A gyratory crusher is a gravity-type machine. Materials flow from top to bottom. It receives a large, coarse feed, usually runof-mine, and its product usually requires additional crushing.
Gyratory crushers can be used for primary or secondary crushing. This segment describes gyratory crushers for primary crushing. Secondary gyratory crushers are described under secondary crushing.
Gyratory crushers DESCRIPTION
A primary gyratory crusher is illustrated in Fig. 25.3.1.3. The crushing action is caused by the closing of the gap between the mantle line (movable) mounted on the central vertical spindle and the concave liners (fixed) mounted on the main frame of the crusher. The gap is opened and closed by an eccentric on the bottom of the spindle that causes the central vertical spindle to gyrate. The vertical spindle is free to rotate around its own axis. The crusher illustrated is a short-shaft suspended spindle type, meaning that the main shaft is suspended
at the top and that the eccentric is mounted above the gear. The short-shaft design has superceded the long-shaft design in which the eccentric is mounted below the gear.
Gyratory crushers have been built in three types: suspended spindle, supported spindle, and fixed spindle. The supportedspindle and the suspended-spindle types are most common.
There are two suspended-spindle gyratory crusher designs: the short shaft and the long shaft. The short-shaft design is the modern design in which the eccentric is located above the level gear. The main frame has two sections; the upper shell supports the concaves while the lower shell contains the eccentric and the pinion shaft. The bevel gear and pinion provide rotation of the eccentric.
The crusher is either belt-driven or has direct drive A gyratory crusher is a gravity-type machine. Materials flowfrom top to bottom. It receives a large, coarse feed, usually runof-mine, and its product usually requires additional crushing.Gyratory crushers can be used for primary or secondary crushing. This segment describes gyratory crushers for primary crushing. Secondary gyratory crushers are described under secondarycrushing.
DESCRIPTION. A primary gyratory crusher is illustrated inFig. 25.3.1.3. The crushing action is caused by the closing of thegap between the mantle line (movable) mounted on the centralvertical spindle and the concave liners (fixed) mounted on themain frame of the crusher. The gap is opened and closed by aneccentric on the bottom of the spindle that causes the centralvertical spindle to gyrate. The vertical spindle is free to rotatearound its own axis. The crusher illustrated is a short-shaftsuspended spindle type, meaning that the main shaft is suspendedat the top and that the eccentric is mounted above the gear. Theshort-shaft design has superceded the long-shaft design in whichthe eccentric is mounted below the gear.Gyratory crushers have been built in three types: suspendedspindle, supported spindle, and fixed spindle. The supportedspindle and the suspended-spindle types are most common.
There are two suspended-spindle gyratory crusher designs:the short shaft and the long shaft. The short-shaft design is themodern design in which the eccentric is located above the levelgear. The main frame has two sections; the upper shell supportsthe concaves while the lower shell contains the eccentric and thepinion shaft. The bevel gear and pinion provide rotation of theeccentric. The crusher is either belt-driven or has direct drive.
Crusher Size— Gyratory crushers are designated either by the gape and mantle diameter or by the size of the receiving opening.
Crusher Speed—The speeds listed in the tables are pinion shaft rpms.
Crusher Settings—Both closed-side settings (CSS) and openside settings (OSS) are used for gyratory crushers. In contrast to the jaw crusher setting where closed-side settings are used, openside settings are used in sizing gyratory crushers.
GYRATORY CRUSHER SIZING. The crusher is selected on the basis of feed size or tonnage rate or both. A rule of thumb is that 80% of the feed to the crusher should have a maximum one-way dimension of less than two-thirds of the nominal feed opening.
This has limited value since in most cases, the average size distribution of the feed to the crusher is, at best, an educated guess. A more useful approach is to relate crusher size to the
size of the shovel dipper in the pit.
Capacities of short-shaft, primary gyratory crushers, as provided in manufacturers’ catalogs, are shown in Table 25.3.1.4, and the percentage of product passing a square opening is shown in Table 25.3.1.5.
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Gyratory Crushers
A gyratory crusher is a gravity-type machine. Materials flow from top to bottom. It receives a large, coarse feed, usually runof-mine, and its product usually requires additional crushing.
Gyratory crushers can be used for primary or secondary crushing. This segment describes gyratory crushers for primary crushing. Secondary gyratory crushers are described under secondary crushing.
Gyratory crushers DESCRIPTION
A primary gyratory crusher is illustrated in Fig. 25.3.1.3. The crushing action is caused by the closing of the gap between the mantle line (movable) mounted on the central vertical spindle and the concave liners (fixed) mounted on the main frame of the crusher. The gap is opened and closed by an eccentric on the bottom of the spindle that causes the central vertical spindle to gyrate. The vertical spindle is free to rotate around its own axis. The crusher illustrated is a short-shaft suspended spindle type, meaning that the main shaft is suspended
at the top and that the eccentric is mounted above the gear. The short-shaft design has superceded the long-shaft design in which the eccentric is mounted below the gear.
Gyratory crushers have been built in three types: suspended spindle, supported spindle, and fixed spindle. The supportedspindle and the suspended-spindle types are most common.
There are two suspended-spindle gyratory crusher designs: the short shaft and the long shaft. The short-shaft design is the modern design in which the eccentric is located above the level gear. The main frame has two sections; the upper shell supports the concaves while the lower shell contains the eccentric and the pinion shaft. The bevel gear and pinion provide rotation of the eccentric.
The crusher is either belt-driven or has direct drive A gyratory crusher is a gravity-type machine. Materials flowfrom top to bottom. It receives a large, coarse feed, usually runof-mine, and its product usually requires additional crushing.Gyratory crushers can be used for primary or secondary crushing. This segment describes gyratory crushers for primary crushing. Secondary gyratory crushers are described under secondarycrushing.
DESCRIPTION. A primary gyratory crusher is illustrated inFig. 25.3.1.3. The crushing action is caused by the closing of thegap between the mantle line (movable) mounted on the centralvertical spindle and the concave liners (fixed) mounted on themain frame of the crusher. The gap is opened and closed by aneccentric on the bottom of the spindle that causes the centralvertical spindle to gyrate. The vertical spindle is free to rotatearound its own axis. The crusher illustrated is a short-shaftsuspended spindle type, meaning that the main shaft is suspendedat the top and that the eccentric is mounted above the gear. Theshort-shaft design has superceded the long-shaft design in whichthe eccentric is mounted below the gear.Gyratory crushers have been built in three types: suspendedspindle, supported spindle, and fixed spindle. The supportedspindle and the suspended-spindle types are most common.
There are two suspended-spindle gyratory crusher designs:the short shaft and the long shaft. The short-shaft design is themodern design in which the eccentric is located above the levelgear. The main frame has two sections; the upper shell supportsthe concaves while the lower shell contains the eccentric and thepinion shaft. The bevel gear and pinion provide rotation of theeccentric. The crusher is either belt-driven or has direct drive.
Crusher Size— Gyratory crushers are designated either by the gape and mantle diameter or by the size of the receiving opening.
Crusher Speed—The speeds listed in the tables are pinion shaft rpms.
Crusher Settings—Both closed-side settings (CSS) and openside settings (OSS) are used for gyratory crushers. In contrast to the jaw crusher setting where closed-side settings are used, openside settings are used in sizing gyratory crushers.
GYRATORY CRUSHER SIZING. The crusher is selected on the basis of feed size or tonnage rate or both. A rule of thumb is that 80% of the feed to the crusher should have a maximum one-way dimension of less than two-thirds of the nominal feed opening.
This has limited value since in most cases, the average size distribution of the feed to the crusher is, at best, an educated guess. A more useful approach is to relate crusher size to the
size of the shovel dipper in the pit.
Capacities of short-shaft, primary gyratory crushers, as provided in manufacturers’ catalogs, are shown in Table 25.3.1.4, and the percentage of product passing a square opening is shown in Table 25.3.1.5.