There are various implementation schemes for providing the wave absorbing material outside the inlet of the material carrying pipeline 103. In one of the implementation schemes, the wave absorbing material is added directly outside a section at the inlet of the material carrying pipeline 103. The scheme may be implemented by changing the wall thickness of the section at the inlet of the material carrying pipeline 103 to add the wave absorbing material. For example, as shown in FIG. 5, the outer diameter d1 or the inner diameter d2 of the material carrying pipeline 103 may be changed. In the present example, a constrained diameter design scheme that keeps d1 unchanged is adopted. Another implementation manner is implemented by changing a material of a section at the inlet of the material carrying pipeline 103. For example, the material carrying pipeline 103 adopts a quartz pipeline, so that when preparing the section at the inlet of the material carrying pipeline 103, the wave absorbing material is added to obtain a material having a wave absorbing function, and the material is used to prepare the section at the inlet of the material carrying pipeline 103.