Cone crusher having positive head hold-down mechanism

• US 5,996,916 A
• Filed: 10/17/1997
• Issued: 12/07/1999
• Est. Priority Date: 10/15/1996
• Status: Expired due to Fees

• Current Assignee: Terex Usa, LLC (Terex Corporation)
• Original Assignee: Cedarapids Incorporated (Terex Corporation)
• Inventors: Musil, Joseph E.
• Primary Examiner(s): Rosenbaum, Mark
• Application Number:
  US08/997,054
• Time in Patent Office: 781 Days
• Field of Search: 241/207-216
• US Class Current: 241/215
• CPC Class Codes: B02C 2/047 and with head adjusting or controlling mechanisms B02C2/042, B02C2/06 take precedence

Abstract

A gyratory crusher having a positive head hold-down mechanism. The crusher includes a frame structure; a first mounting arrangement including a pair of taper bearings for rotatably mounting an eccentric member to the frame structure about a vertically oriented first axis; a second mounting arrangement including a spherical bearing for spiderlessly and rotatably mounting a main shaft to the eccentric member about a substantially vertically oriented second axis angularly offset from the first axis; a crusher head mounted on said main shaft; drive means including a bevel gear secured to the eccentric member and a drive pinion arrangement for rotating said eccentric member about the first axis; a hold-down mechanism fixedly mounted to the crusher head for preventing vertical displacement of the crusher head relative to the a plurality of hydrostatic bearings operably supporting the crusher head; and seal means for protecting moving components of the crusher.

Claims

1. A gyratory crusher for crushing material, comprising:

(a) a frame structure;

(b) an eccentric member having a first mounting arrangement configured to rotatably mount said eccentric member to said frame structure about a vertically oriented first axis;

(c) a main shaft having a second mounting arrangement configured to spiderlessly and rotatably mount said main shaft to said eccentric member about a substantially vertically oriented second axis angularly offset from said first axis;

(d) a crusher head mounted to said main shaft about said second axis;

(e) drive means for rotating said eccentric member about said first axis; and

(f) hold-down means for operably preventing vertical displacement of said crusher head relative to said eccentric member.

2. The gyratory crusher according to claim 1, wherein said first mounting arrangement includes a pair of taper bearings.

3. The gyratory crusher according to claim 1, wherein said second mounting arrangement includes a spherical bearing.

4. The gyratory crusher according to claim 1, wherein said drive means includes a bevel gear centered about said first axis and secured to said eccentric member and a drive pinion arrangement enmeshed with said bevel gear.

5. The gyratory crusher according to claim 1, including:

(a) said frame structure having a lower portion; and

(b) a plurality of hydrostatic bearings mounted on said lower portion and configured to operably abuttingly engage said crusher head.

6. The gyratory crusher according to claim 5, wherein said hold-down means is also configured to prevent said crusher head from operably levitating from said abutting engagement with said plurality of hydrostatic bearings.

7. The gyratory crusher according to claim 5, wherein said plurality of hydrostatic bearings are mounted such that said eccentric member is prevented from vertical displacement relative to said lower portion.

8. The gyratory crusher according to claim 5, including seal means for operably protecting said first and second mounting arrangements and said plurality of hydrostatic bearings.

9. The gyratory crusher according to claim 8, wherein said seal means includes:

(a) a seal bearing having

(1) an inner race connected to said lower portion,

(2) an outer race, and

(3) bearing balls captured between said inner and outer races; and

(b) a flexible member connected between said crusher head and said outer race.

10. The gyratory crusher according to claim 1, wherein said hold-down means includes:

(a) a retaining cup extending beneath said second mounting arrangement and said main shaft; and

(b) securing means for securing said retaining cup to said main shaft.

11. The gyratory crusher according to claim 10, wherein said securing means is rotationally fixed relative to said crusher head.

12. The gyratory crusher according to claim 10, wherein said securing means includes:

(a) said retaining cup having a centrally situated orifice;

(b) said main shaft having an axially situated throughbore;

(c) a draw rod having a threaded distal end; and

(d) a tapped sleeve mounted in said orifice and configured to threadably receive said threaded distal end as said draw rod extends through said axially situated throughbore of said main shaft.

13. The gyratory crusher according to claim 12, wherein said draw rod has a rod head that is accessible through an upper end of said throughbore.

14. The gyratory crusher according to claim 13, wherein said securing means also includes:

(a) said throughbore having a shoulder; and

(b) Belleville-type washers mounted between said rod head and said shoulder.

15. The gyratory crusher according to claim 13, including a depression in said rod head configured to matingly receive an Allen wrench.

16. The gyratory crusher according to claim 12, including:

(a) a fitting mounted to said sleeve such that axial and rotational displacement of said sleeve relative to said fitting is prevented.

17. The gyratory crusher according to claim 12, including a thrust bearing configured to rotationally mount said tapped sleeve to said retaining cup about said second axis.

18. The gyratory crusher according to claim 12, including a capture mechanism configured to operably prevent rotational displacement of said draw rod relative to said main shaft.

19. The gyratory crusher according to claim 12, including a stop mechanism configured to provide a reference for repositioning of said draw rod relative to said tapped sleeve.

20. A gyratory crusher for crushing material, comprising:

(a) a lower frame;

(b) an upper frame supported by the lower frame and having a bonnet secured thereto, the bonnet having an upper opening for receiving the material;

(c) an eccentric member rotatably mounted to the lower frame;

(d) a crusher head having a main shaft rotatably mounted to the eccentric member, the crusher head and the bonnet forming a crushing chamber therebetween, the main shaft having an upper end and a lower end;

(e) a drive motor for rotating the eccentric member; and

(f) a hold down assembly coupled to the lower end of the main shaft arid engaging the eccentric member, the hold down assembly being adapted to limit axial movement of the main shaft relative to the eccentric member.

21. The crusher of claim 20, wherein the crusher head main shaft includes a bore extending axially therethrough, the hold down assembly including a retaining member and a draw rod, the retaining member operatively engaging the eccentric member, the draw rod being disposed through the bore and engaging the retaining member.

22. The crusher of claim 21, wherein the draw rod includes an upper end having a bolt head secured adjacent the main shaft upper end by a resilient washer.

23. The crusher of claim 21, wherein the bore includes a lower end having a counterbore, and wherein a portion of the hold down assembly is received within the counterbore.

24. The crusher of claim 23, wherein the counterbore and the hold down assembly portion are conically shaped.

25. The crusher of claim 20, wherein the hold down assembly includes a retaining cup and a sleeve engaging the retaining cup, the retaining cup engaging the eccentric member, the sleeve being rotatable relative to the retaining cup.

26. The crusher of claim 24, wherein the sleeve is mounted to the retaining cup by thrust bearings.

27. The crusher of claim 25, wherein the sleeve includes a detent, and wherein the main shaft includes a bore extending axially therethrough and a draw rod disposed through the bore and engaging the shaft and the retaining cup, and further wherein the main shaft lower end includes a retractable member positioned to engage the detent to thereby prevent rotation of the draw rod and the sleeve relative to the main shaft.

28. The crusher of claim 27, wherein the retractable member is spring loaded and retracts along a path generally perpendicular to the axis of the main shaft.

29. The crusher of claim 27, wherein the retractable member is removably secured to the main shaft lower end by bolts.

30. The crusher of claim 25, wherein the main shaft includes a bore extending axially therethrough and a draw rod disposed through the bore and engaging the shaft and the retaining cup, a portion of the draw rod being threaded, and further wherein the sleeve includes a threaded bore sized to receive the draw rod threaded portion, and further including a lock nut engaging the draw rod threaded portion for preventing rotation of the sleeve relative to the draw rod.

31. The crusher of claim 30, wherein the draw rod includes adjustment indicia imprinted thereon.

32. The crusher of claim 20, wherein the hold down member includes a tapped sleeve, and the draw rod includes a threaded lower end engaging the tapped sleeve, and a lock nut for locking the relative rotational position of the draw rod and to the tapped sleeve.

33. A gyratory crusher for crushing material, comprising:

(a) a frame;

(b) a bonnet;

(c) a gyrating crusher head having a main shaft supported by the frame for relative gyrational movement, the crusher head and the bonnet forming a crushing chamber therebetween, the main shaft having an upper end and a lower end;

(d) a drive motor for gyrating the crusher head; and

(e) a hold down mechanism operatively connecting the lower end of the main shaft to the frame to prevent axial movement of the main shaft relative to the frame.

34. The crusher of claim 33, wherein the main shaft includes a bore extending axially therethrough, the hold down mechanism including a draw rod disposed through the bore and further including a retaining cup operatively engaging the frame, a portion of the draw rod engaging the retaining cup.

35. The crusher of claim 34, wherein the bore includes a lower end having a counterbore, and wherein the hold down mechanism includes a sleeve received within the counterbore.

36. The crusher of claim 35, wherein the sleeve includes a detent, and the main shaft lower end includes a retractable member positioned to engage the detent to thereby prevent rotation of the draw rod and the sleeve relative to the main shaft.

39. The crusher of claim 35, wherein the counterbore and the sleeve are conically shaped.

40. The crusher of claim 34, including a sleeve member rotatably mounted to the retaining cup and engaging the draw rod.

41. The crusher of claim 40, wherein the sleeve member is mounted to the retaining cup by thrust bearings.

42. The crusher of claim 34, wherein the hold down mechanism includes a tapped sleeve and the draw rod lower end includes a threaded portion engaging the tapped sleeve, the tapped sleeve being rotationally mounted to the retaining cup by thrust bearings.

43. The crusher of claim 34, wherein the draw rod includes an upper end, the draw rod upper end being secured to the main shaft by a resilient member.

44. The crusher of claim 33, wherein the main shaft is mounted to an eccentric member, the eccentric member being rotatably mounted to the frame.

45. The crusher of claim 33, wherein the hold down mechanism resiliently engages an upper portion of the main shaft.

37. The crusher of claim 37, wherein the retractable member is spring loaded and retracts along a path generally perpendicular to the axis of the main shaft.

38. The crusher of claim 37, wherein the retractable member is removably secured to the main shaft lower end by bolts.

46. A device for preventing levitation of a crusher head on a gyratory crusher, the gyratory crusher having a frame, a bonnet, and a main shaft supporting the crusher head, a lower end of the main shaft being received in an eccentric member, the device comprising:

a bore extending axially through the main shaft and having a lower end;

a draw rod secured to the crusher head and having a lower end extending to the main shaft lower end;

a sleeve engaging the draw rod lower end; and

a retaining member engaging the sleeve and being operatively connected to the eccentric member;

whereby the draw rod, the sleeve, and the retaining member cooperate to prevent undesired vertical movement of the main shaft relative to the frame.

47. A gyratory crusher comprising a frame, a bonnet, a gyrating crusher head supported on a main shaft, and a hold down assembly engaging the main shaft from a lower end thereof to prevent undesired vertical movement of the crusher head relative to the frame and further to permit rotational movement of the crusher head relative to the frame.