现有的塑料破碎机的切削刀具通常采用整体式、片刀式或爪刀式，这三种形式的刀具皆以间断、瞬间、大面积切割的方式对废旧塑料进行剪切式的粉碎。其中旋转爪刀的结构一般为：在爪刀本体中部开设带有键槽的轴心通孔，在爪刀的外侧边缘设置有一个或一队斜切状刀刃，从而将旋转爪刀固装在转轴上，并使旋转爪刀的刀刃与固定刀具相对应，从而可切割和粉碎塑料。
The existing cutting tools of plastic crusher usually adopt the integral type, the slice type or the claw type. All of these three kinds of cutting tools cut the waste plastics in a discontinuous, instantaneous and large area way. The structure of the rotary claw knife is generally as follows: the center of the claw knife body is provided with an axial through hole with a key slot, and the outer edge of the claw knife is provided with a or a group of oblique cutting blades, so as to fix the rotary claw knife on the rotating shaft, and make the blade of the rotary claw knife correspond to the fixed knife, so as to cut and crush the plastic.
现有技术这种爪刀式的塑料破碎机存在的缺点主要为，塑料容易聚集到旋转爪刀的刀刃和固定刀具之间，使切削负荷大，噪音大，工作负荷的拨动显著，旋转爪刀容易这段，塑料易卡死主机，造成停机。针对现有技术存在的不足，该塑料破碎机目的在于提供一种降噪塑料破碎机，能够很好的降低由塑料破碎机带来的噪音。
The disadvantages of the existing claw knife type plastic crusher are as follows: the plastic is easy to gather between the cutting edge of the rotary claw knife and the fixed cutting tool, making the cutting load large, the noise large, the working load moving significantly, the rotary claw knife is easy to this section, the plastic is easy to block the main machine, and the machine is shut down. In view of the shortcomings of the prior art, the purpose of the plastic crusher is to provide a noise reduction plastic crusher, which can well reduce the noise caused by the plastic crusher.