Pressurization control method and pressurization control system for rotary drilling rig

Abstract

The invention discloses a pressurization control method and a pressurization control system for a rotary drilling rig. The pressurization control method for the rotary drilling rig includes the following steps that the pressure value of a rodless cavity of a left mast oil cylinder (11) and the pressure value of a rodless cavity of a right mast oil cylinder (16) are obtained respectively; a controller processes the pressure value of the rodless cavity of the left mast oil cylinder (11) and the pressure value of the rodless cavity of the right mast oil cylinder (16) to obtain the pressure difference value of the rodless cavity of the left mast oil cylinder (11) and the rodless cavity of the right mast oil cylinder (16); the pressure of a rodless cavity of a pressurization oil cylinder (20) is controlled according to the relationship of a preset pressure difference value and the pressure value of the rodless cavity of the pressurization oil cylinder (20). The pressurization control method for the rotary drilling rig can automatically adjust pressure applied to a power head by the pressurization oil cylinder, reduces the probability of drilling stem unbalance loading and mast unbalance loading caused when a drill bit impacts a load and a load is unbalance, lowers vibration frequency, and operating mechanism damage caused by factors such as human judging errors or operating delay and personal and equipment safety accidents caused due to the facts that damaged parts fall from a high altitude are avoided.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a pressurization control method and a pressurization control system of a rotary drilling rig. Background technique [0002] Rotary drilling rig is currently the most widely used pile foundation equipment, please refer to figure 1 , the working process is that the drill bit 4 descends with the drill rod 1 to the working position at the bottom of the pile hole 2, the hydraulic motor drives the drill rod 1 to rotate, the drill rod 1 is connected with the drill bit 4 through the connecting square head, and the drill rod 1 drives the drill teeth of the drill bit 4 5 cutting and drilling operations. In drilling conditions, the pressurized oil cylinder applies a certain amount of downward pressure to the power head, and the piston rod of the pressurized oil cylinder stretches out to drive the power head, drill pipe, and drill bit to move downward. [0003] The drill toot...

AI Technical Summary

Problems solved by technology

The eccentric load of the drill bit 4 will generate vibration, and the drill bucket 3, drill pipe 1, power head and follower frame will also bear the corresponding eccentric load and corresponding vibration, causing damage to the corresponding structural parts

The greater the eccentric load, the higher the vibration frequency and the greater the impact load on the structural parts. In severe cases, the square head connecting the drill bucket 3 and the drill pipe 1 may be welded or even broken, causing the drill bit to be "buried" or Falling from high altitude, at the same time, lead to open welding and deformation of the mast guide rail, cracking and deformation of the U-shaped groove of the follower frame, etc., and the main working mechanism cannot work normally

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