US3273808A - Seal for gyratory crushers - Google Patents

Description

SePf- 20, 1966 H. BALMER ETAL 3,273,808

SEAL FOR GYRATORY CRUSHERS Original Filed Nov. 14, 1961 2 Sheets-Sheet l wwf WM Sept 20, 1966 H. BALMER ETAL 3,273,868

SEAL FOR GYRATORY CRUSHERS Original Filed Nov. 14. 1961 2 Sheets-Sheet :2

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/ zi? @if M ai zia y /Z M y United States Patent O 3,273,808 SEAL FR GYRATRY CRUSHERS Hansjrg Balmer, Langenthal Bern, Switzerland, and Rudolph J. Gasparac, Milwaukee, Wis., assignors to Nordberg Manufacturing Company, Milwaukee, Wis., a corporation of Wisconsin Original application Nov. 14, 1961, Ser. No. 152,222, now Patent No. 3,140,839, dated .luly 14, 1965. Divided and this application Apr. 8, 1964, Ser. No. 358,264 4 Claims. (Cl. 241-21S) This is a division of Serial No. 152,222 filed November 14, 1961, now U.S. Patent No. 3,140,839.

This invention is i-n the lield 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 eliicient in use.

Another object is a gyratory Crusher with an improved sealing arrangement to keep dust and dirt out of the bowl `threads which reduces the height of the Crusher significantly.

Other objects will appear from time to time in the ensuing speci-cation and drawings in which:

FIGURE l is a vertical section of a gyratory Crusher; and

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

In FIGURE l, 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 a base flange with an upstanding housing 12 and a supporting iiange 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 o-r 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 screwthreaded as at 102 to a bowl 104.

The bot-tom of the threads between the bowl and adjustment ring may be closed by a seal 234, which has a continuous annular sealing member with inner and outer lips 236 and 238 attached to the lower end of the adjustment ring. An outer cylindrical surface 239 in the form of a depending shield or plate 240 attached to -the adjustment ring may be opposite the outer lip of the sealing member and the bowl may have an inner cylindrical surface 242 extending upwardly from its lower edge to the point where the bowl thread starts. The adjustment ring may have a plurality of sockets 244 at suitable intervals .around the Crusher with a rod 246, each surrounded by a coil spring 248 or the like. The coil spring is supported on a ring 249 held in place by a snap ring so that the springs force the rods up, thereby keeping lthe sea] against the bottom of the adjustment ring. However, as the liner and mantle wear away and the bowl is adjusted do-wn, the bottom 250 of the bowl threads will contact the sealing member 234 about half way down. Fur-ther adjustment of the bowl down will push the seal down compressing the springs 248. When the mantle and liner `are sufficiently worn that they must be replaced, the bowl is turned |back up and the springs cause the seal to follow until the seal hits the bottom of the adjustment ring. During approximately the 3,273,808 Patented Sept. 20, 1966 ice first half of bowl adjustment down, the inner lip 236 of the seal wipes against the bowl surface 242, and during approximately the second half the outer lip 238 wipes against the adjustment ring surface 239. The arrangement shown has the advantage that the rods and springs are up inside the adjustment ring and will not be clogged by dirt, dust and moisture.

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 o-f 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, operaiton and function of the invention are as follows:

In prior gryatory Crushers, the botto-m of 4the threads between the adjustment ring and bowl have been sealed by a simple wiping contact seal. The seal previously had to be as long as the total travel of the head from the time new manganese was installed until it was completely worn out and needed replacing. In large Crushers, this could be a substantial distance. Further, the threads between the adjustment ring and bowl had. to have a certain minimum engagement at each end of travel, for example two full turns or threads engaged. Since the bottom seal for these threads had to clear in all positions, the head height of the crusher was necessarily increased.

The present seal has the advantage that it travels with the bowl during approximately one-half of the bowl movement during adjustment. In FIGURE 2, for example, the bowl may be considered to be in its maximum raised position with new manganese in place. The seal 234 stays in the position shown until, due to manganese wear, the bowl has been turned down to where the bottom 250 of the bowl threads contact the seal. Thereafter, as the bowl is turned down during adjustment for further manganese wear, the seal 234 will ride down with the bowl.

During the rst portion, the inner lip 236 slides against surface 242. During the second portion., the outer lip 238 slides along surface 239.

The springs should be constructed to force the seal up with sufficient thrust to overcome gravity and the down friction of the bowl. The arrangement has the additional advantage that the springs are totally enclosed in the adjustment ring behind and fully protected by the seal itself. Thus, no dirt, dust and foreign matter from the crushing opera-tion can clog or jam the springs or the rods that hold the springs.

We claim:

1. In a gyratory Crusher, a main frame, a gyratory head positioned in the main frame, a bowl mounted in the main frame defining a crushing cavity with the head and constructed to be adjusted vertically to vary the size of the crushing cavity, .and a seal between the bowl and main frame including generally concentric cylindrical surfaces on the bowl and main frame, a seal ring between the surfaces bearing on each and connected to one, means for biasing the seal ring toward one extreme position of movement, and means for engaging the seal after a predetermined amount of adjustment of the bowl to overcome the biasing means so that the seal ring thereafter moves with the bowl.

2. The structure of claim 1 further characterized by .and including an adjustment ring yieldably mounted on the main frame, the bowl being screw threaded i-nto the adjustment ring, the seal ring being effective between the bowl and adjustment ring.

3. The structure of claim 2 further characterized in that the seal ring is held against the adjustment ring by ing below the normal position of the seal ring such that 5 during approximately the first half of rotary adjustment of the bowl, the inner portion of the seal ring will bear and slide against the concentric surface on the bowl, and during approximately the second half of bowl adjustment, the

bottom of the bowl threads will engage the seal ring land lo force it down, compressing the springs, with the outside of the seal ring bearing and sliding against the concentric surface on the adjustment ring.

4. The structure of claim 3 further characterized in that the springs are mounted in sockets in the adjustment ring such that when the seal ring is in its upper position, it fully protects the springs by sealing Contact with the concentric surfaces.

References Cited by the Examiner UNITED STATES PATENTS 3,009,660 11/1961 Symons et al 241-290 ROBERT C. RIORDON, Primary Examiner.

H. F. PEPPER, JR., Assistant Examiner.

Claims (1)

1. IN A GYRATORY CRUSHER, A MAIN FRAME, A GYRATORY HEAD POSITIONED IN THE MAIN FRAME, A BOWL MOUNTED IN THE MAIN FRAME DEFINING A CRUSHING CAVITY WITH THE HEAD AND CONSTRUCTED TO BE ADJUSTED VERTICALLY TO VARY THE SIZE OF THE CRUSHING CAVITY, AND A SEAL BETWEEN THE BOWL AND MAIN FRAME INCLUDING GENERALLY CONCENTRIC CYLINDRICAL SURFACES ON THE BOWL AND MAIN FRAME, A SEAL RING BETWEEN THE SURFACES BEARING ON EACH AND CONNECTED TO ONE, MEANS FOR BIASING THE SEAL RING TOWARD ONE EXTREME POSITION OF MOVE-

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