Quality appraisal of saltpeter mill

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saltpeter mill takes the synergy of high-pressure grinding and particle size control as its core principle. By optimizing the grinding roller pressure, rotor speed and classification accuracy, it achieves the synergy of saltpeter powder fineness, output stability and energy consumption economy. It is widely used in the fields of chemical industry, pesticides, glass and fireworks manufacturing. In the processing of high-purity saltpeter, it is used for explosion-proof design and anti-corrosion (acid and alkali-resistant coating) requirements; in the preparation of ultra-fine powder, it meets the requirements for particle size distribution concentration; in intelligent scenarios, it ensures the reliability of remote monitoring and automatic adjustment functions. Compared with traditional equipment, the saltpeter grinding mill has the characteristics of multi-stage classifier linkage, wear-resistant alloy grinding roller and pulse dust removal. It is the core equipment of saltpeter deep processing.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for saltpeter grinding machines. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for the quality appraisal of saltpeter grinding machines.

As the demand for fine chemicals increases, related quality dispute cases increase significantly. The focus of judicial disputes is:

1, dispute over performance indicators: excessive fineness of finished product, unit energy consumption;

2, material defects: peeling off of the hardened layer on the surface of the grinding roller, insufficient corrosion resistance of the grading blades;

3, process problems: grinding chamber temperature control deviation, bearing vibration intensity;

4, contract performance dispute: core modules (such as imported dynamic classifiers, explosion-proof control systems) are inconsistent with the technical agreement.

0 Such cases need to pass powder performance testing, material failure analysis and dynamic operation verification to clearly define the quality responsibility.

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1, appearance inspection

inspects the appearance of the saltpeter grinding machine, including the overall structure of the equipment, the integrity of the parts, the quality of the surface coating, etc. Check the equipment for obvious damage, deformation, rust, etc. These problems may affect the normal operation of the equipment.

2, performance test

In accordance with the requirements of relevant standards and technical contracts, various performance indicators of the saltpeter mill are tested, such as rotation speed, output, particle size, etc. Through performance testing, you can determine whether the equipment meets the user's requirements.

3, electrical system detection

0 detects the electrical system of the grinding mill, including motor, control cabinet, cables, etc. Check the working status, insulation performance, grounding conditions, etc. of electrical components to ensure the safe and reliable operation of the electrical system.

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24, wear analysis

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4 conducts wear analysis on key parts of the grinding mill, such as grinding discs, grinding rollers, bearings, etc. By detecting the degree of wear of parts, the usage and life of the equipment can be judged, as well as whether there are quality problems caused by wear.

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A chemical factory of the applicant signed an "Ultra-fine saltpeter grinding machine purchase contract" with an equipment manufacturer of the respondent, and it was agreed that D97 ≤ 8 μm. After being put into production, the actual measured D97 reached 18μm. The manufacturer argued that it was caused by the high moisture content of the raw materials.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreements, on-site investigation case materials and other data of the "Saltpeter Grinding Machine" , made the following quality analysis opinions:

The classifier blade installation angle of the saltpeter mill involved in the case deviated by 3° (agreement ≤ 1°), the Cr content of the grinding roller was 22% (agreement ≥ 25%); the temperature of the grinding chamber fluctuated ±15°C (agreement ±5°C), resulting in particle agglomeration.

The appraisal conclusion concluded that the equipment grading system and material defects were the main reasons for the excessive fineness.

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Saltpeter mill 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 log;

3, testing method and equipment list (such as Laser particle size analyzer, direct reading spectrometer);

4, correlation analysis between test data and failure (such as the impact of grading angle on fineness);

05, clarify the quality responsibility judgment conclusion and technical basis;

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

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