Oil pump driving-controlling system for multifunctional drilling machine

Abstract

The invention discloses an oil pump driving-controlling system for a multifunctional drilling machine, which is connected with a hydraulic system of the drilling machine and comprises a controller, a frequency changer, a variable frequency motor and an oil pump, wherein the controller sends a variable frequency adjusting signal to the frequency changer; and the frequency changer receives the variable frequency adjusting signal and adjusts the frequency of a working power supply of the variable frequency motor according to the variable frequency adjusting signal, so that the rotation speed of the variable frequency motor is changed and further the output flow rate of the oil pump which is connected with the variable frequency motor is changed. The oil pump driving-controlling system has the advantages that the multifunctional drilling machine has a soft starting-stopping mode by changing the oil pump driving mode, so that the impact current does not exist and the stepless speed regulation can be realized; and compared with the prior art, the oil pump driving-controlling system has the advantages that the working performance is obviously improved, the fault rate is low, the equipment operation cost is low, the energy consumption is small, and the energy-saving effect is obvious.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to an oil pump drive control system for a multifunctional drilling rig integrating a long screw drilling rig, a rotary drilling rig and a hydraulic vibratory hammer. Background technique [0002] At present, in the piling machinery industry, long auger drilling rigs, rotary drilling rigs, hydraulic vibratory hammers, etc. are commonly used several types of machines, most of which use ordinary three-phase AC motors to drive the power mechanism of the oil pump to provide power sources. However, because the power mechanism is a constant torque system, it has the characteristics of high power, large start and stop current impact, and correspondingly has the disadvantages of high energy consumption and high failure rate. [0003] In addition, since the speed regulation method of these models generally adopts stepped step-down, that is, a speed regulation method that uses a frequency ...

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Problems solved by technology

[0002] At present, in the piling machinery industry, long auger drilling rigs, rotary drilling rigs, hydraulic vibratory hammers, etc. are commonly used several types of machines, most of which use ordinary three-phase AC motors to drive the power mechanism of the oil pump to provide power sources. However, because the power mechanism is a constant torque system, it has the characteristics of large power, large start and stop current impact, and correspondingly has the disadvantages of high energy consumption and high failure rate.

[0003] In addition, since the speed regulation method of these models generally adopts stepped step-down, that is, a speed regulation method that uses a frequency converter to control an ordinary three-phase AC motor, but in reality, the ordinary three-phase AC motor speed regulation The speed range is limited to 30Hz-50Hz, so the torque output by the three-phase AC motor will also decrease when the speed is reduced, which is contrary to the requirement that the constant torque output is constant torque

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