30results about How to "Overcome shrinkage" patented technology

The invention relates to a preparation method of a high-temperature-resisting aerogel material. The method comprises the following steps: (1) preparing sol; (2) carrying out a nano-crystal assemblingprocess to prepare aerogel wet gel which takes an oxide nano-crystal as a framework; (3) preparing an aerogel material; (4) carrying out a heat treatment process to prepare the high-temperature-resisting aerogel material. According to the preparation method provided by the invention, a nano-crystal assembling technology and heat treatment are combined to prepare the high-temperature-resisting aerogel material with a microcosmic core-shell structure; the core-shell structure forms a network framework under high temprature so that the growth of the oxide nano-crystal is inhibited and the shrinkage problem caused by the fact that the structure of oxide aerogel collapses in a high-temperature utilization process is effectively solved. The aerogel material prepared by the preparation method hasa good high-temperature-resisting property; the heat-resisting temperature is 1000 DEG C or more and the high-temperature-resisting aerogel material even can bear the high temperature of 1300 DEG C or more.

The invention discloses a heart chamber simulator driving mechanism, which comprises a motor, a speed reducer, a crank shaft connecting rod mechanism, a linear guide rail and a piston air cylinder, wherein an output end of the motor is connected with an input shaft of the speed reducer, an output shaft of the speed reducer is connected with one end of the linear guide rail through the crank shaft connecting rod mechanism, the other end of the linear guide rail is connected with the piston air cylinder through a shaft coupler, an air hole is formed in the side wall of the piston air cylinder, and the air hole is connected with a heart chamber simulator through a pipeline. The driving mechanism belongs to a driving mechanism capable of providing a pulsation type power source for the heart chamber simulator according to the set frequency and discharge capacity. The driving mechanism has the advantages that the pulsation feature of the beating of the heart chamber simulator can be realized, meanwhile, the beating frequency and the discharge capacity can be respectively regulated, and the human body heart beating process is more really simulated.

The invention discloses an automobile active steering system with a cycloidal-pin wheel mechanism, and aims at overcoming the contraction between light steering effort and flexibility. The automobile active steering system comprises a steering hand wheel (47), a steering shaft (52), a steering transmission shaft (48), a cycloidal-pin wheel type transmission mechanism (49), a rotary hydraulic valve (50), and a steering box (51). The steering hand wheel (47) is connected with an upper end of the steering shaft (52) by use of a spline pair, a lower end of the steering shaft (52) is connected with an upper end of the steering transmission shaft (48) by use of a universal joint, a lower end of the steering transmission shaft (48) is connected with a right end of an input shaft (21) of the cycloidal-pin wheel type transmission mechanism (49) by use of a universal joint.

The invention relates to the technical field of modified materials, and discloses a poly-methyl ethylene carbonate composition and a preparation method thereof. The composition comprises the following raw materials: a poly-methyl ethylene carbonate matrix, a modified material and an adjuvant, wherein the modified material is composed of thermoplastic polyurethane and polyvinyl alcohol in melting and blending manners; the mass ratio of the modified material to the poly-methyl ethylene carbonate is (10-100) to 100; polyvinyl alcohol accounts for 30%-50% by mass of the modified material; the adjuvant accounts for 0.5%-2%. The preparation method comprises the following steps: melting and blending TPU with PVA; and then blending and pelletizing with PPC. The composition disclosed by the invention has the advantages of good film-forming property and dimensional stability, good tensile strength, breaking elongation, biodegradability and the like. The composition disclosed by the invention does not agglomerate or deform, and does not affect the processability after being placed for a long period of time when the matrix cost is lowered; the film is not bonded; the breaking elongation of the film disclosed by the invention after water absorption is increased; and meanwhile, good tensile strength is kept.

The invention discloses a heart chamber simulator driven by a hydraulic or air-pressure artificial muscle. The heart chamber simulator can really reflect cardiac systolic and diastolic beating process pressure and chamber deformation. The simulator comprises an outer sheath layer, a myocardium layer, cardiac valves and a closed hollow cavity formed between the outer sheath layer and the myocardium layer. The wall surface of the outer sheath layer is provided with a through hole used for input or output of liquid (gas) in the hollow cavity. Contraction and relaxation of a heart model can be achieved by changing the pressure in the hollow cavity. The heart chamber simulator can overcome the defect that a contraction and relaxation pressure error is caused by a pump which is used in an external circulation pipeline and solve the problem that a difference between the heart chamber deformation caused by external mechanical loading and the actual myocardial contraction and relaxation process deformation is large, and really reflects the heart chamber beating process deformation and correct circulating pressure relationships.

The invention relates to an elevator sliding guide shoe liner made of ultra-high molecular weight polyethylene and a preparation method for the elevator sliding guide shoe liner. The shoe liner comprises a product B and two products A oppositely arranged on the product B in the length direction of the product B, and the product B and the two products A are combined to form a structure adaptive to an elevator sliding guide shoe in shape. The products A and the product B are prepared from ultra-high molecular weight polyethylene resin or composite materials with ultra-high molecular weight polyethylene resin as the base body through the injection molding process, the mass fraction of the ultra-high molecular weight polyethylene resin in the composite materials is 45%-75%, and the rest is low molecular weight polyolefine resin. Compared with the prior art, the elevator sliding guide shoe liner is made of the ultra-high molecular weight polyethylene composite materials for the first time, and the application of the ultra-high molecular weight polyethylene composite materials to special-shaped products is achieved through the characteristics of superior mechanical properties of high strength and wear resistance, superior chemical corrosion resistance and superior ageing resistance of the ultra-high molecular weight polyethylene.

A high toughness inorganic composite artificial stone panel and a preparation method thereof are disclosed. The panel comprises a surface layer, an intermediate metal fiber toughening layer and a substrate toughening layer. The surface layer comprises the following raw materials in parts by weight: 40 to 70 parts by weight of quartz sand, 10 to 30 parts by weight of quartz powder, 20 to 45 parts by weight of inorganic active powder, 0.5 to 4 parts by weight of pigment, 0.3 to 1 part by weight of water reducer and 3 to 10 parts by weight of water. The intermediate metal fiber toughening layer comprises the following raw material components in parts by weight: 40-60 parts of inorganic active powder, 45-65 parts of sand, 0.8-1.5 parts of water reducer, 6-14 parts of water and 4-8 parts of metal fiber. The substrate toughening layer comprises the following raw material components in parts by weight: 30-50 parts of inorganic active powder, 30-55 parts of quartz sand, 15-20 parts of quartz powder, 0.5-1.2 parts of water reducer, 4-8 parts of water and 0.8-2.5 parts of toughening agent. The panel has the advantages of good volume stability, low shrinkage, no warping deformation in use, extremely low water absorption, good durability, no aging and the like, strong bonding between layers, good ductility and no instant brittle fracture, and can be used as a bearing capacity structure with good surface pollution resistance, and is suitable for popularization and use.

The invention relates to a composite bushing MC nylon wheel belonging to a wheel body structure technology used in the fields of elevator industry and hoisting machinery and other fields. The composite bushing MC nylon wheel comprises a wheel body made of MC nylon and a steel wheel axle concentric with the wheel body; a bearing is arranged between the wheel body and the wheel axle, two steel bushings are arranged on the inner surface of the wheel body and coaxially arranged along the length direction of the wheel body, and another bearing is arranged between one bushing and the wheel axle. The composite bushing MC nylon wheel has the advantages that abrasion and slipping phenomena generated by the direct contact between the MC nylon wheel and the bearing are avoided, the adverse influence of the self characteristics of the MC nylon, such as swelling or shrinking generated by temperature rise or drop, on the bearing and the whole mechanism, i.e. the bearing is loose or moves in a hole, is overcome, vibration generated by the shake of the bearing is stabilized, and the operation service life of the whole mechanism is prolonged.

The invention provides a preparation method of an iron-zinc-tin alloy cathode material. The method comprises the following steps: 1. preparation of a tin electroplating solution; 2. the prepared tin electroplating solution is added into an electroplating bath, a platinum sheet is used as an anode, an iron sheet is used as a cathode, and electroplating is carried out; 3. preparation of an zinc electroplating solution; 4. the prepared zinc electroplating solution is added into the electroplating bath, the platinum sheet in the step 2 is used as an anode, the iron sheet with electroplated tin is used as a cathode, and electroplating is carried out; 5. after electroplating, the iron sheet is cleaned and dried, and the iron-zinc-tin alloy cathode material is obtained.

The invention relates to a single bushing-type MC nylon wheel belonging to a wheel body structure technology used in the fields of elevator industry and hoisting machinery and other fields. The single bushing-type MC nylon comprises a wheel body made of MC nylon and a steel wheel axle concentric with the wheel body; two bearings are arranged between the wheel body and the wheel axle; a steel bushing is arranged among the bearings and the wheel body and provided with a flange edge which is connected with one side of the wheel body by bolts; the inner wall of the bushing is provided with two circular grooves, and two elastic collars are respectively supported inside the two circular grooves; the two bearings are arranged between the two elastic collars, and a lining is arranged between the two bearings and sleeved outside the wheel axle. The invention has the advantages of sliding, deformation and vibration resistance and long service life.

The invention relates to hemp fabric and a preparation method thereof. The hemp fabric is formed by blending cotton fibers serving as warp yarn and hemp cotton yarn serving as weft yarn, wherein the weight ratio of the cotton fibers to the hemp cotton yarn is (56-60):(40-44). The invention further provides a preparation method of the hemp fabric. The preparation method comprises the steps that the cotton fibers and the China-hemp cotton yarn serve as raw materials and are sequentially subjected to a warping process, a sizing process, a denting process and a weaving process to obtain the hemp fabric, wherein in the sizing process, a used sizing agent comprises the following components in parts by weight: 5.0-10.0 parts of vegetable gum, 70.0-80.0 parts of rubber powder and 20.0-30.0 parts of composite starch, and the solid content of the sizing agent is 13.0+/-1%. The obtained hemp fabric is not prone to wrinkling and shrinking, and is resistant to ultraviolet rays and capable of inhibiting bacteria.

The invention discloses an extruding casting technology of an aluminum brass casting outlet terminal. The technology comprises the following steps of melting alloys; manually casting the aluminum brass casting outlet terminal through a fixed-quantity casting ladle with the casting period for each casting being one minute; using 125-MPa extrusion force of a main cylinder to shape and compact the aluminum brass casting outlet terminal and subsequently using 375-MPa extrusion force of a jacking cylinder to perform forging on the castings; making the extrusion speed of male dies for the aluminum brass casting outlet terminal 12 mm/s and the extrusion speed of a push rod 65 mm/s; controlling the dwelling time of the aluminum brass casting outlet terminal within a range between 15 seconds and 20 seconds; using a 2.5-kilowatt electrothermal ring to preheat an aluminum brass casting outlet terminal die for approximately three hours each time before a casting process and controlling a casting mold temperature between 250 degrees and 350 degrees; and spraying the working faces of female dies and male dies through a PQ-1 type spraying gun. The technology provided in the invention has the advantages of simple steps, high casting production efficiency and die service lifetime prolongation.

The invention provides a horizontal type uniform-air-pressure pipe expansion device which includes a workbench, a pipe expansion unit and a flaring unit. The pipe expansion unit is arranged on the workbench, and the flaring unit is arranged at the position, on one side of the pipe expansion unit, of the workbench; the pipe expansion unit includes a first base, a first mounting base, a nozzle and acompacting base, the first base is arranged on a bearing surface and is driven by a first driving unit to move in the axial direction of a heat dissipation pipe, the first mounting base is arranged on the first base, the nozzle is carried on the side, opposite to a pipe opening of the heat dissipation pipe, of the first mounting base, and the nozzle is driven by the first mounting base to achieveinsertion and extraction of the heat dissipation pipe; an inlet of the nozzle communicates with an outlet of an ultra-high pressure gas generator through a pipe; the compacting base is arranged on the side, close to the heat dissipation pipe, of the first mounting base; the compacting base is driven by a second driving unit to do reciprocating linear motion; a plurality of positioning holes are formed in the compacting base, a compacting sleeve is arranged in each positioning hole, and the compacting sleeves penetrate through the positioning holes to protrude out; and the inner walls of the compacting sleeves are provided with sealing pieces.

The invention relates to a double-station press machine which comprises an upper table top and a lower table top that are fixedly arranged vertically, wherein a pair of hydraulic cylinders is arranged on the upper table top; lower ends of piston rods of the hydraulic cylinders are connected with moving table tops respectively; an upper mould is arranged on the bottom surface of each of the moving table tops; a lower mould which is coaxial with and opposite to each of the upper moulds is arranged on the lower table top; an upper cutter saddle is arranged on one side of each of the moving table tops; a lower cutter saddle is arranged under each of the upper cutter saddles; and cutters suitable for matching vertically are arranged on the upper and lower cutter saddles. The double-station press machine solves the problems that the product surface has break marks, wrinkles, shrinkage and deformation, the yield is low, and the operation is complicated when glasswork with high requirements, such as an optical glass lens, is produced in the prior art. With the adoption of the double-station press machine, the product qualification rate and the yield are increased and the working load is reduced. The practical data shows that the product qualification rate is increased by about 30% and the yield is increased by about 25%.

The process of making stone-imitating ceramic tile includes the following steps: flow casting several ceramic color pastes in different colors in some carrier, pre-drying to obtain color paste adobe of certain water content, pressing inside a mold in a press, stoving, calcining and polishing. Pressing after pre-drying can ensure high density, fine and flat surface of product and the aesthetic sense similar to that of natural stone material.

The invention provides a flame-retardant heat insulation material for a solar water heater and a preparation method of the flame-retardant heat insulation material. The flame-retardant heat insulationmaterial comprises the following raw materials in parts by weight: 80-100 parts of polyether polyol, 110-130 parts of isocyanate, 1-5 parts of carbon nanofibers, 5-10 parts of modified expanded vermiculite, 2-5 parts of foaming agent, 0.1-0.5 part of foam stabilizer, 0.5-2 parts of catalyst, 0.5-1 part of crosslinking agent and 4-10 parts of water. The flame-retardant heat insulation material provided by the invention has favorable strength and heat insulation property, also overcomes the defect of high shrinkage after foam molding and has good flame retardance.