Quality appraisal of theodolite

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theodolite takes the synergy of precision angle measurement and axis system stability as its core principle. By optimizing the magnification of the telescope, the verticality of the horizontal axis system and the resolution of the electronic angle measurement system, it achieves the synergy of horizontal and vertical angle measurement accuracy, automatic compensator range and data storage capacity. It is widely used in fields such as construction engineering, topographic surveying and mapping, mine surveying and railway track laying. In high-rise buildings, it is used for accurate transmission of construction axes; in mine tunnels, it meets the high-precision requirements for penetration measurement; in railway construction, it ensures rapid detection of track smoothness. Compared with traditional optical theodolite, electronic theodolite has the characteristics of automatic data collection, strong environmental adaptability and high functional integration, and is the core tool for accurate engineering measurement.

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

As the requirements for surveying and mapping accuracy increase, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: angle measurement accuracy exceeds standard, compensator range is insufficient;

2, material defects: shaft system material hardness is insufficient, optical lens transmittance;

3, process problems: vertical axis clearance is too large, automatic compensator zero drift;

4, contract performance dispute: core modules (such as absolute encoder brand, laser plummet power) are inconsistent with the technical agreement.

0 Such cases require angular accuracy calibration, shaft system stability testing and optical system analysis to clarify the quality responsibility.

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Theodolite quality appraisal mainly includes the following technical methods:

1. Appearance inspection: Check the appearance of the theodolite for scratches, dents, damage and other defects.

2. Function test: Check whether the horizontal angle and vertical angle measurement functions of the theodolite are normal and whether there are errors.

3. Accuracy test: In accordance with the standard regulations, perform an adjustment test of the theodolite, measure the horizontal angle and vertical angle accuracy of the theodolite, and obtain its measurement accuracy value.

4. Structural analysis: Analyze the structure of the theodolite and check whether its internal parts are intact and whether there are problems such as looseness and falling off.

05. Cause analysis: Based on the above test results, the reasons for theodolite quality defects are analyzed, which may be design defects, poor manufacturing process, improper use and other factors.

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A surveying and mapping institute of the applicant signed a "1" Class Electronic Theodolite Procurement Contract with an instrument manufacturer of the respondent, agreeing that the angle measurement accuracy is ±1". During use, it was found that the closing error of the bridge control network exceeded the limit. The manufacturer argued that it was caused by on-site vibration interference.

identification and analysis results:

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

The vertical axis clearance error of the theodolite involved in the case was 3.5″ (agreement ≤ 2″), the compensator zero drift was 2″/hour (agreement ≤ 1″); the HRC of the shafting material was only 55 (agreement ≥ 60), resulting in increased bearing wear.

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

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Theodolite quality appraisal report should include:

1, purpose of appraisal (such as angle measurement error attribution, performance verification) and cited standards;

2, model of the instrument involved, factory number, calibration record;

3, testing method and equipment list (such as multi-camera Standard calibration bench, spectrophotometer);

4, analysis of detection data and failure correlation (such as the impact of shafting clearance on backlash error);

05, clarify the quality responsibility judgment conclusion and technical basis;

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26, signature of the appraiser, qualification certificate of surveying and mapping engineer and official seal of the organization.

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