Is the bottomless elevator safe?

The bottomless pit is directly placed on the ground, and then made into a small slope with a baffle. The smallest pit is 50 mm. This bottomless elevator is widely used in the European market, usually a spiral elevator. Other types of elevators must have pits, and few people in China know about them. Screw drive is more suitable for home use, because its safety is higher than hydraulic and traction. As for maintenance, this bottomless screw elevator is about 2-4 times a year. Its cost is much lower than other types of elevators, and it is very convenient, which greatly reduces the risk of maintenance personnel. Many people who don't understand certainly don't know the benefits of this elevator. If you compare all aspects comprehensively, you will know that what others say is false.