Combination screws and socket head cap screws are common connecting components in the mechanical field, widely used for fixing and connecting various equipment and structural parts. The stability of their connection directly affects the safe operation of equipment. To effectively prevent screw loosening and avoid equipment failures, the following handling methods can be adopted, which can be flexibly selected according to actual scenarios:
1. Use thread locker: When assembling screws, evenly apply an appropriate amount of thread locker (such as thread locking adhesive) on the thread surface. Thread locker can effectively increase the friction and damping effect of the thread contact surface, fill the thread gap, and form a firm bonding force after curing, which can significantly improve the anti-loosening performance. It is especially suitable for scenarios subject to vibration and impact, and can effectively prevent screw loosening.
2. Use elastic washers: Install elastic washers (such as spring washers, wave washers) between the screw head and the connected part. They can not only provide additional preload, but also absorb impact and vibration through their own elastic deformation when the equipment vibrates or the load fluctuates, compensating for the loosening amount of the screw caused by vibration, thereby preventing screw loosening. It should be noted that the washer specification must match the screw size to avoid affecting the anti-loosening effect due to mismatched washers.
3. Apply lock nuts: Select special lock nuts for use. Lock nuts are specially designed with anti-loosening functions. They usually integrate elastic washers and embedded locking structures (such as nylon locking rings, serrated locking threads) inside. After tightening, they can closely engage with the screw threads, greatly increasing the friction and locking force between the threads, and structurally eliminating screw loosening. They are suitable for scenarios with high anti-loosening requirements.
4. Apply reasonable preload: When tightening screws, apply an appropriate preload (which must match the screw performance grade and the requirements of the connected part). This can increase the tightness of the thread contact surface, improve the overall tightening strength, and reduce screw loosening caused by vibration and load changes during equipment operation. It should be noted that the preload should not be too large to avoid tensile deformation or slipping of the screw shank; nor should it be too small, otherwise the anti-loosening effect cannot be achieved.
5. Regular inspection and maintenance: Regularly inspect and maintain the screw connection parts, check the tightening status of the screws, whether there is loosening, rust, etc., to ensure that the screw preload meets the requirements; timely tighten the loose screws, and replace the severely rusted or deformed screws in a timely manner to prevent loosening problems from the daily maintenance level.
It should be particularly noted that the selection of anti-loosening methods must be determined according to the specific application scenario, equipment working conditions (such as vibration intensity, load size, service environment) and requirements. A single method can be used alone, or multiple methods can be combined (such as "thread locker + elastic washer", "lock nut + preload") to achieve the best anti-loosening effect and eliminate equipment failures caused by screw loosening.
