Anti-freezing Transformation of Mold Temperature Control Pipeline in Low-temperature Workshops

In low-temperature workshop environments, mold temperature control circulating pipelines are prone to icing, blockage, pipe cracking and equipment failure, resulting in mold temperature imbalance, production shutdown and increased maintenance costs. The anti-freezing transformation of temperature control pipelines is a necessary technical renovation for winter stable production. Through systematic optimization of heat preservation, circulating medium, electric heating and pipeline structure, the hidden freezing risks of pipelines are completely eliminated.

1. Analysis of Original Pipeline Freezing Defects

The original temperature control pipeline has many inherent freezing vulnerabilities. The thermal insulation layer of most pipelines is thin and incomplete, with no targeted protection for elbows, valves and joints, resulting in local cold conduction and icing. Exposed overhead and wall-through pipelines lack anti-freezing measures, and stagnant water in the pipeline freezes rapidly during workshop shutdown. The single pure water circulation medium has poor low-temperature resistance, and the lack of active heating equipment leads to no effective anti-freezing protection under static shutdown conditions. In addition, unreasonable pipeline layout forms water storage dead angles, causing repeated freezing and cracking.

2. Thermal Insulation and Sealing Transformation of Pipelines

All water and oil temperature control pipelines are wrapped with high-density flame-retardant thermal insulation cotton, with thickened treatment for wall-through and exposed sections. Special molded insulation sleeves are used for valves, elbows and joints, and sealing glue is filled in gaps to eliminate cold bridge phenomenon. The outer layer is covered with waterproof aluminum skin to prevent insulation failure caused by moisture and oil pollution. Low-level pipelines are equipped with heat insulation supports to isolate ground low-temperature conduction and reduce heat loss.

3. Circulating Medium Optimization and Standardization

Pure water circulation is replaced with industrial ethylene glycol antifreeze solution, and the mixing ratio is adjusted according to the minimum ambient temperature to ensure low-temperature fluidity. Oil temperature control equipment adopts low-temperature special heat-conducting oil to reduce viscosity resistance in low-temperature environment. The antifreeze concentration is detected regularly before winter, and aging and failed mediums are replaced regularly to maintain stable anti-freezing performance.

4. Intelligent Electric Heating and Anti-freezing Design

Self-limiting temperature electric tracing tapes are laid on all low-temperature vulnerable pipelines, matched with intelligent temperature control switches. The tracing system automatically starts heating below 5℃ and stops above 10℃ to realize energy-saving and automatic anti-freezing. Partitioned independent control is adopted for centralized pipeline areas, equipped with leakage protection devices to ensure electrical safety in humid workshops.

5. Pipeline Structure Optimization and Daily Maintenance Mechanism

Drainage and emptying valves are added at the dead ends of pipelines to thoroughly drain stagnant water after shutdown. Bypass small-flow circulation pipelines are optimized to maintain medium flow and prevent static freezing during standby. The pipeline gradient is adjusted to eliminate water storage dead angles. Meanwhile, a standardized winter inspection and maintenance system is established to regularly check insulation layer, electric heating function and antifreeze concentration, forming long-term stable anti-freezing guarantee.