Coal crusher quality appraisal

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coal crusher takes the synergy of high-speed impact and shear crushing as its core principle. By optimizing the rotor linear speed, crushing capacity and wear-resistant parts life, it achieves the synergy of coal particle size control, system stability and energy consumption economy. It is widely used in thermal power generation, coal washing and coal chemical industry. In lignite crushing, it is used for anti-blocking design of high-moisture coal; in hard coal crushing, it meets the impact toughness requirements of gangue content; in intelligent scenarios, it ensures real-time remote monitoring and fault warning. Compared with traditional equipment, the coal crusher has features such as multi-stage crushing chamber optimization, alloy composite hammer head and hydraulic overload protection, and is the core equipment for coal processing.

As an authoritative organization for judicial filing, Zhongke Testing provides coal crusher quality appraisal services. Relying on a team of mechanical dynamics and materials engineering experts and a CMA/CNAS certified laboratory, Zhongke Testing issues legally binding technical reports on issues such as insufficient crushing efficiency, excessive vibration, and abnormal loss of wear-resistant parts.

With the expansion of coal processing scale, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: excessive discharge particle size, unit energy consumption;

2, material defects: insufficient thickness of the surface hardened layer of the hammer head, inclusion level of the bearing seat casting;

3, process issues: rotor dynamic balance level, hydraulic system pressure fluctuation;

4, contract performance dispute: core configurations (such as imported bearing brands, intelligent lubrication systems) are inconsistent with the technical agreement.

0 Such cases need to pass crushing efficiency testing, material failure analysis and dynamic load verification to clarify the quality responsibility.

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1, Appearance inspection

Appearance inspection is the first step of identification. It mainly checks whether there is any obvious damage, deformation, corrosion, etc. on the appearance of the coal crusher. For example, check whether there are cracks in the fuselage, whether the paint is peeling off, whether there are missing parts, etc. Appearance inspection can initially determine whether the equipment has been impacted by external forces or used in harsh environments.

2, performance test

Performance test is the core content of the identification, including crushing performance test, dynamic performance test, safety performance test, etc. The crushing performance test mainly detects the crushing particle size, crushing efficiency and other indicators; the power performance test mainly detects the power, speed and other parameters of the motor; the safety performance test mainly tests whether the protective devices of the equipment are complete and whether the grounding is good. Through performance testing, we can fully understand the actual operation of the coal crusher and determine whether the equipment meets quality requirements.

3, material analysis

0Material analysis mainly conducts material composition analysis and mechanical performance testing of key parts of the coal crusher. For example, the material composition of parts that are prone to wear such as hammer heads and tooth plates is analyzed to determine whether they meet the design requirements; the mechanical properties of load-bearing parts such as bearings and shafts are tested to check whether their strength, hardness and other indicators are qualified. Material analysis can help determine whether quality issues are related to material quality.

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A power plant of the applicant signed a "Purchase Contract for Dual-Rotor Coal Crusher" with an equipment manufacturer of the respondent, and it was agreed that the proportion of discharged materials ≤30mm would be ≥92%. After being put into production, the actual measurement was only 78%. The manufacturer argued that it was caused by the high sulfur content in the coal.

identification analysis results: The expert group found that the thickness of the hardened layer of the hammer head is 9mm (agreement ≥ 12mm), the Cr content is 23% (agreement ≥ 26%), and the rotor dynamic balance grade is G8.3 (agreement ≤ G6.3), resulting in a decrease in crushing efficiency.

The appraisal conclusion concluded that material composition and dynamic balance defects are the main reasons for insufficient performance.

coal crusher quality appraisal report should include:

1, appraisal purpose (such as production accident attribution, performance verification) and reference standards;

2, involved equipment model, technical agreement, operation and maintenance records;

3, testing method and equipment list (such as grain Analyzer, direct reading spectrometer);

4, correlation analysis between test data and failure (such as the influence of Cr content on wear resistance);

05,clear quality responsibility judgment conclusion and technical basis;

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26,signature of appraiser, mechanical engineer qualification certificate and official seal of the organization.

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