Quality appraisal of lifting ring assembly equipment

lifting ring assembly equipment takes the core principle of high-precision assembly and synergy of mechanical properties as its core principle. By optimizing torque control, pressure accuracy and material strength, it achieves the synergy of assembly accuracy, load-bearing capacity and fatigue life of lifting ring components. It is widely used in hoisting machinery, ship anchor chains, aerospace and industrial hoisting fields. In the manufacturing of heavy-duty spreaders, it is used for precision riveting of high-strength alloy lifting rings; in the field of ship anchor chains, it meets the requirements for non-destructive assembly of oversized chain rings; in high-altitude operating equipment, it ensures the fatigue resistance of safe lifting points. Compared with traditional assembly equipment, lifting ring assembly equipment has the characteristics of multi-axis synchronous control (servo drive + force feedback), intelligent quality inspection (machine vision + AI defect identification) and process traceability (data cloud storage), and is the core guarantee equipment for hoisting safety.

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

As lifting safety regulations become stricter, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: static load test failure, insufficient fatigue life;

2, material defects: alloy element deviation of the lifting ring, hydrogen-induced cracking of the weld;

3, process problems: torque control accuracy exceeds standard, riveting pressure fluctuates;

4, contract performance dispute: core modules (such as imported servo motors, high-precision force sensors) are inconsistent with the technical agreement.

Technical methods for quality appraisal of lifting ring assembly equipment mainly include:

1. Appearance inspection

First, inspect the appearance of non-standard lifting ring assembly equipment, including whether there is obvious damage or deformation to the overall structure of the equipment, and whether there are scratches, rust, etc. on the surface of the parts. Appearance inspection can initially determine whether the equipment has been impacted by external forces or has improper maintenance.

2 and performance test

test various performance indicators of the equipment, such as assembly accuracy, running speed, stability, etc. By actually assembling the lifting ring, measuring the size and angle after assembly, and evaluating the assembly accuracy of the equipment; observing the vibration and noise level of the equipment during operation, and judging the operational stability of the equipment.

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A crane manufacturer of the applicant signed a "High-Strength Lifting Ring Automatic Assembly Line Procurement Contract" with an equipment manufacturer of the respondent, and it was agreed that the static load should be ≥ 5 times the load. In the test, the breaking load of the lifting ring was only 3.8 times. The manufacturer argued that it was caused by overloading during operation.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreements, on-site inspection case materials and other data of "Lifting Ring Assembly Equipment" and made the following quality scores Analytical opinion:

The riveting pressure deviation of the lifting ring assembly equipment involved in the case is ±15% (agreed ±5%), the Ni content of the lifting ring material is only 1.0% (agreed 1.2-1.6%); UT inspection of the weld found a Φ3mm crack (agreed ≤Φ1mm), and the fatigue life is only 50% of the agreed value.

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

The lifting ring assembly equipment quality appraisal report should include:

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

2, involved equipment model, process parameters, production batch;

3, testing method and equipment list (such as Universal testing machine, direct reading spectrometer);

4, analysis of test data and failure correlation (such as the impact of material composition on bearing capacity);