Showing papers on "Reducer published in 2012"

Syngas Chemical Looping Process: Design and Construction of a 25 kWth Subpilot Unit

Abstract: The syngas chemical looping (SCL) process employing the gas–solid counter-current flow pattern demonstrates an innovative approach to generate hydrogen and/or electricity from syngas accompanied with in situ carbon capture. Iron-based oxygen carriers donate oxygen for complete syngas conversion in the reducer. The reduced oxygen carriers are then oxidized by steam and/or air to generate hydrogen and/or heat in the oxidizer and/or the combustor, respectively. Previous studies have reported the performance of the iron-based oxygen carriers, the advantages of a moving bed reducer and oxidizer, and simulation of various parametric effects on the reactor design of the reducer, oxidizer, and combustor for a continuous system. In this study, a 25 kWth subpilot SCL unit was designed based on the simulated criteria and constructed to demonstrate the feasibility of generating high purity hydrogen with in situ carbon capture. Two test runs were presented using 4.5 mm × 2.5–4.5 mm cylindrical oxygen carriers comprisi...

Balancing reducer skew in MapReduce workloads using progressive sampling

Abstract: The elapsed time of a parallel job depends on the completion time of its longest running constituent. We present a static load balancing algorithm that distributes work evenly across the reducers in a MapReduce job resulting in significant elapsed time reductions.Taking a user-specified model of reducer performance, our load balancer uses a progressive objective-based cluster sampler to estimate the load associated with each reduce-key. It balances the workload using Key Chopping, to split keys with large loads into sub-keys that can be assigned to different distributive reducers, and Key Packing, to assign keys with medium loads to reducers to minimize the maximum reducer load. Keys with small loads are hashed as they have little effect on the balance. This repeats until the user specified balancing objective and confidence level are achieved.The sampler and load balancer have been implemented in the Oracle Loader for Hadoop (OLH), a commercial MapReduce application that employs Apache Hadoop to perform parallel data formatting and data movement into partitioned relational tables. We present the performance improvements we achieve in both OLH and in a MapReduce program for inverted index creation. The balancer works for arbitrary IID key distributions, the time used for sampling is small and our solution is very effective at reducing the elapsed time for the MapReduce jobs we explored.

Method for checking an m out of n code

Abstract: A method and a circuit system for checking an m out of n code are provided. The method uses a code checker, to which at least one code reducer is assigned, a reduction of the code word width to in each case half being carried out using the at least one code reducer until a 1 out of x (x=n/2, n/4, n/8 . . . ) code or another code which is not reducible further in this way is provided, each step of the code reducer additionally being connected to different bits of a counter, the 1 out of x code or the code which is not further reducible being checked and additionally the signal pairs of each step being checked.

Computational And Experimental AnalysisOf The Churning Power Losses In An IndustrialPlanetary Speed Reducer

Abstract: Advantages of planetary speed reducers are well known and due to their compact design and power density they are suitable for a wide range of applications. Efficiency is becoming more and more of a main concern in the design of power transmissions and the demand for high efficiency gearboxes is continuously increasing. For this reason it is important to have some models in order to quantify the power losses of those already during the design stage. Some theoretical or semi-empirical models that allow us to estimate losses like those of bearings, of seals, of gear meshing (due to sliding) and, for ordinary gears, those of churning are available in literature. In the case of planetary speed reducers, where the motion of the planet carrier causes a rotatory motion of the planets around the axis of the gearbox, the oil splash lubrication is an important source of losses. This report introduces a multiphase CFD model for the prediction of the churning losses characteristic of planetary gears. The analysis has been carried out by means of an unsteady Volume of Fluid (VOF) model and implemented on a commercial software (Fluent). The whole geometry of the speed reducer and many operating conditions like the rotational speed, the oil level and the operating temperature have been taken into account. Moreover the results of an experimental testing campaign on an especially designed gearbox are presented and compared with the computation ones in order to validate the model. The two approaches give results in good agreement.

Comprehensive experiment table for performance parameters of harmonic reducer of robot

Abstract: The invention discloses a comprehensive experiment table for performance parameters of a harmonic reducer of a robot, which belongs to the technical field of harmonic reducers and comprises a base, a load application device, a sliding seat, a servo motor and a control unit, wherein the load application device is mounted on the base, an input end of the load application device is connected with a flexible gear of the harmonic reducer, the sliding seat is slidably mounted on the base, slides towards the load application device and is provided with a fixing support for fixing a rigid gear of the harmonic reducer, the servo motor is slidably mounted on the sliding seat and slides towards the fixing support, a power output shaft of the servo motor is connected with a wave generator of the harmonic reducer, and the control unit is used for processing information and recording parameters and is connected with the servo motor and the load application device The comprehensive experiment table is convenient in operation, is capable of truly and accurately detecting the performance parameters of the harmonic reducer, and is widely applied to detecting the performance of the harmonic reducer

Pressure arm-type automatic pipe welding machine

Abstract: The utility model relates to a pressure arm-type automatic pipe welding machine, which belongs to the technical field of automatic welding equipment. The pressure arm-type automatic pipe welding machine mainly comprises a base, a two-head left and right threaded rod and nut pair, a hand gun, a driving roller, a driven roller, a pressing wheel, a pressure arm, a lifting motor speed reducer, a lifting screw rod and nut pair, an extensible arm, an upright post and a lifting rail, a welding machine head and a wire feeding machine. In the pressure arm-type pipe pressing mechanism, the welding machine is provided with a driving mechanism for rotating the pipe, the pressure arm is provided with a power cross arm, and the welding machine head is provided with the vertical electric sliding plate, a horizontal manual sliding plate and a precise swinging device, so that the pressure arm-type automatic pipe welding machine is applicable for precise positioning of a pipe welding position and precise regulation of the welding gun up and down and left and right; the use of a pipe welding preheater is facilitated; and the actual working efficiency and the welding quality are effectively improved.

Reducer shell-drilling-and-tapping turnover jig

Abstract: The invention relates to a reducer shell-drilling-and-tapping turnover jig, which comprises a bottom plate and supports arranged on both ends of the bottom plate. The turnover jig has the following characteristics that: a reducer shell-clamping unit is arranged between the two supports, both ends of the reducer shell-clamping unit are connected with the supports through rotary shafts, and a rotating cylinder for controlling the reducer shell-clamping unit to rotate is mounted on one of the rotary shafts. When the turnover jig is used, a reducer shell is fixed between the two supports by the reducer shell-clamping unit, and the rotating cylinder drives the reducer shell-clamping unit and the reducer shell on the reducer shell-clamping unit to rotate by 180 degrees, so that the back of the reducer shell faces upwards and can be drilled and tapped. The turnover jig is driven by cylinders to clamp and rotate the reducer shell, and does not need to be manually operated, consequently, the labor intensity of operators is reduced, and the production efficiency is increased.

Preparation method of concrete polycarboxylate water-reducer at normal temperature

Abstract: The invention discloses a method for preparing concrete polycarboxylate water-reducer at normal temperature without heating or using organic solvent. The preparation method comprises the following steps that: a. unsaturated polyoxyethylene is dissolved into water, added with comonomer, molecular weight regulator and oxidant, stirred and mixed uniformly; b. reducer and the rest comonomer are dripped to be polymerized; and c. sodium hydroxide solution is added to be neutralized and cured. The polycarboxylate water-reducer of the invention adopts a radical polymerization method and takes water as the solvent. A whole synthesis process does not need heating, does not use organic solvent, saves energy and does not produce pollution. The preparation method of the concrete polycarboxylate water-reducer at normal temperature can solve the heating and the temperature control problems in the past polycarboxylate water-reducer production, reduces the use of fuel so that the polycarboxylate water-reducer becomes a real clean and environmental-firendly product, is a novel process method, can be applied to industrial production in a large scope, and brings considerable economic benefit.

Nanometer drag reducer for sandstone surface pretreatment and preparation method of nanometer drag reducer

Abstract: The invention relates to a nanometer drag reducer for the sandstone surface pretreatment and a preparation method of the nanometer drag reducer. The nanometer drag reducer comprises following components: 5-15% of nano-silica material modified by a silane coupling agent, 25-50% of surfactant and 40-70% of cosurfactant, wherein the surfactant is one or two kinds of an anion active agent, a cation surface active agent, a non-ionic surface active agent and an amphoteric surfactant. The nanometer drag reducer has the advantages that the nanometer drag reducer can be mixed with water in a certain proportion to form an uniform and transparent micro-emulsion, and diesel is replaced by water in the work progress, so that the construction cost is greatly lowered; the nanometer drag reducer can be firmly adsorbed on the surface of rocks so as to form a layer of strong nano hydrophobic membrane, so that the flow resistance of the formation water is effectively reduced and the water flooding effect is enhanced.

Working tower, rod inserter, rod reducer, and compression-distraction tool for minimally invasive surgery system

Abstract: A working tower for gripping a correction screw during minimally invasive surgery and playing a role of a working surface for other external devices is provided, which includes an exterior pipe, an interior pipe slidably provided within the exterior pipe, a driving sleeve rotatably connected to the exterior pipe and screw-coupled to the interior pipe to move the interior pipe upward and downward along a lengthwise direction thereof during rotation, and a screw holder provided on a lower end of the interior pipe, and is elastically split apart to receive a head portion of the correction screw when withdrawn from the exterior pipe, and contracted to securely hold the head portion when inserted into the exterior pipe.

Marine engineering self-compacting high-performance concrete and preparation method thereof

Abstract: The invention provides marine engineering self-compacting high-performance concrete, which comprises the following raw material components in part by weight: 450 to 540 parts of gel material, 1,640 to 1,725 parts of aggregate, 7 to 8 part of polycarboxylic acid water reducer and 160 to 175 parts of water, wherein the gel material, based on the total weight of the gel material, consists of 30 to 45 percent of type-II 52.5 portland cement, 20 to 40 percent of fly ash and 30 to 50 percent of slag powder. The self-compacting high-performance concrete doped with fly ash and slag has high flowability, fallibility, high passing capacity and high segregation-resistance stability. In addition, the marine engineering self-compacting high-performance concrete also has long-lasting chlorine salt corrosion resistance, high freezing resistance and high thermal performance.

Reduction differential gear apparatus for electric vehicle

Abstract: An object is to reduce various losses occurring in a speed-reduction/differential gear apparatus for electric vehicles including a planetary-gear speed reducer and a differential device, thereby improving transmission efficiency of the driving force and increasing travel distance of the electric vehicle per battery charge. A speed-reduction/differential gear apparatus for electric vehicles includes a planetary-gear speed reducer and a differential device. A planetary gear mechanism in the speed reducer includes a speed-reducer-side carrier which has its inner diameter surface supported by a speed-reducer-side carrier support bearing. The invention provides proper mesh between in the pair of engaging teeth, leading to decrease in loss torque.

General reducer test bed

Abstract: The invention discloses a general reducer test bed, which comprises a test bed base, a driving unit for driving a main test reducer, a first mounting bracket for setting the main test reducer and a loading unit for providing a load for the main test reducer, wherein the driving unit is arranged on the test bed base; and at least one of the first mounting bracket and the loading unit is arranged on the test bed base in a position adjustable mode, so that the distance between the first mounting bracket and the loading unit is adjustable. Based on the test bed base, the driving unit, the loading unit and the first mounting bracket are arranged on the test bed base, the distance between the first mounting bracket and the loading unit is adjustable, and the basic general reducer test bed is formed; and the general reducer test bed can be applied to reducers with different sizes.

Yaw drive method and device for wind power generator

Abstract: A speed reducer and a yaw drive apparatus for a wind power generation apparatus, where the speed reducer has high efficiency and a short axial length, and suitable for the yaw drive apparatus. The speed reducer has three stages for speed reduction. The total reduction gear ratio of a first stage speed reducing portion (10) and a second stage speed reducing portion (20) is set at 1/6 to 1/60, and a third stage speed reducing portion (30) is constructed from an eccentric oscillating-type speed reducing mechanism having an internal-geared gear body (32), external gears (34), crankshafts (35), and a carrier (37). The reduction gear ratio of the eccentric oscillating-type speed reducing mechanism is set at 1/50 to 1/140, and the total reduction gear ratio of the speed reducer is set at 1/1000 to 1/3000. A yaw drive method and the yaw drive apparatus can reduce noise, and the yaw drive apparatus is inexpensive and reduced in size.

Epicyclic gear reducer for blower module of turbojet i.e. double-flow turbojet, has set of planetary carriers comprising positioned radial extension, and oil guided or ejected towards radial end of reducer by centrifugal force

Abstract: The reducer has a movable sun gear that rotates about an axis of rotation, and a set of bevel pinions (12) that is driven by the movable sun gear, where the set of bevel pinions is movable in rotation about a set of planetary gear axes. A set of gears is formed by the set of bevel pinions, and a ring (14) is formed to axially eject lubrication oil after usage of the oil. A set of planetary carriers (13) comprises a positioned radial extension, and the oil is guided or ejected towards a radial end of the reducer by centrifugal force. An independent claim is also included for a blower module.

Sewage filter plant

Abstract: The invention discloses a sewage filter plant, which comprises a support, a water inlet channel, a rotating disc, a rotating shaft, a water scouring sprayer, a driving motor and a speed reducer. Two filters capable of switching are arranged on a suction opening pipeline of a water pump, a pressure sensor automatically detects a water pressure setting value, when blocked, a filter screen is automatically replaced and cleaned, the total process is finished instantly, and the water pump does not stop. The sewage filter plant has the advantages of simple structure, low cost and power consumption, capabilities of effectively avoiding blockage due to dirt and guaranteeing stable operation of a system, and the like.

Automatic bending machine for simple pipe fitting

Abstract: The utility model relates to an automatic bending machine for a simple pipe fitting, comprising a rack, a workbench on the rack, a bending structure in the middle of the workbench, as well as a pipe fitting clamping structure and a bending length positioning plate respectively arranged at two sides of the bending structure The automatic bending machine is characterized by also comprising a motor and a speed reducer connected with the output end of the motor, wherein the bending structure comprises a driving disc structure which is fixedly connected with the output end of the speed reducer, and installed in a flange cover fixed on the workbench by a bearing, the upper end of the driving disc structure is fixed with a U-shaped bracket, centering wheels rotating along the axis are arranged at the position in the U-shaped bracket, align with the center of the driving disc, and a bending wheel set capable of swinging is arranged at the position in the U-shaped bracket, close to the closing end; and the workbench is also provided with a sensor for conducting reset detection on the bending structure In the utility model, the driving disc structure is connected with the output end of the speed reducer, the automatic bending of the pipe fitting can be realized, the work efficiency is improved, the labor intensity of workers can be reduced, and due to the arrangement of the sensor, the automatic resetting of the bending structure can be realized, the pipe fitting can be assembled conveniently

Static torsional and torsional fatigue test bed for automobile transmission shaft

Abstract: The utility model belongs to the field of an automobile power transmission driving test system and particularly relates to a static torsional and torsional fatigue test bed for an automobile transmission shaft. One end of the test bed is provided with a main speed reducer; the other end of the test bed is provided with a static torque sensor; a clamping space for the tested transmission shaft is formed between the main speed reducer and the static torque sensor; a corner sensor is arranged at the side of an output shaft of the main speed reducer; the static torsional and torsional fatigue test bed also comprises a driving motor for driving the main speed reducer; and both the main speed reducer and the static torque sensor are fastened and connected together with a base of the test bed. The test bed designed by the utility model meets a static torsional rigidity and torsional strength test for the automobile transmission shaft, which is required by the QC/T523-1999 automobile transmission shaft bench test method and technical condition. In the maximum torque range allowed by the test bed, the static torsional tests and the torsional fatigue tests can be carried out on various transmission shaft parts, automobile rear axles and steering engine structural parts by replacing a fixture corresponding to a wedge-shaped connecting flange plate to carry out connection and installation.

Novel submarine pipe soil interaction model test platform

Abstract: The invention provides a novel submarine pipe soil interaction model test platform which comprises a model pipe, a power device and a model slot provided with a simulated seabed. The novel submarine pipe soil interaction model test platform is also provided with an upright post, a cross beam, a clamping plate, a speed reducer, a steel wire rope, a pulley, a fixed pressing plate, a fastening bolt, a vertical power device, a transverse power device, a connecting mechanism, a pull wire type displacement sensor, a bending moment strain gauge, a pore water pressure sensor, a soil reaction force sensor, a model pipe folding and unfolding device, a hydraulic servo system and a data collection system. The novel submarine pipe soil interaction model test platform has the beneficial effects that the model test study of submarine pipe soil interaction characteristics under the deep sea complex cyclic dynamic load environment can be realized, and the model test efficiency and the result accuracy are improved to play huge promoting and pushing roles in further understanding the submarine pipe soil interaction characteristics.

Water-plastic retaining polycarboxylic acid water reducer and method for preparing same

Abstract: The invention provides water-plastic retaining polycarboxylic acid water reducer and a method for preparing same, belonging to the technical field of the cement dispersant. The water-plastic retaining polycarboxylic acid water reducer is characterized by being prepared in nature through copolymerizing a big water-plastic retaining monomer and a small water-plastic retaining monomer, wherein the big water-plastic retaining monomer is prepared by mixing a big ester monomer with a small ester monomer. Prepared from the big water-plastic retaining monomer, the water-plastic retaining polycarboxylic acid water reducer can well retain the water and the plastic of concrete which is prepared through stirring different cement and different aggregate, and the ubiquitous problems of the segregation due to water bleeding and the quick slump loss are effectively solved. The water is used as solvent for the polymerization reaction, which is good for the industrial production and ensures the safe and environmental-friendly production process.

Simulator for estimating life of robot speed reducer

Abstract: A simulator ( 10 ) for estimating a life of a speed reducer includes a rotation speed and load calculator ( 21 ) for simulating the operation program of a robot ( 12 ) and calculating the rotation speed of the robot speed reducers (G 1 -Gm) and the load exerted on the individual speed reducers; a storage ( 22 ) for chronologically correlating the rotation speed and the load and storing the rotation speed and the load; a speed reducer life calculator ( 23 ) for calculating the life of the individual speed reducers, based on the rotation speed and the load; an operating ratio setter ( 24 ) for setting an operating ratio of the robot; and a speed reducer life estimator ( 25 ) for estimating the life of the speed reducers, based on the life of the individual speed reducers and the operating ratio.

Method for synthesizing polycarboxylic acid high-property water reducer by copolymerization of amidated active monomers

Abstract: The invention discloses a method for synthesizing polycarboxylic acid high-property water reducer by copolymerization of amidated active monomers, belonging to the field of water reducer. In the invention, the polycarboxylic acid high-property water reducer material is prepared by a method of first amidation and second copolymerization, namely, taking a (methyl) acrylic monomer and methoxyl polyoxyethylene ether with the other end containing amino as reactant, preparing a polymerizable monomer by amidation reaction under the action of catalyst, then copolymerizing the polymerizable monomer with the (methyl) acrylic monomer and a chain transfer monomer in water solution under the action of initiator, and then neutralizing with alkaline solution, thus preparing the polycarboxylic acid high-property water reducer. The method is low in cost, environment-friendly and free from pollution and achieves high polymerization degree and strong controllability; by copolymerization of amidated active monomer, an amide structure is introduced into the molecular structure of polycarboxylic acid water reducer, cement can obtain good flowing property, the flowing capacity maintaining capability of neat cement paste is improved obviously, excellent cement adaptivity is shown, and excellent flowing effect can be obtained under low doping quantity and low water-ash ratio.

Method for synthesizing polycarboxylic acid water reducer

Abstract: The invention relates to a method for synthesizing a polycarboxylic acid water reducer without stirring at normal temperature. The method comprises the following steps of: dissolving reaction raw materials, an initiator, a chain transfer agent and an accelerant into a solvent, and standing at the temperature 0-50 DEG C for reacting; and adding a neutralizing agent at the end of the reaction. The invention has the advantages: a low temperature reaction in an oxidation reduction system is undergone, the method is suitable for a plurality of reaction raw material monomers, the feeding speed is not required to be controlled, extra heating is not required, stirring is not required in the reaction process, operation steps in the conventional process are greatly simplified, large-scale production is realized, and small-scale production can be conveniently performed at construction fields by using concrete at any time.

Driving modules with hollowness

Abstract: PURPOSE: A driving module with hollowness is provided to prevent a cable from being twisted by arranging a second encoder for detecting a real rotation angle of a first driving link in a rotor of a hollow motor CONSTITUTION: A first driving link(310) is connected to an output side of a reducer(200) The reducer is connected to a rotary shaft(130) and reduces speed of the rotary shaft A first encoder(400) is located on an input side which is opposite to a side connected to the reducer The first encoder detects a rotation angle of a hollow motor(100) A second encoder(500) rotary shaft on the opposite side to the side connected to the hollow motor The second encoder detects an output rotation angle of the reducer

Water-soluble thick oil viscosity reducer

Abstract: The invention discloses a water-soluble thick oil viscosity reducer belonging to the technical field of emulsified viscosity reducers of viscous crude oil. The water-soluble thick oil viscosity reducer is prepared from the following components in parts by weight: 0.01-1.0 part of surface active agent, 0.01-1.0 part of dispersant and 0.01-0.6 part of demulsifier, wherein the surface active agent is a nonionic surface active agent selected from OP-10, TX100, Span80 and Tween80, the dispersant is a water-soluble polymer material selected from polyacrylamide, polyvinyl alcohol, guar gum and cellulose, and the demulsifier is a polyoxyethylene-polyoxypropylene segmented copolymer. The invention has good emulsifying and viscosity-reducing effects, the emulsified crude oil can be automatically demulsified to reach a dehydration rate over 95 percent, and the viscosity reducer has little consumption and low cost by adopting low-price materials.

Memory-mapping support for reducer hyperobjects

Abstract: Reducer hyperobjects (reducers) provide a linguistic abstraction for dynamic multithreading that allows different branches of a parallel program to maintain coordinated local views of the same nonlocal variable. In this paper, we investigate how thread-local memory mapping (TLMM) can be used to improve the performance of reducers. Existing concurrency platforms that support reducer hyperobjects, such as Intel Cilk Plus and Cilk++, take a hypermap approach in which a hash table is used to map reducer objects to their local views. The overhead of the hash table is costly --- roughly 12x overhead compared to a normal L1-cache memory access on an AMD Opteron 8354. We replaced the Intel Cilk Plus runtime system with our own Cilk-M runtime system which uses TLMM to implement a reducer mechanism that supports a reducer lookup using only two memory accesses and a predictable branch, which is roughly a 3x overhead compared to an ordinary L1-cache memory access. An empirical evaluation shows that the Cilk-M memory-mapping approach is close to 4x faster than the Cilk Plus hypermap approach. Furthermore, the memory-mapping approach admits better locality than the hypermap approach during parallel execution, which allows an application using reducers to scale better.

Electric power steering device

Abstract: PROBLEM TO BE SOLVED: To provide an electric power steering device that reduces operation noise by preventing vibrations from being transmitted to a reducer even when the vibrations of a motor are generated due to expanding/contracting motions of a stator of the motor.SOLUTION: The motor 18 is fixed to a reducer housing 33 when a motor flange 30 is fastened to a plurality of screw holes formed in the upper part of the reducer housing 33 with attachment bolts 32. A plurality of semispherical motor flange projections 31 projecting at the motor flange 30 are disposed in a gap between the motor flange 30 and the facing reducer housing 33, and are disposed so as to overlap the reducer housing 33 while the projections are in point-contact with the circumference of the reducer housing 33, using a motor shaft 29 as a center line.

Small electric vehicle central driver

Abstract: The invention discloses an electromechanical integral middle-arranged motor driver of a small scaled electrocar, including a motor, a controller, a sensor, a gear reducer, a one-way clutch, a chain tensioner and a shell. A fixing frame is mounted a middle axis position of a lower part of the small scaled electrocar. The middle-arranged motor driver is mounted on the fixing frame through a tensioning piece. The motor is a DC rare earth permanent magnet intermediate speed interior rotor motor. A motor shaft is in parallel to a big gear shaft and the middle axis. The controller is built-in and mounted in the driver shell or on the shell. The sensor is an acceleration sensor. The gear reducer is a single-stage reducer lubricated by lubricating grease or doped with small amount of lubricating oil. The shell is made of a light alloy or engineering plastics with high-impact and high size stability and is provided with a sealing rubber plug for leading out a wire harness. The periphery of the shell part is provided with a groove and sealed by a silicon rubber to form a full-sealing waterproof structure. The driver has a ingenious and compact structure, strong motive power, good performance and high reliability.