Power plants – Pressure fluid source and motor – Methods of operation
Patent
1992-07-10
1994-02-22
Bertsch, Richard A.
Power plants
Pressure fluid source and motor
Methods of operation
60328, 60469, 91459, 91517, F16D 3100, F16D 3102
Patent
active
052876993
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an automatic vibration method and device for use in a hydraulic drilling machine with working parts consisting of a boom, an arm and a bucket, to apply adequate vibrations to the working parts and thereby achieve effective drilling with reduced resistance in various types of operations or even when the soil is changed.
BACKGROUND ART
Recent progress of the electronic technologies is remarkable. In the operation of hydraulic cylinders for the working parts of construction equipment, electronic hydraulic control has replaced mechanical control. In the structure shown in, for example, FIG. 5, a converter 52 converts the control input of a lever 51 operated by the operator into an electric signal, and inputs it to a controller 53. The controller 53 outputs an electric signal, proportional to the control input to a solenoid 55 or 56 of an electro-magnetic proportional valve 54. The electro-magnetic proportional valve 54 is opened proportionally to the electric signal, and an amount of oil proportional to the amount of the opening is supplied to a working part cylinder 61 via pipe 58 and either pipe 59 or pipe 60. The discharged oil from the working part cylinder 61 is returned to a tank 63 via a pipe 62.
However, the above-described conventional technique is performed manually, and therefore simple and minute repeated operations of the hydraulic drilling machine, such as pressure-shifting or sifting work, make the operator exhausted. Also, in pressure-shifting, sifting or drilling carried out while the bucket is vibrated in order to increase the drilling force, the electro-magnetic proportional valve 54 must be activated at a very high speed. However, in an electro-magnetic proportional valve having a large capacity, the force of inertia is large and there is a limit to increasing the switching speed. Consequently, it is impossible to apply adequate vibration to the bucket to cope with changes in the operation form or the soil.
In view of the aforementioned problems, an object of the present invention is to provide an automatic vibration method and device for a hydraulic drilling machine which are capable of effective drilling by reducing the resistance to coping with various types of operations or changes in the soil.
SUMMARY OF INVENTION
The present invention provides an automatic vibration method for a hydraulic drilling machine which comprises a working mode in which a vibration signal for at least one working part selected from a boom, an arm and a bucket is selected from a memory according to an operation form, a vibration mode in which an amplitude and a frequency of the selected vibration signal are selected from the memory according to the operation form, and an automatic vibration mode in which the vibration signal selected by the working mode and the vibration mode is outputted to an electronic hydraulic valve of an actuator of the working part. An operation signal corresponding to a control input of a working part lever is added to the vibration signal selected from the memory by the working mode and the vibration mode. The present invention also provides an automatic vibration device for a hydraulic drilling machine which comprises a working mode switch for selecting a vibration signal for at least one working part selected from a boom, an arm and a bucket from a memory according to an operation form, a vibration mode switch for selecting an amplitude and a frequency of the selected vibration signal from the memory according to the operation form, and an automatic vibration mode switch for outputting the vibration signal selected by the working mode and the vibration mode to an electronic hydraulic valve of an actuator of the working part. The automatic vibration device for the hydraulic drilling machine further includes an addition circuit for adding an operation signal corresponding to a control input of a working part lever to the vibration signal selected from the memory by the working mode switch and the vibration mode switch. In the abov
REFERENCES:
patent: 4689955 (1987-09-01), Lietzke
patent: 4708596 (1987-11-01), Palm et al.
patent: 4953723 (1990-09-01), Saotome
patent: 4969562 (1990-11-01), Saotome
patent: 5034892 (1991-07-01), Saotome
patent: 5048296 (1991-09-01), Sunamura et al.
Onoda Takumi
Takamura Fujitoshi
Bertsch Richard A.
Kabushiki Kaisha Komatsu Seisakusho
Nguyen Hoang
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