The jaw crusher was invented in the middle of the 19th century, by an American named Blake. It is also referred to as double toggle jaw crusher. Tin ore jig grinding machine
Double toggle jaw crushers are used as coarse crushers and fine crushers. The principle of operation is intermittent. On a horizontal shaft with an eccentric centre section sits the pitman, which actuates the swing jaw through a double toggle lever system. The swing jaw is supported in sliding sleeves or rubber-bonded-to-metal bondings. Rolling bearings are installed in the pitman (inner bearings) and in the crusher frame (outer bearings).
The crushers feed opening can span more than 2000 mm. The eccentric shaft speed is between 180 and 280 min-1, depending on the crusher size.
Eccentric-shaft support in double toggle jaw crushers and single toggle jaw crushers
The outer bearings (b) both in double toggle jaw crushers (fig. 1) and in single toggle jaw crushers (fig. 2) have to support the eccentric shaft in the frame. The outer bearings are more heavily loaded than the inner bearings as they have to transmit not only the crushing forces but also have to support the flywheel weight and transmit the loads resulting from the drive.
The inner bearings (a) support the pitman in double toggle jaw crushers and the swing jaw in single toggle jaw crushers. Due to the eccentric shaft, the inner bearings have a larger bore than the outer bearings. tin ore beneficiation equipmentDouble toggle jaw crusher
Example: Double toggle jaw crusher type 12K lnner bearings: 2 spherical Toller bearings FAG 23168BKMB (340 x 500 x 190 mm) Adapter siceve FAG H3168HGJ Outer bearings: 2 spherical Toller bearings FAG 23256KMB (280 x 500 x 176 mm) Adapter sleeve FAG H2356HGJ.
Mainly spherical roller bearings of series 222 are used as inner bearings, and series 223 bearings as outer bearings. In some machines, spherical roller bearings of series 231 and 232 as well as 240 and 241 have been used successfully.
Outer bearing mountings usually consist of a locating bearing and a floating bearing. For inner bearing mountings a floating bearing arrangement (axial displaceability 1 to 2 mm) is preferably used. The bearings can be mounted either directly on the cylindrical or tapered shaft, or on adapter or withdrawal sleeves. The bearings are preferably fastened with hydraulic adapter sleeves (HGJ). Small milling machine