What the data for this category looks like
Daily documents for ready-mixed concrete production include mix design notices, batch opening certifications, production and delivery slips, raw material inspection records, test block records, strength reports, and others. Data sources include engineering orders, sand, gravel, cement, and admixture inspections, moisture content tests, mixing station control systems, and project testing laboratories. Update frequency follows per-vehicle production records, per-batch raw material inspections, and daily testing laboratory ledger updates. Document fields include raw material ratio parameters, measured moisture content values, mixing parameters, transportation time, test block strength indicators, and more. Units include kilograms per cubic meter, hours, megapascals, and others.
What constraints these characteristics impose on the "document parsing and chunking" workflow
High-frequency updated single-vehicle production records coexist with bulk raw material inspection documents. Chunking logic must distinguish between long-cycle ledgers and short-cycle real-time records. Most document fields are professional engineering parameters. Field associations must be retained to avoid splitting critical information such as mix ratios or strength values. Each vehicle’s production record has a small file size but a large total volume, so the workflow must adapt to efficiency constraints of batch parsing. Long documents such as batch opening certifications must retain cross-paragraph process logic connections, and should not be split excessively. Fields with measured units like moisture content and strength must avoid being truncated across chunks, to ensure complete parameters during retrieval. Abnormal report documents must be linked to traceability information of original production records, and inter-document association identifiers must be retained during chunking.
How to configure the workflow
This article is written based on FastGPT v4.17.0.
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Adapts to the professional parameter density of ready-mixed concrete production documents, avoids including incomplete mix ratio or strength information in a single chunk |
chunkSplitter | By paragraph + semantic boundary | Retains the correlation between process flows and parameters, avoids splitting that disrupts the logical structure of batch opening certifications and test block records |
customPdfParse | Enable text layer priority mode | Adapts to PDF production slips exported from mixing stations, prevents embedded text from being misidentified as scanned images which would cause parsing failures |
PARSE_FILE_TIMEOUT_SECONDS | 300 seconds | Adapts to the parsing duration of long documents such as annual strength reports, prevents parsing processes from being interrupted due to timeout |
UPLOAD_FILE_MAX_SIZE | 100 MB | Covers the upload requirements for large-volume documents such as single-batch raw material inspection reports and monthly ledgers |
chunkSettingMode | Manual configuration | Adjust chunking parameters for different document types (production records / inspection reports) to adapt to the association needs of professional fields |
Three common configuration mistakes
- Symptom: After uploading a mix design notice PDF, no results are returned in knowledge base searches. Cause: The text layer priority mode for
customPdfParsewas not enabled. The embedded text layer of the PDF exported from the mixing station was misidentified as a scanned image, leading to parsing failure. - Symptom: When bulk uploading daily ledger PDFs, some files fail parsing due to timeout. Cause: The value set for
PARSE_FILE_TIMEOUT_SECONDSis too low, and does not adapt to the parsing duration of long ledger documents. - Symptom: After uploading a single-vehicle production record, the chunking result truncates the moisture content correction parameter. Cause: The
chunkSizesetting is too small, splitting consecutive paragraphs containing mix ratio correction logic into multiple chunks, disrupting parameter associations.
How to verify correct configuration
- Upload a single batch opening certification PDF, check that the parsed text blocks retain complete mix ratio and mixing parameter paragraphs, with no critical information truncated across chunks.
- Bulk upload 10 documents of different types, confirm that all files have completed parsing with no timeout or parsing failure log prompts.
- Conduct search tests, input professional keywords such as "sand and gravel mix ratio" and "test block strength", confirm that the returned results contain complete corresponding fields and parameters.
- Upload a single frequently updated production and delivery slip, check that the number of chunks adapts to the document length, with no excessive splitting or merging.
The values listed here are common starting points. Adjust them based on your own sample documents.