The pre-filer solves the problem that the used wind generated by adopting the prior art has the disadvantages of low purified degree, so that the mechanical jamming is generated in the turnover.

它解决了现有技术所存在的用风纯洁度不高，导致道岔产生 机械卡阻的缺陷。

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System stability, high anti-jamming, high precision and wind cups with special material, high mechanical strength, strong wind, display case design novel and unique, durable, easy to install.

系统稳定性高、抗干扰能力强，检测精度高，风杯采用特殊材料制成，机械强度高、抗风能力强，显示器机箱设计新颖独特，坚固耐用，安装使用方便。

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