Product Overview-ZGM Pulverizer Coupling Pin 20MG40.11.02.J

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Product Overview

The is a specialized core spare part for the main reducer coupling of ZGM-type medium-speed roller coal pulverizers. Its primary functions include torque transmission, vibration buffering, and component connection/positioning. It directly impacts the operational stability and safety of the pulverizer’s drive system. This spare part is compatible with mainstream ZGM series models, such as the ZGM113N, and is widely utilized in the pulverizing systems of thermal power plants. It is a critical component that requires focused attention and standardized replacement during power plant maintenance and pulverizer overhauls.

As a custom-engineered spare part, the Coupling Pin 20MG40.11.02.J must be used in conjunction with Elastic Rings (e.g., MG40.11.02.97). Their synergistic effect optimizes transmission precision and reduces vibrational impact during operation, strictly adhering to the assembly requirements specified in the maintenance protocols for ZGM-type medium-speed roller pulverizers.

In the drive structure of the ZGM pulverizer, the main reducer transmits power through a coupling connected to the motor. As the core load-bearing component of the coupling, the performance of the 20MG40.11.02.J pin directly determines the overall operating efficiency and maintenance cycles of the machine. High-quality coupling pins and their matching accessories are essential for ensuring the continuous, stable operation of the pulverizing system and reducing unplanned outages.

Technical Features and Advantages

The 20MG40.11.02.J coupling pin is designed and manufactured in strict accordance with the GB/T 5015-2017 standard for elastic cylindrical pin gear couplings. It offers multiple technical advantages in material selection, processing, and structural compatibility, tailored for the high-intensity operation and periodic maintenance found in power plants.

1. Precision Fit and Maintenance Compliance

The dimensional parameters of the pin are precisely calibrated, with diameter tolerances controlled at the H7 level and end-face runout not exceeding 0.1mm. This ensures a perfect fit for the ZGM main reducer coupling without the need for additional machining. It is designed to be replaced alongside other core components such as carbon seal rings, tie-rod sleeves, and oil seal support rings to meet the rigorous requirements of complete set replacement during overhauls.

2. Superior Material and Durability

High-Strength Alloy: Manufactured from high-strength alloy steel that balances hardness and toughness, allowing it to withstand heavy impact loads and continuous torque without deformation.
Surface Treatment: The pin undergoes a standardized blackening (chemical oxidation) process, forming a 1–3μm thick magnetite Fe_3O layer.
Corrosion Resistance: It passes a 24–48 hour neutral salt spray test, significantly enhancing its resistance to rust and moisture in complex power plant environments.
Surface Hardness: The coating hardness reaches HV 150-200, providing resistance to minor friction and extending the service life of the component.

3. Synergistic Efficiency and Transmission Stability

When paired with the MG40.11.02.97 elastic ring, the assembly effectively absorbs vibration shocks between the motor and the reducer. This reduces vibration transmission to peripheral components like the roller seal air pipes and shaft sleeves. Furthermore, the structure compensates for minor installation misalignments, ensuring stable torque delivery and reduced noise levels.

4. Standardized Production for Easy Maintenance

The 20MG40.11.02.J follows a standardized production workflow, with every batch undergoing strict dimensional and load testing. Its simple structure allows for rapid disassembly and replacement, synchronized with other maintenance tasks (such as replacing scraper plates or proportional relief valves), thereby reducing downtime and maintenance costs.

Core Spare Parts Compatibility Table

Spare Part Name	Model	Target Component	Synergetic Function with 20MG40.11.02.J
Coupling Pin	20MG40.11.02.J	Main Reducer Coupling	Core load-bearing part; transmits torque and buffers vibration.
Elastic Ring	MG40.11.02.97	Coupling Pin Accessory	Synergistic buffering; optimizes transmission stability.
Carbon Seal Ring	300MG41.11.06.98	Sealing System	Ensures sealing; prevents contaminants from entering the drive system.
Tie-rod Sleeve	21MG40.11.13.01	Tie-rod Assembly	Ensures structural stability; reduces load fluctuations on the pin.
Oil Seal Ring	20MG40.11.09.83J	Sealing System	Prevents oil leaks from eroding the coupling pins.
Scraper Plate	20MG40.11.07.01.96	Grinding System	Stabilizes grinding; reduces overall vibration and impact on pins.
Relief Valve	20MG00.21.14	Hydraulic System	Regulates pressure; optimizes the load environment for the pin.

Application Scenarios

The primary application for the 20MG40.11.02.J is the installation and maintenance of main reducer couplings in ZGM-type medium-speed roller pulverizers. While mostly used in thermal power plant coal systems, it is also applicable to similar pulverizers in the metallurgy and building materials industries.

Maintenance Standards:

Monthly: Check the wear of the coupling pins and the aging of the elastic rings.
Quarterly: Clean surface impurities from the pins.
Annually: Perform a full disassembly inspection; replace aged pins and elastic rings.
Troubleshooting: If abnormal vibration, unstable torque, or coupling noise occurs, the coupling pin should be the first component inspected for wear, deformation, or fracture.

By providing a high-quality, standardized component, suppliers help power plants extend the operational cycle of their drive systems and lower overall O&M (Operations and Maintenance) costs.