1.      Workpieces should be put within the range of impacting districts which can enhance cleaning efficiency and lower abrasion of guarding plate to prolong its service life.

2.      If workpieces can not be added, directional jacket should be adjusted so that steel sheet piling can be mostly thrown onto workpieces to prolong service life of guarding plate and lower abrasion.

3.      ① Strobes at different branches of dust catching system should be adjusted to evenly distribute wind power to enhance dust catching effect.