64results about How to "Reduce dynamic stress" patented technology

An elastic sieving method and corresponding large-sized elastic vibration screen. The present invention utilizes a screening surface and a separate sieving machine. A screen mat located on the sieve box is connected to multiple small rectangular screens. While the machine is vibrating, the resonation of screen rods located on the screen mat connected by small rectangular screens are initiated to screen the material and to cause the vibration of the whole vibration screen and realize the conveyance and lamination of materials. Because the screening surface is in a state of resonance, the vibration strength is strong enough to prevent the screen meshes from becoming plugged, allowing for high sieving efficiency. A bearing in the sieving mechanism is installed with a vibration damping ring, placing the bearing in a resonant state, allowing for a low dynamic stress level, which satisfies the process requirement for large-sized vibration screen excitation units with a screening surface as wide as 4800 mm. Thus, the production efficiency of vibration screen is high, the structure of the machine is simple and easy to repair and maintain, and energy consumption is reduced. Furthermore, the dynamic stress level of the sieving machine is low, the reliability is high, and the vibrations are stable. These properties allow the present invention to have a wide range of practical applications, including uses in the coal, metallurgic, chemical and environmental protection fields.

The invention relates to a vertical shaft multistage impulse water turbine. The vertical shaft multistage impulse water turbine is simple in structure and convenient to manufacture, so that the larger power per unit is obtained, the unit parameter level of a unit is improved, meanwhile, the plane excavation size is reduced, and damage to the environment is reduced. According to the technical scheme, the water turbine comprises a water inlet pipe, a power generator and a water turbine main shaft connected to the power generator; a plurality of runner cavities which are distributed on one straight line up and down are arranged and are communicated with a tail water channel, the water turbine main shaft sequentially penetrates all runner cavities from top to bottom, and vertical shaft water hopper type runners are arranged on the water turbine main shaft in a manner of corresponding to the runner cavities; a water distribution annular pipe surrounding each cavity is arranged in a manner of corresponding to each runner cavity, the water distribution annular pipes are communicated with the water inlet pipes, a plurality of spraying pipes and spraying needles are evenly connected to the water distribution annular pipes, water outlets of the spraying pipes and the spraying needles are located in the runner cavities and are arranged in a manner of being aligned with the vertical shaft water hopper type runners in the cavities.