Description
Elevator door knife roller use for DO300 Brief Introduction
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Product Name |
Elevator door knife roller |
| Model Number | DO300 |
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Quality
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Original.Brand New
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Payment
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T/T. Paypal. Western Union
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Delivery
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3-5 Working Days
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Packaging
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Packed by carton
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Elevator Door Knife Roller for DO300: Smooth Rolling Core from Nanjing Zhuye Elevatorparts
Elevator Door Knife Roller specifically designed for DO300 door knife models is a critical guiding and rolling component for elevator door systems. It is tailored to match the structural parameters and operational requirements of DO300 door knives, which are widely used in commercial and residential elevators. Installed on the DO300 door knife assembly, this roller rolls along the elevator door lock rail, enabling the door knife to accurately clamp and release the door lock during the elevator door opening and closing process. It reduces friction between the door knife and the lock rail, ensuring smooth, quiet, and efficient operation of the elevator doors while preventing jamming or deviation. As an essential replacement part for DO300 door knife systems, it plays a vital role in maintaining the stability and safety of elevator door operation. Exclusively supplied by Nanjing Zhuye Elevatorparts, a professional provider of high-quality elevator mechanical components, the Elevator Door Knife Roller for DO300 fully complies with international elevator safety standards (EN 81-20, GB 7588) and mechanical component technical specifications. Manufactured with premium materials and precision machining technology, it features excellent wear resistance, high load-bearing capacity, and stable performance in harsh shaft environments, earning recognition from global elevator maintenance teams and door knife manufacturers.
Nanjing Zhuye Elevatorparts adheres to the core philosophy of “Smooth Rolling, Durable Operation” and implements rigorous quality control for the elevator door knife roller compatible with DO300 door knives. Each unit undergoes multi-stage pre-delivery inspections, including dimensional accuracy testing, wear resistance verification, rotation flexibility detection, and load-bearing capacity evaluation. The DO300 door knife roller adopts advanced materials and technologies: the roller body is made of high-strength polyurethane (PU) or nylon, with a Shore hardness of 85–90A, achieving optimal wear resistance and shock absorption to reduce operational noise to ≤ 55dB; the built-in bearing (model 6202 or 6203, customized for DO300) is made of high-carbon chromium steel with a double-sealed structure, effectively preventing dust and lubricating oil leakage and ensuring smooth rotation for over 1 million cycles; the inner race is precision-machined to fit perfectly with the DO300 door knife shaft, avoiding loose rotation; the surface of the roller is smooth and burr-free, preventing scratches on the door lock rail. The standardized design tailored for DO300 door knives enables seamless installation and replacement without additional modifications.
Step-by-Step Usage Guide for Elevator Door Knife Roller (DO300)
To maximize the service life, rolling performance, and operational stability of the Elevator Door Knife Roller for DO300, strictly follow the professional guidelines provided by Nanjing Zhuye Elevatorparts for selection, installation, and maintenance:
1. Professional Selection & Pre-Installation Preparation
Installation must be performed by certified elevator technicians. Prior to selection, confirm that the elevator door knife model is DO300 and consult Nanjing Zhuye Elevatorparts’ technical team to ensure the roller’s diameter, width, and bearing model match the DO300 door knife. Preparation steps: Cut off the elevator’s main power supply and lock the power switch; place a “Maintenance in Progress” warning sign at the elevator entrance; fix the elevator car door in the fully open position with a mechanical support; disassemble the DO300 door knife cover to expose the roller installation position, and clean the roller shaft, lock rail, and surrounding area to remove dust, oil stains, and debris.
2. Correct Installation & Precision Adjustment
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Old Roller Removal: Use a snap ring plier to remove the snap ring fixing the old roller on the DO300 door knife shaft, then take out the old roller. Check the door knife shaft for wear, corrosion, or deformation; if there is damage, polish or replace the shaft before installing the new roller.
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New Roller Installation: Take the DO300-specific door knife roller from Nanjing Zhuye Elevatorparts, apply a thin layer of high-temperature lubricating grease (recommended by the brand) to the door knife shaft and the roller’s inner bearing. Align the roller with the shaft and slide it into place, then install the snap ring to fix the roller securely (ensure the snap ring is fully clamped into the shaft groove to avoid roller displacement).
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Installation Adjustment: After installing the roller, manually simulate the DO300 door knife’s clamping and release process to check if the roller rolls smoothly without jamming. Adjust the position of the door knife if necessary to ensure the roller is in full contact with the lock rail and the rolling path is consistent. Reinstall the door knife cover after adjustment.
3. Post-Installation Testing & Daily Maintenance
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Function Testing: Restore the elevator’s power supply and switch to inspection mode. Operate the elevator door to open and close automatically (≥ 15 times) to verify that the doors open and close smoothly, the door knife clamps and releases the lock reliably, and there is no abnormal noise or jitter. Check the door opening and closing speed to ensure it meets the design requirements.
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Daily Inspection: Maintenance personnel should check the roller during daily patrols: Observe the roller’s surface for wear, cracks, or deformation through the door knife’s inspection hole; check if the snap ring is loose; listen for abnormal noise when the door operates, which may indicate roller wear or bearing failure; check the lock rail for scratches caused by the roller.
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Regular Maintenance: Every 3 months, clean the roller surface and lock rail with a soft brush to remove dust and debris; add an appropriate amount of lubricating grease to the roller’s bearing. Every 6 months, measure the roller’s outer diameter wear (limit wear ≤ 2mm); if exceeding the limit, replace the roller in time. For elevators in high-traffic or harsh environments (e.g., coastal areas with high humidity), shorten the maintenance interval to 1 month.
Recommended Replacement Cycle for Elevator Door Knife Roller (DO300)
As a core mechanical component enduring long-term friction with the lock rail, repeated rolling, mechanical vibration, and environmental erosion (humidity, dust, temperature changes), the elevator door knife roller for DO300 has a specified service life. Timely replacement is crucial to avoiding faults such as excessive roller wear, bearing jamming, or roller deformation—issues that may lead to door knife jamming, slow door operation, or even door failure, affecting passenger travel safety and efficiency.
1. Standard Replacement Cycle
Under normal operating conditions (elevator daily operation time 12–24 hours, daily door opening/closing cycles ≥ 2000, shaft environment temperature -20℃ to 70℃, humidity 10%–95%), the recommended replacement cycle for the DO300 door knife roller is1.5–2.5 years. This cycle is determined based on Nanjing Zhuye Elevatorparts’ long-term field operation data, wear tests, and global user feedback on elevator door components.
2. Adjustments for Special Scenarios
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High-Traffic & Harsh Environments: For elevators in high-traffic locations (e.g., large shopping malls, airports) with daily door cycles ≥ 3500, or in harsh environments (e.g., high-humidity coastal areas, high-dust industrial sites), the replacement cycle is shortened to8–12 months. Frequent rolling accelerates roller surface wear and bearing aging, while harsh environments cause material degradation and corrosion.
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Low-Frequency Use & Stable Environments: For elevators with low usage frequency (e.g., villa elevators, small office buildings with daily operation time < 8 hours) and stable shaft environments (constant temperature and humidity), the replacement cycle can be extended to 2.5–3 years—only after Nanjing Zhuye Elevatorparts’ technicians inspect and confirm that the roller’s wear degree, bearing performance, and structural integrity meet factory standards.
3. Immediate Replacement Conditions
Replace the DO300 door knife roller immediately if any of the following issues occur, regardless of its service life:
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The roller surface wear exceeds 2mm, or there are cracks, chips, or obvious deformation, leading to uneven door operation or increased noise.
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The bearing is stuck, noisy, or has poor rotation flexibility, causing the door to open and close unsmoothly or jam.
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The roller’s inner race is loose or worn, leading to shaking during operation and affecting the door knife’s clamping accuracy.
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Professional testing confirms that the roller’s load-bearing capacity is reduced by more than 30%, failing to support the door knife’s operation safely.
In conclusion, the Elevator Door Knife Roller for DO300 from Nanjing Zhuye Elevatorparts is a high-quality, model-specific component tailored for DO300 door knife systems. By following the correct selection, installation, maintenance, and replacement guidelines, elevator maintenance teams can effectively ensure the smooth and reliable operation of elevator doors, reduce door system failures, and enhance passenger ride experience. Choosing Nanjing Zhuye Elevatorparts means you get 100% authentic DO300 door knife rollers, plus professional support—including model confirmation, on-site installation guidance, and prompt after-sales service. Trust Nanjing Zhuye Elevatorparts for the smooth rolling of your DO300 door knife system.
