Identification of roller quality

The

double-roller machine takes the synergy of double-roller extrusion crushing and particle size control as the core principle. By optimizing the roller pressure, processing capacity and roller surface wear-resistant layer life, it achieves the synergy of material crushing particle size, system stability and energy consumption economy. It is widely used in fine crushing operations of metal ores, non-metallic ores and construction aggregates. In iron ore fine crushing, it is used for efficient pre-crushing of materials before grinding; in quartz sand processing, it meets the demand for low crushing rates; in intelligent scenarios, it ensures adaptive adjustment and remote monitoring of the roll gap. Compared with traditional crushing equipment, the roller mill has the characteristics of precise particle size control, high-chromium alloy roller surface and multi-stage dust removal. It is the core equipment of fine crushing.

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

With the improvement of fine crushing process requirements, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1. Dispute over performance indicators: crushing particle size exceeds standard, unit energy consumption >agreed value (such as agreement ≤1.5kWh/t, actual measurement ≥2.2kWh/t);

2. Material defects: high chromium alloy layer peeling off the roller surface (Cr content <25% agreement ≥2 8%), bearing seat casting porosity > 2%;

3, process problems: hydraulic system pressure fluctuation > ±10%, roll gap adjustment delay > 0.5 seconds;

4, contract performance dispute: core modules (such as imported hydraulic servo systems, intelligent wear monitoring modules) are inconsistent with the technical agreement.

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

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roller machine litigation quality appraisal mainly includes the following technical methods:

1, physical detection method

The physical detection method mainly determines whether there are quality problems in the equipment by testing the appearance, size, hardness and other physical properties of the sand mill. For example, use measuring tools such as calipers and micrometers to measure the dimensions of parts; use a hardness tester to detect the hardness of parts.

2, chemical analysis method

The chemical analysis method mainly analyzes the material composition of the sand mill to determine whether the material meets the requirements. For example, a spectrum analyzer is used to analyze the composition of metal materials to see if they contain impurities or elements that do not meet regulations.

03, non-destructive testing method

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2 The non-destructive testing method is to detect defects within the equipment without damaging the equipment. For example, use an ultrasonic flaw detector to inspect the welds of equipment to see if there are defects such as cracks.

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An iron ore factory of the applicant signed an "Iron Ore Roller Machine Purchase Contract" with an equipment manufacturer of the respondent, and it was agreed that the crushing particle size ≤3mm accounted for ≥90%. After being put into production, the actual measurement was only 75%. The manufacturer argued that it was caused by fluctuations in the hardness of the ore.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "roller machine", contract technical agreement, on-site inspection case materials and other data. The following quality analysis opinions were made:

The roller surface Cr content of the roller machine involved in the case was only 23% (agreement ≥ 28%), the hydraulic system pressure fluctuated by ±15% (agreement ±5%), and the roll gap adjustment was delayed by 0.8 seconds (agreement ≤ 0.5 seconds), resulting in out-of-control particle size.

The appraisal conclusion determined that material defects and control system defects were the main causes of failure.

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Roller 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, 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 Cr content on wear resistance);

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

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

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