44results about How to "Improve load bearing" patented technology

The invention discloses a three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material. The composite material comprises a three-dimensional silicon carbide fiber preform and yttrium silicate, the yttrium silicate is a mixed crystalline phase of Y2Si2O7 and Y2SiO5, a crystalline phase of the Y2Si2O7 or a crystalline phase of the Y2SiO5, the pores of the three-dimensional silicon carbide fiber preform are uniformly filled with the yttrium silicate, and the porosity of the three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material is 10%-16%. A preparation method comprises the following steps: (1) preparing a Y2O3-SiO2 composite sol; (2) performing impregnating; (3) performing drying; (4) performing heat treatment; and (5)repeating processes including impregnating-drying-heat treatment in the steps (2)-(4). The three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material has the advantages of low porosity, a high compact degree, high-temperature resistance, oxidation resistance, excellent mechanical properties and the like; and the preparation efficiency of the preparation methodis high, and the compact degree and mechanical properties of the prepared composite material are remarkably improved.

The invention relates to the field of buildings, in particular to an admixture for marine engineering concrete and a preparation method of the admixture. The admixture is prepared from raw materials in parts by weight: 100-150 parts of a water reducing agent, 0.5-1 part of tetramethylammonium iodide, 1-5 parts of sodium ethoxide, 3-5 parts of polyacrylamide, 30-50 parts of a surfactant, 15-20 parts of a rust inhibitor, 30-50 parts of an expansion agent, 3-5 parts of a retarder, 6-10 parts of a deforming agent and 0-80 parts of water. The invention aims to overcome the shortcomings of the priorart and provide the admixture for the marine engineering concrete and the preparation method of the admixture, the effects of water reduction, rust resistance, defoaming and retarding are achieved, and the effects are improved; the admixture is added into the concrete, so that the flowability of concrete slurry is improved, retentivity is good, the water reduction rate is high, the density of theconcrete is improved, good flocculability is achieved, and the friction resistance between liquid can be reduced; and the grinding efficiency is improved, and the admixture has the characteristics ofexcellent anti-permeability, fast hardening and early strength, high later strength and the like.

The invention relates to a chain cable securing device for a ship, which can be widely used for water drum mooring of the ship during defending against a hurricane. The chain cable securing device for the ship comprises a base and a manual opening and closing mechanism which is configured together with the base, wherein the manual opening and closing mechanism comprises a press cover with one end hinged with the base; an internal arc groove and an external arc groove are respectively formed inside and outside the press cover configured together with the base; the press cover is connected with a manual rocking bar by a connecting bar and the other end of the manual rocking bar is hinged with the base so that a double-rocking-bar type manual opening and closing mechanism; the manual rocking bar of the manual opening and closing mechanism is connected with a self-locking mechanism; and the self-locking mechanism is connected with a manual unlocking device. The chain cable securing device for the ship, provided by the invention has the advantages of compact and reasonable structure, high reliability, small appearance, light weight, high bearing load, strong hurricane defending mooring function, convenience in use, functions of rapidly clamping, automatically locking and rapidly unlocking hurricane defending chain cables and capability of being widely used for water drum mooring of the ship during defending against the hurricane.

The invention discloses a three-dimensional carbon fiber preform reinforced yttrium silicate composite material. The composite material comprises a three-dimensional carbon fiber preform and yttrium silicate, the yttrium silicate is a mixed crystalline phase of Y2Si2O7 and Y2SiO5, a crystalline phase of the Y2Si2O7 or a crystalline phase of the Y2SiO5, the pores of the three-dimensional carbon fiber preform are uniformly filled with the yttrium silicate, and the porosity of the three-dimensional carbon fiber preform reinforced yttrium silicate composite material is 9%-14%. A preparation methodcomprises the following steps: (1) preparing a Y2O3-SiO2 composite sol; (2) performing impregnating; (3) performing drying; (4) performing heat treatment; and (5) repeating processes including impregnating-drying-heat treatment in the steps (2)-(4). The three-dimensional carbon fiber preform reinforced yttrium silicate composite material has the advantages of low porosity, a high compact degree,high-temperature resistance, oxidation resistance, excellent mechanical properties and the like; and the preparation efficiency of the preparation method is high, and the compact degree and mechanicalproperties of the prepared composite material are remarkably improved

The invention discloses a light-weight large-load commercial vehicle stabilizer bar and suspender assembly and a preparation method thereof. The stabilizer bar and suspender assembly comprises a composite material rod body and a reinforcement body, wherein the reinforcement body is fiber or metal wires and comprises a plurality of reinforcement body sections, a first sleeve is arranged at one end of the rod body, and a second sleeve and a third sleeve are arranged at the other end of the rod body; a bushing is arranged in each sleeve, at least one fourth bushing is arranged in the rod body, when the number of the fourth bushing is one, a reinforcing body section is wound between the first bushing and the fourth bushing, reinforcing body sections are wound between the second bushing and the fourth bushing, reinforcing body sections are wound between the third bushing and the fourth bushing, and when the number of the fourth bushings is more than two, reinforcing body sections are also wound between two adjacent fourth bushings. The preparation method comprises injection molding or pouring molding. The stabilizer bar assembly has the advantages of being light in weight, high in bearing load, high in design freedom degree and the like, and can be suitable for rod pieces with longer lengths and more complex structures.

The invention discloses a squirrel cage type elastic support with a rigid gradient. The squirrel cage type elastic support comprises a fixing ring and a cylindrical bearing installation ring with oneend fixedly connected with the fixing ring. Multiple through grooves are formed in the cylinder wall of the cylindrical bearing installation ring, and multiple variable-section cage bars which are evenly distributed are correspondingly formed. By means of the squirrel cage type elastic support, a second cage bar part with the smaller section area is adopted at the end away from the fixing ring, and a first cage bar part with the large section area is adopted at the end close to the fixing ring. The rigidity of the squirrel cage type elastic support is adjusted by adjusting the relative size ofthe section area of the two parts of cage bars, and therefore the critical rotating speed of a rotor system is adjusted; and meanwhile, the bearing load and the bending moment capability of the squirrel cage type elastic support are improved, the cage bars are not likely to be fractured, the fatigue strength reservation is improved, and the service life is prolonged.

The invention provides a spliced ​​steel structure truss, which includes a series shaft, an arc-shaped frame unit, a side support unit and a middle support unit; the invention can solve the problem of the poor stability of the main structure of the steel structure truss used in daily buildings, which needs to be adopted A large number of bolts are used to fix the adjacent steel rods. It is troublesome to remove the fixed trusses, and the fixed bolt holes are usually set according to the predetermined connection positions on the trusses of the steel structure, which can only bear the same range of loads and cannot pass through. Changing the overlapping position between the trusses to adjust the load-bearing load will cause the trusses to be limited in the actual use process and cannot meet the actual engineering construction needs and other problems.

A hydraulic system for controlling tension of a steel wire rope comprises a master reversing valve (2), a switching valve (3), a check valve (4), a backpressure valve (5), and a hydraulic motor (1). The master reversing valve (2) is used for leading hydraulic oil into or out of the hydraulic system; the hydraulic motor (1) is used for outputting power to a traction device of the steel wire rope; a first end of the switching valve (3) is in communication with a first oil outlet (A) of the master reversing valve (2), an inlet of the check valve (4), and an outlet of the backpressure valve (5); a second end of the switching valve (3) is in communication with a second oil outlet (B) of the master reversing valve (2) and a first end (B) of the hydraulic motor; and an inlet of the backpressure valve (5) is in communication with an outlet of the check valve (4) and a second end (A) of the hydraulic motor (1). The present invention provides a crane having the hydraulic system and a method for controlling tension of a steel wire rope. The system and the method can solve the problems in the prior art that a telescopic-boom crane with a super-lift winding mechanism has low stability and low work efficiency during stretching of a lifting boom.

The invention relates to improvement of the traditional steel bar concrete precast floor slab, which is characterized in that the upper surface layer and the lower surface layer of a precast concrete hollow floor slab are internally provided with a two-way steel bar framework, an upper and lower layer connecting steel bar concrete ribs consisting of a vertical steel bar connecting steel bars of the upper surface layer and the lower surface layer and wrapping concrete is arranged between the upper surface layer and the lower surface layer; heat insulation and sound insulation materials are filled between the two steel bar concrete ribs; two sides and two ends of the floor slab in an axial direction are both provided with connecting steel bars and side wings of the extending thickness less than the thickness of the floor slab; and shelf beams at two end parts of the floor slab are internally provided with transverse steel bar frameworks forming beam structures and anti-shearing diagonalsteel bars connecting the steel bars at the lower surface layer. The precast floor slab integrates the advantages of the precast floor slab and the cast-in-place floor slab, overcomes all defects of the precast floor slab and the cast-in-place floor slab, especially has small cast-in-place construction workload and high construction speed, can meet requirements of the construction for rapid operation, materials saving and no pollution in an assembled building, accords with the development direction of the building industrialization production, and has high earthquake resistance of the cast-in-place floor slab.

The invention discloses a three-dimensional carbon fiber reinforced alumina-zirconia composite material and a preparation method thereof. The preparation method comprises the following steps: (1) stabilizing an alumina-zirconia composite sol; (2) under vacuum immersing a three-dimensional carbon fiber preform in the alumina-zirconia composite sol; (3) drying the impregnated three-dimensional carbon fiber preform; (4) performing heat treatment; (5) repeating the impregnation, drying, and heat treatment process from the step (2)-the step(4) for the until weight gain of a three-dimensional carbonfiber reinforced alumina-zirconia composite material intermediate is less than 1% compared with that of the three-dimensional carbon fiber reinforced alumina-zirconia composite material intermediatetreated after last impregnation, drying, and heat treatment process to obtain the three-dimensional carbon fiber reinforced alumina-zirconia composite material. The three-dimensional carbon fiber reinforced alumina-zirconia composite material has the advantages of high temperature resistance, oxidation resistance and excellent mechanical properties and the like.

The invention discloses a preparation method of a three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material. The preparation method of the three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material comprises the following steps of (1) stabilizing SiO2-ZrO2 composite sol; (2) impregnatingthree-dimensional carbon fiber prefabricated members into the stabilized SiO2-ZrO2 composite sol; (3) drying the impregnated three-dimensional carbon fiber prefabricated members; (4) performing thermal treatment; (5) repeating the impregnation-drying-thermal treatment process in the steps of (2) to (4) until the weight gain rate of a three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material intermediate in a current impregnation-drying-thermal treatment process relative to a previous impregnation-drying-thermal treatment process is smaller than 1% to obtain the three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material. The prepared three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material has the advantages of being high in high-temperature resistance and antioxidant and mechanical performance and the like.

The invention provides a flexible gear and a harmonic reducer suitable for heavy load working condition. The flexible gear comprises a cylinder body, an inner hole of the cylinder body is used for installing a wave generator, a plurality of flexible gear teeth are arranged on the outer circumferential wall of the cylinder body, the flexible gear teeth are evenly arranged in the circumferential direction of the cylinder body at intervals and extend in the axial direction of the cylinder body, the tooth profiles of the flexible gear teeth are symmetrical about a first plane, the first plane is a plane passing through the axial extension line of the top points of the tooth profiles of the flexible gear teeth and the central axis of the cylinder body, and on the first plane, along the direction from the cylinder opening to the cylinder bottom of the cylinder body, the tooth-direction modification curve of the flexible gear teeth is a continuous smooth curve, and the distance between the tooth-direction modification curve and the central axis is increased firstly and then decreased. According to the flexible gear, the phenomenon of inter-tooth interference in the meshing process can be reduced.

The invention discloses a three-dimensional silicon carbide fiber preform reinforced yttrium oxide-zirconium oxide multiphase ceramic composite material and a preparation method thereof. The compositematerial comprises a three-dimensional silicon carbide preform and an Y2O3-ZrO2 multiphase ceramic, in the Y2O3-ZrO2 multiphase ceramic, molar content of ZrO2 is 5-95%, the Y2O3-ZrO2 multiphase ceramic is uniformly filled in pores of the three-dimensional silicon carbide fiber preform, and porosity of the composite material is 9-16%. The preparation method comprises the following steps: (1) preparing Y2O3-ZrO2 composite sol; (2) impregnating; (3) drying; (4) carrying out heat treatment; and (5) repeating the impregnation-drying-heat treatment process in the steps (2)-(4). The composite material disclosed by the invention has the advantages of low porosity, high density, high temperature resistance, oxidation resistance and good mechanical properties, the preparation method has high preparation efficiency, and the density and mechanical properties of the composite material are obviously improved.

The invention discloses a three-dimensional silicon carbide fiber preform reinforced yttrium oxide-zirconium oxide multiphase ceramic composite material and a preparation method thereof. The compositematerial comprises a three-dimensional silicon carbide preform and an Y2O3-ZrO2 multiphase ceramic, in the Y2O3-ZrO2 multiphase ceramic, molar content of ZrO2 is 5-95%, the Y2O3-ZrO2 multiphase ceramic is uniformly filled in pores of the three-dimensional silicon carbide fiber preform, and porosity of the composite material is 9-16%. The preparation method comprises the following steps: (1) preparing Y2O3-ZrO2 composite sol; (2) impregnating; (3) drying; (4) carrying out heat treatment; and (5) repeating the impregnation-drying-heat treatment process in the steps (2)-(4). The composite material disclosed by the invention has the advantages of low porosity, high density, high temperature resistance, oxidation resistance and good mechanical properties, the preparation method has high preparation efficiency, and the density and mechanical properties of the composite material are obviously improved.