ZGM113N Mill Hinge Shaft 20MG40.11.11.02 High-Toughness Transmission Pivot
The Hinge Shaft 20MG40.11.11.02 is a core transmission spare part for the ZGM113N medium-speed coal mill. Serving as the critical pivot point connecting the grinding roller and the rocker arm, it works in tandem with the hinge shaft device MG30.11.11. It performs the dual functions of transmitting loading force and guiding the roller's swing. Its material properties, machining precision, and structural stability are vital to the continuity and safety of coal pulverizing operations.
1. Product Overview
The 20MG40.11.11.02 hinge shaft is an essential hub for force distribution. According to the ZGM113 Maintenance and Overhaul specifications, hydraulic loading force is transmitted through the pressure frame and hinge device to this shaft, which then passes it to the grinding roller. Simultaneously, it supports the roller's free swing within a specified range to crush raw coal.
It is manufactured from Q235A carbon structural steel (conforming to GB/T 700-2006) and undergoes a Quenching + High-Temperature Tempering (QT) process. To withstand the humid and dusty environment inside the mill, the surface is treated with anti-rust paint. This part is precisely compatible with auxiliary components such as Shim Sets (MG30.11.12.07.96/97) and Guide Plates (MG30.11.12.06.94/99).
2. Technical Features and Advantages
The 20MG40.11.11.02 hinge shaft balances mechanical strength with toughness, ensuring reliability under high-intensity vibration.
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Mechanical Equilibrium: The Q235A material provides excellent plasticity and toughness (Yield Strength 235MPa. After QT treatment, the tensile strength can reach up to 883MPa, and yield strength up to 750MPa, preventing brittleness and reducing the risk of fracture or plastic deformation under alternating loads.
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Surface Durability: The surface hardness is controlled between HRC 45-50 (2HRC deviation), significantly improving wear resistance during the frequent swinging of the roller.
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System Synergy: Its dimensions are precisely calibrated to match the ZGM113N's structure, ensuring the roller's swing trajectory remains accurate. This prevents misalignment that could lead to vibration or decreased grinding efficiency.
Core Technical Specifications
| Parameter Category | Specific Indicator | Remarks |
| Model | Hinge Shaft 20MG40.11.11.02 | Dedicated for ZGM113N Mill |
| Material | Q235A (GB/T 700-2006) | Excellent plasticity for alternating loads |
| Process | Quenching + High-Temp Tempering | Balanced strength and toughness |
| Surface Hardness | HRC 45-50 | Enhanced wear resistance |
| Surface Treatment | Anti-rust Painting | Resists moisture and dust corrosion |
| Compatible Parts | MG30.11.11 Hinge Device, Shim Sets | Facilitates force transmission and guiding |
| Maintenance Cycle | 3,000 - 4,000 Hours (Mid-term) | Check for wear, deformation, and rust |
3. Application Scenarios
The hinge shaft is a priority item during power plant maintenance, with its status directly linked to the mill's operational stability.
Routine Maintenance
Every 1,000 hours, personnel should inspect the shaft for surface rust, cracks, or paint peeling. The clearance between the hinge shaft and its housing should be measured; if the gap exceeds 0.3mm, the shim sets must be adjusted or replaced.
Overhaul & Disassembly
During mid-term overhauls or if the roller swing becomes sluggish, the hinge device must be disassembled. After marking the pressure frame for reassembly, the shaft is removed from the roller bracket. It must be replaced if there is visible plastic deformation, cracks, or if the wear exceeds specified limits.
Emergency Troubleshooting
In the event of hydraulic system failures (e.g., MG00.11.19.01 valve seal failure) causing abnormal loading pressure, the hinge shaft may suffer from localized excessive wear. In such cases, the shaft must be replaced immediately to prevent secondary damage to the rocker arm or pressure frame.
HKZX-2026-01-30
