Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Patent
1993-10-13
1995-10-17
Melius, Terry Lee
Boring or penetrating the earth
Automatic control
Of advance or applied tool weight
175114, 173 6, 731515, E21B 302
Patent
active
054582075
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for optimizing rock drilling, wherein a penetration rate of a drill bit of a drilling machine into a rock is measured and the operating parameters of a drilling equipment are adjusted to maximize the penetration rate.
The invention also relates to an equipment for realizing the method described above, comprising control devices for giving set values to a percussion apparatus of a rock drilling equipment, a rotation rate of a drill bit and a feed force, and means for measuring a penetration rate of the drill bit.
As is well known, the adjustment of a rock drilling machine is based on set values and limits determined by the operator, who sets the percussion power, the rotation power and the feed on the basis of his experience so as to optimize the drilling result. This procedure is poor and it often results in equipment damages or inferior drilling results.
European Patent Specification 112 810 discloses a method in which the percussion rate and percussion frequency of a percussion hammer is measured and varied until the maximum penetration rate is achieved. The frequency and percussion rate are varied so that the percussion power remains substantially constant all the time. A disadvantage of the method is that one attempts to maximize the penetration rate by means of the percussion frequency and the percussion rate, which, in practice, are interdependent control parameters. In practice, the method can thus be regarded as an adjustment based on a single parameter. Moreover, in this method, a change does not affect the momentary value of the penetration rate, if the measurement of the penetration rate is disturbed in some way, and so the method is unreliable to a certain extent and cannot optimize the drill penetration with sufficient accuracy.
The object of the present invention is to provide a method for adjusting a drilling process, which optimizes the penetration rate as efficiently and reliably as possible irrespective of any disturbances affecting the measuring result. The method according to the invention is characterized in that the operating parameters are adjusted one at a time while the other operating parameters are kept substantially constant, that a continuous deviation is caused to occur symmetrically on both sides of the set value of the operating parameter to be adjusted, that a change caused by the deviation in the penetration rate is measured, that when the change caused by the deviation in the penetration rate is different on different sides of the set value, the set value is adjusted on the basis of the measurements in a direction in which the penetration rate increases, and that when a maximum value of the penetration rate is substantially achieved by adjusting one operating parameter, the operating parameter to be adjusted is changed. The equipment according to the invention is characterized in that the control devices comprise automatically operated adjusting means which deviate one operating parameter at a time from its set value, measure variation in the penetration rate, and shift the deviated set value in a direction in which the penetration rate increases, said adjusting means changing the operating parameter to be deviated when the set value being adjusted reaches a value substantially corresponding to a maximum penetration rate.
The basic idea of the invention is that the operating parameters are monitored one at a time by subjecting each parameter to a continuous, regular deviation occurring reciprocally and symmetrically, so that it can be seen on which side of the set value the penetration rate increases, and so the value of the parameter can be shifted towards a greater penetration rate on the basis of the deviation of the parameter. After one parameter is settled to its maximum value, a deviation is caused in the next parameter, and this is continued from one parameter to another in a predetermined circulating order so that the penetration rate of the drill bit is maximized, and the maximum value of the penetration rate can be achieved auto
REFERENCES:
patent: 3872932 (1975-03-01), Gosselin
patent: 3971449 (1976-07-01), Nylund et al.
patent: 4165789 (1979-08-01), Rogers
patent: 4195699 (1980-04-01), Rogers et al.
patent: 4793421 (1988-12-01), Jasinki
patent: 5129464 (1992-07-01), Richier
Melius Terry Lee
Tamrock Oy
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