1. Ceiling-Mounted Connection

This is a common method for installing devices or components on ceilings. For example, the hanger of a ceiling fan includes a ceiling plate positioned on the ceiling and a ceiling connection tube attached to it. The bottom of the connection tube is securely connected to the matching device at the hanging head of the fan's upper cover via locking screws. Some connection tubes have inward-folded edges with threaded holes, aligning with corresponding holes on the hanging head for screw fixation. A more convenient variant involves upper cover hanging heads with at least two protruding half-recessed screws. The connection tube's folded edges feature keyholes (large on one end, small on the other); the tube is positioned by inserting the screws into the keyholes and rotating to lock in place.

2. Chassis Locking

Common chassis locking methods include hole-drawing riveting, rivet riveting, and TOX riveting.

• Hole-drawing riveting: One part has a drawn hole and the other a countersunk hole. They form a non-detachable joint via a riveting die, offering high positioning accuracy, strong connection strength, and fast assembly speed.
• Rivet riveting: Uses blind rivets to fasten two metal sheets together.
• TOX riveting: A punch presses the workpiece into a die; further pressure forces material in the die to expand outward, creating a smooth, burr-free circular joint without compromising corrosion resistance.

3. Screw Locking

The most widely used connection method, securing components with screws. To ensure reliability and prevent loosening:

• Use self-locking nuts (e.g., nylon-insert lock nuts) that leverage nylon expansion to generate reverse pressure when tightened.
• Adopt mechanical anti-loosening measures such as split pins, spring washers, or double nuts.
• Follow specific tightening procedures: For rectangular workpieces, start from the center and move symmetrically outward; for square/circular workpieces, tighten diagonally. Install all screws first, then gradually tighten in steps to avoid structural deformation or poor contact.