公开(公告)号：US20240271488A1

公开(公告)日：2024-08-15

申请号：US18436243

申请日：2024-02-08

Applicant: SANDVIK MINING AND CONSTRUCTION OY

Inventor： Jarno VIITANIEMI ,  Pertti PARKKINEN ,  Martti LESKINEN ,  Mikko HAMALAINEN ,  Perttu KOIVUMAKI ,  Timo KELA ,  Ville KOHOLA

IPC: E21B7/02

CPC classification number: E21B7/022 ,  E21B7/025

Abstract: An arrangement and method for heating an impact device of a rock treating machine (Rtm) in low-temperature operating conditions is provided. The arrangement includes a warm-up mode (WM) for feeding pre-heated hydraulic fluid through a feed channel to a hydraulic circuit of the impact device. One or more hydraulic accumulators are provided in the hydraulic circuit. The feed channel is provided with a control element for limiting the feeding of the pre-heated hydraulic fluid during the warm-up mode. The control element limits the feeding of the pre-heated hydraulic fluid in the feed channel so that separating elements of the pressure accumulators do not move.

公开(公告)号：US20240392628A1

公开(公告)日：2024-11-28

申请号：US18694639

申请日：2022-09-20

Applicant: SANDVIK MINING AND CONSTRUCTION OY

Inventor： Juho RANTANEN ,  Pertti PARKKINEN ,  Samuli VERHO ,  Harri VATANEN ,  Teemu HONGELL

IPC: E21B7/02 ,  E21B44/02

Abstract: A hydraulic system, rock drilling rig, and method for limiting the output performance of a hydraulic drilling actuator temporarily under execution of a safety function feature of the hydraulic system. The output performance is limited by limiting produced hydraulic fluid flow in a hydraulic circuit of the hydraulic drilling actuator, whereby a restricted magnitude of the fluid flow is produced at a hydraulic pump. This way a restricted operation mode is enabled and is controlled by a control unit.

公开(公告)号：US20240352954A1

公开(公告)日：2024-10-24

申请号：US18685331

申请日：2022-08-02

Applicant: SANDVIK MINING AND CONSTRUCTION OY

Inventor： Pertti PARKKINEN ,  Samuli VERHO ,  Teemu HONGELL

IPC: F15B21/00 ,  F15B15/18 ,  F15B19/00

CPC classification number: F15B21/005 ,  F15B15/18 ,  F15B19/00

Abstract: A hydraulic system, mining vehicle, and method for flushing a closed loop hydraulic circuit is provided. The hydraulic system includes at least one closed hydraulic circuit having a hydraulic pump, a motor and one or more hydraulic actuators. The hydraulic system further includes a flushing system arranged for discharging and feeding a limited amount of hydraulic fluid for flushing the closed loop hydraulic circuit. There is a discharge valve, which is actively controlled by a control unit so that fluid flow through the valve is selectively controlled.