Rotary drilling rig and main winch placing down speed control device thereof

Abstract

The invention provides a rotary drilling rig and a main winch placing down speed control device thereof, wherein the main winch placing down speed control device comprises a sensor, a controller and a reverse valve device, the sensor is used for sensing the relative distance between a drill rod and a power head buffer device in real time and sending triggering signals when the relative distance equals to the preset distance, the controller is used for sending voltage signals to the reverse valve device after receiving the triggering signals, an oil supply opening of a main pump negative feedback opening is connected with the main pump negative feedback opening through the reverse valve device, and the oil supply opening supplies oil to the main pump negative feedback opening when the reverse valve device receives the voltage signals and the main winch is in the placing down state. The negative feedback pressure of a main pump can be controlled, and the discharge capacity of the main pump is changed, so the main winch placing down speed can be effectively decelerated in the drill rod placing down process, the severe collision between the drill rod and a power head is avoided, the service life of the power head is prolonged, and the whole machine reliability is improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a rotary drilling rig and a main winch lowering speed control device thereof. Background technique [0002] At present, the main winch control scheme of rotary drilling rigs is equipped with functions such as lifting, lowering and floating; when the main winch is lowered, a multi-stage buffer device is used to avoid severe collisions between the drill pipe and the power head, but this method still exists Hidden dangers of failure can easily lead to problems such as oil leakage and damage to the motor reducer, especially when the operator is new to the machine, the failure rate is greatly increased. Contents of the invention [0003] In order to overcome the above-mentioned defects and deficiencies of the prior art, the first object of the present invention is to provide an effective speed control device for the main winch of the rotary drilling rig, including: a sensor, a c...

AI Technical Summary

Problems solved by technology

[0002] At present, the main winch control scheme of rotary drilling rigs is equipped with functions such as lifting, lowering and floating; when the main winch is lowered, a multi-stage buffer device is used to avoid severe collisions between the drill pipe and the power head, but this method still exists Hidden dangers of failures are likely to cause problems such as oil leakage, motor reducer damage, etc., especially when new operators operate, the failure rate is greatly increased

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