Rotary drilling rig and hoisting mechanism, controller and control method thereof

Abstract

The invention discloses a hoisting control method for a hoisting mechanism. The hoisting control method includes: applying hydraulic oil to a reversing valve (3) through a pilot pump (1) so as to enable the reversing valve to be located at a hoisting operation position, and applying hydraulic oil to a hoisting oil inlet of a hydraulic motor (5) by a main pump through the reversing valve; and detecting first oil pressure on an inlet oil-way of the hydraulic motor, and opening a brake to allow operation of the hydraulic motor when the first oil pressure equals to a preset oil pressure, wherein the hydraulic motor is static or rotates towards the hoisting direction when the value of the first oil pressure reaches the preset oil pressure value. The invention further provides a controller, the hoisting mechanism and a rotary drilling rig. Reverse rotation, towards the hoisting direction, of the hydraulic motor can be avoided when the brake is opened, and accordingly load gliding during secondary hoisting can be avoided, operability of the hoisting mechanism is improved, operation efficiency is improved, accidents are prevented effectively, and safety and economy are improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a lifting control method of a lifting mechanism, a controller for realizing the control method, a lifting mechanism including the controller, and a rotary drilling rig. Background technique [0002] The secondary lifting and sliding phenomenon of lifting mechanisms such as hydraulic lifting or hoisting mechanisms refers to the phenomenon that the heavy object suspended in the air slides to the opposite direction when it is slightly lifted again. This phenomenon is especially serious during heavy loads. [0003] Take the drill pipe lifting mechanism of a crane as an example. figure 1 It is a typical lifting control system commonly used in existing hydraulic truck cranes. Among them, the pilot pump 1 is connected to the two control ports of the selector valve 3 through the control selector valve 2, and the oil pressure provided by the pilot pump 1 is applied to the selector v...

AI Technical Summary

Problems solved by technology

[0004] The problem with the above system is that no matter whether the heavy object is lifted or lowered, the brake 6 needs to be released first. In order to avoid wasting power, the release pressure of the brake 6 is very low.

[0005] For example, cranes for various installation purposes, especially for precision and valuable equipment, high-pressure containers, missiles and other military products, as well as cranes for the installation and lifting of other flammable, explosive and vulnerable products, this uncontrolled sliding phenomenon is Extremely harmful, not only affect the maneuverability of the machine, reduce operating efficiency, but also may cause serious accidents and economic losses

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