There are three common types of domestic elevator: screw type and hydraulic type.

牵引占地面积大，现在很少用于家庭使用；液压非常依赖气缸，所以气缸磨损时间长，液压油会泄漏到井，后期维护非常麻烦；一般来说，螺杆式家用电梯是非常平稳的。

Traction covers a large area and is rarely used for household use; The hydraulic pressure is very dependent on the cylinder, so the cylinder is worn for a long time, the hydraulic oil will leak to the well, and the later maintenance is very troublesome; Generally speaking, the screw household elevator is very stable.

其次，要保证电梯的平稳运行，需要每年定期进行维修。你每年少要保养一次你开的车。正常情况下是补充机油润滑油，还有一些基础检查，比如照明系统、轿厢平层、报警装置、限速器、楼层召唤等。这些安装人员会逐一给你调查。

Secondly, to ensure the smooth operation of the elevator, it needs to be repaired regularly every year. You should maintain your car at least once a year. Under normal circumstances, it is to supplement engine oil and lubricating oil, and there are some basic inspections, such as lighting system, car leveling, alarm device, speed governor, floor call, etc. These brand installers will investigate you one by one.

电梯坠落的概率只能说是完全可以忽略的。一般来说，电梯内有多个传感器和检测线来检测电梯的位置和运行速度，主板判断是否启动保护和记录运行状态。

The probability of elevator falling can only be said to be completely negligible. Generally speaking, there are multiple sensors and detection lines in the elevator to detect the position and running speed of the elevator. The main board determines whether to start the protection and record the running state.

每扇门都有一个检测点，以防止门没有关闭电梯运行。如防坠落有两个保护装置。当一个主板检测到电梯超速时，它通过电机上的制动器启动锁，使电梯停止。

Each door has a detection point to prevent the elevator from running when the door is not closed. For example, there are two protective devices for fall prevention. When a mainboard detects the elevator overspeed, it starts the lock through the brake on the motor to stop the elevator.

因此，电梯坠落事故应该是不用担心的。在上述双重保险条件下，我国这么多年来没有发生过直接坠落事故。以前的事故基本上是电梯意外移动，人们进出电梯时被切断。或者被困在电梯里盲目自救。而且，近年来电梯的标准还在不断提高。

Therefore, the elevator falling accident should not be worried. Under the above double insurance conditions, there has been no direct fall accident in China for so many years. The previous accidents were basically the accidental movement of the elevator, and people were cut off when entering and leaving the elevator. Or trapped in the elevator and blindly save yourself. Moreover, in recent years, the standard of elevator is still improving.

建议买电梯买可靠的。如果你不明白，尽量选择大的。不要太贪便宜。一分钱，一分钱，一分钱，两分钱。保修期后的维护交给厂家更好。家用电梯也可以交给政府监管，每年上门检查一次，但要收费。保证电梯里有手机信号，万一被困，打电话求助。工厂还会配备对讲机，安装在显眼的位置，经常可以尝试通话是否正常。

It is recommended to buy elevators and reliable ones. If you don't understand, try to choose a big brand. Don't be too greedy. A penny, a penny, a penny, two cents. It's better to hand over the maintenance after the warranty period to the manufacturer. Household elevators can also be handed over to the government for supervision. They can be inspected at home once a year, but they have to be charged. Make sure there is a cell phone signal in the elevator. In case of being trapped, call for help. The factory will also be equipped with walkie talkies, which are installed in a conspicuous position, and you can often try whether the call is normal.

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