In this paper,the principle,the operating charcteristic of the selvedge device of plan- etary gearon jet loom have been analyzed and calculzted,and also the main parameters' seffects of motion have been discussed.

In order to avoid the accident caused by the power switch contacts by mistake to turn on when two separate sub-paragraph bus of the mine power supply system works by tier,the interlocking device of mine flameproof high-voltage general entry and contact switch is adopted.

Roller and push-rod locking device in event of cable breakage and the design criterions;

The design of the locking device ensured the mould locking reliability and thus ensured the product quality.

In this paper,a new type of roller and pushingrod locking device for cable breaking with ingenious structure was brought out.

Various types of the fluid viscous devices widely used in bridge constructions both domestically and internationally, such as lock-up devices, fluid viscous dampers, fuse dampers, limited displacement dampers and friction viscous dampers, are introduced.

The design of locking device is one of the difficult points in the whole design of mechanism with alternating motion.