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384results about How to "Much time" patented technology

Low water head vertical shaft through-flow bi-directional efficient turbine runner as well as electromechanical device and mated flow passage thereof

The invention relates to a low water head vertical shaft through-flow bi-directional efficient turbine runner as well as an electromechanical device and a mated flow passage thereof. The turbine runner comprises a flow passage and an electromechanical part; the flow passage comprises a water inlet section, a vertical shaft section, a guide vane section, a runner section and a draft tube section; the electromechanical part mainly comprises an electric generator, a speed increaser, a movable guide vane, a main shaft and a water turbine; the runner comprises blades, a runner hub and a runner cone; the blades are uniformly arranged on the runner hub in the circumference direction; the section of each blade takes the shape of a symmetrical wing; the structure of the blade is that the middle part is thicker and the two ends are thinner; the ratio of the minimum thickness b1 to the maximum thickness b2 of the blade is 0.28 to 0.35; meanwhile, the wing-shaped bending angle of the blade ranges from 90 to 95 degrees; the initial placing angle of the blade is 66 degrees, and the adjusting value is within negative 3 degrees and positive 3 degrees. The turbine runner, the electromechanical device and the mated flow passage can operate bi-directionally, have better energy conversion performance, and are low in cost.
Owner:HOHAI UNIV

Continuous casting ladle final casting control system based on ladle discharged slag detection system and process control method

The invention provides a continuous casting ladle final casting control system based on a ladle discharged slag detection system and a process control method and belongs to the field of continuous casting machines and process control. A discharged slag detector of the continuous casting ladle final casting control system is arranged on an upper water gap of a ladle. A ladle sliding water gap is formed between the upper water gap and a long water gap of the ladle. A discharged slag detection, calculation and control unit is arranged, and the discharged slag detector is connected with the discharged slag detection, calculation and control unit through a discharged slag detection signal processing unit. The discharged slag detection, calculation and control unit is connected with the ladle sliding water gap through a sliding water gap control unit. According to the continuous casting ladle final casting control system, according to optimization of the steel passing speed in the casting process of a casting machine, tundish tonnage control and opening control over the ladle sliding water gap in the later period of ladle casting, optimization of ladle discharged slag detection control, ladle molten steel yield control and tundish tonnage control is achieved; and on the premise of not increasing the labor intensity of operators, controlling the range of influences on casting stability and guaranteeing the quality of molten steel, the yield of the ladle molten steel is increased.
Owner:BAOSHAN IRON & STEEL CO LTD

Hysteresis control method of three-phase four-switch-type active filter

The invention discloses a current hysteresis control method of a three-phase four-switch-type active filter. The hysteresis control method of the three-phase four-switch-type active filter comprises the following steps: 1, firstly, three-phase reference directive current of an active filter and three-phase compensation current output actually are converted into a coordinate system with alpha-beta two-phase orthogonality by Park conversion; 2, output signals d alpha and d beta are obtained from error signals between the reference current and the actual output current after Park conversion by a hysteresis comparator; 3, a corresponding switch state table is obtained according to the topological structure of the three-phase four-switch-type active filter, and the switch action functions of two bridge arms are obtained by combining with the hysteresis comparison result and the switch state result, so that the hysteresis control of the three-phase four-switch-type active filter is realized. The hysteresis control method of the three-phase four-switch-type active filter, which is provided by the invention, is simple and reliable, is good in dynamic performance, and has favorable economic significance and market prospect.
Owner:SOUTHEAST UNIV

Cultivation of artificial rare hollow tree

The invention relates to cultivation of an artificial rare hollow tree, belongs to the gardening technology for manufacturing the rare hollow tree artificially in agriculture, forestry and farm production, and relates to a method for an artificial tree. When the rare hollow tree is manufactured artificially, a plurality of plants of treelets which are transplanted in field for 1 to 2 years are divided into two groups, and are adducted and inarched and bundled by buckling on each section in a positively and negatively spiral mode on the basis of 60-degree inclined planes until the required height is reached. The treelets are grown to be adducted naturally, and absorb nutriments by transferring water mutually. The appearance characteristic of the formed artificial tree include: triangular hollow leak holes are formed on multiple inclined planes at the periphery of the trunk, the middle of the tree is hollow, and branches and leaves are the same as those of the conventional tree (seen in the figure 3). In the artificial rare hollow tree, the process from manufacturing to sale is 5 to 10 years generally. The artificial rare hollow tree is suitable for the ornament planting of garden landscapes, the defect of insufficient rare trees at present is overcome, and the abundant garden art and culture is increased.
Owner:刘铁伍

Local chicken breeding greenhouse with chickens and vegetables therein at same time and local chicken breeding method

The invention belongs to the field of agriculture, and particularly discloses a local chicken breeding greenhouse with chickens and vegetables therein at the same time and a local chicken breeding method. The local chicken breeding greenhouse comprises a greenhouse body formed by a wall body and a ceiling. A thermal insulation quilt is arranged outside the ceiling. A buffer room is arranged outside the greenhouse body. A local chicken breeding area is arranged on the north part of the inner side of the greenhouse body in the east-west direction. A crop planting area is arranged on the south part of the inner side of the greenhouse body in the east-west direction. According to the local chicken breeding greenhouse and the local chicken breeding method, an efficient and ecological planting and breeding combined development mode is put forward according to the characteristics of greenhouse crop growth and the requirements of local chickens for stocking and through the combination of current ecological, economic and social development requirements; economic benefits are high, management requirements are low, the technology is easy to operate and grasp, ecological benefits are good, tillage resources can be fully used, ecological environment is improved, and the greenhouse has the advantage that benefits are obtained in many years through one-time investment.
Owner:POULTRY INST SHANDONG ACADEMY OF AGRI SCI

Intersecting-free straw strip-shaped return-to-field cultivation method for maize tillage

The invention discloses an intersecting-free straw strip-shaped return-to-field cultivation method for maize tillage. The method includes the steps that 1, before crop seeding is performed, crop strawof a last season is smashed in situ, ridge clearing and strip gathering are performed for the first time, straw at strip gathering positions is mixed and stirred in a soil layer, first seeding stripsare formed at ridge clearing positions, and first return-to-field strips are formed at the strip gathering positions; 2, before crop seeding of a next season is performed, crop straw is smashed in situ, ridge clearing and strip gathering are performed for the second time, the straw at strip gathering positions is mixed and stirred in a soil layer, second seeding strips are formed at ridge clearing positions, and second return-to-field strips are formed at the strip gathering positions; in the two adjacent planting seasons, the positions of seeding strips and the return-to-field strips are interchanged or the second seeding strips horizontally move to the first return-to-field strips to form strip spacing tillage. The arable layer structure of virtuality and reality alternating is created,and the method has the advantages of non-tillage and deep tillage, effectively solves the key problems in straw returning to the field, and is also an effective way for construction of a reasonable arable layer on dry land and promotion of soil fertility.
Owner:SHENYANG AGRI UNIV

Transcatheter heart valve replacement system

The invention relates to the field of medical apparatuses and instruments, in particular to a transcatheter heart valve replacement system. The transcatheter heart valve replacement system comprises a valve stent with a preset shape, and a repairing mechanism; the repairing mechanism is constructed to be located in the middle area of an autologous valve and used for clamping an autologous valve leaflet; in addition, the repairing mechanism has two forms of capturing and separating, wherein when the repairing mechanism is in the capturing form and clamps the autologous valve leaflet, the valve stent is located in the middle area of the repairing mechanism, and the valve stent is restored to be in the preset form and promotes the repairing mechanism to be detached and separated; before the valve stent replaced according to the scheme is implanted, the autologous valve can still work normally, more time is won for an operation, and complications are effectively reduced; and the valve stent can smoothly reach the middle area of the repairing mechanism along a guide inner core, positioning is accurate, operation is more convenient and faster, when the valve stent gradually expands in the radial direction to recover the preset form, the repairing mechanism is separated and surrounds the periphery of the valve stent, and implantation is completed.
Owner:NINGBO JENSCARE BIOTECHNOLOGY CO LTD

Highly flame-retardant and fire-retardant cable

The invention discloses a highly flame-retardant and fire-retardant cable. The highly flame-retardant and fire-retardant cable comprises a cable core. The cable core comprises a waterproof layer and a central reinforcing piece arranged in the central position of the cable core, wherein the waterproof layer covers the outmost layer of the cable core. A filling rope, a waterproof piece and a plurality of loose casing pipes are arranged between the waterproof layer and the central reinforcing piece and are hinged to the outside of the central reinforcing piece, optical fiber units are arranged in the loose casing pipes, waterproof filler is arranged between the loose casing pipes and the optical fiber units, a highly flame-retardant thermal insulation layer covers the outside of the cable core, an inner flame-retardant protection layer covers the outside of the highly flame-retardant thermal insulation layer, an outer flame-retardant protection layer is arranged on the outside of the inner flame-retardant protection layer, and a metal protection layer is arranged between the inner flame-retardant protection layer and the outer flame-retardant protection layer. The highly flame-retardant and fire-retardant cable has the advantages of being reasonable in design, simple in structure and strong in flame-retardant and fire-retardant performance and facilitates popularization.
Owner:JIANGSU ETERN
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