公开(公告)号：US20220176535A1

公开(公告)日：2022-06-09

申请号：US17436732

申请日：2020-03-16

Applicant: SANDVIK MINING AND CONSTRUCTION OY

Inventor： Antti KOSKIMAKI ,  Mikko HAMALAINEN ,  Matti VIINIKKA

IPC: B25D17/28 ,  B25D9/14 ,  E21B4/14

Abstract: A rock drilling arrangement includes an impact device having a frame, pressure chambers in the frame, and a piston arranged in the impact device. The arrangement further includes a rear mounting arrangement for attaching the impact device to a carriage, a front mounting arrangement for attaching the impact device to a machine component, at least one fore pressure accumulator arranged on a front side of the rear mounting arrangement in an axial direction of the piston, and at least one rear pressure accumulator arranged on a back side of the rear mounting arrangement. The fore pressure accumulator and the rear pressure accumulator are connected to one of the pressure chambers and arranged to absorb pressure fluctuations in the pressure chambers.

公开(公告)号：US20230294260A1

公开(公告)日：2023-09-21

申请号：US17928683

申请日：2021-06-01

Applicant: SANDVIK MINING AND CONSTRUCTION OY

Inventor： Antti KOSKIMAKI ,  Lars KANDELIN ,  Mikko HAMALAINEN ,  Timo KELA ,  Matti VIINIKKA ,  Esa LAAKKOLA

IPC: B25D17/06 ,  B25D9/12 ,  E21B1/26

CPC classification number: B25D17/06 ,  B25D9/12 ,  E21B1/26 ,  B25D2217/0019 ,  B25D2250/125 ,  B25D2250/331

Abstract: A piston guiding element, rock drilling machine and method for supporting a front end portion of a percussion piston of a rock drilling machine. The piston guiding element includes a braking recess at its rear end. The element further includes at least one bearing sleeve, which is provided with two axially successive slide bearing sections. Hydraulic fluid is conveyed between the slide bearing sections via a feed system.