Views: 0 Author: Site Editor Publish Time: 2025-09-12 Origin: Site
The guide sleeve is a key component of the rotary drilling rig's drill pipe system. Although it may seem insignificant, it has a significant impact on construction accuracy and equipment lifespan. For second-hand equipment, accurately judging the condition of the guide sleeve is an important step to avoid subsequent malfunctions.
1. Ensure verticality: The guide sleeve can restrain the swing of the drill pipe and ensure the verticality of the borehole. If the wear exceeds the standard, the borehole is prone to skew, which will affect the bearing capacity of the pile. When inspecting, you can observe whether there are obvious scratches or uneven wear on the inner wall.
2. Reduce wear: It can lower the direct friction between the drill pipe and the frame, thereby extending the service life of both. For second-hand equipment, the inner diameter of the guide sleeve needs to be measured. If it is more than 2mm larger than the standard value, it is recommended to replace it.
3. Dust-proof and dirt-proof: The sealing structure of the guide sleeve can prevent sand and mud from entering the interior of the drill pipe. Check whether the sealing ring is aged or cracked. If so, replace it in time to avoid accelerated wear caused by contaminants.
4. Buffering impact: When drilling encounters a hard layer, the guide sleeve can buffer the instantaneous impact force. For second-hand equipment, it is necessary to check whether the connection parts are loose and whether there are cracks in the welds to prevent breakage under force.
5. Positioning and guidance: During the extension and retraction of the drill pipe, the guide sleeve plays a precise positioning role. Check the installation gap between the guide sleeve and the frame. If it exceeds 0.5mm, it may cause the drill pipe to get stuck.
6. Hydraulic protection: Some guide sleeves are integrated with hydraulic pipeline seals. It is necessary to check whether there is any oil leakage at the interface. If there are oil stains and they keep reappearing after cleaning, it may be that the internal sealing parts have failed.
In conclusion, the core function of the guide sleeve is to "guide, protect and reduce friction". When inspecting second-hand equipment, a comprehensive judgment should be made by considering its appearance, size, sealing performance and connection strength. If there is severe wear, deformation or functional failure, timely repair and replacement can prevent greater losses.
