Quality appraisal of loading and unloading br

The

loading and unloading bridge takes the synergy of high load bearing and dynamic stability as its core principle. By optimizing the structural strength of the main beam, the accuracy of the lifting mechanism and the reliability of the electrical system, it achieves efficient loading and unloading of large-tonnage materials, adaptability to multiple working conditions and safety protection. It is widely used in port terminals, railway freight yards, steel plants and large logistics hubs. In container ports, it is used for rapid transfer between straddle carriers and yards; in the steel industry, it meets the lifting needs of heavy goods such as steel coils and ores; in railway logistics, it ensures continuous operations of bulk cargo loading and unloading. Compared with ordinary cranes, loading and unloading bridges have the characteristics of large span, high lifting height and excellent automation. They are the core equipment of heavy-load logistics system.

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

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

1. Dispute over performance indicators: the rated lifting capacity is not up to standard, and the synchronization error of the cart's movement exceeds the standard;

2. Material defects: insufficient impact toughness of the main beam steel plate, high-strength bolt pre-tightening force Deviation;

3, process problems: welding joints are not fused, track installation level deviation;

4, contract performance dispute: key configurations (such as variable frequency drive system, laser anti-collision module) are inconsistent with the technical agreement.

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

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Loading and unloading bridge quality appraisal technical methods include:

1. Appearance inspection: Check whether the surface of the loading and unloading bridge is defective, damaged, deformed, etc.

2. Dimensional measurement: Measure the various geometric dimensions of the loading and unloading bridge to see if they comply with the drawing requirements and relevant standards.

3. Structural strength inspection: Apply load to the main stress-bearing parts of the loading and unloading bridge to check whether its bearing capacity meets the design requirements.

4. Electrical system inspection: Check whether the electrical system of the loading and unloading bridge complies with safety regulations and whether there are hidden dangers such as leakage and short circuit.

05. Hydraulic system inspection: Check whether the hydraulic system of the loading and unloading bridge is working properly and whether there are leaks, insufficient pressure and other faults.

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A port group of the applicant signed a "50-ton Port Loading and Unloading Bridge Procurement Contract" with a manufacturing factory of the respondent, and it was agreed that the synchronization travel error is ≤±20mm. After being put into production, the traveling deviation of the trolley exceeded 80mm. The manufacturer argued that it was caused by the settlement of the track foundation.

identification analysis results:

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

involved in the loading and unloading bridge traveling trolley reducer gear backlash >0.3mm (agreement ≤0.15mm), encoder signal delay caused synchronization control failure; the height difference of the track joint reached 5mm (standard ≤2mm), and the horizontality deviation was 4mm/m.

The appraisal conclusion concluded that defects in the drive system and track installation errors jointly caused the deviation to exceed the tolerance.

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Loading and unloading bridge quality appraisal report should include:

1, appraisal purpose (such as safety risk attribution, performance verification) and referenced standards (GB/T 14405, ISO 8686, etc.);

2, equipment model, design drawings, acceptance records involved;

3, detection methods and equipment list (such as laser tracker, ultrasonic flaw detector);

4. Analysis of the correlation between inspection data and failure (such as the impact of gear backlash on synchronization error);

05. Clarify the conclusion and technical basis for quality responsibility determination;

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26. Signature of the appraiser, qualification certificate of lifting machinery inspector and official seal of the organization.

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