Impact crusher

Abstract

An impeller assembly having a hard wear plate has replaceable impeller shoes and is rotated on a vertical axis to throw material against vertically reciprocated, replaceable breaker bars to crush the material. The breaker bars are reciprocated by power driven jacks. The material is supplied to the impeller through a spout having a dust-sealing valve. The impeller has a shaft journalled in a sealed impeller shaft housing mounted resiliently on a base, and the shaft is driven by a double universal joint drive. Lubricant is pumped from a sealed input shaft housing into the impeller shaft housing and back to the input shaft housing.

What is claimed is: 
     
       1. In an impact crusher: base means,   a rotary impeller mounted on the base means for rotation on a vertical axis,   drive means for rotating the impeller to centrifugally throw material to be crushed through a predetermined annular zone around the impeller,   annular breaker bar means,   mounting means mounting the breaker bar means .[.adjustably.]. .Iadd.movably .Iaddend.on the base means in positions surrounding said annular zone,   .Iadd.said breaker bar means presenting flat impact surfaces parallel to the vertical axis and normal to the path of thrown material to achieve maximum impact, .Iaddend.   and .[.adjustment.]. .Iadd.drive .Iaddend.means for moving the breaker bar means .Iadd.during rotation of the impeller and as the breaker bar means is being worn .Iaddend..[.relative to the base means.]..Iadd., said drive means including motor means for driving the breaker bar means, and control means automatically effecting reversal of the motor means at periodic intervals to cause reciprocation of the breaker bars so that the breaker bars are progressively moved .Iaddend.to vary the portion of the breaker bar means impacted by the thrown material to distribute wear .Iadd.evenly .Iaddend.over a large area of the breaker bar means .Iadd.so that the breaker bar means continues to present to thrown material impact surfaces that are substantially flat for maximum impact efficiency. .Iaddend.   
     
     
       2. The impact crusher of claim 1 wherein the .[.adjustment.]. .Iadd.drive .Iaddend.means moves the breaker bar means vertically relative to the impeller. .[.3. The impact crusher of claim 2 wherein the adjustment means 
     
     
        reciprocates the breaker bar means..]. 4. The impact crusher of claim .[.3.]. .Iadd.2 .Iaddend.wherein the .[.adjustment.]. .Iadd.drive .Iaddend.means comprises a plurality of expansible thrust mechanisms mounted in spaced positions around the impeller. a drive mechanism.   and drive coupling means connecting the drive mechanism to the thrust   
     
     
        mechanisms to drive the thrust mechanisms at the same rate of speed. 5. The impact crusher of claim 4 wherein each thrust mechanism comprises a 
     
     
        reversible jack screw. 6. The impact crusher of claim 5 .[.including reversing means, and.]. .Iadd.wherein said control means comprises .Iaddend.adjustable stopping means moving with and attached to the breaker 
     
     
        bar means. 7. The impact crusher of claim 2 wherein the mounting means includes vertical guide means mounted on the base means and guide rail 
     
     
        means on the breaker bar means guided by the guide means. 8. The impact crusher of claim 7 wherein the guide rail means comprises a plurality of guide rails spaced around the breaker bar means. the guide means including a plurality of pairs of rollers engaging opposite sides of the guide rails and a plurality of radial thrusting rollers   
     
     
        engaging the breaker bar means. 9. The impact crusher of claim 1 wherein the base means includes a vertical, cylindrical housing, the breaker bar .Iadd.means .Iaddend.having a cylindrical exterior and extending loosely into the cylindrical housing, .Iadd.said breaker bar means having a portion projecting from said housing, said drive means   
     
     
        being connected to said projecting portion. .Iaddend. 10. The impact crusher of claim 9 including .[.a flexible scraping ring mounted on.]. .Iadd.sealing means between .Iaddend.the lower end of the breaker bar means and .[.engaging the inner wall of.]. the cylindrical housing, .Iadd.and sealing means between the upper end of said breaker bar means and said housing. .Iaddend.  .[.11. The impact crusher of claim 9 including extensible sealing curtain means secured to the upper portion of 
     
     
        the breaker bar means and to the upper portion of the housing..]. 12. The impact crusher of claim 2 wherein the breaker bar means includes an outer, hollow cylinder, segmental breaker bars, and releasable fastening means securing the breaker bars to the inner surface of the hollow cylinder. 
     
     
            The impact crusher of claim 12 wherein the breaker bars and the hollow cylinder have lower interlocking dovetail portions, and the fastening means includes clamps bolted to the hollow cylinder and having dovetail portions interlocking with upper dovetail portions of the breaker bars. .[.14. The impact crusher of claim 12 wherein each breaker bar is pentagonally shaped to form an angular impact surface, the drive means being reversible..].  .[.15. In an impact crusher,  a base,    a rotary impeller,    means mounting the rotary impeller on the base for rotation about a vertical axis.    reversible drive means for selectively rotating the impeller in opposite directions,    non-rotating annular breaker bar means surrounding the impeller and having a first series of impact surfaces substantially normal to the path of material thrown by the impeller when the impeller is rotated in one direction and also having a second series of impact surfaces substantially normal to the path of material thrown by the impeller when the impeller is rotated in the opposite direction,    and means to elevate and lower said breaker bar means repetitiously within adjustable limits..].  .[.16. The impact crusher of claim 15 wherein the impact surfaces of the breaker bar means are arranged in angular   
     
     
        positions..]. 17. In an impact crusher, an impeller shaft,   an impeller mounted on the impeller shaft,   a vertical shaft housing,   bearing means in the housing journaling the shaft in the housing,   annular impact means surrounding the impeller,   drive shaft means for driving the impeller shaft,   flexible coupling means connecting the drive means to the impeller shaft,   a base,   means mounting the impact means on the base,   resilient means mounting the impeller shaft housing on the base,   
     
     
       and means mounting the drive means on the base. 18. The impact crusher of claim 17 wherein the flexible coupling means includes double universal 
     
     
        joint means. 19. The impact crusher of claim 17 wherein the shaft housing has an annular flange and the resilient means includes a pair of elastomeric discs on the shaft housing, an annular plate positioned between the discs and supported by the base, a washer-like plate bracketing the discs with the annular flange, and a nut threaded on the shaft housing to press the washer-like plate toward the annular flange to clamp the discs and the annular plate between the washer-like plate and 
     
     
        the annular flange. 20. The impact crusher of claim 17 including upper rotary sealing means between the upper ends of the housing and the shaft, lower rotary sealing means below the bearing means and between the shaft and the housing, a lubricant supply pipe fixed to the interior of the housing and having an outlet near the upper end of the housing, a lubricant drain pipe in the housing extending downwardly from a point above the lower seal means to a point below the lower seal means, a flexible supply conduit connected to the supply pipe, and a flexible drain 
     
     
        conduit connected to the drain pipe. 21. The impact crusher of claim 20 wherein the drive means includes drive shaft means connected to the flexible coupling means, a sealed drive shaft housing connected to the drain pipe, a pump driven by the drive means and having an outlet connected to the supply pipe and an inlet connected to the housing.