638results about How to "Good strength" patented technology

The invention discloses a novel infrared and radar integrated stealth fabric and a preparation method thereof. The stealth fabric comprises an infrared camouflage surface layer and an antistatic bottom layer in turn from outside to inside; the infrared camouflage surface layer comprises an infrared stealth layer, a fabric layer and a radar wave absorption attenuation layer in turn from outside toinside; the infrared stealth layer is compounded by using a coating coated by an infrared stealth coating and a magnetron sputtering ITO (indium tin oxide) film arranged on the surface of the coating; the radar wave absorption attenuation layer comprises a sponge body; and a wave absorption material is adsorbed on the sponge body. The stealth fabric can realize radar stealth function and infraredstealth function at the same time, has good integral wave absorption effect and low surface density of materials, and has good effects on the aspects of breaking strength, bursting strength and the like. Moreover, excessive complex processes are not adopted for manufacturing the stealth fabric, and the stealth fabric can be produced by using a conventional fabric production method, so the stealthfabric is convenient for production and easy for implementation.

The invention discloses a leveling method based on four-point support and an electromechanical automatic leveling system. In the leveling method, a symmetrical diagonal lifting and leveling strategy is adopted, and the leveling purpose is achieved mainly by regulating the levelness of the ligatures among supporting points on diagonal lines; and the leveling system comprises a central processor, a level sensor, a control keyboard, a display, four alternating-current servo drivers and four supporting legs; and each supporting leg comprises a motor, a speed reducer, a ball screw and a base. The invention is particularly suitable for large-medium-sized radar truck vehicle-mounted platforms, communication vehicles and various engineering vehicles for engineering machinery, the method has the advantages of high leveling efficiency, high leveling reliability and the like, and the leveling system has the advantages of high leveling precision, high intelligent degree, high speed, strong carrying capacity, good stability, high transmission efficiency, suitability for severe environments and the like.

The invention relates to a method for comprehensively recycling valuable compositions of rare earth, iron, niobium and fluorite in rare-earth tailings, and belongs to the fields of comprehensive resource utilization technologies and mineral processing engineering. The rare earth, the iron, the niobium and the fluorite in the rare-earth tailings are efficiently and comprehensively recycled by the method including 'grinding the rare-earth tailings, performing low-intensity magnetic separation, performing high-intensity magnetic separation on weak-intensity magnetic tailings, performing flotation on high-intensity magnetic tailings to obtain fluorite in the high-intensity magnetic tailings, performing flotation separation on high-intensity magnetic concentrates to obtain rare earth, iron and niobium in the high-intensity magnetic concentrates, reducing and roasting base flows, performing low-intensity magnetic separation to obtain iron and niobium in the base flows and performing flotation on low-intensity magnetic tailings to obtain niobium in the low-intensity magnetic tailings according to characteristics that the rare-earth tailings contain the various valuable compositions. Compared with a method for singly recycling one or two valuable compositions, the method has the advantages that the purpose of comprehensively recycling the valuable compositions in the rare-earth tailings can be effectively achieved, secondary resources can be sufficiently utilized, and the method has excellent economical and social benefits.

The invention provides a method for connecting parallel connection walking robots and a parallel connection walking robot thereof. The parallel connection walking robot mainly comprises two parallel connection mechanisms, wherein each parallel connection mechanism also comprises an upper platform, a lower platform and three or more branch chains for connecting the upper platform with the lower platform. The parallel connection walking robot is characterized in that the two parallel connection mechanisms have specific freedom degree combinations, and the sum of freedom degrees is larger than or equal to 7; the upper platforms of the two parallel connection mechanisms are fixedly connected together, and the distance between projections of the hip joint polygonal centers of the two parallel connection mechanisms on the horizontal plane is smaller than or equal to 0.8 (Ra+Rb); and the lower platforms of the two mechanism respectively comprise two mutual independent foot arches. The robot can stably walk without adjusting the gravity center left and right in the advancing process, has the advantages of three-toe standing, high rigidity, high carrying capacity, flexible steering, high obstacle climbing capability, and the like, can be used for works, such as survey, rescue, exploration, and the like and can be also used for a manipulator.

The invention discloses a construction method for enabling a shallowly buried and darkly excavated tunnel to pass through a cottage area. The construction method comprises the following steps: excavating a tunnel hole of the constructed shallowly buried and darkly excavated tunnel from back to front through a step excavation process, and performing preliminary bracing on the tunnel hole formed by excavating from back to front in an excavating process, wherein the tunnel hole consists of an upper guide hole and a lower guide hole positioned right below the upper guide hole, the rear part of the tunnel hole is connected with a vertical well, the preliminary bracing structure of the tunnel hole comprises a plurality of grating steel frameworks for supporting the tunnel hole from back to front, a layer of bar-mat reinforcement suspended on the inner wall of the tunnel hole and a concrete layer jetted on the inner wall of the tunnel hole. The process for excavating the tunnel hole of the shallowly buried and darkly excavated tunnel comprises the following steps: I, excavating the initial segment of the upper guide hole; II, excavating the initial segment of the lower guide hole; III, synchronously excavating the upper and the lower guide holes. The construction method disclosed by the invention is simple in step, reasonable in design, convenient in construction, good in construction effect, capable of simply completing the construction process of the shallowly buried and darkly excavated tunnel that passes through the cottage area, and safe and reliable in a construction process.

The present invention discloses one kind of multiple anchor point anti-slide pile suitable for multiple slide plane condition and deep slide plane condition and its construction process. The construction process includes the following steps: excavating pile well and setting pile stem protecting wall in sections; boring hole in proper depth, installing anchor cable, grouting and tensing the anchor cable temporarily onto the protecting wall; further downward excavating and repeating the forgoing said steps until installing the lowest anchor cable; further excavating the pile well to designed depth; assembling reinforcing cage inside the pile well; tensing anchor cables and locking; and final pouring pile concrete to complete the pile construction.

The invention discloses a rear supporting point triangular bracket hanging basket, which comprises (1) a bearing platform, (2) a suspension fixing system used for supporting and fixing the bearing platform on poured concrete; (3) a template system, and (4) a walking system. The rear supporting point triangular bracket hanging basket provide by the invention is supported and fixed on a poured edge main girder through hanging arms arranged at the middle part and the rear part of the hanging basket; the front part extending forwards is a suspension arm which can be used for bearing the pouring construction of the edge main girder, thus, a bridge guy cable does not need to bear forces, in such a way, the overall hanging basket system is stressed uniformly, the appearance of the hanging basket is more light, and the mobile construction operation can be carried out more conveniently; on the other hand, by adopting the triangular bracket hanging basket, a construction way of pouring the edge main girder firstly and then pouring a rear bridge top plate and a transverse partition plate can be adopted; the edge main girder, the top plate and the transverse plate are constructed separately in order, thus, the adverse influence of the edge main girder pretensioned force to the top plate is solved, the edge main girder pretensioned force can be ensured not being shared and weakened by the top plate, and moreover, the pretensioned force can be applied to the edge main girder more correctly.

The invention discloses a method for industrially preparing a dimorphic hard alloy with both high strength and high tenacity, belonging to the technical field of hard alloys. The method comprises the following steps of: according to the content of Co in the dimorphic hard alloy, ball-milling and mixing WO2.9, Co3O4 and carbon black; coldly pressing into a billet block; preparing WC-Co composite powder in a vacuum furnace; ball-milling by taking absolute ethyl alcohol or hexane as a medium; drying to obtain the WC-Co composite powder; under the protection of argon, performing powder aggregation pre-treatment; raising the temperature to 650-950 DEG C at a speed of 5-8 DEG C per minute; keeping the temperature for 30-60 min; adding 30-80 ml of polyethylene glycol forming agent to each kilogram of powder; moulding and forming; and sintering the moulded and formed powder billet in vacuum or at low pressure. The WC-Co dimorphic hard alloy prepared by the invention has both high strength andexcellent breakage tenacity. The method is an integral industrialization preparation technology route.