A low-viscosity silicone oil type speed locker for bridges in severe cold regions

Abstract

The invention relates to a low-viscosity silicone oil type shock transmission unit for a bridge in a frigid area and belongs to the technical field of shock transmission units. The low-viscosity silicone oil type shock transmission unit for the bridge in the severe cold area comprises an oil cylinder body, a front lining, a back lining, a piston rod, a piston, a damping structure, a damping medium, a shell assembly, a connection pipe assembly, a multi-grade seal piece and a pin head. The piston rod and an auxiliary piston rod are connected through threads. The piston is installed outside the piston rod. A valve body is installed in the piston rod. The two ends of the oil cylinder body are sealed by the front lining and the back lining. The low-viscosity silicone oil type shock transmission unit for the bridge in the severe cold area is simple in structure and stable in performance; when a body structure is under the shock working condition, the damping structure is activated, the piston basically cannot move, and the shock transmission unit almost becomes a rigid connector and fixes the body structure; and all the parts of the shock transmission unit are made of low-temperature-resistant materials, and the shock transmission unit is used for damping in the frigid area.

Description

technical field [0001] The invention relates to the technical field of speed lockers, in particular to a low-viscosity silicone oil type speed locker for bridges. Background technique [0002] In recent years, speed lockers have been widely used in the anti-vibration design of bridge engineering structures. It is a device similar to a speed switch. The common speed locker is a hydraulic cylinder. Its working principle is: when the bridge structure only expands with heat and contracts with cold, or the concrete creeps and shrinks, the damping structure does not work, and the piston It can move freely in the cylinder body and has almost no binding force on the structure. When the bridge structure is subjected to a sudden shock load, the damping structure inside the speed locker is activated, and the speed locker becomes almost a rigid connection device, suppressing the vibration of the bridge structure. [0003] The lowest temperature in winter in the severe cold areas of no...

AI Technical Summary

Problems solved by technology

The damping medium of the speed locker designed for normal temperature use is made of high-viscosity silicone resin compound. The performance of this damping medium is relatively stable at normal temperature, but the viscosity changes greatly at low temperature, resulting in the low-speed friction resistance of the locker being greater than 10%. carrying capacity beyond the requirements

[0004] At present, traditional speed lockers mostly use rubber seals. When the temperature drops, the physical properties of rubber seals, such as: hardness, tensile strength, elongation, compression permanent deformation, etc., will undergo relatively large changes, so in In the working environment of -20~-30℃, it is difficult to guarantee the sealing performance of this type of seal

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