US3276702A - Crusher frame - Google Patents

Description

Oct. 4, 1966 L. G. sYMoNs 3,276,702

CRUSHER FRAME Original Filed Nov. 14, 1961 2 Sheets-Sheet 1 INVENTOR.

Get. 4, 1966 G. SYMONS 3,276,702

CRUSHER FRAME Original Filed Nov. 14, 1961 2 Sheets-Sheet 2 INVENTOR.

United States Patent Calif assignor to Milwaukee, Wis.,

This is a division of Serial No. 152,221, filed November 14, 1961 and issued as Patent No. 3,140,834 on July 14, 1964.

This invention is in the field of material reduction machines and is concerned, among other things, with an improved gyratory crusher.

A primary object of the invention is an improved gyratory crusher which is eflicient in use.

Another object is an adjustment or tilting ring and frame for a gyratory crusher which avoids abrasive or adhesive wear on their contacting surfaces.

Another object is an improved tilting ring and frame for a gyratory crusher.

Other objects will appear from time to time in the ensuing specification and drawings in which:

FIGURE 1 is a vertical section of a gyratory crusher; and

FIGURE 2 is a portion of FIGURE 1, on an enlarged scale.

In FIGURE 1, a crusher has been shown generally including the following main parts, a main frame A which supports a bowl structure B releasably held on the main frame by a release mechanism C and arranged to be adjusted by an adjustment mechanism D. The main frame also supports a crushing head E defining a crushing cavity with the bowl.

The main frame A includes abase flange with an upstanding housing 12 and a supporting flange 14 for the bowl structure at the upper end. The base flange is connected to a center hub 16 by a Web structure 18. The center hub supports an eccentric 20 which has a suitable counterweight 22 at its upper end overhanging the upper end of the center hub and connected to a ring gear 23 by bolts 24 or the like, which in turn is driven by a pinion 25 on a drive shaft 26 which in turn may be driven by a belt and pulley arrangement or any suitable means, not shown.

The bowl structure B may include an adjustment or tilting ring 100 screw-threaded as at 102 to a bowl 104. As shown in FIGURE 2, the adjustment ring rests on and is supported by an upstanding annular flange 106 on the main frame with the two having opposed upwardly and inwardly directed or convergent contacting or abutting surfaces 108, 108a which constitute the sole support or contact between the bowl structure and frame. Each of the contacting surfaces includes an upper conic portion 110, 110a, shown as disposed at, roughly, a 45 angle to the crusher axis, followed on the lower outside by separating inwardly curved portions 112 on the adjustment ring and 114 on the frame. The inwardly curved surfaces 112 and 114 may be formed each on a constant radius or they might be otherwise developed, depending upon the forces involved. When the adjustment ring 100 tilts up at one side of the crushing cavity due to uncrushable material in the cavity, the surfaces 112 and 114 at the opposite side of the adjustment ring and frame contact, with the conic surfaces 110 separated. Within manufacturing limits, the force should always be normal to the point of contact between the surfaces 112 and 114.

The curve 112 is swung on a somewhat greater radius than the curve 114, so that when the bowl tilts on one 3,276,702 Patented Oct. 4, 1966 ice side, the adjustment ring will roll on the other side with a smooth rolling contact with no slip between 112 and 114, without sliding or rubbing. At the upper inner end the conic surfaces separate, as at 116, and the adjustment ring includes a depending skirt 118 which is threaded on its inner surface and is spaced from the main frame, as at 120 in FIGURE 2, on its outer surface.

It will be realized that whereas a practical and operative device has been described and claimed, nevertheless many changes may be made in the size, shape, number and disposition and relation of parts without departing from the spirit of the invention. It is, therefore, wished that the description and drawings be taken as in a broad sense illustrative or diagrammatic rather than as limiting to the precise showing.

The use, operation and function of the invention are as follows:

In prior crushers, the contacting surfaces between the main frame and the tilting ring have been conical and disposed small end down, such as shown in US. Patent No. 3,019,994. That particular arrangement has led to a cavitating or pitting condition, resulting from what is known as skid welding, between the opposed surfaces requiring all sorts of expensive repairs involving welding, grinding, excessive down time, at great expense and trouble. Repairing these surfaces requires that the bowl and adjustment ring be taken off, which means that the crusher is down. This can involve days and weeks of lost time.

In the present arrangement, a rolling contact is provided which eliminates this pitting or skid welding problem.

The adjustment ring 100 is normally maintained firmly pressed downwardly against an upper edge portion of the main frame 12. The relationship of the parts is shown in detail in FIGURE 2. The entire supporting contact is provided normally by the opposed conic surfaces 110. During normal crushing, the entire bowl support is, therefore, provided by the outer surface of the main frame flange 106, which, as is clear from FIGURES 1 and 2, is generally conic. However, when uncrushable material is present in the crushing cavity, the ring 100 is lifted, at one side of the cavity, in such fashion as to separate the opposed conic surfaces of ring and main frame flange. A rolling outside contact is provided between the opposed surfaces 112 and 114. In any event, it is the contact of the ring 100 with some part of the outer surface of the flange 106 which constitutes the sole supporting connection between the bowl structure as a Whole and the main frame. This is in contrast to previous structures, such as are shown, for example, in Patent No. 2,358,038, Symons et al., dated September 12, 1944, in which a simultaneous contact is indicated between the exterior and interior faces of the main frame flange and the exterior and inner faces of a channel in a corresponding adjustment ring. In the structure of the above mentioned patent, during normal crushing the adjustment ring has an inner portion which fits like a cork or stopper within a surrounding surface of the main frame. It turns out, in practice, that it is diflicult, eflectively, to maintain any such double contact. The attempt to do so causes difliculties of wear and damage to the opposed parts which, in practice, are extreme.

I claim:

1. In a gyratory crusher, a main frame, a bowl structure supported on the main frame, and means for releasably supporting the bowl structure on the main frame, including upwardly and inwardly extending generally conic circumferential contacting surfaces constituting the sole supporting contact between the bowl structure and main frame during normal operation, the contacting surfaces including an intermediate portion which, in vertical cross section, is generally rectilinear, and normally noncontacting concave-convex generally arcuate sections extending downwardly and outwardly therefrom, and yielding means for normally holding the generally rectilinear surfaces in contact.

2. The structure of claim 1 further characterized in that the concave-convex generally arcuate sections are developed such that when such surfaces are in contact due to the bowl structure rising away from the frame on one side, the force between such surfaces will be generally normal to the point of contact there/between.

3. The structure of claim 1 further characterized in that the normally non-contacting concave-convex arcuate sections are swung on different but sufiiciently close radii such that they contact when the bowl structure is tilted up only a small amount on one side.

References Cited by the Examiner UNITED STATES PATENTS 2/1939 Fahrenwald 24l2l5 1/1955 Traylor 241209 ROBERT C. RIORDON, Primary Examiner.

15 D KELLY, Assistant Examiner.

Claims (1)

1. IN A GYRATORY CRUSHER, A MAIN FRAME, A BOWL STRUCTURE SUPPORTED ON THE MAIN FRAME, AND MEANS FOR RELEASABLY SUPPORTING THE BOWL STRUCTURE ON THE MAIN FRAME, INCLUDING UPWARDLY AND INWARDLY EXTENDING GENERALLY CONIC CIRCUMFERENTIAL CONTACTING SURFACES CONSTITUTING THE SOLE SUPPORTING CONTACT BETWEEN THE BOWL STRUCTURE AND MAIN FRAME DURING NORMAL OPERATION, THE CONTACTING SURFACES INCLUDING AN INTERMEDIATE PORTION WHICH, IN VERTICAL CROSS SECTION, IS GENERALLY RECTILINEAR, AND NORMALLY NONCONTACTING CONCAVE-CONVEX GENERALLY ARCUATE SECTIONS EXTENDING DOWNWARDLY AND OUTWARDLY THEREFROM, AND YIELDING MEANS FOR NORMALLY HOLDING THE GENERALLY RECTILINEAR SURFACES IN CONTACT.

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