很多老板订门只报“宽×高”，师傅照着尺寸下料，装完没两个月就开始蹭边、异响、电机发烫。卷帘门不是窗帘布，它是靠导轨、卷轴、扭簧三条腿走路的机械件，测量差几毫米，受力就全歪。

Many bosses only quote "width x height" when ordering a door, and the master cuts the material according to the size. Within two months after installation, they start rubbing the edges, making abnormal noises, and the motor heats up. A rolling shutter door is not a curtain fabric, it is a mechanical component that walks on three legs: a guide rail, a scroll, and a torsion spring. If the measurement difference is a few millimeters, it will completely tilt under force.

先按用处挑结构，别全店铺一种门：

First, select the structure according to its purpose, and don't have one type of door for the entire store:

临街商铺要防撬和遥控，彩钢或铝合金帘片配外挂电机，夜间能机械锁底梁。

Street facing shops should be tamper proof and remotely controlled. Color steel or aluminum alloy curtains should be equipped with external motors, and the bottom beam should be mechanically locked at night.

小区车库图安静，用铝合金中空发泡帘片加管状静音电机，别上工业厚板，又吵又费电。

The garage in the residential area is quiet, using aluminum alloy hollow foam curtains and tubular silent motors, without industrial thick plates, which is noisy and consumes electricity.

厂房、物流口走车频繁，直接抗风卷帘或快速门，帘片基板1.0到1.2毫米、导轨加深加厚。

Frequent vehicle traffic in factories and logistics outlets, direct wind resistant rolling shutters or fast doors, curtain base plates ranging from 1.0 to 1.2 millimeters, and deepening and thickening of guide rails.

消防通道、地下车库隔断，建议防火卷帘，带烟温联动和备用落门电源，普通门顶替不过验收。

Fire exits and underground garage partitions must be equipped with fire-resistant rolling shutters, smoke and temperature linkage, and backup door power supply. Ordinary doors cannot be replaced for acceptance.

签单前把四样“里子”写进合同，比砍单价有用：

Writing four 'ins' into the contract before signing is more useful than cutting the unit price:

第一，帘片写裸板实际厚度，商铺0.8毫米起步，工业1.2毫米起步，到货拿卡尺抽测，标1.2实测0.8的太多了。

Firstly, the actual thickness of the bare board is written on the curtain, starting from 0.8 millimeters for commercial use and 1.2 millimeters for industrial use. Upon arrival, a caliper is used for sampling, and there are too many samples with a standard of 1.2 and a measured thickness of 0.8.

第二，导轨壁厚≥1.5毫米、内侧带防脱钩，济南春秋风大，没防脱钩的门被车蹭一下就脱轨。

Secondly, the wall thickness of the guide rail should be ≥ 1.5 millimeters, and the inner side should be equipped with anti decoupling measures. In Jinan, the spring and autumn winds are strong, and doors without anti decoupling measures can easily derail if they are rubbed by a car.

第三，卷轴用无缝管、壁厚≥2毫米，扭簧按门体重量算预紧力。电机只管起步，剩下全靠扭簧扛；扭簧断一根，门帘会带着底梁往下砸，非常危险，换建议整组换，别单根补。

Thirdly, the scroll is made of seamless tube with a wall thickness of ≥ 2 millimeters, and the pre tightening force of the torsion spring is calculated according to the weight of the door body. The motor only starts, and the rest is carried by the torsion spring; If one of the torsion springs breaks, the door curtain will be hit downwards with the bottom beam, which is very dangerous. It must be replaced as a whole set and not repaired individually.

第四，电机分清楚：家用220伏管状电机，工业走380伏三相，带过热保护和遇阻反弹，停电能切手动离合。

Fourth, motor separation: household 220V tubular motor, industrial 380V three-phase, with overheating protection and rebound in case of resistance, can switch to manual clutch in case of power outage.

安装和保养里非常值钱的两步：

The two most valuable steps in installation and maintenance:

导轨垂直度每米偏差不超1.5毫米，膨胀螺丝打在实心梁上，不打空心砖。

The deviation of the verticality of the guide rail shall not exceed 1.5 millimeters per meter, and expansion screws shall be installed on solid beams without hollow bricks.

每月清一次导轨石子、给链条轴承上锂基脂；遥控距离变短先换电池；门卡在半空别反复按遥控，先断电再查限位和异物。

Clean the guide rail stones and apply lithium grease to the chain bearings once a month; Replace the battery first when the remote control distance becomes shorter; The door is stuck in mid air. Don't press the remote control repeatedly. Turn off the power first and then check the limit and foreign objects.

把“厚度实测、导轨带防脱、扭簧整组换、安装看垂直”这四句钉在验收单上，同样一樘门能多安稳用好几年。

Nail the four sentences of "thickness measurement, anti detachment of guide rail belt, replacement of torsion spring assembly, and vertical installation inspection" on the acceptance form, and the same door can be more stable and used for several years.