Hot runner thermocouples are customized according to mold structure, installation space, heating position and assembly mode, forming a complete product structural classification system. Understanding different structural types helps mold designers, maintenance engineers and injection molding enterprises select matching thermocouples accurately, improve installation convenience and prolong service life. The mainstream structural types in the industry include embedded type, surface mounted type, straight rod type, bent integrated type, miniature high-sensitivity type and high-temperature flexible lead type.
Embedded thermocouples are the most widely used standard type, reserved with mounting holes on hot runner nozzles and manifolds. The probe is embedded inside the heating sleeve, closely contacting the heating zone with fast heat conduction and accurate temperature measurement. This structure is firm and stable, not easy to be affected by external mold clamping force, suitable for most standard single-point and multi-point hot runner systems, and favored by mainstream international and domestic hot runner brands for original matching.
Surface-mounted thermocouples are designed for old molds and special structures without reserved mounting holes. The probe fits closely on the outer wall of nozzle or manifold through high-temperature heat-conducting gaskets, featuring simple installation, no need to modify mold structure and strong universality. It is commonly used for hot runner renovation, mold maintenance and non-standard customized molds. Bent integrated thermocouples adopt one-piece bending design, adapting to narrow mold wiring space and complex corner layout, avoiding lead breakage caused by repeated mold opening and closing bending.
Miniature thermocouples are developed for micro hot runner nozzles, thin-wall precision parts and medical ultra-small cavity molds. With ultra-fine probe diameter and ultra-short sensing end, it can adapt to compact installation space, fast temperature response and high measurement accuracy, meeting the ultra-precision temperature control requirements of 3C electronics and medical industry. High-temperature flexible lead thermocouples adopt high-strength bending-resistant sheath and high-temperature resistant insulation material, suitable for frequent movement, high bending frequency and harsh high-temperature radiation environment, effectively preventing lead aging and fracture.
Each structural type has its own applicable working conditions and installation specifications. Professional hot runner supporting manufacturers will select corresponding thermocouple structure according to mold drawing, nozzle model, manifold size and customer installation habit, realizing perfect matching between temperature sensing components and hot runner system.
