Mining equipment quality appraisal

mining equipment is based on the core principle of synergy between high-strength materials and high-efficiency power systems. Through optimized structural design, hydraulic transmission accuracy and intelligent control systems, it achieves the synergy of mining efficiency, safety and durability. It is widely used in open-pit mines, underground mining, mineral processing and tunnel excavation and other fields. In open-pit mining, it is used for collaborative operations between large electric shovels and mining trucks; in underground scenarios, it meets the explosion-proof and low-emission requirements of continuous miners; in mineral processing, it ensures the wear resistance of crushers and screens. Compared with general engineering machinery, mining equipment has the characteristics of strong fatigue resistance, wide environmental adaptability, and long maintenance cycle. It is the core equipment for the efficient development of mineral resources.

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

With the upgrade of safety and efficiency standards in the mining industry, there has been a significant increase in related quality disputes. The judicial dispute focuses on:

1, performance indicator dispute: whether the actual production capacity meets the standard, and the leakage rate of the hydraulic system exceeds the standard;

2, material defects: insufficient hardness of the wear-resistant steel plate, toughness of key welds Not up to standard;

3, process problems: stress concentration on structural parts, uneven depth of carburized layer of gearbox;

4, contract performance dispute: core component brand replacement, intelligent module does not match the technical agreement.

Quality appraisal of mining equipment involves complex techniques and requires the use of multiple professional technical methods. Common technical methods include:

1. Appearance inspection: Check the appearance of the equipment for defects, corrosion, deformation and other problems.

2. Dimensional inspection: Measure whether the dimensions of each component of the equipment meet the design requirements.

3. Material analysis: Analyze the material composition, hardness, strength and other properties of the equipment.

4. Functional test: Test the switch operation, operating performance, load capacity and other functions of the equipment.

A mining group of the applicant signed a "Hydraulic Excavator Procurement Contract" with an equipment manufacturer of the respondent, stipulating that the digging force of the bucket should be ≥800kN. The bucket cracked during operation, causing the work to stop. The manufacturer argued that it was caused by overloading.

Identification analysis results:

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

The impact energy of the bucket material of the mining equipment involved in the case is only 20J (agreement ≥40J), and the Cr content is 1.2% (agreement ≥1.8%); the proportion of unfused weld defects is 12% (standard ≤5%); during the dynamic load test, the hydraulic system pressure fluctuated ±4MPa (agreement ≤±2MPa).

The appraisal conclusion determined that defects in material composition and welding process were the main causes of failure.

The mining equipment quality appraisal report should include:

1, appraisal purpose and reference standards;

2, specifications of the pipe involved, production batch number, construction record;

3, testing method Methods and equipment list;

4, correlation analysis of test data and failure;