Improved disc cutter and excavation equipment

Details Improved disc cutter and excavation equipment Improved disc cutter and excavation equipment

E - Fixed Constructions

21

B

E21B 10/12 (2006.01) E21B 10/22 (2006.01) E21B 10/50 (2006.01) E21D 9/10 (2006.01)

Patent

CA 2260809

A disc type rolling rock cutter (120), and cutter-heads (420) employing such cutters. A rock cutter (120) with compact bearing (130), and a smooth, rounded blade shape is disclosed. The design incorporates a cutter ring (128), bearing assembly (130), and seal assembly (136). The simplified assembly is achieved by using a comparatively large cutter shaft (122) which is normally in the range of 30-50 % of the ring diameter. The shaft design is sufficiently robust to permit a cantilever mount of the cutter (120). Also, a method of shaping and installing hard metal inserts (302) improves cutting efficiency over the life of the cutter, and increases wear life in highly abrasive conditions.

L'invention a trait à un instrument à couper la roche du type à disque rotatif (120) ainsi qu'à ses têtes de coupe (420). Elle a également trait à un instrument à couper la roche (120) pourvu d'un roulement compact (130) et d'une lame lisse de forme arrondie. Cet instrument comporte un disque de coupe (128), un roulement (130) et un joint (136). Un arbre de coupe (122) relativement important, dont le diamètre, en règle générale, est de 30 à 50 % celui du disque, complète cette version simplifiée de l'instrument. L'arbre est suffisamment robuste pour permettre un montage en porte-à-faux de l'instrument (120). Il est également présenté un procédé de taille et d'installation de plaquettes de métal dur (302) qui augmentent l'efficacité de coupe pendant la durée utile de cet instrument ainsi que sa résistance à l'usure dans des condition hautement abrasives.

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