很多餐饮老板看效果图挺好看：白天伸出来遮阳，打烊收起来不挡路。结果装完第一场南风，篷布鼓成帆船；或者卷帘门拉下来蹭到电机盒。不是伸缩棚不好用，是门头这个位置有五条隐形红线，量尺时没算进去。

Many restaurant owners look good at the renderings: they stretch out for shade during the day and close up without blocking the way. After installing the first southern wind, the tarpaulin bulged into a sailboat; Or the rolling shutter door may come down and rub against the motor box. It's not that the retractable shed is not easy to use, it's that there are five invisible red lines at the entrance, which were not included in the measurement.

第一，墙面能不能吃住力。

Firstly, can the wall withstand the load.

曲臂伸缩棚所有拉力全压在两个支架上。混凝土梁、实心砖墙直接打M10膨胀栓没问题；空心砖、加气块、保温层、贴了厚瓷砖的旧门头，建议穿墙螺杆或者先焊预埋钢板。很多“用半年螺丝松脱”的事故，根子在这一步。

All tension in the curved arm telescopic shed is fully exerted on two supports. It is not a problem to directly install M10 expansion bolts on concrete beams and solid brick walls; Hollow bricks, aerated blocks, insulation layers, and old door heads with thick ceramic tiles must be threaded through the wall or welded with pre embedded steel plates. Many accidents of screws loosening after six months of use are rooted in this step.

第二，伸出长度别贪。

Secondly, don't be greedy by extending the length.

小门脸伸1.5到2.5米非常稳，宽门头分段做两组比单组伸4米靠谱。伸得越长，前端下垂越明显，风从下沿灌进来整棚兜风，墙面锚点受力翻倍。真要遮深外摆区，别硬拉长曲臂，改做导轨式推拉棚更稳。

Extending the small door face 1.5 to 2.5 meters is the most stable, and dividing the wide door head into two groups is more reliable than extending a single group by 4 meters. The longer it extends, the more obvious the front end droops, and the wind flows into the entire shed from the lower edge for a spin, doubling the force on the wall anchor points. If you really want to cover the deep outer swing area, don't forcefully elongate the curved arm, switch to a rail type sliding shed for greater stability.

第三，收拢后的净空。

Thirdly, the clearance after consolidation.

伸缩盒+卷布+电机头，收起来至少占15到20厘米高、20厘米厚。量尺时把空调管、招牌字、监控头、消防栓、卷帘门上沿全算进去。上方没空间，篷布收不回，非常后只能歪着装。

Expansion box+roll cloth+motor head, folded up to at least 15 to 20 centimeters high and 20 centimeters thick. When measuring, include all air conditioning pipes, signage, monitoring heads, fire hydrants, and the upper edge of rolling shutter doors. There is no space above, the tarpaulin cannot be retracted, and in the end, only the clothes can be worn askew.

第四，电机别只看“遥控”。

Fourthly, don't just focus on the "remote control" of the motor.

门头款每天开合好几次，电机扭矩要留余量：3米以内棚面扭矩不低于40N·m，3到5米取60到80N·m，再宽就上双臂或双电机。电机带过热保护和遇阻回停，线路穿PVC管、控制盒装室内侧，别把接线盒露在雨线里。

The front door should be opened and closed several times a day, and there should be a margin for motor torque: the torque of the shed surface within 3 meters should not be less than 40N · m, and for 3 to 5 meters, it should be taken as 60 to 80N · m. If it is wider, double arms or dual motors should be installed. The motor is equipped with overheat protection and will stop when encountering resistance. The wiring should be threaded through PVC pipes and controlled inside the box compartment. Do not expose the junction box in the rain wire.

第五，也是非常多人忘的一条：大风前收棚。

The fifth and most forgotten rule is to close the shed before strong winds.

伸缩棚是“可收放”设施，不是固定屋顶。预报5到6级风、雷阵雨、冬天下雪，手动款提前摇上去，电动款别让它迎风抖。篷布一兜水，先停机排水再收，硬拽会把曲臂拉弯。

A retractable shed is a "retractable" facility, not a fixed roof. Forecast 5 to 6 levels of wind, thunderstorms, and winter snowfall. Shake the manual version in advance, and don't let the electric version shake in the wind. A bucket of water in the tarpaulin, stop the machine to drain water first and then collect it. Pulling it hard will bend the curved arm.

顺手记三条验收动作，比砍价有用：

Memorizing three acceptance actions is more useful than bargaining:

展开收拢连续跑五次，看轨道卡不卡、限位准不准。

Expand and fold the track five times in a row to check if it is stuck and if the limit is accurate.

拿矿泉水瓶往接缝和篷面泼一次，背面不渗水再签收。

Pour a mineral water bottle onto the seam and canopy once, and sign for it only when there is no water seepage on the back.

篷布张力调“微紧不绷”，太松兜风、太紧撕边。

The tension adjustment of the tarpaulin is "slightly tight but not tight", too loose for driving, too tight for tearing the edges.

把“墙能承重、伸不长贪、收态留空、电机留扭矩、大风必收”这五句钉在量尺单上，门头那两平米才不会变成每天打烊都要骂一句的摆设。

Nail the five sentences of "the wall can bear weight, can't stretch long and be greedy, leave empty space in the closed state, leave torque for the motor, and must be retracted in strong winds" on the measuring sheet, so that the two square meters at the door will not become a decoration that requires scolding every day when closing.