make use of said breaker bars farthest from said hammer path to control the trajectory of hard to reduce material impelled by said rotor hammers past said grate means and reversely into said feed stack, said trajectory causing the material to strike glancingly in said feed stack and traverse said dome surface for return toward said casing inlet.

Claim 7

A material reducing hammer mill comprising a casing having an inlet and an outlet, grate means at said outlet, a reversible rotor in said casing adjacent said grate means, hammers on said rotor describing a circular path and traveling across said grate means, breaker bars mounted adjacent said hammer path and at each side of said grate means, said breaker bars being movable about pivot axes remote from said grate bars, means adjustably operable to position the breaker bars selectively close to and spaced from said hammer path to accommodate the direction of rotation of said rotor and hammers, and a material feed stack connected at one end to said casing inlet and having a dome surface at its opposite end remote from said casing inlet, said breaker bar adjustably operable positioning means being adjusted to position the breaker bars at unequal spacing relative to said hammer path to make use of said breaker bars farthest from said hammer path to control the trajectory of hard to reduce material impelled by said rotor hammers past said grate means and reversely into said feed stack, said trajectory causing the material to strike glancingly in said feed stack and traverse said dome surface for return toward said casing inlet.

Claim 8

The mill of claim 4 wherein said adjustably operable means includes pressure fluid cylinders connected to said breaker bars remote from said pivot axes, said cylinders normally urging said breaker bars toward said hammer path and yielding to the passage of hard to reduce material.

Claim 9

The mill of claim 4 wherein said adjustably operable means includes shim elements set to prevent movement of said breaker bars inwardly toward said hammer path beyond a predetermined position, and pressure fluid cyLinders connected to said breaker bars and normally acting to retain said breaker bars in positions determined by said shim means.

Claim 10

The mill of claim 4 wherein said material feed stack has a material receiving surface to direct material into said stack, and a protective curtain is positioned across said receiving surface to retain material in said stack.

Claim 11

The mill of claim 7 wherein said receiving surface is adjacent said dome surface to direct incoming material into the path of material impelled by said rotor hammers reversely into said stack.

Claim 12

A material reducing hammer mill comprising a hammer rotor reversibly rotatable, a casing enclosing said rotor, an elongated stack open to said casing above said rotor, breaker bars in said casing at opposite sides of said rotor, means pivoting said breaker bars from the upper ends for movement toward and away from said rotor, breaker bar position control means operatively connected to each of said breaker bars below said upper ends, each of said position control means including a slide block and pressure fluid thrust means connected to said breaker bar to move said breaker bar toward said rotor, and shim means cooperating with said slide blocks to limit the inward travel of said breaker bars, said shim means being more numerous at one side of said rotor to space the associated breaker bar farther from said rotor to direct objects propelled by said rotor upwardly in said elongated stack at an angle to the stack elongation.

Claim 13

A material reducing hammer mill comprising a hammer rotor reversibly rotatable, a casing enclosing said rotor, an elongated stack open to said casing above said rotor, breaker bars in said casing at opposite sides of said rotor, means pivoting said breaker bars from the upper ends for movement toward and away from said rotor, breaker bar position control means operatively connected to each of said breaker bars below said upper ends, each of said position control means including a slide block and pressure fluid thrust means connected to said breaker bar to move said breaker bar toward said rotor, and shim means cooperating with said slide blocks to limit the inward travel of said breaker bars, said shim means being more numerous at one side of said rotor to space the associated breaker bar farther from said rotor to direct objects propelled by said rotor upwardly in said elongated stack at an angle to the stack elongation.