368results about How to "Reduce rebound rate" patented technology

A heat sink assembly includes a heat sink with a base plate having a top surface with fins for dissipating heat and an opposed bottom surface for placing against an electronic device mounted on a printed circuit board, and at least one connecting device for loading the heat sink against the electronic device. The connector includes a mechanical fastener such as a push pin having an end which engages the circuit board, a compression spring received against a shoulder on the fastener, and a cup member which is installed in an aperture in the base plate so that a floor of the cup member provides a bearing surface for the spring which is below the bottom surface of the base plate. An alternative connector utilizes a conical spring received through the base plate and receiving the fastener therein to load the spring in tension against the electronic device.

A vehicle stabilizer bar assembly having a pair of stabilizer bar members that are selectively uncoupled via a clutch. The clutch includes a moving element that can be selectively moved via an actuator to effect the uncoupling of the stabilizer bar members. The actuator is configured to apply a force to the moving element concentrically about the axis along which the moving element translates. The clutch is configured to transmit torque from one of the stabilizer bar members to the other stabilizer bar member concentrically about the axis. A method for operating a vehicle stabilizer bar assembly is also provided.

The invention relates to a method for preparing polymer polyol with high solid content and low viscosity. The method adopts an intermittent method or a continuous method, and uses a basic polyether polyol as a continuous phase to perform in situ polymerization on a vinyl monomer, polyether polyol, a dispersing agent, and a chain transfer agent under the action of a free radical initiator to produce the polymer polyol with high solid content and low viscosity; or the method uses a certain amount of the polymer polyol with target solid content as a substrate material, mixes the raw materials such as the basic polyether polyol, the free radical initiator, the vinyl monomer, the dispersing agent, and the chain transfer agent evenly according to certain mixture ratio, and adds the mixture to the substrate material continuously to be polymerized so as to obtain the polymer polyol with high solid content and low viscosity. The polymer polyol produced by the method has the advantages of low viscosity, stable dispersion of solid particles, small average particle size of the solid particles, and even particle size. The polymer polyol improves the physical mechanical properties of products applying the polymer polyol, and has wide application range.

The invention discloses a preparation method of a novel alkali-free liquid accelerator. The ingredients and the proportion of the accelerator are as follows: 30-50% of aluminum sulfate, 10-20% of aluminum citrate, 2-10% of hydroxycarboxylic acid, 5-10% of ammonium hydroxide at the concentration of 20%, 0.01-0.05% of polyacrylamide and the balance of water. The preparation method comprises the following technological production steps: feeding the raw materials into a reaction kettle according to different feeding sequences, heating and uniformly mixing the raw materials at 60-80 DEG C, and cooling the mixture to obtain a colorless or light green thick liquid. The preparation method disclosed by the invention has the following advantages that due to the introduction of multi-hydroxyl functional group molecules, the coordination crosslinking of an aluminum crosslinking system and polyacrylamide molecules is promoted, a composite aluminum citrate crosslinking system with high activity is prepared, the hydration rate of cement is obviously increased, and furthermore the action effect of the accelerator is enhanced. The setting time of the cement mortar doped with the accelerator is greatly shortened, the initial setting time is shorter than 2 minutes, the final setting time is shorter than 6 minutes, the 1d (Day) compressive strength is higher than 10MPa, and the 28d compressive strength rate is higher than 140%.

The invention relates to a railway car truck incorporating a novel interconnection between the side frame and bearing adapter characterized by a low lateral spring constant relative to the longitudinal spring constant. The interconnection provides a proportional restoring force with minimal internal friction and hysteresis. In embodiments, the interconnection comprises compressed elastomeric members positioned between the thrust lug of the side frame and the bearing adapter in the longitudinal direction and a low friction interface between the roof of the pedestal jaw and the top of the bearing adapter.

The invention discloses an alkali-free liquid setting accelerator for shotcrete and a preparation method thereof; the setting accelerator comprises the following raw materials: aluminum sulfate, an acidity regulator, aluminum hydroxide, organic alcohol amine, an early strength agent, a dispersant, an anti-settling agent and water. The preparation method comprises the steps: firstly adding water into a reactor, starting to stir, sequentially adding the dispersant, the anti-settling agent and the acidity regulator, and starting to heat; when the solution is heated to 90 DEG C-100 DEG C, adding aluminum hydroxide and the early strength agent, and stirring and carrying out heat preservation at the temperature of 80-90 DEG C; after completion of heat preservation, adding aluminum sulfate and completing addition in batches, and keeping the temperature of the system at 80-100 DEG C; after completion of addition, carrying out heat preservation for half an hour until the solution is clarified;and finally adding organic alcohol amine, and after completion of addition, carrying out heat preservation for 2-3 hours. The setting accelerator has the characteristics of wide cement adaptability, stable performance, good storage stability and the like. Besides, the shotcrete using the setting accelerator has the characteristics of low mixing amount, low resilience rate, low dust pollution and the like.

The invention discloses a continuous rolling process for a lithium-ion battery electrode and a device thereof. The process is characterized in that an electrode plate adopts a low-temperature hot rolling process. The used device is characterized in that a heating device is increased between an unrolling shaft and a roll. The process has the advantages of ensuring the dryness of the electrode, increasing the plasticity of the electrode plate, reducing the rebound rate of the rolled electrode plate and properly increasing the single-side density of the electrode plate, thereby promoting the volume rate capacity of the battery; and the device has a simple structure and convenient operation.

A vehicle stabilizer bar assembly having a pair of stabilizer bar members that are selectively uncoupled via a clutch. The clutch includes a plurality of engagement pins that can be selectively moved via an actuator to effect the uncoupling of the stabilizer bar members. The actuator is configured to apply a force to the moving element concentrically about the axis along which the moving element translates. A method for operating a vehicle stabilizer bar assembly is also provided.

The invention discloses an electro-hydraulic forming device for a pipe fitting and a forming method. The electro-hydraulic forming device comprises a bulging die, a power source, a water pipe, a water storage tank, an aqueous medium, a metal wire, a positive electrode and a negative electrode. The metal wire is made to penetrate through the installed positive electrode, the pipe fitting to be formed and the negative electrode in sequence, and the positive electrode and the negative electrode are installed in the two ends of the pipe fitting respectively. Water is injected into the sealed pipe fitting. High-energy pulses are transmitted to the metal wire through a wire, in this way, the size of the metal wire is increased rapidly after the metal wire is gasified due to heating, impact waves are generated in the medium around the metal wire, the impact waves act on the pipe fitting, the required pipe fitting is obtained through bulging through electro-hydraulic forming based on discharging of the metal wire. The forming performance of materials is improved, the rebound rate is reduced, the forming precision of the pipe fitting is improved, in this way, a part with the forming quality and precision meeting requirements is obtained, and the pipe fitting is promoted to burgle.

The invention discloses a low-resilience liquid accelerator for shotcrete and a preparation method thereof. The accelerator is prepared from the following raw materials in percent by mass: 20%-40% of sodium hydroxide, 25%-40% of aluminium hydroxide, 3%-10% of a synergist, 0.5%-2% of a setting accelerator, 0.003%-0.02% of a viscosity adjusting agent, and the balance water, wherein, the synergist is sodium silicate, the setting accelerator is an alcohol amine substance, and the viscosity adjusting agent is potassium chromate or sodium nitrite. The preparation method comprises the following technical steps: adding sodium hydroxide and the synergist into a reaction kettle, adding water, and starting an agitator and a heater; keeping the temperature after the temperature reaches a set temperature, adding aluminium hydroxide, and reacting with the constant temperature; adding the viscosity adjusting agent, stirring, heating, reacting with a constant temperature, then stopping heating, and naturally cooling; and adding the setting accelerator after the reaction system is cooled, and cooling to room temperature, so as to obtain the accelerator. The accelerator is short in setting time, low in resilience and moderate in viscosity, generates a little sediment, has good cement adaptability, and the preparation method for the accelerator is simple, practicable and energy-saving.

The invention provides a cobalt-chromium alloy artery stent with full-biodegradation medicine coating; the full-biodegradation coating of the stent has good stent flexibility, pathological change permeability and radial bearing force; the invention further provides a preparation method of the stent; multi-level coating applying technology, metallic support surface inert gas processing process and the like are adopted, the firmness of the stent surface coating, the toughness and tensile strength thereof are greatly improved, thereby being beneficial to keeping the integrity of the coating; in addition, the invention provides a cobalt-chromium alloy artery stent with full-biodegradation medicine coating, which is prepared by radial grading squeezing process, the damage of the coating can be avoided to the greatest extent, the retention force between the stent and a conveying system is greatly improved, the possibility that the stent is migrated in the conveying process is avoided, the clinical using risk is reduced, and the problems of coronary artery stenosis and restenosis are effectively solved.

The invention provides a preparation method of a nano-silica powder-based super composite thermal insulation material. Nano-silica powder and a functional additive are taken as raw materials, the nano-silica powder accounts for over 60% of total weight of the raw materials and the functional additive at least comprises reinforced fibers; the preparation method comprises the steps of stirring and dispersing the reinforced fibers at a rotating speed of 400-1,000r/min for 0.5-1.5 minutes; mechanically fusing the dispersed reinforced fibers, the nano-silica powder and other functional additives to complete coating modification on the surface of the functional additive by the nano-silica powder; and making the fused materials in full contact with steam at 80-85 DEG C for 28-32 minutes, extruding air and carrying out pressing, molding and drying to obtain the high-performance nano-silica powder-based super composite thermal insulation material. According to the preparation method, the supercritical drying process with strict conditions in an existing preparation technology is abandoned; and the nano-silica powder-based super composite thermal insulation material with excellent performance is prepared through a simple dry process.

The invention discloses a high-performance chlorine-free alkali-free liquid accelerating agent which is prepared from the following materials by weight percent: 6 to 15 percent of magnesium aluminum fluoride, 20 to 50 percent of aluminum sulfate, 2 to 6 percent of organic amines, 0 to 2 percent of stabilizer, and the balance of water. The production process comprises the following steps of: adding water at the given weight percent to a stirring drum, adding magnesium aluminum fluoride and stirring to dissolve, adding organic amines and stirring to dissolve, adding aluminum sulfate and stirring to dissolve, and making the final product. The high-performance chlorine-free alkali-free liquid accelerating agent is free of chlorine and alkali and non-corrosive to human beings and steel-bar-made machines, and has the advantages of long holding period, low addition amount, quick setting action, low rebound rate, high one-day strength, substantially no loss of long-term strength and good material compatibility. The production process is simple, pollution-free and noise-free, does not produce gas discharge or waste water, and is safe and environment-friendly. The materials are abundant, the production cost is low, and the social and economic benefits are extremely good.

Belonging to the technical field of construction engineering, the invention in particular relates to an admixture special for high performance shotcrete. The special admixture comprises two main components: a cohesive component and an early strength component in a mass ratio of 60-70:30-40. Specifically, the cohesive component is a mixture of modified latex powder and a superfine mineral admixturein a mass ratio of 20-30:70-80, and the early strength component is high activity tricalcium aluminate. Through the synergistic effect of the cohesive component and the early strength component, thespecial admixture provided by the invention effectively improves the cohesiveness and early strength of shotcrete, thereby reducing the resilience of shotcrete and improving the compactness. The material can provide an effective way for really realizing high performance of shotcrete.

The invention provides a coal mine wet method guniting process and belongs to the technical field of coal mine wet method guniting. The coal mine wet method guniting process comprises the following steps of 1.1 manufacturing mixed dry materials, namely performing dry mixing of a sand and stone mixed material, cement, coal ash, a water reducing agent, fiber and an accelerator to form the mixed dry materials; 1.2 performing dry material transportation, namely transporting the mixed dry materials to a guniting working face under a coal mine; 1.3 manufacturing wet slurry, namely pouring the mixed dry materials into a stirring, conveying and guniting integrated machine and simultaneously adding water to perform stirring to form evenly-mixed wet slurry; 1.4 performing guniting operation, namely utilizing a plunger type wet spraying machine (11) to perform continuous and quick guniting operation to the working face needing guniting; and 1.5 cleaning a pipeline, namely cleaning the guniting pipeline of the plunger type wet spraying machine (11), keeping the pipeline to be clean and preventing blockage. By means of the coal mine wet method guniting process, dry mixing, conveying, stirring, guniting and other processes are tightly combined integrally, the processes are compact, manpower is saved, the efficiency is improved, guniting materials are even and consistent in proportion, and the guniting effect is remarkable.

The invention relates to a conductor wire core for a novel power cable, comprising an inner-layer molded wire and an outer-layer molded wire. The molded wires are produced by a molded wire filament drawing machine of which a molded wire filament drawing mold has the finish of less than 5; the single filaments of the inner-layer molded wire adopt round wires or combined round wires formed by combining 2 to 6 filaments with fan-shaped cross sections; the single filaments of the outer-layer molded wire are shaped like tiles and spirally stranded towards the same direction by using a frame-type strander; and the stranded wire core has a round cross section. The external diameter of the conductor wire core can be effectively reduced, and the consumption of outer-layer materials of the power cable can be saved. The conductor wire core has a smooth surface so that the risk of insulation breakdown is reduced. In addition, the rigidity and bend radius of the power cable are reduced so that the related power cable can be laid more conveniently.

Suspension systems, leaf springs and methods of providing a leaf spring in a suspension system are disclosed. The suspension systems, leaf springs and methods of providing a leaf spring in a suspension system allow use of a lighter weight leaf spring while providing customized roll stiffness and vertical spring rate that are complemented by a bumper that engages the leaf spring assembly when compressed to at least a preselected position.

The invention discloses a concrete gel material which comprises cement and silica solution. The invention further discloses a high-performance concrete for tunnel prepared through the concrete gel material provided by the invention. The high-performance concrete is suitable to be applied to injecting concrete, moulding concrete and others. Through the adoption of the concrete gel material or the high-performance concrete for the tunnel provided by the invention for injecting the concrete, the rebound ratio can be effectively reduced and even reduced to 4.1% to the minimum; and the concrete gel material or the high-performance concrete is good in working performance; the obtained concrete finished product is high in early strength, and good in freezing resistance; the waterproof performance and the wearable performance are improved; the quantity of used cement can be reduced; the carbon emission can be reduced; and good economic benefit and environment-friendly benefit are brought.

The invention provides a rapid roadway construction method for soft and broken surrounding rocks of a deep coal mine and a support system. The rapid roadway construction method for the soft and broken surrounding rocks of the deep coal mine includes the steps that a concrete leveling layer is sprayed to the roadway surrounding rocks in a wet mode; a plurality of grid arches are tightly attached to the concrete leveling layer at preset intervals; mounting anchor rods are arranged on the grid arches in a drilling mode; the grid arches are connected through longitudinal linkage ribs; a first layer of reinforcing mesh and a second layer of reinforcing mesh are laid along a roadway, wherein the first layer of reinforcing mesh is bound with the inner side main ribs, close to the surrounding rocks, of the grid arches, and the second layer of reinforcing mesh is bound with the outer side main ribs, away from the surrounding rocks, of the grid arches; concrete is sprayed again for filling of gaps among the grid arches, the two layers of reinforcing meshes and the surrounding rocks; a concrete layer is sprayed again to completely cover the grid arches; prestress grouting anchor cables are manufactured on the grid arches to support the surrounding rocks. By the method, the soft and broken surrounding rocks can be rapidly and effectively supported, and material waste and adverse impact on the environment are reduced to the maximum extent in the construction process.