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76*54-6201
SOK
Product description:
SOK Escalator Step Roller76*54*6201，welcome to contact us now.
1. Escalator Tachometer Roller
8. Lead time: 3days
Hefei SOK International CO., LTD is a professional elevator parts and escalator parts manufacturer in China.
SOK’s Products:We are supplying all kinds of elevator and escalator parts, such as escalator step roller, escalator step, escalator step chain, elevator PCB board, elevator rope, elevator inverter,etc.
SOK’s guarantee:We are offering 12month gurantee for our spare parts here and garantee its 0rigin and all the parts will be testing before delivery to make sure its working conditions, if any parts in poor quality, we will take it our and exchange it at own cost here!
SOK’s Payment term: T/T or Alibaba,Western Union (agree RMB)
SOK’s Quality control: All Parts to be tested here for delivery
FAQ
Q: What is the primary function of the escalator governor sheave?
A: The governor sheave is the heart of the overspeed governor system. Its primary function is to rotate at a speed directly proportional to the escalator's step speed. If the escalator accelerates beyond its safe limit (typically 25-40% over rated speed), the centrifugal force within the sheave assembly activates a mechanical trip, cutting power and applying the main brake to safely stop the escalator.
Q: What are the common signs of a worn or failing governor sheave?
A: Common symptoms include:
•Escalator Tripping Unnecessarily: The most common sign. The governor falsely triggers a shutdown without an actual overspeed condition, often due to worn bushings or bearings causing vibration.
•Visible Wear on the Rope Groove: Inspect the groove that contacts the governor rope. Look for sharp edges, deep gouges, or asymmetric wear that can hinder smooth operation.
•Unusual Noises: Rattling or grinding sounds from the governor assembly may indicate loose or damaged components within the sheave.
•Inconsistent Operation: The escalator might exhibit intermittent speed fluctuations due to inconsistent engagement between the sheave and the governor rope.
Q: What are the root causes of step roller wear and how can early signs be identified through routine inspection?
A: The primary causes of step roller wear are:
1.Normal Fatigue: The constant load and cyclic stress on the roller flange and tread lead to material fatigue over time.
2.Misalignment: Improper alignment between the step rollers and the track (comb guide) causes uneven pressure, resulting in accelerated and asymmetric wear, often seen as a sharp, angled wear pattern on the flange.
3.Contamination: Dust, grit, and other abrasive particles act as lapping agents, grinding down the roller surface and increasing friction.
4.Lubrication Failure: For non-sealed types, lack of proper lubrication on the roller axle (king pin) increases rolling resistance, causing the roller to drag rather than roll smoothly.
Early signs identifiable during inspection include:
•Visible Flange Reduction: Compare the roller's flange height to a new one. A significant reduction indicates advanced wear.
•Flat Spots or Grooves: Look for uneven wear patterns on the tread or flange surface.
•Unusual Noise: A rumbling, grinding, or clicking sound from the step chain, especially at the curved sections, often points to worn rollers.
•Vibration: Excessive vibration felt in the step tread can be transmitted from damaged or out-of-round rollers.
Q: What are the key considerations when choosing between OEM and compatible replacement step rollers?
A: This decision critically impacts safety, performance, and the total cost of ownership
OEM (Original Equipment Manufacturer) Rollers:
•Pros: Guaranteed dimensional and material compatibility with your specific escalator model. They undergo rigorous testing to meet the original performance standards for load capacity, noise, vibration, and fire resistance (UL94 HB/V0). They are often covered by the manufacturer's warranty.
•Cons: Higher initial purchase cost.
•
Compatible (Aftermarket) Rollers:
•Pros: Lower upfront cost and wider availability from various distributors.
•Cons: Quality and consistency can vary dramatically. Inferior polymers or bearings may wear faster, increasing downtime and frequency of replacement. Failure to meet original specifications for hardness, impact resistance, or flame retardancy can pose safety risks and affect ride quality. Use of non-OEM parts may also void existing warranties on the step chain or other related assemblies.
Recommendation: For critical safety components like step rollers, investing in OEM parts is strongly recommended to ensure long-term reliability, passenger safety, and compliance with safety codes (e.g., ASME A17.1/EN115). If considering compatible parts, select them only from highly reputable suppliers that provide full material certifications and test reports matching OEM specs.
Q: What are the best practices for step roller lubrication? Can over-lubrication cause issues?
A: The vast majority of modern escalator step rollers are equipped with maintenance-free, sealed, and lubricated-for-life bearings that do not require routine re-lubrication. The foremost best practice is to always consult and follow the OEM's maintenance manual.
For older models or specific rollers that require lubrication:
•
Best Practice: Use only the grease type and quantity specified by the manufacturer. Lubrication should be performed during scheduled maintenance intervals, applied precisely to the roller's axle (king pin) bearing point. The objective is to create a thin film to minimize friction, not to overpack the assembly.
•
Problems with Over-Lubrication:
1.Attracts Contamination: Excess grease captures dust and abrasive particles, creating a viscous grinding compound that drastically accelerates roller and track wear.
2.Track and Guide Contamination: Grease can migrate out and coat the step chain tracks and guide rails, leading to slippage, improper roller guidance, and potential operational issues.
3.Chemical Degradation: Some grease formulations can chemically break down certain plastic roller cores or rubber treads, causing swelling, cracking, or premature failure.
4.Safety and Maintenance Hazard: Grease on the steps, skirting, or bottom deck creates a slip hazard for passengers and technicians, and attracts more dirt, increasing cleaning efforts.
Product description:
SOK Escalator Step Roller76*54*6201，welcome to contact us now.
1. Escalator Tachometer Roller
8. Lead time: 3days
Hefei SOK International CO., LTD is a professional elevator parts and escalator parts manufacturer in China.
SOK’s Products:We are supplying all kinds of elevator and escalator parts, such as escalator step roller, escalator step, escalator step chain, elevator PCB board, elevator rope, elevator inverter,etc.
SOK’s guarantee:We are offering 12month gurantee for our spare parts here and garantee its 0rigin and all the parts will be testing before delivery to make sure its working conditions, if any parts in poor quality, we will take it our and exchange it at own cost here!
SOK’s Payment term: T/T or Alibaba,Western Union (agree RMB)
SOK’s Quality control: All Parts to be tested here for delivery
FAQ
Q: What is the primary function of the escalator governor sheave?
A: The governor sheave is the heart of the overspeed governor system. Its primary function is to rotate at a speed directly proportional to the escalator's step speed. If the escalator accelerates beyond its safe limit (typically 25-40% over rated speed), the centrifugal force within the sheave assembly activates a mechanical trip, cutting power and applying the main brake to safely stop the escalator.
Q: What are the common signs of a worn or failing governor sheave?
A: Common symptoms include:
•Escalator Tripping Unnecessarily: The most common sign. The governor falsely triggers a shutdown without an actual overspeed condition, often due to worn bushings or bearings causing vibration.
•Visible Wear on the Rope Groove: Inspect the groove that contacts the governor rope. Look for sharp edges, deep gouges, or asymmetric wear that can hinder smooth operation.
•Unusual Noises: Rattling or grinding sounds from the governor assembly may indicate loose or damaged components within the sheave.
•Inconsistent Operation: The escalator might exhibit intermittent speed fluctuations due to inconsistent engagement between the sheave and the governor rope.
Q: What are the root causes of step roller wear and how can early signs be identified through routine inspection?
A: The primary causes of step roller wear are:
1.Normal Fatigue: The constant load and cyclic stress on the roller flange and tread lead to material fatigue over time.
2.Misalignment: Improper alignment between the step rollers and the track (comb guide) causes uneven pressure, resulting in accelerated and asymmetric wear, often seen as a sharp, angled wear pattern on the flange.
3.Contamination: Dust, grit, and other abrasive particles act as lapping agents, grinding down the roller surface and increasing friction.
4.Lubrication Failure: For non-sealed types, lack of proper lubrication on the roller axle (king pin) increases rolling resistance, causing the roller to drag rather than roll smoothly.
Early signs identifiable during inspection include:
•Visible Flange Reduction: Compare the roller's flange height to a new one. A significant reduction indicates advanced wear.
•Flat Spots or Grooves: Look for uneven wear patterns on the tread or flange surface.
•Unusual Noise: A rumbling, grinding, or clicking sound from the step chain, especially at the curved sections, often points to worn rollers.
•Vibration: Excessive vibration felt in the step tread can be transmitted from damaged or out-of-round rollers.
Q: What are the key considerations when choosing between OEM and compatible replacement step rollers?
A: This decision critically impacts safety, performance, and the total cost of ownership
OEM (Original Equipment Manufacturer) Rollers:
•Pros: Guaranteed dimensional and material compatibility with your specific escalator model. They undergo rigorous testing to meet the original performance standards for load capacity, noise, vibration, and fire resistance (UL94 HB/V0). They are often covered by the manufacturer's warranty.
•Cons: Higher initial purchase cost.
•
Compatible (Aftermarket) Rollers:
•Pros: Lower upfront cost and wider availability from various distributors.
•Cons: Quality and consistency can vary dramatically. Inferior polymers or bearings may wear faster, increasing downtime and frequency of replacement. Failure to meet original specifications for hardness, impact resistance, or flame retardancy can pose safety risks and affect ride quality. Use of non-OEM parts may also void existing warranties on the step chain or other related assemblies.
Recommendation: For critical safety components like step rollers, investing in OEM parts is strongly recommended to ensure long-term reliability, passenger safety, and compliance with safety codes (e.g., ASME A17.1/EN115). If considering compatible parts, select them only from highly reputable suppliers that provide full material certifications and test reports matching OEM specs.
Q: What are the best practices for step roller lubrication? Can over-lubrication cause issues?
A: The vast majority of modern escalator step rollers are equipped with maintenance-free, sealed, and lubricated-for-life bearings that do not require routine re-lubrication. The foremost best practice is to always consult and follow the OEM's maintenance manual.
For older models or specific rollers that require lubrication:
•
Best Practice: Use only the grease type and quantity specified by the manufacturer. Lubrication should be performed during scheduled maintenance intervals, applied precisely to the roller's axle (king pin) bearing point. The objective is to create a thin film to minimize friction, not to overpack the assembly.
•
Problems with Over-Lubrication:
1.Attracts Contamination: Excess grease captures dust and abrasive particles, creating a viscous grinding compound that drastically accelerates roller and track wear.
2.Track and Guide Contamination: Grease can migrate out and coat the step chain tracks and guide rails, leading to slippage, improper roller guidance, and potential operational issues.
3.Chemical Degradation: Some grease formulations can chemically break down certain plastic roller cores or rubber treads, causing swelling, cracking, or premature failure.
4.Safety and Maintenance Hazard: Grease on the steps, skirting, or bottom deck creates a slip hazard for passengers and technicians, and attracts more dirt, increasing cleaning efforts.
