皮带护罩 meaning in English

belt cover
belt guard

Attach belt cover 2 on the arm and the support
把皮带护罩2安装到机架和支柱上。
Attach belt cover support 1 on the arm
把皮带护罩支柱1安装到机架上。
Place bobbin winder 3 in the belt cover , and position it so that it does not contact the machine arm or the belt cover before fixing it with wooden screws
把绕线装置3放到皮带护罩里，调整到不接触机架和皮带护罩的位置，然后用木螺丝进行固定。