56results about How to "Consistent stress" patented technology

An injection molding apparatus having a manifold and several manifold melt channels communicating with several hot runner nozzles includes a melt redistribution element. The melt redistribution element is placed at specific locations along the melt channels to balance the uneven shear stress profile accumulated during the flow of a melt along the manifold channels. The melt redistribution element has an unobstructed central melt bore having at its inlet a narrowing tapered channel portion. The melt redistribution element also includes a helical melt pathway portion that surrounds the central melt bore. The incoming melt is first subjected to a pressure increase by the tapered portion that causes the melt to flow at a higher velocity through the central melt bore. The outer portion of the melt is forced to flow along the helical path and thus it changes direction multiple times and partially mixes with the melt flowing through the central melt bore. Accordingly, at the outlet of the melt redistribution element the shear stress profile is more evenly distributed than at the inlet of the redistribution element.

The invention discloses a connecting structure used for a suspend-dome structure. The suspend-dome structure is a structure formed by connecting an upper chord single-layer spherical reticulated shell, an oblique cable and hoop cables through a vertical compression rod. In the connecting structure, the oblique cable, the hoop cables and the vertical compression rod are connected with each other through a welded hollow spherical joint. The welded hollow spherical joint forms three holes in the horizontal hoop cable direction, wherein two holes allow one hoop cable to penetrate the welded hollow spherical joint and be anchored through a cast anchor, the other hole allows a washer inside the welded hollow spherical joint to be anchored with a screw cap to form a connecting cable head, and the connecting cable head is connected with a threaded sleeve through the other hoop cable; the welded hollow spherical joint forms the other hole in the oblique cable direction, the washer used inside the welded hollow spherical joint is anchored with the screw cap to form the other connecting cable head, and the connecting cable head is connected with the hoop cables through the threaded sleeve. After the connecting structure is adopted, the construction of the suspend-dome structure is very convenient, the cable force can be adjusted times and again, and the disadvantage that the cable force in the prior suspend-dome structure engineering is difficult to be consistent with the theoretical value can be overcome.

The invention relates to a method for reducing the misalignment voltage of a hall integrated circuit. The method is as follows: a hall unit array is positioned on the central part of a chip and other circuit devices which serve hall units are arranged on the circumference of the hall unit array and in parallel connection with the hall units; the circumference of each hall unit is enclosed by an isolation belt and an epitaxial layer which are formed by heavy doping; involved devices comprise a semiconductor P type substrate and a light-dope semiconductor N type epitaxial layer which is grown on the semiconductor P type substrate; a heavy-dope semiconductor P type isolation belt is also arranged on the semiconductor N type epitaxial layer; and the isolation belt divides the semiconductor N type epitaxial layer into at least three isolated hall units which are centrally symmetrically arranged arrays. The method can make affection of stress, pressure and so on of the chip edge on the hall devices be consistent, make affection of other devices on the circumference of the hall units on the misalignment voltage of the hall units smaller, make affection of deviation of the manufacturing technique on the hall units be consistent, and have better matching property.

The invention discloses a method for building a conceptual design model of a white automobile body. The method comprises the following steps: building conceptual models of corresponding structures of an upper automobile body by using a beam unit sequence, a plate shell unit and a rigid rod unit; building conceptual models of corresponding structures of lower automobile body by using the beam unit sequence, the plate shell unit and the rigid rod unit; building a conceptual model of a joint part by using a rigid rod unit and beam unit sequence connection mixing structure; building a conceptual model of a front coaming assembly by using topology optimization and topography optimization. According to the conceptual model which is built by the method for building the conceptual design model of the white automobile body, the corresponding rigidity and the corresponding stress distribution of the white automobile body can be more precisely simulated, and meanwhile, cross section and truncation databases are more easily constructed, and responses of the while automobile body to subsequent modifications on a cross section, a typical truncation, a model and the like can be reflected in more details.

A method for designing a crack propagation characteristic simulator of a central hole of a centrifugal impeller include such steps as obtaining a geometric model of that centrifugal impeller, measurea diameter and a thickness of the central hole structure, measuring the diameter and the thickness of the centrifugal impeller, measuring the diameter and the thickness of the centrifugal impeller, measuring the diameter and the thickness of the centrifugal impeller, measuring the diameter and the thickness of the centrifugal impeller, (2) obtaining the working conditions of the centrifugal impeller and the material performance parameters under the working conditions, including load, temperature, elastic modulus, yield strength and so on; (3) Establishing the finite element static analysis model of centrifugal impeller, calculating and obtaining the maximum circumferential stress point at the center hole of centrifugal impeller, and obtaining the circumferential stress value and the circumferential stress gradient of the point; (4) Based on the basic shape of the plate simulator with symmetrical circular notch, the central hole structure simulator is designed, so that the maximum stress along the direction of tensile loading on the stress concentration point of the simulator is equal to the maximum circumferential stress in the actual central hole structure, and the stress gradientis ensured to be the same; (5) Calculate the stress intensity factor of the simulator and determine the thickness of the simulator.

The invention relates to a tension control device of wrapping manufacturing multi-strand coil spring steel wire which includes a steel wire tension adjusting and signal radiation part, a steel wire tension signal receiving displaying part; the steel wire tension adjusting and signal radiation part includes an inner layer steel wire rotary rack and an outside layer rotary rack, the inner/outside layer steel wire rotary racks are equipped with an individual rack; the individual rack inside is equipped with a force sensor, the steel wire is educed from a third directive wheel through the force sensor; the force sensor on each individual rack of the inner/outside layer steel wire connects with a tension measuring plate circuit and a radio sending circuit through lead; the steel wire tension signal receiving displaying part includes a radio receiving plate, a computer and a display. The device has advantages that each steel wire of wrapped spring has basic coincident tension by controlling each steel wire tension of multi-strand coil spring, spring working is reliable and working life is prolonged.

The invention relates to an assembly type prestress honeycombed web composite beam. The assembly type prestress honeycombed web composite beam is assembled by two prestress corrugated web steel channel composite beam bodies through bolts. Each prestress corrugated web steel channel composite beam body is composed of a reinforced concrete wing plate, a profiled steel plate, an upper flange, one web, a lower flange, a prestressed cable, an anchor and a beam end plate. The fracture surface of each prestress corrugated steel channel composite beam body is composed of the reinforced concrete wing plate, the profiled steel plate, the upper flange, the lower flange and the webs. The fracture surface of each web is in even or uneven wave shape repeated periodically, and each prestressed cable penetrates through the webs and the beam end plate and is tensioned and then fixed to the beam end plate through the anchor. The plane of each web is arranged to be honeycombed to obtain the optimum effect in overall bearing capacity of the component, and the assembly type prestress honeycombed web composite beam is an innovation-type assembly type prestress section steel composite beam which is suitable for an assembly type steel structural system and particularly suitable for a large-span multi-story or high-rise assembly type steel structural system. Compared with a traditional assembly type beam, the assembly type prestress honeycombed web composite beam has the advantages of being light in self weight, high in bearing capacity, large in span and the like.

The invention relates to a method for multi-scale detection of a composite material liquid storage container. The steps are: obtaining the mesoscopic geometric shape of the material through optical equipment, using image processing technology to extract the mesoscopic geometric parameters of the material; The three-dimensional reconstruction method is used to establish the material unit cell, and the comprehensive performance parameters of the material are predicted by loading the periodic boundary conditions; the composite material liquid storage container model is established by using the material comprehensive performance parameters and the design size of the liquid storage container. The fluid-solid coupling is realized in the form of a function, and the safety detection of the collision impact of the liquid storage container is carried out with the numerical reproduction of the airdrop test; for the damaged area of ​​the liquid storage container, the microscopic damage behavior of the material is detected through the unit cell model, and the macroscopic damage behavior of the composite material is obtained. performance parameters. The invention solves the performance detection problem of the composite material liquid storage container, greatly shortens the equipment development time, and reduces the randomness of experiments and capital investment.

The invention provides an integrated water tank type crystallizer used for casting 7 series extra super duralumin alloy, relating to a crystallizer. The invention solves the problem that cast ingot produces cracks caused by stress concentration as the existing crystallizer is not even in water-cooling distribution. The cross section contour of the flat through hole is composed of two arc sections and two straight line sections, each arc section is formed by butt joint of two arcs in different diameters; the lower end face of all the side walls of crystallizer tank body is opened with an annular groove, the lower end face of the annular water feeding hole wall body between the annular groove and the flat through hole is opened with a plurality of osculums in uniform distribution, the lower end of each osculum is inclined toward the central axis of the flat through hole; and four clapboards are respectively arranged at the two ends of the annular groove and divide the annular groove into four regions. The crystallizer of the invention adopts four-section design and different diameters of osculums to control water flow, so that cooling of cast ingot is even, temperature is ensured to be consistent with stress field distribution, and cast ingot crack tendency is greatly reduced.

A fixing device for acoustic emission test sensors for rock damage testing, the device including: a fixing frame, installation bases operating to accommodate the acoustic emission test sensors, respectively, fixing assemblies operating to fix the acoustic emission test sensors in the installation bases, and installation mechanisms operating to install the installation bases on the fixing frame. The fixing frame is an integrated loop-shaped frame. Each of the installation bases is a cylinder structure which includes: a cavity corresponding to an outer edge of each of the acoustic emission test sensors, and a wall including a gap for leading out wires of each sensor. The installation mechanisms are adapted to automatically and axially adjust positions of the installation bases. The installation mechanisms are four in number. The four installation mechanisms are disposed on a same section plane of the fixing frame and every two installation mechanisms are oppositely disposed.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a fast charging type lithium ion battery pole piece. The method comprises thefollowing steps of coating slurry with active substances on the two surfaces of a current collector to obtain the pole piece with a first active substance layer and a second active substance layer which are symmetrically arranged; rolling the two surfaces of the pole piece; and cleaning the redundant first active material layer to obtain the fast charging type lithium ion battery pole piece witha double-sided coating area and a single-sided coating area. According to the preparation method of the fast charging type lithium ion battery pole piece, the rolling thickness of the single-side coating area of the pole piece after rolling is consistent with that of the double-side coating area, and the compression degree of active substance layers at the two sides of the pole piece can be effectively ensured to be consistent during rolling; and the failure problems of powder falling, lithium precipitation and the like of the single-side coating area in the subsequent charging and dischargingprocess due to different thicknesses of the single-side coating area and the double-side coating area of the pole piece and different compression degrees when the pole piece is rolled to pass througha roll gap in the traditional process, are effectively avoided.

The invention discloses a cross beam film stress concentration micro-pressure sensor chip and a preparation method thereof. The sensor chip comprises a pressure-bearing film, a silicon substrate, a piezoresistor strip, a metal lead, an anti-overload glass substrate and the like. According to the specific structure, the back face of a silicon substrate is etched to form a pressure-bearing film and a peninsular and island structure, and four diamond-shaped areas are etched on the front face of the silicon substrate to form a cross beam. Stress concentration areas are formed on the front face of the chip corresponding to gaps between islands adjacent to a chip back cavity and between the islands and peninsula, the four piezoresistor strips are arranged on the stress concentration areas, and the piezoresistor strips are connected to form a Wheatstone bridge through heavily-doped ohmic contact areas, metal leads and metal bonding pads. The existence of the cross beam can further improve the stress concentration effect at the piezoresistor strip.

The invention discloses a method for improving the precision of a micro-deformation loading device. A test piece made of a constant-elasticity alloy material is divided into a central displacement area, a middle ring elastic deformation area and a peripheral fastening area, the test piece is designed and assembled in a split manner to form a test piece assembly so as to eliminate the influence ofthe deformation caused by machining of a disc-shaped thin-wall area of the test piece and the deformation of a cutting residual stress deformation area generated in the machining process, and displacement errors caused by threaded connection gaps or contact force deformation at the joint of a high-precision driving device and the test piece are reduced through the connection mode of an outer circle at the output interface of a radial enclasping driving device and an outer circle of the cylindrical extending end of the test piece. According to the method and the device, the deformation hysteresis caused by internal stress after the elastic deformation area of the test piece is deformed is reduced, and the displacement errors caused by connection contact force deformation or connection clearance between the driving device and the test piece is reduced, so that the uncertainty of the micro-deformation loading device can be greatly reduced.

A wet drawing method for manufacturing the aluminium clad steel wire used for electric engineering is characterized by that the semi-finished aluminium clad steel wire is drawn through multi-pass drawing die by drawing machine while the lubricating oil is applied.

The invention discloses a closing method for a kilometer-level hybrid beam cable-stayed bridge. The closing method comprises the steps that the pushing direction of main beams on the two sides of thekilometer-level hybrid beam cable-stayed bridge is determined according to the single-side displacement amount; enabling the two-side line shapes of the closure gap to accord with the two-side line shapes of the closure gap in the reference model; after the actual length of the closure opening is equal to the reference length of the closure opening, the closure opening is locked, and pushing is removed; after the closure section beam is hoisted, the unstressed length of the first set inhaul cable is adjusted to a reference value, and the length of the closure section beam is the reference length of a closure opening; calculating a main span steel structure linear relative error, a bridge axis relative error, a tower deviation relative error and a cable force error after the bridge is formed; whether the errors meet corresponding set errors or not is judged, if yes, closure is completed, If not, adjustment is conducted till all the errors meet the corresponding set errors; the relativeerror of the main span steel structure line shape is set to be L/4000, the relative error of the bridge axis is set to be L/40000, the relative error of tower deviation is set to be L/10000, and L isthe main span length.

A wet drawing method of Al-enclosing steel wires for electrotechnics in the invention relates to a method for drawing the Al-enclosing steel wires by using a lubricant as a lubricating medium, wherein the lubricant is prepared by lubricating grease or an emulsion and other mediums.

The invention discloses an energy-saving doorbell based on the piezoelectric principle, and the doorbell comprises a button device and a loudspeaker device of the doorbell. The button device consists of two piezoelectric pieces with the consistent polarization direction, and a flexible insulating material layer which is used for separating the two piezoelectric pieces. The two surfaces, backing on to each other, of the two piezoelectric pieces are connected through a first wire, and the opposite surfaces of the two piezoelectric pieces are connected through a second wire. The first and second wires are respectively connected with a current limiting resistor, an inductor and a loudspeaker device. The doorbell employs the piezoelectric effect of a piezoelectric material, does not need a power supply, and saves the energy. Moreover, the piezoelectric material is stable in performance, and is long in service life, is low in cost, and can be widely used in life.

The invention discloses a slicer for door frame board quick forming. The slicer for door frame board quick forming comprises a rack, a working platform, a transverse cutting tool, a lengthways cuttingtool and a push device, wherein the transverse cutting tool is used for transversely cutting the side part of a short material, the lengthways cutting tool is installed on the working platform and used for lengthways cutting the same side part of the short material, and the push device is installed on the rack and used for pushing the short material to move forwards on the working platform. The slicer for door frame board quick forming is ideal and compact in structural design, can achieve the very good quality benefit and economic benefit while the pollution caused by glue to the environmentis reduced; it is adopted that the short material is transversely cut by the transverse cutting tool and is lengthways cut by the lengthways cutting tool in sequence in the length direction of the short material, and then a door frame short material with the integrated large border and small border can be formed by removing excess materials; according to the running form cutting mode, operation is carried out in one step, the traditional mode of keeping to the edge, and the traditional mode of splicing a large border and a small border are changed, it is guaranteed that the internal stress ofthe door frame short material formed by the large border and the small border keeps consistent, a door frame board made through finger joint later is consistent in internal stress, and it is guaranteed that the forward lateral bending of a product is not out of limits, so that the straightness is guaranteed.

The invention discloses a multi-level matrix converter suitable for a high-power density occasion and a clamp capacitor voltage control method thereof. The converter can be suitable for the direct AC-AC conversion occasion with high power density and reliability requirement. The converter topology structure can realize the output of multi-level, and the withstand voltage of the single-device is lower than the traditional two-level topology, the output end harmonic wave can be effectively reduced, and the voltage step is smaller; and the proportion of the clamp circuit voltages at different levels can be 1: 2: 3: ...N-1. Compared with the prior art, all devices in the converter are consistent in stress, maximum withstand voltages born by various bidirectional switches are consistent, the modularity is strong, the device model selection and maintenance are convenient, and the later cost is effectively reduced; furthermore, the capacitor balancing region is increased, the capacitor voltage controllable range is greatly increased, the capacitor can be completely controlled at a low-modulation region (low in voltage utilization efficiency), and the capacitance balancing computation complexity is reduced.

A fixing device for acoustic emission test sensors for rock damage testing, the device including: a fixing frame; installation bases operating to accommodate the acoustic emission test sensors, respectively; fixing assemblies operating to fix the acoustic emission test sensors in the installation bases; and installation mechanisms operating to arrange the installation bases on the fixing frame. The fixing frame is an assembled loop-shaped frame and includes between two and four frame members and corresponding fixing structures; and the frame members are assembled into an integrated loop-shaped frame by the fixing structures. Each of the installation bases is a cylinder structure. The cylinder structure includes: a cavity corresponding to an outer edge of each of the acoustic emission test sensors, and a wall including a gap for leading out wires of each sensor.