Quality appraisal of transmission machinery and equipment

transmission mechanical equipment is based on the core principle of power transmission and load adaptation synergy. By optimizing transmission efficiency, torque fluctuation and vibration control, it achieves the synergy of power output stability, gear/bearing life and energy consumption economy. It is widely used in wind power gearboxes, ship propulsion systems, engineering machinery transmissions and industrial production line transmission fields. In wind power equipment, it is used for high-torque transmission of megawatt-level gearboxes; in heavy-duty vehicles, it meets the impact load tolerance requirements of gearboxes; in the field of precision machine tools, it ensures micron-level accuracy of spindle transmission. Compared with general transmission equipment, high-end transmission machinery has the characteristics of intelligent lubrication, fault prediction and modular maintenance, and is the core component of industrial power systems.

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

As the complexity of transmission systems increases, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: transmission efficiency does not meet the standard, vibration intensity exceeds the standard;

2, material defects: insufficient depth of gear carburized layer, bearing steel grain size;

3, process problems: tooth surface contact spots, shaft alignment deviation;

4, contract performance dispute: core modules (such as imported high-precision gear grinders, online oil monitoring systems) are inconsistent with the technical agreement.

According to the characteristics of transmission machinery and equipment, common quality identification technical methods include:

1. Appearance inspection: visually observe the appearance of the equipment to check whether there are cracks, deformation, wear and other defects.

2. Performance test: Test the performance of the equipment, such as speed, torque, power, etc., in accordance with relevant standards and technical requirements.

3. Material analysis: Use chemical analysis, metallographic analysis and other methods to analyze the materials of the equipment to determine whether the composition and performance of the materials meet the requirements.

4, non-destructive testing: Use non-destructive testing methods such as ultrasonic testing and magnetic particle testing to detect whether there are defects inside the equipment.

A wind farm of the applicant signed a "3MW Wind Power Gearbox Procurement Contract" with a gearbox manufacturer of the respondent, agreeing that the transmission efficiency is ≥97%. After being put into operation, the actual measurement was only 93%. The manufacturer argued that it was caused by excessive turbulence intensity in the wind field.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "semi-automatic equipment", contract technical agreements, on-site inspection case materials and other data, and made the following quality analysis conclusions See:

The gear carburized layer depth of the semi-automatic equipment involved in the case is 0.8mm (agreement ≥ 1.2mm), the tooth surface contact spots are 45% (agreement ≥ 70%); the high-speed shaft alignment deviation is 0.08mm/m (agreement ≤ 0.05mm/m), and the insufficient oil film thickness causes increased friction loss.

The appraisal conclusion determined that defects in material technology and assembly accuracy were the main reasons for insufficient efficiency.

Transmission machinery equipment quality appraisal report should include:

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

2, involved equipment model, technical agreement, operation and maintenance data;

3, testing method and equipment list (such as vibration analyzer, ferrograph);

4, correlation analysis between test data and failure (such as the influence of carburized layer depth on contact fatigue);