Arrangement for controlling rock drilling
AssigneeSandvik Tamrock Oy
InventorRoger Noel
Life of this patent
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Abstract
The invention relates to a method for controlling rock drilling, and a rock drilling arrangement At least one feed channel (37) of a feed actuator (3, 33) is pro-vided with a restrictor (46), which causes a pressure drop if the penetration rate increases and, consequently, a flow through the restrictor increases. A pressure difference and an increase in the penetration rate can be detected by sensing the pressure before the restrictor and after the restrictor. When the feed rate increases, a hydraulic system is arranged to decrease a percussion pressure.
Claims16
A method for controlling rock drilling wherein a percussion device belonging to a rock drill machine delivers impact pulses to rock through a tool and wherein the rock drill machine is simultaneously pushed against the rock by means of a feed actuator the method comprising:
- feeding a pressure medium to the feed actuator along at least one feed channel;
- feeding the pressure medium to the percussion device along at least one percussion pressure channel;
- determining a penetration rate;
- an
- adjusting at least a percussion pressure on the basis of the penetration rate,
- conveying at least one pressure medium flow supplied to or from the feed actuator through at least one restrictor,
- sensing the pressure of the pressure medium before the restrictor and after the restrictor in order to determine the penetration rate, and
- adjusting the percussion pressure on the basis of the monitoring.
A rock drilling arrangement comprising:
- a rock drill machine including a percussion device arranged to generate impact pulses to a tool to be connected to the rock drill machine;
- a feed beam whereon the rock drill machine has been arranged;
- a feed actuator enabling the rock drill machine to be moved in the longitudinal direction of the feed beam;
- a pressure medium system comprising:
- at least one pressure source;
- at least one pressure medium channel leading to the percussion device;
- at least one feed channel connected to the feed actuator;
- and means for adjusting a percussion pressure, and wherein
- at least one restrictor is connected to at least one feed channel of the feed actuator,
- the arrangement comprises means for sensing the pressure active in the feed channel before the restrictor and after the restrictor, and
- the pressure medium arrangement is arranged to decrease the percussion pressure when the pressure in the feed channel after the restrictor is smaller than the pressure before the restrictor.
A rock drilling arrangement comprising:
- a rock drill machine including a percussion device arranged to generate impact pulses to a tool to be connected to the rock drill machine;
- a feed beam whereon the rock drill machine has been arranged;
- a feed actuator enabling the rock drill machine to be moved in the longitudinal direction of the feed beam;
- a pressure medium system comprising:
- at least one pressure source;
- at least one pressure medium channel leading to the percussion device;
- at least one feed channel connected to the feed actuator;
- and means for adjusting a percussion pressure, wherein
- the arrangement comprises at least one adjustment unit for controlling the feed actuator,
- at least two relief valves arranged in series in load-sense channel of the adjustment unit,
- at least one restrictor connected to the inlet feeding channel of the feed actuator,
- the arrangement comprises means for controlling the pressure difference between the inlet feeding channel of the feed actuator and a reference pressure sensed in-between the mentioned two relief valves in the load-sense circuit of the adjustment unit A of the feed actuator,
- the reference pressure in-between the two relief-valves is sensed,
- the pressure after the restrictor is sensed, and
- the arrangement comprises a control system which is arranged to decrease the percussion pressure when the pressure difference between the above-mentioned sensed pressures decreases.
Dependencies are inferred from the claim text.