Table of Contents
Skidding invention relates to lifting devices used in mechanical engineering for leveling different objects, e.g. slewing devices, assemblies repair of oil, gas wells, aircraft and the like, in which there is a need for fixation with sufficient accuracy for any portion of lift stroke and for an unlimited time. The technical result of the present invention is to increase the reliability. According to the invention, in the hydraulic lift, the support is connected to the power jacket with the possibility of axial movement and rigidly fixed to the ring plunger. There is a detail that is located on the side of one of the side surfaces of the ring plunger with the possibility of pressing the support through an adjusting pad located on the side of the other surface of the plunger to the inner collar of the cage. In addition, the support, stem, and power jacket are connected by means of a keyed connection.
Fixation of the rod at any point occurs due to the rotation of the screw by an auxiliary hydraulic cylinder mounted on the cover of the hydraulic jack, provided that the screw threads are between the threaded protrusions. In the event that the threaded protrusions of the screw abut against the threaded nuts, the stem locking can occur only after the exhibition of the protrusions of the screw between the projections of the nut by using additional means specially made for this purpose and installed inside the hydraulic jack.
The disadvantage of the known hydraulic jack is low reliability, as well as the complexity of the design, due to the need for an additional tool for the exhibition of screw threads and nuts during the locking.
The hydraulic lift contains a power jacket, a rod with multi-threaded threads, a hydraulic system, and a rod-locking device. The stem locking device consists of a nut with a thread and end splines, an annular plug with ball bearings and collars for breaking the nut with a support, a spring creating a slotted engagement of the nut with the support of the outer cylinder.
- However, this hydraulic lift does not have sufficient reliability:
- because of the rapid wear of the splines
- due to the possible failure of the command to lower the load
- because of the presence of a manual exhibition of the setscrew with a supporting head.