Cross Reference To Related Application

[0001] The present application claims the benefits, under 35 U.S.C.§ 119(e), of U.S. Provisional Application Serial No. 62/ 249,800 filed November 2, 2015 entitled "Compression Bolt For A Cone Crusher" which is incorporated herein by this reference.

Technical Field

[0002] The invention relates generally to the field of crushers, and more specifically relates to the field of cone or gyratory crushers.

Background

[0003] Cone or gyratory crushers utilize a gyrating conical crusher head or cone head, which has secured to it an outer conical crushing surface or mantle typically made of manganese and which is a replaceable wear part. The material is crushed between the stationary inner conical surface of a bowl liner and the gyrating outer surface of the crusher head mantle. Since the mantle must be periodically replaced it is typically attached to the crusher head by a head bolt. Due to the high forces involved it is often difficult to remove the head bolt, or it may become loosened prematurely.

[0004] There is a need therefore for a more effective compression bolt attachment for securing the mantle (referred to herein as the "head liner") to the crusher head of a cone crusher to permit the head liner to be more readily replaced.

[0005] The foregoing examples of the related art and limitations related thereto are intended to be illustrative and not exclusive. Other limitations of the related art will become apparent to those of skill in the art upon a reading of the specification and a study of the drawings. Summary

[0006] The following embodiments and aspects thereof are described and illustrated in conjunction with systems, tools and methods which are meant to be exemplary and illustrative, not limiting in scope. In various embodiments, one or more of the above- described problems have been reduced or eliminated, while other embodiments are directed to other improvements.

[0007] A more effective crusher head design is provided which comprises a novel compression bolt arrangement for replacing the head liner. The compression bolt incorporates an array of tightening bolts which are aligned in a direction parallel to the outer surface of the head. A compression washer is used between such bolts and the mantle whereby a surface of the compression washer bears against the upper surface of the head liner. The force of the bolts is thereby directed parallel to the surface of the head to most efficiently tighten the head liner against the head.

[0008] In addition to the exemplary aspects and embodiments described above, further aspects and embodiments will become apparent by reference to the drawings and by study of the following detailed descriptions. Brief Description of the Drawings

[0009] Exemplary embodiments are illustrated in referenced figures of the drawings. It is intended that the embodiments disclosed herein are to be considered illustrative rather than restrictive. [0010] Figure 1 is a vertical cross-section of a cone crusher according to the invention;

[0011] Figure 2 is a vertical cross-section of the head assembly of the cone crusher shown in Fig. 1; [0012] Figure 3 is a perspective view of the vertical cross-section of the head assembly of a cone crusher shown in Fig. 2;

[0013] Figure 4 is a perspective view of the head according to the invention; and

[0014] Figure 5 is a vertical cross-section of the head shown in Fig. 4;

[0015] Figure 6 is a perspective view of the compression bolt according to the invention;

[0016] Figure 7 is an elevation view of the compression bolt shown in Fig. 6;

[0017] Figure 8 is a top perspective view of the head liner according to the invention;

[0018] Figure 9 is a bottom perspective view of the head liner shown in Fig. 8;

[0019] Figure 10 is a top perspective view of the compression washer according to the invention;

[0020] Figure 11 is a cross-section of the compression washer taken along lines A-A of Fig. 8;

[0021] Figure 12 is a top perspective view of the cap according to the invention;

[0022] Figure 13 is a perspective view of a second embodiment of the invention in which the compression bolt is structured as a nut rather than as a bolt; and

[0023] Figure 14 is a perspective view of the compression bolt using an impact- wrench adapted attachment bolt. Description

[0024] Throughout the following description specific details are set forth in order to provide a more thorough understanding to persons skilled in the art. However, well known elements may not have been shown or described in detail to avoid

unnecessarily obscuring the disclosure. Accordingly, the description and drawings are to be regarded in an illustrative, rather than a restrictive, sense.

[0025] With reference to Fig. 1, cone crusher 10 has a stationary bowl liner 12, mounted in bowl 14 which has a central vertical axis 16 and feed opening 18. Bowl liner 12 has a generally conical interior surface 20. The crusher head assembly 22 extends upwardly into space 24 formed by bowl liner 12. In operation, crusher head assembly 22 gyrates about the central axis 16 on head ball 26. The crusher head assembly 22 is secured to head ball 26 by a nut 23 and socket washer 25. Head assembly 22 is thereby provided gyratory movement through head ball 26 which rests freely on socket liner 27 of socket 15 and main shaft 29. A film of oil permits head ball 26 to move freely on socket liner 27. Eccentric 17 is motor driven to provide an eccentric rotational motion which provides the head assembly with gyratory movement by contact of its outer surface on the inner surface of the head assembly 22. The crushing surface of crusher head assembly 22 is formed by the head liner 28, which is typically formed of manganese, and requires periodic replacement. Head liner 28 is fixed to the frusto-conical surface of head 30 by compression bolt 32.

[0026] Crusher head assembly 22 is shown in greater detail in Fig. 2 and 3. Head 30 (Fig. 4, 5) has a frusto-conical surface 34 and an axially extending threaded aperture 36 with threads 38 which engage threads 40 on cylindrical bolt extension 42 of compression bolt 32 (Fig. 6, 7). Compression bolt 32 has an upper flanged head 44 having an upwardly opening central hollow recess 46, and flange 48 having upper outer frusto-conical surface 50, lower outer frusto-conical surface 52 and inner frusto- conical surface 54. An array of threaded passages 56 extend from surface 54 to surface 52. Threaded passages 56 receive threaded flanged bolts 58 (see Fig. 2 and 3) having complementary threaded surfaces. A central threaded aperture 60 in compression bolt 32 receives a threaded bolt 62 which secures a cap 64 over the compression bolt 32.

[0027] Head liner 28 as shown in Fig. 8 and 9 has a generally frusto-conical inner surface 66, and outer surface 68 has multiple angled contiguous frusto-conical surfaces 70, 72 and 74. Three radially extending protrusions 76 serve to permit lifting of the head liner 28. The different lengths and angles of surfaces 70, 72 and 74 are selected to permit adjustment for the size of the material to be crushed and the size of crushed material. Inner surface 66 is preferably smooth but to avoid locking on the surface of head 30 may be provided with concentric grooves 67 to facilitate removal.

[0028] A compression washer 78, shown in Fig. 3, 10 and 11, transfers force along a vector tangential to the surface 34 of head 30, from flanged bolts 58 to surface 88 of compression washer 78. Surface 86 of compression washer 78 bears against surface 80 of head liner 28. The force of bolts 58 is thereby directed parallel to the surface 34 of head 30 to most efficiently tighten the head liner 28 against head 30. Optional O- ring 90 (Fig. 3) may be provided to seal between cap 64 and compression washer 78.

[0029] In initial assembly, head liner 28 is placed on head 30. Compression washer 78 is placed against surface 80 as shown in Fig. 3. Compression bolt 32 is threaded by hand into the head 30 to provide hand tightness of surface 52 against surface 88. Bolts 58 are then tightened to tighten the head liner in place against the head 30. Bolt 62 is then threaded into cap 64 and threaded into compression bolt 32 to secure cap 64. To replace the worn head liner 28, bolt 62 is unthreaded to remove cap 64.

Flanged bolts 58 are then loosened and compression bolt 32 is unthreaded and removed along with compression washer 78. As shown in Fig. 14, bolt 32 is preferably suited for removal by an impact wrench applied to nut 63, which forms part of bolt 32, such as by welding. Head liner 28 is then removed and replaced and the foregoing steps reversed to tighten the replacement head liner 28 onto head 30. [0030] Fig. 13 illustrates a second embodiment in which the compression bolt instead is configured as a nut. The configuration is the same as compression bolt 32 but in this embodiment the head 30 is provided with threaded bolt 84. Compression nut 82 has a central threaded aperture 186 which engages the threads of bolt 84. Hand tightening of compression nut 82 on bolt 84 causes a surface of the compression nut to bear against surface 80 of the compression washer as in the previous embodiment.

[0031] While a number of exemplary aspects and embodiments have been discussed above, those of skill in the art will recognize certain modifications, permutations, additions and sub-combinations thereof. It is therefore intended that the invention be interpreted to include all such modifications, permutations, additions and subcombinations as are within their true spirit and scope.