Sand making machine quality appraisal

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sand making machine takes the synergy of high-speed impact and grinding and crushing as its core principle. By optimizing the rotor linear speed, crushing capacity and wear-resistant parts life, it achieves the synergy of material particle size control, system stability and energy consumption economy. It is widely used in the production of construction aggregates, mining gravel and machine-made sand. In hard rock crushing, it is used for high-efficiency sand production of granite/basalt; in wet process, it meets the cleaning and shaping needs of materials with high mud content; in intelligent scenarios, it ensures real-time response to remote monitoring and fault warning. Compared with traditional equipment, the sand making machine has the characteristics of multi-cavity optimized design, high-chromium alloy throwing head and hydraulic gap adjustment. It is the core equipment for sand and gravel aggregate production.

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

As the standards for sand and gravel aggregates become stricter, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: the finished product particle size exceeds the standard, unit energy consumption is >agreed value;

2, material defects: insufficient thickness of the wear-resistant layer of the throwing head, shrinkage rate of the bearing seat casting ;

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

4, contract performance dispute: core configuration (such as imported bearing brand, intelligent lubrication system) does not match 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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sand making machine quality appraisal technical methods mainly include:

1, non-destructive testing method

Non-destructive testing method refers to a method of testing the internal quality of components without damaging the equipment components. Commonly used non-destructive testing methods include ultrasonic testing, magnetic particle testing, radiographic testing, etc. Ultrasonic testing can detect whether there are cracks, pores and other defects inside components; magnetic particle testing is suitable for detecting surface and near-surface defects of ferromagnetic materials; radiographic testing can detect macroscopic defects inside components.

2, physical and chemical analysis method

The physical and chemical analysis method refers to the method of analyzing the material composition, organizational structure, mechanical properties, etc. of the equipment. Chemical analysis can determine whether the composition of the material meets the requirements; metallographic analysis can observe the structure of the material and judge the quality and performance of the material; mechanical property testing can detect the strength, hardness, toughness and other performance indicators of the material.

03, simulation test method

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2 The simulation test method refers to a method of simulating the actual operating conditions of the equipment in the laboratory or on site to test the performance and reliability of the equipment. For example, by simulating different feed particle sizes and feed volumes, the production capacity and product quality of the sand making machine are tested; by simulating long-term continuous operation, the reliability and stability of the equipment are tested.

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A sand and gravel factory of the applicant signed a "Vertical Shaft Impact Sand Making Machine Purchase Contract" with an equipment manufacturer of the respondent, and it was agreed that the proportion of finished products ≤5mm should be ≥88%. After being put into production, the actual measurement was only 72%. The manufacturer argued that it was caused by fluctuations in the hardness of the raw materials.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "sand making machine", contract technical agreement, on-site investigation case materials and other data, and made a comprehensive technical analysis. The following quality analysis opinions are given:

The sand making machine involved in the case has a Cr content of 23% in the throwing head (agreement ≥ 26%), a wear-resistant layer thickness of 18mm (agreement ≥ 25mm), and a rotor dynamic balance grade of G8.3 (agreement ≤ G6.3), resulting in a decrease in crushing efficiency.

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

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Sand making machine 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, detection method and equipment list (such as laser Optical particle size analyzer, direct reading spectrometer);

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

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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