How to Daily Maintain Hot Runner Thermocouples to Extend Service Life?

The service life of hot runner thermocouples can be increased, failure rates can be decreased, and enterprise accessory procurement costs can be reduced with daily scientific maintenance and standardized use. The maintenance work must be incorporated into daily production, shutdown maintenance, and seasonal inspection links. First and foremost, abrupt high-temperature heating and abrupt cooling operations on the hot runner system are strictly prohibited in everyday production use. Thermocouple internal core wires will experience significant thermal expansion and contraction due to rapid temperature changes, which can easily result in internal wire breakage and hasten probe aging. To lessen the thermal damage to thermocouples, the step-by-step temperature rise and gradual cooling operation standard must be implemented.

Every shift, production operators must check the temperature display data of each hot runner zone in the daily production inspection link, compare it with the actual temperature measured by portable infrared temperature measuring devices, promptly identify thermocouple temperature drift and inaccurate detection issues, and calibrate the data. In order to prevent signal interruption faults, simultaneously check if the thermocouple connecting wires are worn, extruded, and loose in wiring. Then, quickly secure the loose wiring terminals. Adjust the hot runner set temperature gradually when substituting injection molding raw materials with varying temperature grades, and avoid allowing the thermocouple to operate in an extreme temperature state that is outside of its rated range for extended periods of time.

During routine shutdown maintenance, turn off all of the hot runner temperature control system's power sources, wait for the hot runner to reach room temperature, and then remove each thermocouple individually for a thorough examination. In order to avoid scratching the probe's anti-corrosion coating and harming the sensing core, it is strictly forbidden to scrape and polish the probe's surface using hard, sharp equipment. Instead, use gentle cleaning tools to remove any remaining debris and plastic carbon deposits. Examine the probe for oxidation, deformation, and corrosion, and promptly replace the thermocouples that are extremely old and have failed. Avoid direct high-temperature baking, apply anti-high-temperature protective sleeves to the wires close to the heating region, and evenly sort and tie the dispersed thermocouple connection wires.

Sort and count spare thermocouple accessories to make sure there are enough spare parts on hand, eliminate temperature detection mistakes, and perform unified precision calibration for all hot runner thermocouples as part of the quarterly comprehensive maintenance work. To prevent moisture oxidation of the internal core wires, hot runner thermocouples that have been idle for an extended period of time should be kept in a dry, dust-proof environment. Additionally, improve on-site workers' operational skill training, standardize thermocouple installation and disassembly procedures, and prevent human error during maintenance. It is possible to achieve whole-cycle management of hot runner thermocouples, effectively extend the overall service life of accessories, and guaranty the long-term stable and effective operation of hot runner production systems by creating a comprehensive thermocouple maintenance log that records the use, calibration, and replacement times.