129results about How to "Strong torsion resistance" patented technology

The invention discloses a steel pipe concrete sleeper suitable for ballastless tracks, which comprises two or more sleeper concrete blocks and a sleeper connecting piece for connecting the sleeper concrete blocks, the sleeper concrete block is in a block structure, and is made of concrete It is made by pouring, and there are embedded parts for fixing the rails and steel mesh or stirrups connecting the sleeper connectors; the sleeper connectors are composed of a plurality of hollow steel pipes arranged horizontally between the concrete blocks of the sleeper. During the block pouring process, the hollow steel pipe is filled with concrete at the same time to form the concrete filled steel pipe, and then the sleeper connector and the concrete block of the sleeper are poured into one body. In the invention, the concrete-filled steel tube is applied in the concrete sleeper of ballastless track, the concrete-filled steel tube is used as the connector of the sleeper block, and the concrete-filled steel tube and the concrete block of the sleeper are integrally formed, so as to effectively increase the geometric shape and position retention capacity of the sleeper, reduce the amount of steel, and have the advantages of simple preparation , Strong constructability and so on.

The invention discloses sliding block mechanisms which are respectively used on a thrice quartered variable-pitch louver and a double dichotomy variable-pitch louver and a variable-pitch louver sliding block system with one of the two sliding block mechanisms. The variable-pitch louver sliding block system comprises gear torsion spring clutch turnover mechanisms, a base and a top cover, wherein the sliding block mechanisms are tightly adjacent to the gear torsion spring clutch turnover mechanisms, the sliding block mechanisms and the gear torsion spring clutch turnover mechanisms are all arranged on a rotating shaft of the sliding block mechanisms, each gear torsion spring clutch turnover mechanism comprises a fixing sleeve, a torsion spring, a torsion spring unlocking gear, a clutch gear and a fixing nut which are sequentially sleeved on the rotating shaft, and the torsion spring unlocking gears are connected with the sliding block mechanisms through a clamping part in a transmission way. According to the sliding block mechanisms and the variable-pitch louver sliding block system, which are disclosed by the invention, an existing sliding block mechanism and an existing variable-pitch louver sliding block system are improved, the problems that a torque transmission piece is not synchronous with a turnover drum, and ladder belts are easily abraded are effectively solved, and the sliding mechanisms are also suitable for the double dichotomy variable-pitch louver.