Charger Quality Identification

The

charger is based on the core principle of high-precision pressure control and material transportation synergy. By optimizing the charge density, sealing structure pressure resistance and dynamic metering accuracy, it can achieve safe filling, quantitative filling and efficient operation of hazardous materials such as explosives and chemical raw materials. It is widely used in fields such as mine blasting, military manufacturing, chemical production and tunnel construction. In mine blasting, it is used to control the density consistency of blasthole charges; in the military industry, it meets the anti-static and explosion-proof requirements for ammunition loading; in chemical production, it ensures the stable transportation of high-viscosity materials. Compared with traditional manual charging, the charging machine has the characteristics of high safety, excellent automation and wide environmental adaptability, and is the core equipment in high-risk operation scenarios.

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

With the upgrade of safety production standards, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: excessive charge density deviation, pressure seal failure;

2, material defects: insufficient thickness of the wear-resistant layer of the delivery pipe, 316L stainless steel Cl⁻ stress corrosion Cracking;

3, process problems: metering valve repetition accuracy deviation, explosion-proof electrical box ground resistance;

4, contract performance dispute: key modules (such as servo metering system, explosion-proof certification level) do not comply with the technical agreement.

0 Such cases need to pass pressure testing, material failure analysis and explosion-proof safety verification to clarify the quality responsibility.

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Quality identification technical methods for the charger include:

1. Appearance inspection: Check the overall structure, surface defects, component integrity, etc. of the charger.

2. Functional test: Test the charging accuracy, charging speed, charging amount stability and other functional indicators of the charger.

3. Material analysis: Conduct material composition analysis on the key components of the charger to detect the strength, wear resistance, corrosion resistance, etc. of the material.

4. Stress analysis: Through finite element analysis or actual testing, analyze the stress distribution of the charger under working conditions and evaluate its structural strength and durability.

05. Safety inspection: Verify the safety protection measures of the charger, such as explosion-proof design, emergency stop device, etc.

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A mining company of the applicant signed an "Explosion-proof Charger Procurement Contract" with an equipment manufacturer of the respondent, and it was agreed that the charge density deviation would be ≤±2%. During use, there were many times when the charge amount was out of tolerance and the blasting effect was not up to standard. The manufacturer argued that it was due to the operator not preheating the equipment.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "charger", the contract technical agreement, the on-site investigation case materials and other data, and made the following quality analysis Opinion:

The metering valve repetition accuracy of the charger involved in the case has a deviation of ±3.5% (agreement ≤±1%), and the local thickness of the wear-resistant layer on the inner wall of the delivery pipe is only 1.8mm (agreement ≥3mm); the temperature drift of the servo system causes pressure control fluctuations of ±0.3MPa (agreement ±0.1MPa).

The appraisal conclusion determined that the measurement system and material defects were the main reasons for the out-of-tolerance.

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The charger quality appraisal report should include:

1, the purpose of the appraisal (such as attribution of performance disputes, safety compliance verification) and cited standards (GB 25285, ISO 80079, etc.);

2, equipment model involved, explosion-proof certificate number, production record;

3, detection method and equipment list (such as pressure sensor, spectrometer);

4. Analysis of the correlation between test data and failure (such as the impact of measurement accuracy on charge density);

05. Clarify the quality responsibility judgment conclusion and technical basis;

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26. Signature of the appraiser, qualification certificate of explosion-proof engineer and official seal of the organization.

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