买卷帘门时，很多人会盯着帘片厚度——“0.5mm的比0.4mm的结实”。但门装上去之后，决定它能不能用十年的，往往不是帘片，是导轨。

When buying a rolling shutter door, many people will focus on the thickness of the curtain - "0.5mm is stronger than 0.4mm". But after the door is installed, it is often not the curtain that determines whether it can be used for ten years, but the guide rail.

导轨是卷帘门的“骨头”。 帘片再厚，如果导轨太薄，门体运行时会晃动、脱轨，甚至整扇门卡在半空。导轨的材质和厚度比帘片更值得关注：不锈钢或铝合金导轨，壁厚至少1.2mm，内侧有耐磨涂层。薄导轨用不了几个月就会出现变形，帘片在歪斜的轨道里摩擦，噪音越来越大，非常后卡死。

The guide rail is the "bone" of the rolling shutter door. No matter how thick the curtain is, if the guide rail is too thin, the door will shake, derail, and even get stuck in mid air during operation. The material and thickness of the guide rail are more noteworthy than the curtain: stainless steel or aluminum alloy guide rail, with a wall thickness of at least 1.2mm and wear-resistant coating on the inner side. The thin guide rail will deform within a few months, and the curtain will rub against the skewed track, making increasing noise and eventually getting stuck.

帘片的“连接方式”比厚度更重要。 帘片之间通过铰接连接，连接方式分“插入式”和“卡扣式”。插入式是帘片边缘互相咬合，连接紧密、受力均匀，不易松动。卡扣式靠弹性卡扣固定，成本低但长期使用后卡扣会松脱，门体出现缝隙。选门时用手掰一下帘片连接处，插入式的几乎掰不动，卡扣式的能感觉到轻微旷量。

The "connection method" of the curtain is more important than its thickness. The curtain pieces are connected by hinges, and the connection methods are divided into "insertion type" and "buckle type". Insertion type refers to the interlocking of the edges of the curtain, which is tightly connected, evenly stressed, and not easily loosened. The buckle type is fixed by elastic buckles, which is low-cost, but after long-term use, the buckle will loosen and there will be gaps in the door body. When selecting the door, use your hand to break the connection of the curtain. The plug-in type can hardly be broken, while the buckle type can feel a slight looseness.

卷轴的直径决定“能不能扛住”。 卷轴要承受整扇门的重量，直径太小的卷轴在长期荷载下会弯曲变形。规范建议镀锌钢管或不锈钢管卷轴，直径≥80mm，壁厚≥2mm。卷轴弯了，门体就会一边高一边低，电机负荷提升，故障率直线上升。

The diameter of the scroll determines whether it can withstand it. The scroll needs to bear the weight of the entire door, and a scroll with a diameter that is too small will bend and deform under long-term load. It is recommended to use galvanized steel or stainless steel pipe reels with a diameter of ≥ 80mm and a wall thickness of ≥ 2mm. If the reel bends, the door body will be raised on one side and lowered on the other, increasing the motor load and the failure rate in a straight line.

一个容易被忽略的细节：防脱轨设计。 导轨内侧如果没加装防脱钩，门体在受到外力（比如车辆碰撞、大风）时可能脱出轨道。防脱轨装置的成本很低，但很多低价门会省略这一步。选门时问一句“导轨有没有防脱钩”，比问“帘片多厚”更能看出产品的用心程度。

An easily overlooked detail: anti derailment design. If anti decoupling is not installed on the inner side of the guide rail, the door may detach from the track when subjected to external forces such as vehicle collisions or strong winds. The cost of derailment prevention devices is very low, but many low-priced doors omit this step. When choosing a door, asking 'Is the guide rail anti unhooking?' is more indicative of the product's level of care than asking 'How thick is the curtain?'.

帘片厚度是“面子”，导轨、卷轴、连接方式是“里子”。面子看得见，里子决定寿命。选卷帘门，先看里子撑不撑得住面子。

The thickness of the curtain is the "face", while the guide rail, scroll, and connection method are the "inside". Face is visible, and inner strength determines lifespan. When choosing a rolling shutter door, first check whether the inside can hold up the face.

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