(2) The overweight track, tunnel track and wide sleeper track shall be equipped with first-class ballast. Other tracks can use secondary ballast;
(3) In areas where the existing quarry products cannot provide ballast according to the provisions of the preceding article, before opening a suitable new quarry, the level of ballast use shall be specifically determined with the approval of the Ministry of Railways;
(4) Ballast grading should comply with the regulations;
(5) Needle index is not more than 50%, and flake index is not more than 50%;
(6) The mass percentage of clods and other impurities is not more than 0.5%;
(7) The mass percentage of powder with particle size below 0.65438 0 mm is not more than 65438 0%.
Yuan Wah Stone Factory in Juxian County, Rizhao City has advanced gravel processing equipment, and its products include jaw crusher and hammer crusher. After the stone is mined, it is sent to the automatic feeder by the pull-type dump truck, and then the large stone is broken into the size of sweet potato stone by the jaw crusher, and then broken into stones of various sizes by the box crusher, and then sent to the impact screen by the belt conveyor, so as to be screened into stones of various sizes you want; It has the characteristics of large crushing ratio and uniform particle size of materials.
It is widely used to prepare graded crushed stones, railway ballast stones and building aggregates for expressway and high-speed railways.