The installation of self-aligning roller bearings for crushers must follow strict operating procedures. The following are detailed steps and precautions:
1. Preparation before installation
Environment and tool inspection
Cleaning environment: Ensure that the installation area is free of dust and metal debris to avoid contaminating the bearing raceway.
Tool preparation: specialized tools (such as bearing heaters, micrometers, hydraulic nuts), measuring tools (vernier calipers), lubricants (lithium based grease or high-temperature composite grease).
.Bearing inspection: Check the bearing model and specifications, inspect the appearance for any damage (such as dents, burns, cracks), confirm that the retaining frame is intact, and measure the fitting dimensions (shaft diameter and bearing inner diameter).
.Component Cleaning
Thoroughly clean the bearing seat, journal, and related components, remove burrs, rust, and dirt, and wipe with a non fiber shedding cloth to avoid residual impurities.
. After cleaning, apply an appropriate amount of lubricating grease to the bearing raceway and cage, with the filling amount controlled at 1/3-1/2 of the internal space of the bearing.2. Selection of installation method
Choose the appropriate method based on the bearing size and interference fit:
1. Hot installation method (recommended)
Applicable scenarios: bearings with large interference fit or large size.
.Operating steps:
Heating method: oil bath heating (oil temperature 80-100 ℃, not exceeding 120 ℃) or induction heater (to avoid local overheating).
. Heating time: Adjust according to the bearing size (usually 15-30 minutes) to ensure that the bearing is fully expanded.Installation operation: Immediately after heating, use a copper rod to evenly apply force along the inner ring to avoid local force deformation. Quickly slide the bearing onto the shaft until the inner ring end face is in close contact with the shaft shoulder.
. Cooling fixation: After the bearing is cooled, tighten the locking nut or clamp plate to prevent shrinkage and clearance.2. Cold fitting method
Applicable scenarios: small-sized bearings or situations with small interference fit.
.Operation steps:
Tool assistance: Use a sleeve to press the end face of the bearing ring, tap the sleeve with a hammer, and evenly press the ring through the sleeve.
. Uniform force application: Ensure that the outer ring end face is tightly pressed against the outer shell shoulder end face, and the inner ring end face is tightly pressed against the shaft shoulder end face, without any gaps allowed.3. Hydraulic nut+oil injection method (high-precision scenario)
Applicable scenario: precise control of clearance or installation of tapered hole bearings is required.
.Operating steps:
Hydraulic nut installation: Screw the hydraulic nut onto the shaft, with the piston facing the bearing, and tighten by hand until it contacts the bearing and shaft.
.Oil injection propulsion: Inject oil into the hydraulic nut through the oil pump, slowly advance the bearing to the specified position (advance distance 2-2.4mm), and measure the change in clearance at the same time.
. Clearance adjustment: Based on the inner diameter size of the bearing, find the recommended residual clearance as the target value, repeatedly measure and adjust it to meet the standard.III. Inspection and Debugging After Installation
Rotation Flexibility Test
Manual Rotation: Gently rotate the bearing to confirm that there is no jamming or abnormal noise.
. Low speed idle test: Run at 10% -20% rated speed for 5-10 minutes to check for abnormal friction sounds or overheating.Key parameter detection
Axial positioning: Use a dial gauge to detect axial displacement and ensure that the positioning error is ≤ 0.02mm.
Radial clearance: Measure the original clearance using a micrometer method and adjust it to the standard value (e.g. C3 group clearance: 0.01-0.03mm).
. Vibration analysis: Use a vibration analyzer to detect the vibration value of the bearing seat (ISO 10816 standard: precision equipment vibration ≤ 1.8mm/s).Temperature rise monitoring
Temperature rise standard: Rolling bearing temperature rise ≤ 40 ℃ (ambient temperature 25 ℃), maximum temperature ≤ 80 ℃ (grease lubrication) or ≤ 95 ℃ (oil lubrication).
.Exception handling: If the temperature rise exceeds the standard, it is necessary to investigate issues such as insufficient lubrication, insufficient clearance, or uneven load.
.IV. Precautions
Do not directly strike: It is strictly forbidden to directly strike the bearing end face or roller with a hammer, which may cause damage to the raceway.
.Uniform force application: Use a copper rod or sleeve to strike alternately in the circumferential direction to avoid eccentricity caused by one-sided force.
.Anti rotation measures: During installation, use a pin or locating pin to fix the bearing to prevent it from rotating and misaligning with the shaft.
.Lubrication management: Select appropriate lubricating grease according to working conditions, use high-temperature composite lithium based grease in high-temperature environments, and regularly replace lubricating grease.
.Alignment adjustment: if the vibration exceeds the standard, it is necessary to readjust the shafting alignment, with the deviation controlled within 0.02mm (precision equipment).