Shutter shield in space and without strict protection, shutter shield instead of the other guard. The installation can be horizontal, vertical or any mixed direction. Small footprint, large travel speed, no noise, long life, is an ideal protective components. The structure of the product mainly by the housing (that is, a stainless steel plate, which is the so-called 1Cr13, there is a cold plate of A3), the spring shaft, the driven shaft, the tongue scraping, nylon fiber cloth that is three anti-cloth and other components, with adjustment devices, adjustable elastic, single-spring, double spring two options for users. Such protective belt can be divided into the box and bracket in the form of two installation.