What This Category's Data Looks Like
Construction machinery intelligent due diligence report data mainly comes from manufacturer factory technical manuals, equipment operation and maintenance ledgers, third-party quality inspection reports, transaction contracts, and industry compliance documents. The rate of data updates changes with the equipment lifecycle. Factory documents are released in fixed batches. Operation and maintenance logs are updated cumulatively over the equipment service cycle. Transaction contracts are generated as needed. Most document structures include standardized technical parameter pages, time-ordered maintenance records, and columnar compliance inspection forms. Core fields include rated lifting capacity (unit: ton), engine power (unit: kilowatt), cumulative operating hours (unit: hour), hydraulic system rated pressure (unit: megapascal), and more. Some documents include identifying information such as equipment serial numbers and manufacturing dates.
What Constraints Do These Characteristics Impose on Document Parsing and Chunking
The structured nature of construction machinery due diligence data requires that parsing and chunking preserve the association between parameters and their parent modules. For example, group rated lifting capacity and engine power into the power system chunk, and avoid splitting them into unrelated global chunks. Time-series operation and maintenance logs must be split by natural cycle or equipment inspection nodes, and avoid merging cross-period maintenance records. Columnar compliance inspection forms must retain the correspondence between column titles and inspection values, to prevent loss of the binding between fields and results after chunking. Some documents have mixed unit symbols. Parsing must unify unit identifiers, and chunking must retain the original unit labels of fields, to avoid unit confusion in subsequent due diligence analysis. For long documents such as annual operation and maintenance ledgers exceeding 1,000 pages, split the chunking scope by equipment subsystems to reduce the redundancy of individual chunks.
Configuration Settings
| Configuration Item | Recommended Approach | Rationale |
|---|---|---|
chunk_size | 800–1200 characters | Structured parameter blocks for construction machinery are mostly short entries. Chunks that are too long will cause loss of parameter associations, while chunks that are too short will split parameter groups from the same module |
chunk_overlap | 100–150 characters | Operation and maintenance logs have continuous timelines. Overlapping sections preserve contextual associations and avoid cross-chunk time node breaks |
parse_table_mode | Retain column title binding | Compliance inspection forms have a strong association between column titles and inspection values. Splitting them will lose the corresponding relationship |
PARSE_FILE_TIMEOUT_SECONDS | 300–600 seconds | Large construction machinery factory manuals are mostly multi-page PDFs, which take a long time to parse. Timeouts will cause file parsing failures |
max_chunk_per_file | Calibrated based on actual testing | Document page counts vary widely across different equipment. The upper limit of the total number of chunks per file must be adapted to avoid chunk overflow |
enable_unit_normalize | Enabled | Mixed unit symbols exist in some documents. Unifying units reduces matching errors in subsequent retrieval |
The parameter values provided on this page are common recommended starting points for configuration. Actual values are affected by material form, data volume, and business rules. Specific issues require individual analysis. It is recommended to test on your own samples before finalizing settings.
Three Common Mistakes
- Phenomenon: Parent-child chunk association between parameters and their parent modules is not implemented. Precise recall of all parameters from the same module during retrieval is not possible. Cause: The
enable_parent_child_chunkconfiguration is not enabled, orchunk_sizeis not set to a length adapted to structured parameter blocks. - Phenomenon: The returned text received by the front end is unformatted plain text, and the correspondence between column titles and values of compliance inspection forms cannot be restored. Cause:
parse_table_modeis not configured to retain column title binding mode, causing table content to be split into unordered text. - Phenomenon: When batch uploading multiple large factory manuals, some files fail to parse and return the
ETIMEDOUTerror code. Cause: ThePARSE_FILE_TIMEOUT_SECONDSparameter is not adjusted to a value adapted to long documents. The default timeout threshold is insufficient to complete parsing.
How to Confirm Proper Configuration
- Upload a typical construction machinery factory manual document, check the chunk preview interface, and confirm that parameters from the same module are not split across chunks.
- Parse a compliance inspection form document, and check whether the chunking result retains the binding relationship between column titles and corresponding inspection values.
- Batch upload multiple documents of different sizes, check the task queue status, and confirm that the parsing time per file does not exceed the preset
PARSE_FILE_TIMEOUT_SECONDSthreshold. - After enabling the unit normalization configuration, check whether the units in the chunking result are unified to standard formats, such as unifying "kW" to "kilowatt".
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.