Conical crusher

• US 4,478,373 A
• Filed: 10/14/1980
• Issued: 10/23/1984
• Est. Priority Date: 10/14/1980
• Status: Expired due to Term

• Current Assignee: Nordberg Inc (Metso Corporation)
• Original Assignee: Rexnord Corporation
• Inventors: Gieschen, John A.
• Primary Examiner(s): Goldberg, Howard N.
• Assistant Examiner(s): Eley, Timothy V.
• Application Number:
  US06/196,509
• Time in Patent Office: 1,470 Days
• Field of Search: 241/290, 241/286, 241/285 R, 241/207-216
• US Class Current: 241/208
• CPC Class Codes: B02C 2/045 and with bowl adjusting or controlling mechanisms B02C2/042, B02C2/06 take precedence

Abstract

A crusher of the conical type has a spherical bearing arrangement for supporting the head assembly on a stationary shaft. Included are tramp release means for automatically opening the crusher throat when tramp material is encountered and for jacking open the throat under nonoperating conditions.

Claims

1. An apparatus for crushing materials, comprising:

(a) a frame structure including a hub member having a vertical bore;

(b) a stationary support member having a central longitudinal axis, and having an upper portion and a lower portion, said lower portion being positioned within said bore and secured to said hub;

(c) a cylindrical eccentric mounted around said stationary support member for eccentric rotation therearound, said eccentric having an axis which intersects said longitudinal axis;

(d) means for rotating said eccentric about said support member;

(e) a head assembly having a cylindrical eccentric follower mounted on said eccentric for eccentric rotational movement about said support member, and including a lower crusher surface, and an upper spherical bearing member fixed to the underside of said head assembly;

(f) a bowl assembly mounted for adjustable movement relative to said frame, said bowl assembly having an upper crusher surface spaced an adjustable predetermined distance from said lower surface under static conditions; and

(g) a spherical bearing seat supported by rigidly fixed to said upper portion of said support member, and holding and supporting said upper spherical bearing member, said spherical bearing seat having a center of curvature which substantially coincides with said intersection of said eccentric axis and said longitudinal axis.

2. The apparatus of claim 1, further comprising a plurality of release means for maintaining said predetermined distance of said upper crusher surface from said lower surface under normal loaded conditions, for allowing said upper crusher surface to move upward under abnormal conditions, and for forcibly lifting said bowl assembly upwardly away from said head assembly for clearing.

3. The apparatus of claim 2 in which said release means comprise a plurality of double acting hydraulic assemblies, each including a piston axially movable in an enclosing cylinder, one end of each assembly is mechanically coupled to said upper crusher surface, and the other end is mechanically coupled to said frame;

said release means allowing upward movement of said upper crusher surface in response to external pressures above a predetermined level caused by the encounter of tramp material between said upper and lower crusher surfaces, said release means returning said upper crusher surface to its initial position when the external pressures decrease to the predetemined level.

4. The apparatus of claim 3, further comprising a pluraity of radially extending arms having outer ends and having inner ends connected to said hub, said other ends of said hydrualic assemblies being connected, one each, to the outer ends of said arms.

5. The apparatus of claim 1, further comprising lubrication passages in said support member and said eccentric communicating directly between a source of pressurized lubricant and a bearing interface between said bearing seat and said upper spherical bearing member and to bearing interfaces between said eccentric and said support member and said head assembly for supplying lubricant to said bearing interfaces.

6. The apparatus of claim 1, further comprising bowl position adjusting means mounted on said frame for adjusting the vertical position of said bowl relative to said stationary support member, and thereby adjusting the static distance between said upper and lower crushing surfaces.

7. The apparatus of claim 6 wherein said bowl position adjustment means includes a ram having a cylinder and a piston axially movable within said cylinder, said ram being mounted on said frame with the axis of said ram oriented at a secant to said bowl, and means on said ram for selectively pushing against said bowl to rotate said bowl on the extend stroke of said ram, and for pulling on said bowl to rotate said bowl in the other direction on the retract stroke of said ram.

8. A crusher of the conical type having a stationary lower frame assembly, a vertically movable upper frame assembly biased toward said lower frame assembly, a head assembly including a crusher head mounted on a support means for gyratory motion relative to said frame assemblies, an adjustable bowl mounted to said upper frame assembly for vertical movement relative to said frame assemblies and head assembly, and eccentric means for imparting gyratory motion to said head, and a drive means for driving said eccentric means, said crusher characterized by release means including biasing means and lifting means connected to said lower and upper frames for releasably biasing said upper frame into an abutting relationship with said lower frame and responsive to a first signal for deactivating said biasing means and activating said lifting means for lifting said upper frame away from said lower frame to permit the clearing of jammed material, and responsive to a second signal for activating said biasing means and deactivating said lifting means;

said release means comprising a plurality of double acting hydraulic cylinders and pistons, said cylinders connected to one of said frame assemblies and said pistons connected to the other of said frame assemblies, one end of said cylinders being pressurized in a normally operating crushing mode to exert a hydraulic biasing force to hold said frame assemblies together in abutting relationship, and further including at least one normally pressurized accumulator in fluid communication with said one end of one of said cylinders to receive fluid displaced from said one cylinder when tramp material passes through the crushing cavity between said head and said bowl.

9. The crusher of claim 8 in which said piston is connected directly to the upper frame assembly and is biased downwardly by hydraulic pressure within said cylinder above said piston.

10. The crusher of claim 8 in which said one end of said cylinder communicates with said accumulator and, through a selectively movable valve, selectively with a hydraulic fluid reservoir and a hydraulic pressure source to vent said one end in a clearing mode for vertical separation of said frame assemblies, and to pressurize said one end in a normal crushing mode to bias said frame assemblies into abutting relationship, and the other end of said cylinder is selectively connected through said valve to said hydraulic pressure source in said clearing mode to lift said upper frame assembly away from said lower frame assembly, and to said reservoir in said normal crushing mode.

11. The crusher of claim 10 in which said valve means comprises a 4-way , 3-position valve for selectively connecting the two ends of said cylinder with said source of hydraulic fluid pressure and said reservoir.

12. The crusher of claim 8, wherein said lower frame assembly further comprises a central hub and a plurality of arms having inner and outer ends, said arms attached at their inner ends to, and extending radially from, said hub, said arms bifurcating at their outer ends and having means on the bifurcated outer ends for attachment thereto of one end of said release means.

13. The crusher of claim 8, wherein said lower frame assembly includes an annular shell having an upper portion which terminates in a ring seat having a beveled upper surface;

said upper frame assembly includes a ring having a beveled lower surface corresponding to said ring seat upper beveled surface, said biasing means normally holding said ring against said seat with said beveled surfaces in contact with each other.

14. A crusher frame, comprising:

(a) a hub member having a vertical bore for receiving a stationary crusher apparatus support member and an annular, substantially horizontal surface about said bore for rotatably supporting an eccentric;

(b) a horizontally positioned base flange;

(c) a plurality of arms integral with and extending radially outwardly from said hub, each of said arms bifurcating into a pair of diverging vertical flanges secured to said base flange;

(d) an annular shell fabricated from sheet steel and positioned in a welded, abutting relationship to said base flange between said arms and to said extension of said arms;

(e) an annular ring yieldably secured along its lower periphery in an abutting relationship to the upper periphery of said annular shell;

(f) an annular member movable attached to the internal surface of said annular ring for vertical movement relative to said annular ring; and

(g) yielding means fixedly secured to each of said vertical flanges and yieldably secured to said annular ring for biasing said annular ring to said annular shell.

15. A crusher frame in accordance with claim 14 in which the lower periphery of said annular ring and the upper periphery of said annular shell have complimentary sloped abutting surfaces.

16. A crusher frame in accordance with claim 14 in which said hub member has an integral extension intermediate the upper and lower ends of said hub member which integral extension, with said hub member, forms part of an enclosure configured to receive a gear secured to said eccentric.

17. A crusher of the conical type having a stationary lower frame assembly, a vertically movable upper frame assembly biased toward said lower frame assembly, a head assembly including a crusher head mounted on a support means for gyratory motion relative to said frame assemblies, an adjustable bowl having an annular surface with spaced abutments and mounted to said upper frame assembly for vertical movement relative to said frame assemblies and head assembly by virtue of interfacing, helically threaded surfaces of said upper frame and bowl, an eccentric for imparting gyratory motion to said head, and a drive means for driving said eccentric, said crusher characterized by having a bowl adjusting double acting ram assembly mounted on one of said frame assemblies, said ram assembly having a cylinder and, within said cylinder, an axially reciprocating piston, said cylinder having fluid connectors for delivering pressurized fluid selectively to either side of said piston, a fork connected to said piston having two engaging surfaces for selective engagement with opposite sides of said abutments, said fork having first and second positions in which said ram assembly rotates said bowl in one direction on the extension stroke of said piston when said fork is in said first position, and in the other direction on the retraction stroke of said piston when said fork is in said second position, thereby imparting vertical movement to said bowl.

18. The crusher of claim 17 in which one of said fork engaging surfaces in said first position contacts one side of said spaced abutments during said extension stroke of said piston, and the other of said fork engaging surfaces in said second position contacts the other side of said spaced abutments during said retraction stroke of said piston.

19. An apparatus for crushing materials, comprising:

(a) a frame structure including a base, an annular shell supported by said base, a central hub with a central bore, and a plurality of arms integral with and extending radially out from said hub and terminating at said base, said annular shell having an upper portion which terminates in a ring seat;

(b) an annular ring mounted for vertical movement and biased downwardly against said ring seat, said annular ring being helically threaded along the internal surface thereof;

(c) a bowl assembly including an annular substantially vertical flange helically threaded along the external surface and meshing with the internally threaded surface of said annular ring, and an upper crusher surface secured to said flange;

(d) a head assembly including a lower crusher surface spaced an adjustable predetermined static distance from said upper crusher surface;

(e) bowl assembly adjusting means mounted on said ring for rotating said bowl assembly to adjust the static distance from said upper and lower surfaces;

(f) a stationary support shaft having a top portion, and also having a bottom portion rigidly maintained within the central bore of said hub;

(g) head assembly support means for vertically and horizontally supporting said head assembly on said shaft, and including an upper spherical bearing surface secured to said head assembly, and a lower spherical bearing surface secured to said support shaft top portion and supporting said upper bearing surface;

(h) an eccentric means mounted for rotational movement about said stationary shaft for imparting gyratory motion to said lower crusher surface, said eccentric means supported axially by said central hub;

(i) drive means for rotating said eccentric means; and

(j) a plurality of release means each supported by said base and connected to said annular ring for biasing said annular ring against said ring seat under normal operating conditions and for permitting upward vertical displacement of said annular ring when said upper and lower crusher surfaces encounter tramp material, said release means additionally being operative to positively displace said annular ring upward under static conditions for clearing the space between said upper and lower crusher surfaces.

20. The apparatus of claim 19 in which the radial arms have an annular vertical flange which provides a weld seat for said annular shell.

21. The apparatus of claim 19 in which said release means comprises a plurality of double acting hydraulic cylinders and pistons secured between said adjusting ring and said paired vertical flanges, and an accumulator tank communicating with said cylinder, said pistons normally maintained in a first position by hydraulic fluid in said cylinder.

22. The apparatus of claim 21, further comprising a hydraulic pressure source for normally maintaining the hydraulic fluid within said cylinder under a predetermined pressure, said release means further including means responsive to momentary pressure levels above the predetermined level for moving the fluid into the accumulator tank thereby permitting said piston to be displaced by said adjusting ring lifting off of said ring seat and for returning said fluid when momentary pressure levels return to the predetermined level to return said adjusting ring to said ring seat.

23. The apparatus of claim 21 in which said release means further includes a fluidic system means responsive to a signal for displacing said piston to a second position in which said adjusting ring and said bowl assembly are displaced vertically upward.

24. The apparatus of claim 19 in which said ring seat has a wedge cross-section, the upper-outer surface of which provides an abutment for the normally downwardly biased adjustment ring.

25. The apparatus of claim 19 further including bearing surfaces located between said eccentric and stationary support shaft, between said head assembly and said eccentric, and between said hub and said eccentric, and lubrication passages extending through said shaft directly to said bearing surfaces between said eccentric and said head assembly, and between said eccentric and said shaft, and also directly to said upper and lower bearing surfaces.

26. The apparatus of claim 19 in which the bowl assembly adjusting means comprises double acting ram assembly including a hydraulic cylinder and an axially movable piston therein, said piston has connected to the outer end thereof a bowl engaging means for rotating said bowl selective distances both clockwise and counter-clockwise.

27. The apparatus of claim 26 in which the bowl assembly has an annular flange with spaced abutments extending along the outer surface thereof, said bowl engaging means being a forked extension capable of abutting either side of said abutments wherein a first position said forked extension is oriented such that an engaged abutment is pushed away from said ram assembly when said piston is extended in said cylinder in response to a first actuating signal and in a second position is oriented such that an engaged abutment is pulled toward said ram assembly when said piston is retracted in said cylinder in response to a second actuating signal.