Patent Number: 
Section: claims

1. A lifting apparatus, comprising:a vertical guide device;a turntable device which is movable along the vertical guide device upwards or downwards; anda first driving device which drives the turntable device moving upwards or downwards guided by the vertical guide device,wherein said turntable device comprises:a bracket which is slidably engaged with the vertical guide device and projects perpendicularly toward a side of the vertical guide device;a turntable which is rotatably provided on an upper part of the bracket;a second driving device which is provided on a bottom surface of the bracket to rotate the turntable on the bracket; anda first radial bearing for positioning the turntable and a first thrust bearing for bearing a load of the turntable on the bracket in the vertical direction, the first radial bearing and first thrust bearing being located between the turntable and the bracket,wherein said vertical guide device comprises:a linear slide rail, an outer edge of the bracket is movably embedded with the linear slide rail to form linear constraint therebetween in a manner such that V-shape bosses are provided on the bracket and V-shape grooves mated with the V-shape bosses are provided on the linear slide rail;a lead screw which is provided in the linear slide rail, with the first driving device provided at an end of the linear slide rail to drive the lead screw to rotate; anda nut which is fixed on the bracket and engaged with the lead screw. 2. The lifting apparatus according to claim 1, wherein, an upper bearing seat and a lower bearing seat are provided at a respective end of the linear slide rail, the lead screw being engaged with the upper bearing seat and lower bearing seat. 3. The lifting apparatus according to claim 2, wherein, the lower bearing seat comprises a second radial bearing for positioning the lead screw and a second thrust bearing for bearing a load applied on the lead screw in the vertical direction. 4. The lifting apparatus according to claim 1, wherein, an outer edge of the bracket is movably embedded with the linear slide rail in a manner that a ball type linear slide bearing is provided on the linear slide rail and the outer edge of the slider bracket is provided with an embedding block connected with the ball type linear slide bearing. 5. The lifting apparatus according to claim 1, wherein, proximity switches for limiting position and protecting function are provided at the top and bottom of the linear slide rail. 6. The lifting apparatus according to claim 1, wherein, a flexible coupling is provided between an end of the lead screw and the first driving device. 7. The lifting apparatus according to claim 1, wherein, a counter bore for centrally positioning a standard sample is provided at a central place of the turntable, and a rubber pad is provided on the turntable. 8. The lifting apparatus according to claim 1, wherein, a power transmission opening of the second driving device is provided with a cable chain projecting from the guide device. 9. A safety inspection system, comprising:a lifting apparatus according to claim 1; anda CT detection device provided over the turntable device.