40results about How to "Limit extension" patented technology

The invention discloses a support method for bolt-grouting a composite crushing dynamic-pressure roadway soft rock roof by a high-pre-stressed anchor cable. The support method comprises the following steps of: after excavating a roadway, keeping up with a roadway driving head for drilling a deep part in a roadway roof, sending a deep hole camera shooting detecting instrument to the bottom of a drilled hole, recording inner wall lithological characters, fracture spacing and crushing region thickness range of surrounding rocks of different depths; keeping up with the roadway driving head, firstly drilling grouted holes in the surfaces of surrounding rocks, installing grouting pipes, then spraying thin-layer concrete on the surfaces of the surrounding rocks of the roadway for closing the surfaces of the surrounding rocks of the roadway to prevent slurry from overflowing; grouting the insides of the surrounding rocks through the grouting pipes, after slurry is solidified, drilling anchor cable holes in the surfaces of the surrounding rocks of the roadway, and when the depths of the anchor cable holes exceed the range of a crushing region, installing an anchor cable for reinforcing. The support method has the advantages of being simple in operation, bringing convenience for construction, saving secondary or multi-time support procedure, lowering the cost, saving the time and manpower, increasing the working efficiency, realizing dual-anchoring, and achieving the strong support effect, and is especially suitable for the roof which is difficult to support under the condition of dynamic pressure.

The invention discloses a power patrol unmanned aerial vehicle path planning method and a power transmission line patrol method. The path planning method comprises the following steps of S1, dividingan ideal path into a plurality of segments according to the set camera shooting power transmission line coincidence degree, setting a local target point, and deleting the point from a local target point array if the point is occupied by an obstacle to obtain a local target point sequence; S2, detecting whether the obstacle exists between points pi and pi+1 or not, adding pi+1 as a child node of piinto a random tree list if the obstacle does not exist, and planning a path from pi to pi+1 by using RRT if the obstacle exists; and S3, continuously planning a route to the next local target point according to the step S2 from a patrol starting point p0 until a patrol end point pn is reached so as to complete patrol flight path planning of the whole power transmission line. According to the method, a power line patrol task is ensured to observe the whole section of the power transmission line as much as possible, the obstacle can be avoided and crossing of electronic fences is limited.

The invention relates to a cement-based composite material for pavement of a steel box girder bridge deck, as well as a preparation method and a pavement method thereof. The invention aims at providing a lightweight and high-toughness cement-based composite material which is suitable for pavement of larger-span steel box girder bridge decks, and the cement-based composite material comprises the following components in parts by weight: 849-881 parts of cement, 339-425 parts of quartz sand, 215-273 parts of pottery sand, 100-226 parts of fly ash, 30-56 parts of silica fume, 275-295 parts of water, 10-13 parts of water reducing agent, 40-80 parts of steel fiber, 6.5-13 parts of organic fiber and 20-30 parts of epoxy resin. Through material optimization, the durability of a bridge deck paving layer is improved, the overall dead weight is reduced, the cost of a project is simultaneously saved, and the cement-based composite material is suitable for pavement of the larger-span steel box girder bridge decks.

The invention discloses a hybrid composite energy absorbing part for an automobile and a manufacturing method thereof. The hybrid composite energy absorbing part is round and tubular and comprises a first aramid fiber layer, a carbon fiber layer and a second aramid fiber layer. The manufacturing method of the hybrid composite energy absorbing part for the automobile comprises the steps that aramid fibers, carbon fibers and aramid fibers are wound around a core mold in sequence, and the first aramid fiber layer, the carbon fiber layer and the second aramid fiber layer are formed respectively, wherein base materials are infiltrated in the aramid fibers, the carbon fibers and the aramid fibers respectively; the core mold is removed after the wound energy absorbing part is well solidified. The hybrid composite energy absorbing part for the automobile and the manufacturing method thereof have the advantages that the development requirements for light weight and safety of the automobile are met, the process route is reasonable, the treatment technology and the treatment method are low in cost, high in cost performance and high in safety performance, and the hybrid composite energy absorbing part for the automobile and the manufacturing method thereof conform with the development direction of lower energy consumption and low pollution and comply with the development tendency of energy saving, emission reduction and environmental friendliness.

The invention relates to a preparation method of an oil absorbent, in particular to a method for preparing the oil absorbent from low grade diatomite. The preparation method comprises the following 9 steps of: low grade diatomite raw material selection, crushing, acidification treatment, washing, drying, adding of the assistant (3%-5%) Na2Cl (industrial salt) and mixing, roasting at 750-850DEG C, breaking winnowing, and adding of the silane coupling agent KH-550 (gamma-aminopropyl triethoxysilane, Nanjing Union silicon Chemical Co., LTD. 5%-7%) to conduct modification treatment, thus obtaining the particle and powder diatomite oil absorbent. The oil absorbent has simple and easy preparation method, wide raw material sources and low cost, solves the current solid waste pollution problem of low grade diatomite, opens up a new way for low grade diatomite application, and realizes recycling of waste materials. The oil absorbent has good selectivity, strong absorptivity up to 500% of its own weight, rapid oil absorption speed, small oil absorbent stacking density, a melting point of 1450DEG C, and a high use temperature, and can float on the water surface before and after oil absorption, thus being convenient for recovery and post-treatment.

The invention belongs to the technical field of concrete pouring, and particularly relates to a mass concrete circulating cooling system. According to the technical scheme, the mass concrete circulating cooling system comprises a water storing tank and a plurality of cooling water screens. The water storing tank communicates with a water inlet end of a water inlet pump by a pipeline. The water outlet end of the water inlet pump communicates with a water supplying pipeline. Water inlets of the cooling water screens communicate with the water supplying pipeline. Water outlets of the cooling water screens communicate with a backwater pipeline. The backwater pipeline is provided with a flow limiting valve. The backwater pipeline communicates with the water inlet end of a backwater pump. The water outlet end of the backwater pump communicates with the water storing tank by a pipeline. Cooling water in the water storing tank is conveyed to the water inlet pump to the cooling water screens. The cooling water screens are positioned in raft foundation concrete, can stably cool the poured concrete, and can conduct effective heat dissipation to concrete in the hydration process. The cooling water absorbs mass heat in the cooling water screens and is conveyed back to the water storing tank by the backwater pump, and therefore circulating application is achieved.

The invention relates to an anti-fatigue all-hydrogel composite material as well as a preparation method and application thereof. The anti-fatigue all-hydrogel composite material comprises a hydrogelskeleton and a hydrogel matrix filling in and bonded in the hydrogel skeleton, wherein the modulus of the hydrogel skeleton is 10 times or more the modulus of the hydrogel matrix. The all-hydrogel composite material is composed of the hydrogel skeleton and the hydrogel matrix with large modulus contrast, and polymer networks of the hydrogel skeleton and the hydrogel matrix are topologically entangled; the composite material can effectively limit crack propagation, and compared with a skeleton material and a matrix material, the all-hydrogel composite material has moderate modulus, but the fracture performance of the all-hydrogel composite material exceeds 4000 J/m<2> and is greatly improved; and the fatigue threshold value of the composite material exceeds 400 J/m<2>, so the composite material has important significance for an application scene in need for bearing of cyclic load. The composite material has the same fatigue resistance as a mechanical valve and the same biocompatibilityas a tissue valve.

This invention is an electro-thermal tube and its molded method. It solves the question of electro-thermal tube which would be extended in length when they heating in the mould, then its length and shape cannot be controlled very accurately, and the insulation power inside the tube would not be compressed tightly. In the figure we can see the electro-thermal tube and in its inner insulation powder and electric resistance, block up at inlet of the metal tube, they keep distance with the rube and keep distance with the metal rod too. This tube has been shaped by a metal tube which has ellipse section in its face having concave and convex structure and at least has one plane structure. The step of forming the tube is to put the tube on the proper place into the model A, at the concave place on this model, and press model B upon model A. shape concave and convex structure on the metal tube's face and extend this action along the tube, when the shaping action finished, take out of the models.

The invention relates to the technical field of prestressed prefabricated components, and discloses a preparation method of a prestressed prefabricated component. The preparation method comprises thefollowing steps that when an original component is heated and cured, a curing system to control the time for standing, heating, constant temperature and cooling is formulated, standing is performed atnormal temperature for 2-6 hours, the difference value between the surface temperature of the prefabricated component discharged out of a pool and the environment temperature does not exceed 25 DEG C, the original component adopts a prefabricated component joint surface connected by post-poured concrete or mortar and grouting materials, and rough surface treatment is carried out according to design requirements during manufacturing. When the design has no specific requirements, the rough surface can be manufactured through chemical treatment, galling or chiseling and other methods, a sandwichexternal wallboard of the original component is suitable for being produced through a flat die technology, and during production, an external wallboard concrete layer needs to be poured firstly, thena heat preservation material and a pulling piece need to be installed, and finally an internal wallboard concrete layer needs to be poured; and when a vertical die technology is adopted for production, inner and outer wallboard concrete layers should be poured synchronously, and measures should be taken to ensure accurate positions of thermal insulation materials and tie pieces.

The invention provides a thin plate retaining device capable of arranging a thin plate on an XY platform in an opening mode by simple and convenient operation in a laser machine. A first frame material (21) and a second frame material (22) are fixedly arranged on the XY platform (11), and are spaced from each other by a given distance. A first part (130) is arranged between the first frame material (21) and the second frame material (22), and one end of a thin plate (W) is clamped by the first part (130). A second part (140) is formed by relatively moving from a direction away from the first part (130), and is arranged between the first frame material (21) and the second frame material (22) along the second frame material (22), and the other end of the thin plate (W) is clamped by the second part (22). The ends of multiple connecting rods (L) which are formed in a swinging way are connected with the corresponding multiple parts of the second part (22), and the other ends of the connecting rods (L) are connected with a cylinder (160). The thin plate (W) can be arranged on the XY platform (11) by the simple and convenient operation that force is applied to the second frame material (22) by the second part (140).

The invention discloses a turbine guider crake brazing repair method. The method comprises the following steps that a crack of a turbine guider is removed, a groove is formed, and a bottom nickel-based alloy powder layer is laid in the groove; mixed brazing filler metal is arranged on the bottom nickel-based alloy powder layer, vacuum brazing is conducted, and the mixed brazing filler metal comprises 20-60% by mass of auxiliary nickel-based alloy powder and a brazing filler metal body; the bottom layer nickel-based alloy powder and the auxiliary nickel-based alloy powder are the same, and the difference between the melting point of the bottom layer nickel-based alloy powder and the auxiliary nickel-based alloy powder and the melting point of a substrate material of the turbine guider is +/-20 DEG C; and the temperature of brazing is higher than the melting temperature of the brazing filler metal body and is lower than the melting temperature of the bottom nickel-based alloy powder layer, the auxiliary nickel-based alloy powder and the substrate material. According to the turbine guider crake brazing repair method, the brazing filler metal body is completely melted, and the nickel-based alloy powder is not melted during brazing. The nickel-based alloy powder is mainly used as a structure frame, the brazing filler metal body is used for filling, and thus the stable structure and strength are ensured.

Belonging to the field of inorganic polymeric materials, the invention discloses a preparation method of a nano-silica and steel fiber reinforced concrete. The method includes: weighing aggregate, cement, a water reducing agent, fly ash, water, nano-SiO2 and steel fiber; adding the nano-SiO2 and the water reducing agent into part of the water, and mixing the substances evenly for standby use; wetting a mixer, then adding coarse aggregate and fine aggregate, performing mixing, then adding the cement and fly ash, conducting mixing, and then incorporating the steel fiber evenly along the mixer impeller rotation direction, performing mixing, then adding the mixture of the nano material, the water reducing agent and part of water, performing stirring, adding the residual water, and conducting mixing, thus obtaining the nano-silica and steel fiber reinforced concrete. By blending a specific amount of fiber and nano material into concrete, the method provided by the invention can prepare thenovel composite material fiber reinforced nano-concrete, which has the characteristics of high ductility, good compactness, good durability, etc., and meets the performance requirements of the concrete for bridge deck pavement.

The invention relates to the technical field of high-temperature materials, in particular to a high-temperature-resistant material, a preparation method thereof, a combined prefabricated part of a tundish impact area and the tundish impact area. The high-temperature-resistant material includes following raw materials by weight: 10-50 parts of magnesia, 30-75 parts of bauxite clinker, 2-10 parts ofwhite fused alumina powder, 1-10 parts of silica powder, 1-10 parts of steel fibers, 0.1-1 part of a water reducing agent, 0.1-1 part of explosion-proof fibers and 2-10 parts of water. The high-temperature-resistant material has good thermal vibration stability, strong impact resistance and excellent resistance to steel slag erosion. The combined prefabricated part of the impact area prepared using the material and the matching tundish impact area can significantly improve service lifetime of a tundish.

The invention relates to a degradable sludge-based seedling pot and a preparation method thereof. The seedling pot is prepared from, by weight, 2-5 parts of polyvinyl alcohol, 80-100 parts of water, 5-10 parts of gelatin, 5-10 parts of dextrin, 5-20 parts of sludge and 0.5-1 part of cross-linking agent. In the preparation process of the seedling pot, the forming treatment is conducted before the cross-linking treatment. The seedling pot has high mechanical properties and can meet the requirements of use performance of the seedling pot in seedling cultivation; the seedling pot can also be rapidly degraded in soil, so that the rapid growth and extension of plant roots after transplanting or planting are not limited, which has a positive effect in improvement of the survival rate of seedlingsand the growth rate of plants.

The invention discloses a ferromagnetic shape memory alloy with a nanometer eutectic lamella structure. The chemical formula of the ferromagnetic shape memory alloy can be shown as Ni51.5Mn40-xFexSn8.5, wherein x is larger than 0 and smaller than or equal to 8. A preparing method of the ferromagnetic shape memory alloy with the nanometer eutectic lamella structure includes the following steps thatfirstly, a Ni source, a Mn source, a Fe source and a Sn source are mixed according to the atom percent of a Ni51.5Mn34Fe6Sn8.5 alloy and are put into a metal smelting furnace; and secondly, smeltingis conducted under inert gas shielding, and the Ni51.5Mn34Fe6Sn8.5 alloy is obtained. The Ni51.5Mn34Fe6Sn8.5 ferromagnetic shape memory alloy is composed of a Heusler base phase and a gamma phase, themartensite phase transformation temperature of the alloy is 303 k, and the beneficial effects that toughness is large, strength is high, and the production technology is easy and convenient are achieved.

The invention provides a pressure sensor, a preparation method thereof and a pressure detection system. The pressure sensor comprises a first electrode layer, a second electrode layer, a first elastic dielectric layer and an anti-rolling structure, wherein the first elastic dielectric layer is located between the first electrode layer and the second electrode layer, and the first elastic dielectric layer has a first tensile modulus; and the anti-rolling structure is configured to limit the extension deformation of the first elastic dielectric layer in the direction perpendicular to the pressure when the first elastic dielectric layer is subjected to the pressure. According to the pressure sensor, the extension deformation of the elastic dielectric layers in the XY plane direction is limited by the anti-rolling structure, so that the elastic compression limits of the elastic dielectric layers in the Z-axis direction are increased, and the purposes of improving the overload pressure of the pressure sensor and increasing the range are achieved.