A-Frame Oil Tube Stabbing Board & Sheave Assembly Components

1

Sheave

φ1270

101.51.20.02

QT600-3 Ductile Iron (Rope groove surface quenching HRC45-50)

1. Uneven wear of the rope groove caused by long-term friction with the steel wire rope; 2. Fatigue cracking of the sheave body caused by cyclic load; 3. Corrosion of the outer surface caused by drilling fluid and marine salt spray; 4. Local damage caused by impact from falling objects or irregular workpieces.

1. Regularly inspect the rope groove wear depth; when the wear depth exceeds 10% of the steel wire rope diameter or the rope groove becomes elliptical, replace the sheave immediately; 2. Conduct ultrasonic testing (UT) on the sheave body every 6 months to detect internal fatigue cracks; 3. Apply epoxy zinc-rich anti-corrosion paint to the outer surface annually, and clean the rope groove regularly to remove debris; 4. Install protective guards around the sheave to prevent impact from falling objects; 5. Ensure the steel wire rope runs along the center of the rope groove to avoid eccentric wear.

2

End shield

Customized for sheave assembly

101.51.20.01

HT250 Gray Cast Iron

1. Crack caused by impact during transportation or installation; 2. Corrosion caused by humid environment and drilling fluid erosion; 3. Deformation caused by uneven tightening of mounting bolts; 4. Wear of the sealing surface caused by long-term friction with the dust ring.

1. Use shock-absorbing packaging during transportation, and avoid knocking the end shield during installation; 2. Apply anti-rust paint to the surface, and seal the connection with the bearing seat with sealant to prevent drilling fluid intrusion; 3. Use a torque wrench to tighten the mounting bolts uniformly according to the specified torque; 4. Regularly inspect the sealing surface for wear, and repair or replace the end shield if the sealing performance is compromised; 5. Replace the end shield immediately if there is any crack.

3

Bearing seat

Customized for sheave assembly

101.51.20.05

42CrMo Alloy Steel (Forged & Heat Treated)

1. Wear of the bearing mounting hole caused by long-term rotation of the bearing; 2. Fatigue deformation caused by continuous radial load; 3. Corrosion caused by lubricating oil deterioration and external moisture; 4. Stress concentration at the bolt hole caused by improper installation.

1. Ensure the bearing is properly installed, and the fit clearance between the bearing and the mounting hole is within the range of 0.02-0.05mm; 2. Regularly check the bearing seat for deformation, and conduct straightness testing every 6 months; 3. Replace the lubricating oil regularly to ensure good lubrication and anti-corrosion performance; 4. Chamfer the bolt hole edges to reduce stress concentration; 5. Replace the bearing seat if the mounting hole wear exceeds the limit or there is fatigue cracking.

4

Shaft

Customized for sheave assembly

101.51.20.06

40CrNiMoA Alloy Steel

1. Fatigue wear of the journal caused by long-term cooperation with the bearing; 2. Bending deformation caused by eccentric load or impact; 3. Corrosion caused by lubricating oil contamination; 4. Stress concentration at the shaft shoulder leading to cracking.

1. Grind the journal surface regularly to maintain surface roughness Ra≤0.8μm; 2. Ensure the shaft is properly aligned during installation to avoid eccentric load; 3. Filter the lubricating oil regularly to remove impurities, and replace the oil if it is contaminated; 4. Conduct magnetic particle testing (MPT) on the shaft shoulder and keyway every 4 months to detect surface cracks; 5. Avoid hitting the shaft with heavy objects during disassembly and assembly, and use special lifting tools.

5

Spacer

Customized for sheave assembly

101.51.20.032

45# Carbon Steel (Precision Machined)

1. Wear caused by axial pressure between bearings; 2. Deformation caused by excessive axial preload; 3. Corrosion caused by humid environment; 4. Scratches on the end face caused by improper installation.

1. Select spacers of the correct thickness to ensure the appropriate axial preload of the bearing; 2. Check the flatness of the spacer end face regularly, and replace the spacer if the flatness error exceeds 0.01mm; 3. Apply anti-rust oil to the spacer surface before installation; 4. Use clean tools during installation to avoid scratches on the end face; 5. Ensure the spacer is installed in the correct position to avoid misalignment.

6

Dust ring

Customized for sheave assembly

101.51.20.04

NBR (Nitrile Butadiene Rubber) Shore A 70-75

1. Aging, hardening, and cracking caused by long-term exposure to high temperature and lubricating oil; 2. Wear caused by friction with the rotating shaft; 3. Damage caused by drilling fluid and chemical corrosion; 4. Deformation caused by improper installation.

1. Replace the dust ring every 6 months or when signs of aging (hardening, cracking) appear; 2. Ensure the dust ring is properly installed with a tight fit between the inner diameter and the shaft, and the outer diameter and the end shield; 3. Avoid contact with strong acids, alkalis, and other chemical media; 4. Check the dust ring for damage during each maintenance, and clean the surface of the shaft and end shield before installing a new dust ring; 5. Store unused dust rings in a cool, dry place away from direct sunlight and oil.

7

Bearing

φ260Xφ360X134 GB299-86 (2097952K)

-

GCr15SiMn Bearing Steel

1. Wear of the rolling elements and raceway caused by insufficient lubrication; 2. Overheating and adhesion caused by high load and high speed; 3. Corrosion caused by water or impurities entering the bearing; 4. Fatigue failure caused by long-term cyclic load.

1. Use high-quality lithium-based grease that is compatible with the working temperature ( -20℃ to 120℃) and load; inject grease every 25 working hours; 2. Monitor the bearing temperature during operation; if the temperature exceeds 80℃, stop the machine immediately for inspection; 3. Ensure the sealing performance of the dust ring and end shield to prevent water and impurities from entering; 4. Conduct vibration testing regularly to detect abnormal bearing operation; 5. Replace the bearing when the vibration amplitude exceeds the limit or fatigue spalling occurs on the raceway.

1

Bolt M20X45

GB/T32.1-1988 (M20X45)

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40Cr Alloy Steel

1. Thread wear caused by repeated assembly and disassembly; 2. Fatigue breakage of the bolt shank caused by long-term vibration; 3. Corrosion caused by drilling fluid and marine salt spray; 4. Damage caused by over-tightening with improper tools.

1. Use a torque wrench to tighten the bolt according to the specified torque (180-220N·m for M20 bolts); avoid over-tightening; 2. Apply anti-seize agent to the thread before installation to reduce wear during disassembly and assembly; 3. Apply anti-corrosion paint to the bolt surface after installation; 4. Use socket wrenches that match the bolt head size to avoid damaging the bolt edges; 5. Conduct magnetic particle testing on the bolt shank every 6 months, and replace the bolt if there are cracks.

2

Eye bolt in head

M20X45 GB32.1-86 (M20X45-8.8)

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40Cr Alloy Steel (8.8 Grade)

1. Bending deformation of the eye caused by lateral load; 2. Thread wear caused by long-term vibration; 3. Corrosion of the eye and thread caused by humid environment; 4. Fatigue cracking at the junction of the eye and the shank.

1. Ensure the load is applied along the axis of the eye bolt; avoid lateral load (lateral load capacity is 1/3 of the axial load); 2. Use a torque wrench to control the tightening torque; 3. Regularly inspect the eye for deformation and the junction for cracks; 4. Apply anti-rust oil to the thread and eye surface; 5. Replace the eye bolt if the eye is deformed or cracks are found.

3

Washer 20

GB/T93-1987 (20) / GB93-87 (20)

-

65Mn Spring Steel

1. Deformation and loss of elasticity caused by excessive clamping force; 2. Corrosion caused by humid environment; 3. Wear of the contact surface caused by long-term vibration; 4. Fatigue failure caused by cyclic load.

1. Ensure the washer size matches the bolt specification (inner diameter φ21, outer diameter φ40); 2. Install the washer correctly with the curved side facing the nut to enhance anti-loosening performance; 3. Replace the washer if it is deformed or loses elasticity; 4. Apply anti-rust paint to the washer surface in corrosive environments; 5. Do not reuse washers that have been severely deformed.

4

Plug

Customized

101.51.20.07

45# Carbon Steel

1. Thread wear caused by repeated installation and removal; 2. Corrosion caused by drilling fluid and moisture entering the thread; 3. Deformation caused by improper installation with excessive force; 4. Sealing failure caused by wear of the sealing surface.

1. Apply thread sealant before installation to enhance sealing and anti-loosening performance; 2. Use a socket wrench to install the plug, avoiding excessive force; 3. Regularly check the plug for looseness and leakage; 4. Clean the thread and apply anti-rust oil when removing the plug for maintenance; 5. Replace the plug if the thread is worn or the sealing surface is damaged.

5

Plug

Customized

101.51.20.071

45# Carbon Steel

1. Same as Plug 101.51.20.07; 2. Sealing failure caused by improper matching with the mounting hole.

1. Same as Plug 101.51.20.07; 2. Check the fit between the plug and the mounting hole before installation; ensure no burrs on the hole wall; 3. Use a feeler gauge to check the sealing gap after installation, which should be less than 0.02mm.

1

Oil cup

M10X1 GB1152-89 (M10X1)

-

H62 Brass

1. Blockage of the oil injection channel caused by dust and impurities; 2. Thread wear caused by repeated rotation of the oil cup cap; 3. Corrosion of the brass body caused by humid environment; 4. Damage to the oil cup cap caused by impact.

1. Clean the oil injection channel with compressed air before adding lubricating oil; 2. Rotate the oil cup cap gently during use to avoid thread wear; 3. Apply anti-rust oil to the thread and outer surface; 4. Install a protective cover on the oil cup in harsh environments to prevent impact and dust; 5. Replace the oil cup immediately if the oil injection channel is blocked and cannot be cleared or the cap is damaged.

2

Oil cup

M10X1 GB 1152-79 (M10X1)

-

H62 Brass

1. Same as Oil cup GB1152-89 (M10X1); 2. Sealing failure of the oil cup cap caused by aging of the sealing gasket.

1. Same as Oil cup GB1152-89 (M10X1); 2. Regularly check the sealing gasket of the oil cup cap; replace the gasket if it is aging or damaged; 3. Apply a small amount of grease to the gasket to enhance sealing performance.

3

Iron wire

φ2 GB343-82 (φ2) A.R.

-

Q195 Low Carbon Steel

1. Fatigue breakage caused by long-term vibration; 2. Corrosion caused by humid environment and drilling fluid erosion; 3. Wear at the bending part caused by repeated bending; 4. Tensile breakage caused by excessive force during installation.

1. Use the "figure-eight" locking method when fixing fasteners to enhance anti-loosening performance; 2. Avoid excessive bending of the iron wire (no more than 3 times at the same position); 3. Apply anti-rust paint to the iron wire after installation; 4. Select the appropriate length of iron wire, and do not leave excess ends that may cause scratches; 5. Check the iron wire for looseness and corrosion regularly, and re-lock or replace it if necessary.

4

Iron wire

φ2 GB343-82 (φ2X1200)

-

Q195 Low Carbon Steel

1. Same as Iron wire φ2 GB343-82 (φ2) A.R.; 2. Wear caused by friction with other components due to excessive length.

1. Same as Iron wire φ2 GB343-82 (φ2) A.R.; 2. Cut the iron wire to the exact required length before use to avoid contact friction with other moving components; 3. Fix the excess ends (if any) to the static components to prevent interference with moving parts.