A linear module is a high-precision instrument, but it often operates in low-precision environments. Contaminants like dust, liquid coolant, or metal chips are the leading causes of premature failure.

This article explains how the TOCO TGH and TGB series utilize advanced sealing technologies to maintain "Total Enclosure" protection.

1. The Stainless Steel Strip Seal

The most prominent feature of the TGH and TGB modules is the magnetic stainless steel sealing strip that runs the entire length of the actuator.

• How it works: Unlike rubber bellows that can tear or sag, this thin, flexible stainless steel band is held in place by magnetic strips along the aluminum body. As the carriage moves, it lifts the band and lays it back down behind it.

• The Benefit: It creates a near-total seal against top-down debris while maintaining a sleek, low-profile design. It is specifically designed to resist "pitting" from hot metal chips that would melt standard plastic covers.

2. Integrated Carriage Wipers

Even with a top cover, microscopic particles can attempt to enter through the sides. TOCO modules utilize a dual-layer wiping system:

1. External Scrapers: A rigid scraper that knocks away larger debris (wood chunks, heavy scale).

2. Internal End Seals: High-density synthetic rubber seals that "hug" the rail profile to wipe away fine dust and maintain the lubricant film on the internal TOCO linear guides.

3. The Role of Positive Pressure (Air Purge)

For environments with extreme fine dust (like graphite machining or ceramic grinding), a physical seal isn't enough.

• The "Air Purge" Method: TOCO modules can be equipped with an air inlet port. By pumping a small amount of clean, dry compressed air into the module, you create positive internal pressure.

• Why it works: Air constantly leaks out of the small gaps in the seals, preventing fine dust from being "sucked" in during the carriage's movement.

4. Environment Selection Guide

5. Maintenance of the Shielding System

A seal only works if it is maintained. TOCO recommends a simple three-step check:

1. Strip Inspection: Check the stainless steel band for kinks or dents that could break the magnetic "grip."

2. Seal Lubrication: A light wipe of oil on the stainless strip reduces friction against the carriage's lifting rollers.

3. Debris Clearance: Ensure that the "valleys" where the magnetic strips sit are free of accumulated magnetic dust or metal fines.

Conclusion

The longevity of your TOCO TGH or TGB module is directly tied to how well it keeps the "outside world" out.

By utilizing the stainless steel strip seal and positive pressure options, you ensure that your ball screws and linear guides stay lubricated and grit-free, even in the most demanding industrial settings.