US 12,083,663 B2
Rock breaking machine and method for storing pressure energy
Erik Airas, Tampere (FI)
Assigned to Sandvik Mining and Construction Oy, Tampere (FI)
Appl. No. 17/796,336
Filed by SANDVIK MINING AND CONSTRUCTION OY, Tampere (FI)
PCT Filed Jan. 29, 2021, PCT No. PCT/EP2021/052121
§ 371(c)(1), (2) Date Jul. 29, 2022,
PCT Pub. No. WO2021/152098, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 20155036 (EP), filed on Jan. 31, 2020.
Prior Publication US 2023/0069735 A1, Mar. 2, 2023
Int. Cl. B25D 9/14 (2006.01); F15B 1/04 (2006.01)
CPC B25D 9/145 (2013.01) [F15B 1/04 (2013.01); B25D 2209/002 (2013.01); B25D 2222/72 (2013.01); B25D 2250/365 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A hydraulic rock breaking machine, comprising:
a percussion device including a frame and a piston arranged inside the frame and configured to perform reciprocating longitudinal movement due to pressure of hydraulic fluid fed to the percussion device;
a tool connectable to the percussion device and configured to receive impact pulses from the percussion device;
a hydraulic system of the percussion device, the hydraulic system including a feed port for feeding hydraulic pressure fluid into the percussion device and a discharge port for discharging the pressure fluid out of the percussion device, and pressure conduits for directing the pressure fluid to and out of working pressure spaces of the piston; and
a pressure accumulator for storing hydraulic pressure energy and being connected to the hydraulic system, wherein the pressure accumulator is located at an extension of the piston so that an upper end of the piston moves inside a hydraulic space of the accumulator during the operation of the percussion device and wherein the accumulator comprises:
a casing defining an inner space;
an elastic membrane arranged inside the inner space and configured to divide the inner space into two separate pressure spaces, wherein a gas space is prefilled with pressurized gas, and on the opposite side of the membrane is a hydraulic space for receiving hydraulic fluid;
a flange element, wherein the membrane has radial side walls, edges at its open first axial end and a closed top end at its opposite second axial end, wherein the edges of the membrane are mounted between the casing and the flange element, the edges of the membrane having a transverse mounting flange, whereby the membrane has a hat-like configuration, the mounting flange, of the membrane is being pressed in an axial direction of the accumulator between the casing and the flange element;
the flange element including at least one pressure channel for feeding hydraulic fluid to the hydraulic space and for discharging hydraulic fluid, whereby the pressure channel allows provision of hydraulic fluid flow from a hydraulic operating system of the rock breaking machine to and out of the hydraulic space (18) during the operation of the machine;
the flange element including a central sleeve-like support portion protruding axially inside the casing, whereby an outer surface of the support portion is configured to provide axial support for the membrane at least when the hydraulic rock breaking machine is non-pressurized; and
wherein an inner surface of the support portion of the flange element is provided with sealing elements for sealing an end portion of the piston.