System and method for installing hammers
Improved free-swinging hammermill hammer configurations are disclosed and described for comminution of materials such as grain and refuse. The hammer configurations of the present disclosure are adaptable to most hammer mill or grinders having free-swinging systems. The configurations as disclosed and claimed are non-forged and incorporate a saddle or hammer mouth. The merging of a hammer and saddle improves strength to reduce or maintain the weight of the hammer while increasing the amount of force delivered to the material to be comminuted. The improved configurations incorporate comminution edges having increased hardness for longer operational run times. The improved configurations improve installing, removing, and cleaning hammer components within the hammermill. The improved configurations may incorporate hammermill rod hole of varying shapes and sizes and saddles of varying shapes and sizes or the use of non-planar hammer bodies that have a recessed or protruding surface.
1. A hammer for use in a rotatable hammermill assembly comprising:
a hammer body comprising:
a hammer body front surface;
a hammer body rear surface opposite the hammer body front surface;
a first end; and
a second end for contact and delivery of momentum to material to be comminuted, wherein said second end has a weld hardened edge;
a front plate secured to the hammer body front surface at the first end, including a front plate thickness, and not being integrally formed with the hammer body front surface;
a rear plate secured to the hammer body rear surface at the first end, including a rear plate thickness different from the front plate thickness, and not being integrally formed with the hammer body front surface;
a rod hole passing through the hammer body, the front plate, and the rear plate.
2. The hammer of claim 1 wherein the front plate and the rear plate have a substantially circular perimeter.
3. The hammer of claim 1 wherein the hammer body, the front plate, and the rear plate are secured to one another via a tungsten carbide weld.
4. The hammer of claim 1 wherein the hammer body further comprises a hammer body bottom surface flush with a front plate bottom surface of the front plate and a rear plate bottom surface of the rear plate.
5. The hammer of claim 1 wherein the rod hole is substantially circular.
6. The hammer of claim 1 wherein the rod hole is centered in the first end of the hammer body.
7. The hammer of claim 1 wherein the weld hardened edge is welded to the periphery of the second end and comprises:
two side contact edges opposite one another that partially cover the first and second hammer body edges;
a top contact edge; and
tungsten carbide for increased hardness.
8. The hammer of claim 7 wherein the two side contact edges are stepped.
9. The hammer of claim 7 wherein the hammer body is symmetrical across the hammer body front surface such that either of the side contact edges may be the leading edge during operation of the rotatable hammermill assembly.
10. The hammer of claim 1 further comprising hammer body holes within the hammer body.
11. A rotatable hammermill comprising:
a hammermill rod; and
at least two hammers according to claim 1 , the hammers arranged in a row along the hammermill rod;
wherein the hammermill has no spacers between the hammers.
12. The rotatable hammermill of claim 11 wherein the at least two hammers are arranged in a pattern optimized for comminuting material.
13. The rotatable hammermill of claim 12 wherein the hammermill includes a plurality of hammermill rods, the pattern being repeated at least once on at least two hammermill rods.
14. The rotatable hammermill of claim 13 wherein the hammermill includes at least six hammermill rods and at most three distinct patterns of arranging the hammers along a single hammermill rod.
15. The rotatable hammermill of claim 12 wherein the hammermill includes a plurality of hammermill rods, the at least two hammers of each hammermill rod arranged in a distinct pattern.
16. A method of manufacturing the hammer according to claim 1 comprising casting the hammer body with molten iron or molten steel.
17. The method of claim 16 further comprising hardfacing tungsten carbide onto the periphery of the second end.
18. The method of claim 16 further comprising heat treating the hammer body for increased hardness.
19. A method of installing the hammer according to claim 1 on a hammermill rod of a hammermill.