Cross Reference To Related Application

[0001] The present application claims the benefits, under 35 U.S.C.§ 1 19(e), of U.S.

Provisional Application Serial No. 62/250,637 filed November 4, 2015 entitled "Anti-Spin Apparatus and Method For Cone Crusher Head" 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, to crush material between the stationary inner conical surface of a bowl liner and the gyrating outer surface of the crusher head's mantle or head liner. The crusher head is given a gyrating motion by a rotating eccentric. When material is being crushed between the crusher head and the bowl liner, the crusher head is largely prevented from rotating relative to the bowl liner. However when no material is in the crushing cavity between the crusher head and the bowl liner, such as at start up, the spinning of the eccentric causes the crusher head also to spin and may reach the same velocity as the eccentric. This causes wear on the mantle and bowl liner when the material to be crushed is then admitted to the crushing cavity, causing an initial severe impact and braking. This also causes some of the material introduced into the crushing cavity to be violently flung from the machine, which again may damage the machine or risk injury to workers.

[0004] Prior solutions to this problem included the use of a clutch-based mechanism at the top of the crushing head which suffered from a number of drawbacks. United States Patent no. 6,065,698 discloses the use of fingers at a bottom portion of the crushing gap which engage to prevent spin. United States Patent no. 8,777, 143 discloses the use of a braking bush and an annular shoe which engage by centrifugal force during no-load condition to prevent spin. There remains a need therefore for a more effective means for selectively preventing spin of the crusher head during start-up, while releasing the head at other times. [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 arrangement and apparatus for counteracting spin of the crusher head is provided. An annular rubber muscle element held in the bowl frame is positioned between the bowl frame and the surface of the head, preferably the lower surface. The muscle element can be selectively placed into contact under pressure with the head surface to prevent spin during start up and then released during normal crushing operation.

[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 detail of the vertical cross-section of the head assembly of the cone crusher shown in Fig. 1 illustrating in perspective the anti-spin assembly;

[0012] Figures 3-5 are detail perspective views partly in cross-section of the anti-spin assembly shown in Fig. 2; [0013] Figure 6 is an elevation view partly in cross-section of the anti-spin assembly shown in Fig. 2;

[0014] Figure 7 is an exploded perspective view of the anti-spin assembly shown in Fig. 6;

[0015] Figures 8 are an elevation view partly in cross-section, top and bottom perspective views of the base plate for the anti-spin assembly shown in Fig. 6;

[0016] Figures 9 are an elevation view partly in cross-section, top and bottom perspective views of the outer clamp ring for the anti-spin assembly shown in Fig. 6; and

[0017] Figures 10 are an elevation view partly in cross-section, top and bottom perspective views of the outer clamp ring for the anti-spin assembly shown in Fig. 6. Description

[0018] 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.

[0019] With reference to Fig. 1 , cone crusher 10 has a bowl liner 12, mounted in bowl 14 which has a 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 shaft 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 and central shaft 16. A film of oil permits head ball 26 to move freely on socket liner 27. Eccentric 17 is motor driven to provide eccentric rotational motion. The crushing surface of crusher head 44 is formed by the mantle 28, referred to herein as the head liner 28, which is typically formed of manganese. Head liner 28 is removably fixed to the frusto-conical surface of head 44 by a compression bolt 33 or the like. [0020] Anti-spin assembly is shown in cross-section at 30 in Fig. 1 and in greater detail in Fig. 2 through 10. Anti-spin assembly comprises a circular base 36, muscle element 34 and outer clamp ring 32. Muscle element 34 is a rubber ring which has a T-shaped lower foot 48 extending downwardly from rubber annulus 50. The anti-spin assembly 30 is secured to bowl frame 40 by bolts 42 which extend through outer clamp ring 32 and base 36 into frame 40. Foot 48 of muscle element 34 is thereby held in the cavity formed between base 36 and clamp ring 32 with rubber annulus 50 sitting above the inner circumference 52 of base 36.

[0021] Base 36 is provided with an annular air or liquid manifold 46 which is adjacent the lower surface of foot 48 when the assembly 30 is assembled. Pressurized air or hydraulic fluid is provided to manifold 46 through supply line 56 and channel 54 (Fig. 2).

[0022] In operation, at start-up, air or liquid under pressure is supplied to manifold 46, which forces muscle element 34 against a surface of head 44, preferably the lower surface 45 of head 44 progressively in those sections where the head 44 is closest to the central shaft 16 (see Fig. 3) while at the opposite side of the central shaft 16 the head 44 is spaced from the muscle element 34 (Fig. 4). The frictional contact between muscle element 34 and the lower surface 45 of head 44 prevents motion of the head relative to the bowl 14. After material for crushing is introduced, the source of pressurized air/liquid to manifold 46 is cut off so that the muscle element 34 no longer contacts the head 44 which is then which is free to move relative to said bowl and is prevented from rotation with the eccentric by the friction of the crushed material between head liner 28 and bowl liner 12.

[0023] The crusher head 44 counter- rotates relative to the shaft 16 during crushing operation due to the difference in diameter between the head liner and the bowl liner. The rock which is being crushed acts like a gear, and when that gear is released, then crusher head 44 spins in the same direction as the shaft 16 due to oil friction between the crusher head 44 and the eccentric 17. The anti-spin mechanism can be activated and deactivated by signals from a PLC or other control device based on motor current draw, crusher cavity level sensor or the feed conveyor on/off signal.

[0024] 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 subcombinations thereof. It is therefore intended that the invention be interpreted to include all such modifications, permutations, additions and sub-combinations as are within its true spirit and scope.