Method for securing a gyratory crusher mantle

• US 6,604,699 B1
• Filed: 08/10/2001
• Issued: 08/12/2003
• Est. Priority Date: 06/01/1999
• Status: Expired due to Term

• Current Assignee: Metso Minerals Industries Incorporated (Neles Oyj)
• Original Assignee: Metso Minerals Industries Incorporated (Neles Oyj)
• Inventors: Polinski, Donald J., Vogltanz, Thomas E.
• Primary Examiner(s): Hong, William
• Application Number:
  US09/928,123
• Time in Patent Office: 732 Days
• Field of Search: 241/207, 241/209, 241/215, 241/24.31, 241/30
• US Class Current: 241/30
• CPC Class Codes: B02C 2/06 and with top bearing B02C2/042 takes precedence

Abstract

The head nut assembly for gyratory crusher which includes a shaft having a lower portion, a tapered middle portion and a threaded upper portion. The threaded upper portion extends above the tapered portion. A mantle encompasses the middle tapered portion and has a correspondingly tapered internal side. The internal side is in generally continuous supportive engagement with the shaft middle portion. The mantle additionally has an upper side. A head nut is threadably secured to the upper portion of the shaft. The head nut has a lower face, where at least one bore extends upwardly into the lower face. An annular ring is disposed around the shaft between the mantle and the head nut. The ring has a lower surface coupled with the upper side of the mantle so as to prevent relative rotational movement between the mantle and the ring. An upper surface on the ring is contiguous with the lower face of the head nut. At least one key is disposed between the head nut and the annular ring. The key is completely captured inside the head nut bore and acts to couple the ring to the head nut and prevent relative rotational movement between the ring and the head nut.

Claims

1. A method for securing a mantle having a tapered internal side and an upper side, to a shaft having a lower portion, a middle portion correspondingly tapered to be in generally contiguous supportive engagement with the mantle internal side and a threaded upper portion of the shaft extending above the mantle, comprising:

disposing an annular ring around the shaft above the mantle;

threading a head nut to the upper portion of the shaft above the annular ring; and

securing the head nut to the ring using a key totally captured inside the head nut and the annular ring.

2. The method of claim 1, further comprising:

welding the annular ring to the mantle.

3. The method of claim 1 wherein the head nut includes:

a lower face; and

a bore extending upwardly into the lower face.

4. The method of claim 1 wherein the annular ring includes:

a top face;

a bottom face; and

an aperture extending downwardly into the top face, through the annular ring, emerging from the bottom face, wherein a remaining portion of the key is captured inside the aperture.

5. The method of claim 4 wherein the key is welded into the aperture.

6. The method of claim 1 wherein the key is in the shape of a dowel.

7. A method for replacing a worn mantle disposed about a main shaft in a gyratory crusher comprising:

cutting through a used burning ring disposed annularly around the main shaft,

unthreading a head nut disposed annularly about the main shaft and above the burning ring;

removing the worn mantle;

positioning a new mantle around the main shaft, wherein the mantle includes an upper side;

disposing a burning ring about the main shaft above the mantle including a lower surface and an upper surface, wherein an aperture extends perpendicularly into the upper surface, through the burning ring, and out the lower surface and a key is fixed into the aperture extending above the upper surface;

re-threading the head nut onto the main shaft above the burning ring, the head nut having a lower face and a bore extending perpendicularly into the lower face;

securing the burning ring to the head nut by positioning the portion of the key extending above the upper surface into the bore in the head nut; and

fixing the burning ring to the mantle.