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.

A round baler is provided having a frame, a baling chamber on the frame for forming a round bale, an unloading area provided between the baling chamber and a ground surface and at least one depositing element which is arranged in the unloading area and which extends parallel to the rotational axis of the round bale and serves for supporting the round bale during an unloading operation. To reduce mechanical stress on the round bale caused by the depositing element and as a result to prevent damage to the round bale, a flat section is provided which, compared to the rollers otherwise usually used as depositing element, provides a higher contact surface for the round bale such that the surface pressure during the impact of the round bale can be decisively reduced compared to the use of a roller.

The invention discloses a renovation method for treating mud pumping of a plate-type ballastless track railway roadbed. Drilling is conducted on the surface layer of a foundation bed through a special horizontal drilling machine, and then the method that hot air is injected into grouting hole passageways is adopted; accumulated water in a mud pumping disease area is subjected to treatment, and grouting is conducted in grouting holes after accumulated water treatment is completed; before grouting, telescopic seams of a base plate, cracks of the side edges and orifices of the opposite sides of the grouting holes are subjected to sealing treatment, and then grouting is successively conducted in the hole passageways according to a certain sequence; a uniform and compact water insulation layer with the certain strength is formed between the base plate and the surface layer of the foundation bed after grouting is completed; and the water insulation layer can obstruct water of cracks on the upper portion from invading into the surface layer of the foundation bed and can also block fine particle soil in the surface layer of the foundation bed on the lower portion to move upwards. According to the novel renovation method for treating mud pumping of the plate-type ballastless track railway roadbed, the mud pumping disease of the plate-type ballastless track railway roadbed can be well governed.

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.