Lifting Device

Abstract

The invention relates to a lifting device using fluid as a damping medium to form a driving force. It has an outer tube, an inner tube, a guiding assembly and a spring using fluid as a damping medium to achieve a lifting effect, one end of the inner tube being inserted in the outer tube from one end of the outer tube and being fixedly connected with the guiding assembly, a portion of the guiding assembly being in contact with the inner wall surface of the outer tube to implement rolling friction or sliding friction, one end of the spring being positioned in the outer tube, the other end of the spring penetrating through the inner tube and being connected with the inner tube

We claims: 
     
         1 . A lifting device, comprising an outer tube, an inner tube, a guiding assembly and a spring using fluid as a damping medium to achieve a lifting effect, one end of the inner tube being inserted in the outer tube from one end of the outer tube and being fixedly connected with the guiding assembly, a portion of the guiding assembly being in contact with the inner wall surface of the outer tube to implement rolling friction or sliding friction, one end of the spring being positioned in the outer tube, the other end of the spring penetrating through the inner tube and being connected with the inner tube, characterized in that the end, which allows the inner tube to be inserted, of the outer tube is connected with an oil scraping mechanism, and the inner tube penetrates through the oil scraping mechanism and is in clearance fit with the oil scraping mechanism. 
     
     
         2 . The lifting device according to  claim 1 , characterized in that the guiding assembly comprises a choke plug with one end inserted in the inner tube, the choke plug comprises an inner sleeve, an outer assembling tube, a connecting block and rolling elements, one end of the connecting block is connected to the outer peripheral surface of the inner sleeve, the other end of the connecting block is connected with the inner peripheral surface of the outer assembling tube, a groove is formed in the outer peripheral surface of the outer assembling tube, through holes are formed in the peripheral surface of the inner tube, one portion of each rolling element is positioned in the groove of the outer assembling tube, the other portion of each rolling element penetrates through the corresponding through hole of the inner tube and then is in contact with the inner surface of the outer tube. 
     
     
         3 . The lifting device according to  claim 1 , characterized in that the oil scraping mechanism comprises a rubber ring. 
     
     
         4 . The lifting device according to  claim 3 , characterized in that one end of the rubber ring is bent towards the inside of the rubber ring to form a first bent portion, and the other end of the rubber ring is bent towards the inside of the rubber ring to form a second bent portion. 
     
     
         5 . The lifting device according to  claim 3 , characterized in that the oil scraping mechanism further comprises a connecting tube, one end of the connecting tube is fixedly connected with one end of the inner tube, and the other end of the connecting tube is connected with the rubber ring. 
     
     
         6 . The lifting device according to  claim 5 , characterized in that an annular groove is formed in the inner peripheral surface of the connecting tube, a first protrusion portion which extends in the radial direction of the rubber ring is arranged on the outer peripheral surface of the rubber ring, and the first protrusion portion is embedded in the annular groove. 
     
     
         7 . The lifting device according to  claim 6 , characterized in that a second protrusion portion is further arranged on the outer peripheral surface of the rubber ring, and after the first protrusion portion is embedded in the annular groove, the second protrusion portion is abutted against the inner peripheral surface of the connecting tube.