43results about How to "Reduced range" patented technology

The invention relates to a device and method used for offshore fertilization and pesticide application through an unmanned ship and a drone, and relates to the field of cultivation in water areas through assistance of an unmanned ship. The device consists of a cultivation carrier, an unmanned ship and a drone. A material filling device and a drone recycling device are arranged on an unmanned ship body. Through the cultivation carrier, materials are applied to a cultivation region, the drone detects condition information of the cultivation carrier and the unmanned ship helps the drone to supply materials for the cultivation carrier. Thus, improvement of efficiency for applying materials to the cultivation region is achieved; by applying the unmanned ship technology to the offshore cultivation industry, risks in offshore operation of fishermen are reduced; and efficiency of offshore operation is improved.

The invention discloses a mountain river pebble beach group linked renovation method based on a gradient principle. The mountain river pebble beach group linked renovation method is characterized by setting two control conditions needed in shoal channel flow renovation, namely the unit discharge control condition and the gradient control condition, and construction and management are conducted by obtaining submerged dike specification data through a water conservancy simulation test according to the control conditions. In the control conditions, the linkage condition and the gradient principle of riverbeds are sufficiently considered, the number of model test groups is greatly reduced, the shoal renovation success probability is improved; finally the channel size can be better improved, the flow state can be improved and the silt is prevented from accumulating in the channel after obtained submerged dike data are implemented. Meanwhile, the submerged dike has the advantages of being simple in structure, fast and convenient to implement, low in implementation cost, good in strength and impact resistance and long in service life, and is suitable to be used in mountain rivers.

The invention discloses structural steel for a polar-region icebreaking transport ship and a preparation method of the structural steel. The structural steel is characterized by comprising the following chemical ingredients by weight percent: 0.11-0.25% of carbon, 0.61-1.25% of silicon, 0.10-0.39% of manganese, less than or equal to 0.008% of phosphorus, less than or equal to 0.001% of sulfur, 0.35-0.89% of chromium, 0.11-0.20% of titanium, less than or equal to 0.003% of nitrogen, and the balance of iron and inevitable impurities. The yield strength of the structural steel is more than or equal to 500 MPa, the cold brittleness transition temperature is lower than or equal to minus 70 DEG C, the comprehensive performances of the constructed polar-region icebreaking transport ship are excellent, the voyage is shortened, the safety is high, the defects in the prior art that a low temperature ship cannot break ice and the icebreaking ship does not have the capability of transporting large cargos are overcome, and the structural steel is of great significance for the domestic ocean shipping in the north pole.

The invention discloses a stope bottom structure suitable for underground two-step mining and a production process thereof. An underground stope is divided into a room stope and a pillar stope. Bottom pillars are reserved according to the bottom structure forms. Along-vein travelling roadways (4) and across-vein ore-drawing roadways (6) are utilized to handle the ores. The blasting ores (11) in the stope are blasted and fall in trenches (12). A scraper pours the ores into an ore pass (5) via a common ore-drawing drift (9) and a room ore-drawing drift (10). After tailing-cemented filling of the room of the stope, new pillar undercutting roadways (8) are driven in the bottom pillars (3) during mining the pillar stope. The trenches (12) for room mining are formed through drilling and blasting and undercutting. The goafs formed after mining and ore-drawing of pillars (2) are filled. The stope bottom structure can serve two stopes, reduce the quantities and support quantity, reduce the mining and development ratio of mining, improve the stability and save the mining cost and preparation time of two-step mining.

The invention discloses an underground box type pipe gallery of a steel-concrete mixed type structure. The underground box type pipe gallery comprises box type pipe sections, wherein each box type pipe section is formed by splicing a top plate, a bottom plate and two side plates. The box type pipe sections are spliced in the axial direction to form the box type pipe gallery. Concrete longitudinal columns are arranged at axial edges of the box type pipe sections. Concrete transverse columns are arranged at the two ends of the top plates or the bottom plates. Concrete stand columns are arranged at the two ends of the side plates. The concrete transverse columns and the concrete stand columns are in end-to-end connection to form a frame type framework. In the underground box type pipe gallery of the steel-concrete mixed type structure, the longitudinal columns and the frame type framework bear the main loading, and the bearing capacity of the pipe gallery is increased; by means of a bridge steel web plate structure, shearing resistance of the pipe gallery is enhanced; the side plates or sheets in the pipe gallery serve as wall boards of the pipe gallery, also serve as web plates of the anti-shearing bridge steel web plate structure of the pipe gallery and are utilized ingeniously; on the basis of a double reinforcing structure, the bearing capacity of the pipe gallery is greatly increased; and under the circumstance that the filling height remains the same, the structural wallboards are thinner, and materials are saved.

The invention discloses a reinforcement method for adding a new arch ring under the main arch ring of an old stone arch bridge. The invention improves the bearing capacity of the bridge by installing the new arch ring under the bridge, improves the bearing capacity of the bridge, and ensures the safety of the structure. The construction process is simple, the construction is convenient, and the reinforcement effect is good. In order to reduce the impact on the clear space under the bridge, the river channel under the bridge was repaired, the river bed was paved, and the arch ring was newly built under the old stone arch bridge. Compared with the demolition and reconstruction, the project scale was effectively reduced, and the construction speed was fast, reducing The amount and difficulty of construction, cost saving, shortening the construction work, reducing the impact on the old structure, retaining the unique style of the stone arch bridge, has little impact on the traffic on the bridge deck, and the opening equipment can meet the old arch rings or arches of different heights and radians. The opening of the foundation side wall is carried out, and at the same time, the negative pressure suction cup is used to cooperate with the adsorption to improve the stability of the entire opening equipment when opening the hole. At the same time, two openings are completed at the same time, and the spacing of the openings is convenient to adjust.

The invention is an unmanned automatic baiting boat with variable amplitude and segmented operation, which belongs to a baiting device for special aquaculture, and specifically relates to an unmanned automatic baiting boat with variable amplitude coverage, segmented operation, and breakpoint battery life. Bait boat. An unmanned automatic baiting ship with variable amplitude and segmented operation includes an automatic hopper and an unmanned automatic baiting ship; Dynamically adjust, control the operating status of the propeller and bait feeding machine according to the target demand and real-time status, and complete all bait feeding operations in sections; provide a light-weight one that meets the needs of different breeding scales and different breeding stages The unmanned automatic bait-casting boat with variable amplitude and segmental operation has a single specification, small hull size, low cost, high control precision and strong adaptability.