Mine winch quality appraisal

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mining winch is based on the core principle of high-torque transmission and safe braking synergy. By optimizing the drum rope capacity, lifting speed and braking response time, it achieves the synergy of heavy-load lifting, emergency braking safety and long-term operation reliability. It is widely used in fields such as mine hoisting, slope transportation and rescue equipment traction. In deep well mining, it is used for vertical transportation of ore/personnel/equipment; in inclined tunnels, it meets the continuous traction requirements under large inclination conditions; in emergency rescue, it ensures rapid response and safe braking. Compared with traditional winches, mining winches have the characteristics of intelligent control, impact load resistance and explosion-proof safety, and are the core equipment for safe production in mines.

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

As the depth of mining increases, related quality dispute cases increase significantly. The judicial dispute focuses on:

1, performance index dispute: the maximum load does not meet the standard, and the braking deceleration is insufficient;

2. Material defects: the tensile strength of the steel wire rope is insufficient, and the friction coefficient of the brake disc is attenuated;

3, process problems: gearbox tooth surface contact spots, depth indicator accuracy deviation;

4, contract performance dispute: core modules (such as explosion-proof electronic control system, redundant braking unit) are inconsistent with the technical agreement.

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

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The technical method of identifying the quality of the proceedings in respect of the mine winch at HTMLGTOKEN is, inter alia, to examine the appearance of the winch with defects in shape, rust and cracks.

measurements: measures the size of the main components of the winch, compared to design drawings or relevant standards, and checks for compliance. Material testing of

: material testing of the main receptor components of the winch, including chemical composition analysis, mechanics performance testing, etc.

HTMTAGTOKEN8 functional test: An empty and full-load operation test of the winch to check its ability to upgrade, brake performance, safety devices, etc. (b) Expert validation of HTMLGTOKEN9

0: Industry experts are invited to evaluate the results and provide expert opinions.

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A mine of the applicant signed a "50t explosion-proof winch purchase contract" with an equipment manufacturer of the respondent, and it was agreed that the braking deceleration should be ≥1.5m/s². In the accident, the brake failed and the car rolled away. The manufacturer argued that it was caused by overloading and illegal operation.

Identification analysis results:

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

The friction coefficient of the brake disc of the mining winch involved in the case is only 0.25 (agreement ≥0.4), the pressure fluctuation of the hydraulic station is ±20% (agreement ±5%); the breaking tension of the wire rope is only 45t (agreement ≥50t), and the safety factor under dynamic load is <5 (agreement ≥6).

The appraisal conclusion concluded that defects in the braking system and materials were the main causes of the accident.

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Mining winch quality appraisal report should include:

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

2, involved equipment model, safety certificate, operation log;

3, detection method and equipment list (such as twist torque sensor, SEM);

4, analysis of detection data and failure correlation (such as the impact of friction coefficient on braking force);

05, clear quality responsibility judgment conclusion and technical basis;

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26, signature of appraiser, mine safety engineer qualification certificate and official seal of the organization.

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