US3924815A

US3924815A - Gyratory crusher

Info

Publication number: US3924815A
Application number: US442585A
Authority: US
Inventors: Erik Haggren
Original assignee: Morgardshammar AB
Current assignee: Morgardshammar AB
Priority date: 1973-02-19
Filing date: 1974-02-14
Publication date: 1975-12-09
Anticipated expiration: 1992-12-09
Also published as: FR2218140B1; DE2406229A1; FR2218140A1; AU6559674A

Abstract

A gyratory crusher comprises a crusher shaft which performs eccentric or epicyclic movements. A crusher member is clamped on the crusher shaft by a stop nut. The stop nut is attached to a vertically split sleeve, the inner surface of the sleeve having substantially the shape of a truncated double-cone with a cross section diminishing from the ends thereof. The sleeve is attached to a portion of the crusher shaft having a corresponding doublecone shape. The sleeve has external threads for receiving the stop nut. A plurality of screws are threadedly engaged in the stop nut and are tightened against a horizontal surface of the upper end of the crusher member. The screws are upset by an axial force applied thereto by the crusher member so as to protect the stop nut, sleeve or crusher shaft from damage due to such force.

Description

United States Patent 1191 Haggren Dec. 9, 1975 [5 GYRATORY CRUSHER 3,539,119 11/1970 Cook 241/215 [75] Inventor: Erik Haggren, Morgardshammar,

Sweden Primary ExaminerGranv1lle Y. Custer, Jr. Assistant ExaminerHoWard N. Goldberg [73] Ass1gnee: Morgardshammar AB, Stockholm,

Swede 57 ABSTRACT [22] Flled: 1974 A gyratory crusher comprises a crusher shaft which [21] Appl. No.: 442,585 performs eccentric or epicyclic movements. A crusher member is clamped on the crusher shaft by a stop nut. The stop nut is attached to a vertically split sleeve, the [30] Forelgn Apphcatlon Pnonty Data inner surface of the sleeve having substantially the Feb. 19, 1973 Sweden 7302292 hape of a truncated doub]e-c ne a ross Section diminishing from the ends thereof. The sleeve is at- U-S- R tached to a portion of the rusher shaft having a or- Il-lt. Clresponding double cone rhe leeve has exter- Fleld of Search nal threads for receiving the Stop nut A of 241/285 R screws are threadedly engaged in the stop nut and are tightened against a horizontal surface of the upper end [56] References cued of the crusher member. The screws are upset by an UNTTED STATES PATENTS axial force applied thereto by the crusher member so 1,533,658 4/1925 Newhouse 241/215 as to Protect the p nut, sleeve of Crusher Shaft from 2,484,971 10/1949 Traylor, Jr. 241/216 damage due to Such force. 3,417,932 12/1968 Patterson 241/216 X Cl 2Dr 3,534,916 10/1970 Decker et al. 241/285 R awmg guns I 7 i I I 7m 2'- Z I US. Patent Dec/9, 1975 Sheet20f 2 3,924,815

FIG. 2

GYRATORY CRUSHER This invention relates to a gyratory crusher of the kind comprising a vertical crusher shaft provided with a crusher member, which shaft is arranged in a known manner so as to carry out eccentric or epicyclic rotary movement in a vertical crusher space, and which crusher member is clamped. on the crusher shaft by means of a stop nut threaded on the crusher shaft or a sleeve on the crusher shaft.

In such crushers, the crusher member generally has an inwardly conical shape which is guided on the conical crusher shaft or on conical sleeves mounted on the conical crusher shaft.

When the crusher is operating, the material being crushed subjects the crusher member to a certain rolling action, which creates a tendency for the crusher member to move axially and thereby upsets the threads of the stop nut and shaft. This can render the stop nut difficult to turn, and can thus render untightening of the nut extremely difficult if such untightening is required. If the corresponding thread of the shaft is damaged, considerable difficulties will be encountered with respect to the repair of such damage.

These disadvantages are avoided by means of a gyratory crusher according to the invention, in which crusher the stop nut is attached on a vertically split sleeve, the inner surface of which substantially has the shape of a truncated double-cone with a cross section diminishing from the ends, and which sleeve is mounted on a crusher shaft portion having a corresponding double-cone shape. The split sleeve has external threads on which the stop nut is threaded.

According to the invention, the stop nut advantageously is provided with vertical screws adapted to be tightened against a horizontal upper surface of the crusher member. This facilitates application of the stopnut since it is considerably easier to tighten the screws than to tighten the stop nut, which usually is very large, and further this structure eliminates the need for corresponding threads on the crusher shaft and thereby eliminates the potential of damage to the shaft thread and the attendant repair difficulties which such damage would present.

According to the invention, the screws are tightened in such a manner that a substantial space exists between the lower surface of the stop nut and the surface of the crusher member that the screws engage, so that when required the stop nut can be untightened easily after the screws are cut off beneath the stop nut, for example, by means of a cutting torch.

Further, the screws advantageously have such a cross-sectional area and are such in number that the screws are upset when an axial force arises which is so strong, that it would be detrimental to the remaining parts, such as the stop nut, sleeve or crusher shaft. Accordingly, the risk of damage on said parts is thereby substantially eliminated.

The invention is described in greater detail in the following description made with reference to the accompanying drawings showing by way of example an embodiment of the invention, and in which:

FIG. 1 is lateral latgeral view of a gyratory crusher according to the invention; and

FIG. 2 illustrates partially and on a larger scale the crusher shaft stop nut, indicated by P in FIG. 1, and the sleeve.

As noted above, the present invention relates to a gyratory crusher which includes a crusher shaft 1 and a crusher member 2, the upper portion of which is shown in FIG. 2. The crusher shaft 1 and the crusher member 2, which is mounted thereupon in a manner to be described hereinafter, are mounted for movement in a vertical crushing space 3. The crusher member 2 forms a crushing surface against which material is impacted during the crushing process. The mechanism for gyrating the crusher shaft and crusher member may be of conventional construction for known gyrating crushers. A vertically split sleeve 4 is provided for guiding the crusher member upper portion on the crusher shaft 1. The inner surface of the sleeve 4 has a substantially truncated double-cone shape, with a cross section diminishing from the ends. The sleeve 4 is mounted on a portion 5 of the crusher shaft 1 which has a corresponding double-cone shape, and the sleeve 4 is provided with external threads 6 fora stop nut 7 for the crusher member 2, which stopnut encircles the shaft 1. The sleeve 4 is downwardly shaped so that it guides the upper end of the crusher member 2.

The.stop nut 7 includes threaded bores which receive vertical screws 8. Screws 8 are adapted to be tightened against a horizontal surface 9 located at the upper end of the crusher member 2.

Between the lower surface of the stop nut 7 and the surface 9 of the member 2 there exists a substantial space having a height of, for example, 10 mm., so that the stop nut 7 can be untightened after the screws 8 are cut off beneath the stop nut, for example, by means of a cutting torch.

In the operation of the gyratory crusher there is a tendency for the crusher member 2 to apply a force to the lower ends of the screws 8. The screws 8 have a crosssectional area and are such in number that they are upset by an axial force so strong that it would be detrimental to other parts of the gyratory crusher, such as the stop nuts 7, sleeve 4, or crusher shaft 1. As a result, the screws 8 function to minimize the possibility of damage to other parts of the gyratory crusher. Moreover, as noted above, even though the screws 8 are upset, they can be easily cut off with a cutting torch for purposes of removing the stop nut.

The lower portion of the sleeve 4 is externally cylindrical and engages with a corresponding cylindrical inner surface 10 located at the upward end of the crusher housing 2, The parts of the sleeve 4 are detachably pinned to each other by means of substantially horizontal guide pins or studs (not shown).

The parts of the sleeve 4 which are attached on the crusher shaft 1 are detachably interconnected by tack welding or the like, preferably in a downwardly widened portion of slots made between the sleeve parts. The method of tack welding is, of course, well known and therefore should require no further explanation or illustration. Moreover the sleeve 4 is provided on its outside with a slot for receiving a filler which fills the space between the crusher member 2 and the crusher shaft 1. The filler is a known material and functions in a known manner.

What I claim is:

1. In a gyratory crusher comprising a crusher shaft for performing eccentric or epicyclic movement in a vertical crusher space, a crusher member clamped on the crusher shaft, and means including a stopnut for clamping said member on said shaft, the improvement wherein said stopnut is attached to a sleeve encircling said shaft, the inner surface of said sleeve defining substantially the shape of a truncated double cone with the inner surface of said sleeve tapering radially inwardly as the inner surface extends axially from the opposite ends of the sleeve, said sleeve being located on a portion of said crusher shaft having a double-cone shape corresponding to said shape defined by said inner surface and said sleeve having external threads for engaging the threads of said stopnut.

2. A gyratory crusher as defined in claim 1 further comprising a plurality of screws in said stopnut and adapted to be tightened against a horizontal surface on the upper end of said crusher member.

3. A gyratory crusher as defined in claim 2 wherein a subs antial space exists between the lower surface of said stopnut and said horizontal surface on said crusher member.

4. A gyratory crusher as defined in claim 2 wherein said screws extend substantially perpendicular to said horizontal surface and axially relative to said sleeve such that they may be upset when excessive axial force is encountered.

5. A gyratory crusher as defined in claim 4 wherein said sleeve is oriented vertically and the lower portion of said sleeve is externally cylindrical and engages with a corresponding cylindrical inner surface in said crusher member.

6. A gyratory crusher as defined in claim 1 wherein said sleeve is oriented vertically, and said sleeve further has on an upper end thereof said external threads receiving said stopnut.

7. In a gyratory crusher comprising a crusher shaft for performing eccentric or epicyclic movement in a vertical crusher space, a crusher member, having an upper surface, clamped on the crusher shaft, a sleeve encircling said crusher shaft and having surfaces for engaging surfaces of said crusher shaft for restraining movement of said sleeve axially of said crusher shaft in at least one direction, a'stop nut encircling and attached to said sleeve, said sleeve having external threads for engaging threads of said stop nut, and means carried by said stop nut extending axially relative to said sleeve and applying a force to said upper surface, said means comprising a plurality of screws which serve to space said stop nut from said upper surface of said crusher member and which may upset under forces applied thereto to reduce the likelihood of damage to the threads of said stop nut or said sleeve.

8. A gyratory crusher as defined in claim 7 wherein said surfaces of said sleeve and said crusher shaft for restraining movement of said sleeve axially of said crusher shaft define the shape of a truncated double cone.

Claims

3. A gyratory crusher as defined in claim 2 wherein a substantial space exists between the lower surface of said stopnut and said horizontal surface on said crusher member.

7. In a gyratory crusher comprising a crusher shaft for performing eccentric or epicyclic movement in a vertical crusher space, a crusher member, having an upper surface, clamped on the crusher shaft, a sleeve encircling said crusher shaft and having surfaces for engaging surfaces of said crusher shaft for restraining movement of said sleeve axially of said crusher shaft in at least one direction, a stop nut encircling and attached to said sleeve, said sleeve having external threads for engaging threads of said stop nut, and means carried by said stop nut extending axially relative to said sleeve and applying a force to said upper surface, said means comprising a plurality of screws which serve to space said stop nut from said upper surface of said crusher member and which may upset under forces applied thereto to reduce the likelihood of damage to the threads of said stop nut or said sleeve.