After adjustment, the hoist is locked in place using fasteners to ensure it does not loosen under conditions of vibration or pressure changes. The specific securing method depends on the type of hoist. Here are some common types:
Screw-type Hoist (e.g., American, German type): After adjustment, the screw and nut form a self-locking structure, maintaining the position through thread friction. To enhance anti-loosening performance, a small amount of anti-loosening adhesive can be applied to the threads or a spring washer can be added to prevent loosening due to long-term vibration.
Worm Gear Hoist (Stepless Hoist): After rotating the worm gear to the appropriate tightness, its internal worm wheel mechanism has a self-locking characteristic, effectively preventing springback and loosening. During installation, ensure the toothed part is on the tightening side and apply force evenly using a tool to avoid slippage caused by uneven force.
Spring Hoist / Disposable Hoist: This type of hoist relies on material elasticity or permanent deformation locking after being pressed with a special tool. For example, stepless clamps use pneumatic calipers to clamp the lugs, causing the steel strip to retract and engage for secure installation. Once installed, they cannot be disassembled or reused, and their position is naturally locked.
Multi-bolt clamps (such as grooved clamps) require tightening the bolts step-by-step in a diagonal sequence to the specified torque after adjustment. This distributes pressure evenly across multiple tightening points, achieving stable fixation. It is recommended to use a torque wrench to control the force, avoiding overtightening which could damage the sealing ring or undertightening which could lead to leakage.
