How do you determine whether the scale grate bars need to be replaced?

Nov 18,2025

To determine whether the scale grate bars need replacement, focus on three key indicators: "degree of visual damage, abnormal operational behavior, and extent of dimensional wear." If any of these critical criteria are met, replacement is necessary. Here's how to make the assessment:
1. Visual Inspection: Directly Determine the Degree of Damage
If the grate bars develop cracks, fractures, or burn-through holes—especially in load-bearing areas or regions with intense combustion—their immediate replacement is essential once such damage occurs.
The grate bars show severe surface wear, with a noticeable reduction in thickness (compared to new grate bars, the wear exceeds 30%), or significant curling and deformation at the edges, compromising the overlapping seal with adjacent grate bars. These issues require timely replacement.
If the fixed parts of the grate bars are damaged—such as bolt holes worn or deformed, retaining clips dislodged, or loose connections between the grate bars and chains—resulting in an unstable fit and posing a risk of detachment, they must be replaced immediately.


2. Monitoring Operational Status: Indirectly Identifying Potential Hazards
When the grate was running, it experienced localized sticking and unusual noises. After investigation, it was found that one or more grate bars had deformed or become jammed, and these issues couldn't be resolved by adjustment—instead, the faulty grate bars needed to be replaced.
The coal leakage suddenly increased, and the overlapping gaps between the grate bars in the corresponding area have noticeably widened—likely due to wear or deformation of the grate bars, requiring targeted replacement.
If the grate bars become tilted, displaced, or even partially detached during operation—even if they’re not completely damaged—they must be replaced immediately to prevent cascading failures.
3. Dimensional Accuracy Inspection: Quantitatively Assessing Wear
Use a caliper to measure the critical dimensions of the grate bars (such as length, thickness, and overlap edge width), and compare them with the standard dimensions of new grate bars. If the deviation exceeds 10% of the design value—impacting assembly accuracy and operational stability—the components must be replaced.
Check the clearance between the grate bars and the side seals and guide rails. If the gap is too large (exceeding 5 mm), causing significant air leakage, or if the gap is too small, leading to abnormal friction, replace any worn or deformed grate bars.