The utility model discloses a locking device for air doors, and the utility model is arranged in a drift between the two air doors of a shaft.
本实用新型公开了一种安装在矿井两道风门之间巷道内的风门闭锁装置。
The utility model relates to a hollow shaft magnetic fluid sealing device of a non-locking device used for a single crystal silicon furnace and silicon chip furnace equipment.
本实用新型涉及一种用于单晶硅炉、硅芯炉设备的无锁紧装置的空心轴磁流体密封装置。
Owing to the movable disc and the locking device, the paper roll shaft with the position limit device can be adjusted according to the width of the paper roll, thus being extremely convenient;
由于本发明的带有限位装置的纸卷轴通过设置移动式圆盘和锁紧 装置，能根据纸卷的宽度调节，非常方便；
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