热芯盒射机芯上的射头附加板,一般都用螺钉固定在水冷射板上,更换芯盒时也必须更换附加板,既费时间又不方便。为了方便操作、提高工效,天津拖拉机厂铸铁车间自制成功一种燕尾形的射头附加板(见图),于一九八○年十月份开始在ZZ863、Z8612B、ZZ Hot core cartridge shot on the movement of the additional board, usually with screws fixed on the water-cooled board, the replacement of the core box must also be replaced when the additional board, both time-consuming and inconvenient. In order to facilitate the operation, improve work efficiency, Tianjin tractor factory made a successful dovetail-shaped cast iron shop additional board (see photo), in October 1980 began in the ZZ863, Z8612B, ZZ