US 12,480,364 B2
Arrangement and method for heating hydraulic impact device
Jarno Viitaniemi, Tampere (FI); Pertti Parkkinen, Tampere (FI); Martti Leskinen, Tampere (FI); Mikko Hamalainen, Tampere (FI); Perttu Koivumaki, Tampere (FI); Timo Kela, Tampere (FI); and Ville Kohola, Tampere (FI)
Assigned to Sandvik Mining and Construction Oy, Tampere (FI)
Filed by SANDVIK MINING AND CONSTRUCTION OY, Tampere (FI)
Filed on Feb. 8, 2024, as Appl. No. 18/436,243.
Prior Publication US 2024/0271488 A1, Aug. 15, 2024
Int. Cl. E21B 7/02 (2006.01); E02F 9/22 (2006.01); E21B 1/26 (2006.01); E21B 44/02 (2006.01); F15B 15/14 (2006.01); F15B 21/0427 (2019.01); B25D 9/12 (2006.01); E21B 44/06 (2006.01)
CPC E21B 7/022 (2013.01) [E02F 9/22 (2013.01); E21B 1/26 (2020.05); E21B 7/025 (2013.01); E21B 44/02 (2013.01); F15B 15/1485 (2013.01); F15B 21/0427 (2019.01); B25D 9/12 (2013.01); E02F 9/2292 (2013.01); E21B 44/06 (2013.01)] 9 Claims
OG exemplary drawing
 
8. A method of heating an impact device of a rock treating machine in low-temperature operating conditions, the method comprising:
conducting pre-heated hydraulic fluid selectively to a hydraulic circuit of the impact device for providing the rock treating machine with a warm-up mode;
executing the warm-up mode before initiating a normal operational mode;
conducting the pre-heated hydraulic fluid in a hydraulic circuit of the impact device via at least one pressure accumulator provided with a pre-charge pressure;
conducting the pre-heated hydraulic fluid through at least one control element to the hydraulic circuit of the impact device during the warm-up mode; and
limiting feeding of the pre-heated hydraulic fluid to the impact device by means of the control element for reducing pressure at a first pressure accumulator below a first pre-charge pressure of the first pressure accumulator, which is a first of the at least one pressure accumulator receiving the pre-heated hydraulic fluid in a downstream direction.