Embedded safety elevator

An embedded safety elevator, comprising:

• a van body, a motor, a driving wheel, a transmission rod, an embedded elevating device and an inwardly concave spiral guide rail;
• wherein:
• the embedded elevating device is embedded in the inwardly concave spiral guide rail for moving up and down along the inwardly concave guide rail;
• the embedded elevating device is fixed to the van body for driving the van body to move up and down;
• the motor is mounted on the van body and connected with the driving wheel, the driving wheel is connected with the transmission rod, the transmission rod is connected with the embedded elevating device;
• the embedded elevating device comprises a cylindrical spiral, a transmission joint and a fixed support, wherein the cylindrical spiral has an overall cylindrical structure, an external screw thread is provided at an external surface of the cylindrical spiral, the transmission joint is fixed at an upper portion of the cylindrical spiral and engaged with the transmission rod, wherein the cylindrical spiral is fixed on the van body via the fixed support;
• there are three embedded elevating devices, one of the embedded elevating devices is located at a middle portion of a first side wall of the van body, two of the embedded elevating devices are respectively located at two corners of a second side wall opposite to the first side wall;
• a cross section of the inwardly concave spiral guide rail is semicircular;
• an internal screw thread, corresponding to the external screw thread which is provided at the external surface of the cylindrical spiral, is provided at an inner wall of the inwardly concave spiral guide rail;
• wherein the elevator further comprises a guide rail bracket fixedly connected with an external wall of the inwardly concave spiral guide rail;
• there are a plurality of inwardly concave spiral guide rails sequentially connected with each other.