Mining loader quality appraisal

The

mining loader takes the synergy of high-load transportation and power stability as its core principle. By optimizing engine power, transmission system torque and hydraulic control accuracy, it achieves synergy between efficient loading of ores, climbing ability and adaptability to complex terrain. It is widely used in the field of material transportation in open-pit mines, underground mines and tunnel projects. In open-pit mining, it is used for short-distance transportation of stripped earth and ore; in underground mines, it meets the flexible transportation needs of trackless mining; in tunnel construction, it ensures efficient removal and transportation of muck. Compared with traditional transportation equipment, mining loaders have the characteristics of high structural strength, explosion-proof safety and intelligent control, and are the core equipment of modern mining operations.

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

As the intensity of mining operations increases, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1. Dispute over performance indicators: insufficient actual load capacity and low transmission efficiency;

2. Material defects: insufficient impact toughness of the frame steel plate and peeling off of the hydraulic cylinder coating;

3, process problems: the welding joints are not fused, and the brake system response is delayed;

4, contract performance disputes: core modules (such as imported hydraulic torque converters, explosion-proof electrical systems) are inconsistent with the technical agreement.

0 Such cases need to pass dynamic load testing, material failure analysis and safety performance verification to clarify the ownership of quality responsibility.

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Mining loader litigation quality appraisal mainly includes the following technical methods:

1. Appearance inspection: Check the overall appearance, paint quality, weld strength, etc. of the loader.

2. Performance test: Test performance indicators such as shovel loading capacity, conveying speed, and lifting height in accordance with national standards.

3. Structural dimension inspection: measure the dimensional accuracy of key components, such as bucket volume, conveyor belt width, sprocket diameter, etc.

4. Material analysis: Conduct material analysis on key components to verify whether their strength, hardness and wear resistance meet standard requirements.

05. Fault analysis: Check whether the equipment has faults that affect its normal use, such as leakage in the hydraulic system, short circuit in the electrical system, etc.

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A mining group of the applicant signed a "50t Mining Loader Procurement Contract" with an equipment manufacturer of the respondent, and it was agreed that the maximum gradient should be ≥35%. Slide accidents occur frequently during use, and the manufacturer contends that they are caused by operator overloading.

identification analysis results:

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

The efficiency of the hydraulic torque converter of the mining loader involved in the case is only 65% (agreement ≥85%), the measured engine power is 280kW (agreement ≥300kW); the unfusion rate of the frame welds is 8% (agreement ≤3%), and the bending strength is only 420MPa (agreement ≥500MPa).

The appraisal conclusion determined that power system and structural defects were the main reasons for insufficient performance.

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Mining loader quality appraisal report should include:

1, appraisal purpose (such as safety accident attribution, performance verification) and reference standards;

2, equipment model involved, production batch, operation record;

3 , Testing methods and equipment list (such as torque tester, direct reading spectrometer);

4, Testing data and failure correlation analysis (such as the impact of transmission efficiency on climbing ability);

05, Clarify the quality responsibility judgment conclusion and technical basis; 6. Signature of the appraiser, mining mechanical engineer qualification certificate and official seal of the organization.

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