Description

Elevator door knife spring V15/V35 Brief Introduction

Product Name	Elevator door knife spring
Model Number	V15/V35
Quality	Original.Brand New
Payment	T/T. Paypal. Western Union
Delivery	3-5 Working Days
Packaging	Packed by carton

Elevator Door Knife Spring V15/V35 – Nanjing Zhuye Elevatorparts

The elevator door knife is a core component that controls the opening and closing of elevator landing doors, and the door knife spring serves as its “elastic core” to ensure reliable clamping and flexible reset of the door knife. The Elevator Door Knife Spring V15/V35 (covering V15 and V35 models) provided by Nanjing Zhuye Elevatorparts is a high-performance elastic component tailored for elevator door knife systems. It is widely compatible with mainstream elevator brands such as Schindler, OTIS, and KONE, suitable for various elevator door knife models matching V15/V35 specifications. This spring features excellent elastic resilience, high fatigue resistance, and stable performance, ensuring the door knife can accurately clamp the landing door lock hook during elevator operation and reset smoothly after opening the door. Crafted with high-quality stainless steel (SUS304) and subjected to precision coiling and heat treatment, it meets international elevator safety standards (EN 81-20, GB 7588) and has become a trusted choice for global elevator maintenance teams and manufacturers.

Nanjing Zhuye Elevatorparts adheres to the core philosophy of “Elastic Stability, Durable Resilience” and implements strict quality control throughout the production process of the V15/V35 elevator door knife spring. Each unit undergoes rigorous testing, including elastic force calibration, fatigue life testing, corrosion resistance verification, and dimensional accuracy assessment. The V15 model has an elastic force range of 8-12N, while the V35 model ranges from 15-20N, both with precise elastic force tolerance (±0.5N) to match different door knife clamping requirements. The high-quality SUS304 stainless steel material effectively resists corrosion and rust, adapting to the harsh environment of the elevator shaft (high humidity, dust, slight salt spray). After 1 million times of fatigue testing, the spring’s elastic deformation rate is less than 3%, ensuring long-term stable performance. The smooth surface treatment avoids wear on the door knife and lock hook, further extending the service life of the entire door system.

Usage Guide for Elevator Door Knife Spring V15/V35

Correct installation, adjustment, and maintenance are crucial to ensuring the reliable performance of the V15/V35 elevator door knife spring. Nanjing Zhuye Elevatorparts emphasizes that only certified elevator maintenance technicians are allowed to perform related operations, as improper use may lead to door knife failure or landing door opening/closing faults.

1. Pre-Installation Preparation

First, confirm that the elevator’s MAC car lighting controller model matches the POWCV24181MH power supply (check parameters such as input voltage, output voltage, output current, and installation dimensions). Consult Nanjing Zhuye Elevatorparts’ technical team if there is any uncertainty about compatibility. Then, cut off the elevator’s main power supply and the secondary power supply for the car lighting system, lock the switch, and place a “Maintenance in Progress” warning sign at the elevator landing doors and machine room entrance. Locate the power supply installation position (usually on the car top or in the car control cabinet) and clean the area to remove dust, debris, and oil stains. Finally, prepare professional tools such as a screwdriver, wire stripper, multimeter, and insulation tester, and check that the new POWCV24181MH power supply from Nanjing Zhuye Elevatorparts is intact (no damage to the shell, no loose pins).

First, confirm that the elevator door knife model matches the V15/V35 spring (select V15 or V35 based on door knife specifications; check parameters such as spring diameter, length, and elastic force). Consult Nanjing Zhuye Elevatorparts’ technical team if there is any uncertainty about compatibility. Then, cut off the elevator’s main power supply and the secondary power supply for the door system, lock the switch, and place a “Maintenance in Progress” warning sign at the landing doors and machine room entrance. Fix the elevator car door in an open state with a support rod to prevent accidental movement. Finally, prepare professional tools such as pliers, screwdriver, caliper, and spring hook, and clean the door knife assembly to remove dust, debris, and old lubricant residues.

DebuggDebugg2. Installation & Calibration

Use pliers to gently press the spring fixing clip on the door knife and take out the old spring (note the installation direction of the old spring for reference). Inspect the spring installation groove and fixing clip for wear, deformation, or corrosion—repair or replace if necessary. Take the new V15/V35 spring from Nanjing Zhuye Elevatorparts, apply a thin layer of special elevator lubricating oil to its surface, and install it into the groove according to the correct direction. Use a spring hook to assist in fixing the spring to the clamping points, ensuring the spring is fully seated and the fixing clip is locked tightly. After installation, debug the door knife: Manually pull the door knife to check if it resets flexibly under the spring’s action; confirm the door knife can clamp the landing door lock hook tightly when the car door is closed and release it smoothly when the car door is opened. Use a caliper to check the spring’s compression length to ensure it is within the range specified by the door knife manual.

Debugg3. Operation & Daily Maintenance

Remove the support rod fixing the car door, restore the power supply, and switch the elevator to inspection mode. Operate the car door to open and close 10-20 times repeatedly to check the door knife’s working stability—there should be no abnormal noise, jamming, or failure to clamp/release the landing door. After 2 hours of stable operation, stop the elevator and inspect the spring again to confirm no abnormal deformation or loosening. For daily maintenance, inspect the spring during weekly door system patrols: Check if the spring is deformed, cracked, or loose; confirm the fixing clip is intact; apply lubricating oil to the spring and installation groove every 2 months to reduce friction and prevent rust. Every 3 months, use a force gauge to test the spring’s elastic force (replace if deviation exceeds ±1N); every 6 months, disassemble the door knife assembly to thoroughly clean the spring and installation area.

Replacement Cycle of Elevator Door Knife Spring V15/V35

The replacement cycle of the V15/V35 door knife spring is closely related to the frequency of door opening and closing and the operating environment. Under normal circumstances (elevator daily operation 12-24 hours, daily door opening and closing times ≥ 1000, operating environment dry and low-dust, regular lubrication), Nanjing Zhuye Elevatorparts recommends a replacement cycle of 1.5-2.5 years. This cycle is determined based on long-term field operation data, spring fatigue tests, and material aging analysis, fully considering the attenuation of the spring’s elastic force and the wear of the material.

For elevators in high-traffic areas (e.g., large shopping malls, airports with daily door opening and closing times ≥ 2000) or harsh environments (e.g., coastal areas with high salt spray, industrial sites with heavy dust, high-humidity regions), the replacement cycle should be shortened to 8-12 months. High-frequency compression and stretching accelerate spring fatigue, while harsh environments cause corrosion of the stainless steel material, reducing elastic performance. For low-usage elevators (e.g., villa elevators, small office buildings with daily operation time < 8 hours) in stable environments, the cycle can be extended to 2.5-3.5 years, but only after inspection and confirmation by Nanjing Zhuye’s technicians that the spring’s elastic force and structural integrity meet safety standards.

Replace the spring immediately if any of the following issues occur, regardless of its service life: The spring is obviously deformed, cracked, or broken; the elastic force deviates by more than ±1N (uncorrectable by adjustment); the spring is loose and cannot reset the door knife normally, causing the door knife to fail to clamp or release the landing door; the spring surface is severely rusted or corroded, affecting structural strength; the door knife has abnormal noise or jamming during operation, and the fault is confirmed to be caused by the spring.

The Elevator Door Knife Spring V15/V35 from Nanjing Zhuye Elevatorparts integrates stable elasticity, durability, and strong compatibility, providing a solid mechanical guarantee for elevator door knife systems. By following the correct usage, maintenance, and replacement guidelines, you can effectively ensure the reliable operation of the door knife and landing door, prevent safety accidents caused by door system faults, and improve the overall safety and stability of the elevator. Choosing Nanjing Zhuye Elevatorparts means you get 100% authentic V15/V35 door knife springs, as well as professional services including model matching, on-site installation guidance, and timely after-sales support. Trust Nanjing Zhuye Elevatorparts for the safety of your elevator door system.

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