另外，在换辊时这个阀用来提升或降低上支承辊。
In addition, this valve is used to raise and lower the top BUR at the time of a roll change.
为了使止推块自动进出必须控制上支承辊的下降位置。
It is required for the position-controlled lowering of the BUR so that the thrust blocks can be automatically move in and -out.
本发明轴向锁紧装置与支承辊连接并安装在牌坊上部和下部的操作 侧上；
In the invention, an axial locking device and supporting rollers are connected and installed at the operation sides of the upper part and the lower part of a housing;
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