It consists of a circular support frame mounted on to the back plate.
它由安装在底板上的圆形支撑框架组成。
Advantage: frame can open, make replacing hammer head, back plate and lining board work easier.
优势：机架可以开启，使得更换锤头、反击板及衬板的工作更加简便易行。
Advantage: frame can open, make replacing hammer head, back plate and lining board work easier.
优势：机架可以开启，使得更换锤头、反击板及衬板的工作更加简便易行。
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