The automatic stretching and sealing transfer machine is designed to complete the final manufacturing stages of tubular heating elements, integrating dimensional calibration, end preparation, MgO filling control, sealing, and electrical testing into a single automated production cycle.

The workstations are synchronized by a transfer system that automatically moves each heating element throughout the entire manufacturing process, ensuring continuous operation, high precision, and outstanding process repeatability.

The stations include:

• High-capacity loading unit: a high-capacity flight-bar loader, combined with manipulators, feeds the elements and places each one precisely into the stretching station
• Stretching-to-length unit: stretches the element to its final calibrated length
• Centering unit: aligns and positions each element for accurate downstream processing
• Pin cut-to-length unit: crops the terminal pin to the required length
• Cut inspection unit: verifies that each pin cut meets the specified quality and dimensional standards
• Chamfering unit: chamfers the pin end by roll-forming, for smooth pins (consistent with the other transfers)
• MgO depth measurement unit: a probe measures the depth of the magnesium oxide fill, checking the consistency of the fill level produced by the filling machine
• MgO leveling unit: a pneumatic hammer-type tool removes excess oxide, bringing the fill level to the same value across all elements
• Sealing unit: sprays a silicone-based sealant inside the element to protect it against ambient moisture, then cuts a PTFE seal from a continuous Teflon cord and inserts it to complete the seal
• End tapering unit: deforms the element ends after the PTFE seal is fitted, locking it mechanically in place
• Electrical testing unit: performs dielectric strength (hi-pot) and ohmic value tests
• Automatic unloading unit with scrap sorting :unloads finished elements and separates rejects into two bins, mechanical and electrical