217results about How to "Avoid fatigue fracture" patented technology

The present invention provides a pneumatic tire that inhibits any fatigue rupture at an edge portion of a circumferential-direction reinforcing belt layer and also inhibits any separation at an edge portion of crossed belt layers. In the pneumatic tire, at least two crossed belt layers are disposed on the outer circumferential side of a carcass layer in a tread portion. At least one circumferential-direction reinforcing belt layer with a width smaller than those of the crossed belt layers is disposed between the crossed belt layers. Moreover, a stress relaxation layer of a rubber composition having a fixed thickness is disposed between the crossed belt layers while lying adjacent to an edge portion of and outside, in the width directions of, the circumferential-direction reinforcing belt layer.

The invention provides a combination method and apparatus for laser shock processing of an engine blade. The invention is characterized in that a blade shock strengthening area is divided into a marginal region, a transition region I and a transition region II which are increasingly far away from the edge of the blade successively, power density of laser used in the marginal region, the transition region I and the transition region II gradually decreases while light spots in the regions gradually increase, so residual compressive stress smoothly transits from a blade marginal surface layer to an unprocessed area, thereby improving the fatigue life of the blade.

A turbo compressor includes an impeller which is rotationally driven, and a flow path in which the impeller is provided, and through which gas flows, the turbo compressor sucking and compressing the gas in the flow path. The turbo compressor further includes a fluid discharge device which discharges a liquid in the flow path on the upstream side of the impeller.

The invention discloses a floating type brake pad. The floating type brake pad comprises a back plate, a plurality of friction blocks, disc springs and clamping springs, wherein the friction blocks are arranged on the back plate, the disc springs are arranged between the friction blocks and the back plate, and the friction blocks are connected to the first back plate in a floating mode through the clamping springs. Positioning grooves are formed in the back plate, and the disc springs are arranged inside the positioning grooves. The back plate is divided into a plurality of concentric circular rings by using the circle center of a brake disc matched with the brake pad as the circle center. The circular rings are equal in radial length. The friction area of the friction block inside each circular ring is not larger than 15% of the standard average friction area compared with the standard average friction area. According to the floating type brake pad, the problem of fatigue cracks caused by instantaneous stress concentration during braking of existing disc springs is solved, meanwhile, gaps between the back plate and the friction blocks are reduced, oscillation of the friction blocks is small, meanwhile, the problem of eccentric abrasion of the friction blocks is avoided, and the brake stability is greatly improved.

The invention relates to a permanent magnet zero-position retaining mechanism of a two-dimensional digital servo valve. The mechanism comprises an upper balance wheel, an oscillating axle and a lower balance wheel, wherein the upper balance wheel is connected with a motor shaft; the lower balance wheel is connected with a valve plug; the middle part of the upper balance wheel is provided with a mounting hole for the motor shaft to penetrate; the lower end of the upper balance wheel is provided with a groove opening; the groove opening is provided with a oscillating axle internally; one end ofthe oscillating axle extends into a limiting hole of a motor mounting plate; the upper part of the lower balance wheel can be rotatably sleeved on the oscillating axle; the lower part of the lower balance wheel is provided with a mounting hole for a valve plug to penetrate; a left retainer and a right retainer are installed on the motor mounting plate, and are positioned at the left side and the right side of the lower end of the lower balance wheel; a groove of the left retainer is provided with a first permanent magnet internally; a groove of the right retainer is provided with a second permanent magnet; grooves at the left side and the right side of the lower balance wheel are respectively provided with a third permanent magnet and a fourth permanent magnet internally; the first permanent magnet and the second permanent magnet are arranged oppositely; and the second permanent magnet and the fourth permanent magnet are arranged oppositely. The mechanism provided by the invention hasthe advantages of good safety and is reliable in working.

The invention discloses a hot air type penetration reverse flow fluidization drying machine with tail heat utilization and inertial dust collecting functions. The upper portion of a drying tower is connected with an induced draft fan. The induced draft fan is connected with an efficient cyclone dedusting tail heat recovery device in a tangential manner through an inertial dust collecting device and then performs evacuation, wherein the efficient cyclone dedusting tail heat recovery device is formed by overlaying a tube bank type heat exchanger and a cyclone dust collector. The air inlet end of a shell pass of the tube bank type heat exchanger is communicated with atmosphere, and the air outlet end is connected with the lower portion of the drying tower through an air blower and a steam fin heater; and blades of an impeller of the induced draft fan are arranged to be in a radiation shape and are in radial and central symmetry with respect to an impeller shaft, the dust can be cleared up in time through centrifugal force, and safety accidents are avoided. By the adoption of the hot air type penetration reverse flow fluidization drying machine, the drying efficiency is improved, and energy saving and emission reduction are achieved; and more importantly, the disassembly and assembly technology of the induced draft fan is improved greatly, so that pressure applied to the shaft shoulder end face of a screw by components similar to a nut component can be eliminated simply when the induced draft fan is disassembled, and the problem that the induced draft fan is locked continuously and automatically and cannot be disassembled easily under the load action due to threaded assembly is solved effectively; and the hot air type penetration reverse flow fluidization drying machine is especially suitable for convenient and fast disassembly of a large-scale fan which is locked in a threaded manner, and the effect is particularly obvious.

A form rolling method for an involute gear, which includes a work piece (10) including a cylindrical outer peripheral surface having a predetermined radius, and a round die (20) with an Involute tooth profile including an addendum pitch corresponding to a pitch defined by dividing a length of an outer circumference of the work piece (10) by number of teeth of the involute gear. The round die (20) is pressed to the work piece(10) while rotating when form rolling the involuete gear.

The invention discloses a pilot electromagnetic valve. The pilot electromagnetic valve comprises a valve body (1), an electromagnet outer shell (2), a valve rod (3), a main valve (4), an auxiliary valve (5), a yoke (6), a fixed iron core (8), a movable iron core (9) and an electromagnetic coil (10). The main valve (4) is in sliding fit with the interior of the valve body (1) to open or close a flow inlet channel (11) and a flow outlet channel (12), the fixed iron core (8) is connected with the movable iron core (9) through a magnetic core tube, and the magnetic core tube is composed of a first guide sleeve (15) and a second guide sleeve (16); the movable iron core (9) is in sliding fit with the interior of the first guide sleeve (15) and the interior of the second guide sleeve (16); a safety assembly capable of discharging leakage media is arranged on the side wall of the electromagnet outer shell (2) provided with the electromagnetic coil (10); a cavity (18) with which the auxiliary valve (5) is in sliding fit is formed in the main valve (4), and the axial section of the main valve (4) is in a U shape. By means of the pilot electromagnetic valve, the sealing performance is good, the electromagnetic coil can be prevented from being exploded, and the main valve is sensitive in response.

The invention discloses a linear vibration motor, and relates to the technical field of miniature motors. The linear vibration motor comprises a shell, a stator, a vibrator and elastic support elements, wherein the elastic support elements are located at two ends of the vibrator and provide elastic restoring force; each elastic support element comprises two elastic arms; connection parts are arranged at two ends of the same side of each elastic arm respectively; two connection parts at one end of every two elastic arms are combined with each other; two elastic arms extend towards the corresponding directions of respective connection parts to form a transverse crossover structure in the transverse direction respectively; and two connection parts at the other ends of every two elastic arms are combined with the vibration and the shell respectively. A vibration space, occupied by the elastic support elements in the linear vibration motor, of the vibrator is relatively small; and an enough space is left for increase of the weight and the volume of a vibrator mass block, so that the resonant frequency of the vibration motor can be effectively reduced; the low-frequency performance of the vibration motor is improved; and the overall performance of the vibration motor is relatively high.

The invention relates to a device and method for monitoring the tension of an underwater umbilical cable in an ocean device. The device comprises a connecting device, a clamp, a steel cable hanging net and a tension monitoring sensor, wherein the connecting device, the upper end and the lower end of the steel cable hanging net, and the tension monitoring sensor are located on the same plumb line, the connecting device, the clamp and the steel cable hanging net are used for being connected with and fixing the umbilical cable, the tension monitoring sensor is arranged below the connecting device and connected to an instrument bin of a submersible device through a signal line and a watertight connector, a computer in the instrument bin is communicated with a water surface computer through an RS-422 communication interface, and voltage signals of the tension of the umbilical cable are transmitted to the computer in the instrument bin by the tension monitoring sensor and then are transmitted to the water surface computer through the umbilical cable. By means of the method and device, the tension of the underwater umbilical cable can be monitored and is prevented from exceeding a threshold value, necessary information can be provided for the operation of operation personnel in time so that the fatigue cracks of the umbilical cable and the operation accidents of the submersible device can be avoided, and the operation safety of a body of the submersible device can be ensured.

A tire (2) according to the present invention includes a tread (4), a pair of beads (8), and a carcass (10) having a radial structure. The carcass (10) has a first ply (32) and a second ply (34). The first ply (32) has a first cord. The first cord is formed by twisting three yarns. The yarn is constituted by an aramid fiber. A fineness of the yarn is equal to or higher than 800 dtex and is equal to or lower than 1100 dtex. The second ply (34) has a second cord. The second cord is formed by twisting three yarns. The yarn is constituted by the aramid fiber. A fineness of the yarn is equal to or higher than 800 dtex and is equal to or lower than 1100 dtex.

The invention relates to a lightening protection device for a wind generating set blade. A hub is provided with a fixed lightening receiving contact device which is contacted with a lightening protection wiring board; one end of the lightening protection wiring board is fixed to the root of the blade; the fixed lightening receiving contact device comprises a lightening protection carbon brush support connected with the hub; a carbon brush is fixed on the lightening protection carbon brush support, and is connected with an electrode; and the carbon brush and the electrode are directly contacted with the lightening protection wiring board. The fixed lightening receiving contact device is arranged in the hub, the fixed lightening protection wiring board is arranged on the root of the blade, the contact surfaces of the two lightening protection parts slide mutually when the hub and the blade move relatively, and the lightening current in the blade is smoothly led out. A lightening protection lead is prevented from torsion and fatigue fracture, the set can be effectively prevented from suffering lightening due to fracture of a lightening protection wire, the safety and the stability of the set are improved, the maintenance cost of the lightening parts of the set blade is reduced, and the operating efficiency of the set is improved.

The invention discloses an exhaust pipe used for an air-conditioner compressor, which is connected between the compressor and a valve. The exhaust pipe comprises a front section vertical to an exhaust port of the compressor and a rear section connected to the valve, wherein, the front section and the rear section are connected through a connecting section which at least comprises an arc section. The improved exhaust pipe can not only effectively reduce the impact of coolant in the pipe on the pipeline as well as the vibration and noise of the pipeline, but also can reduce the stress value of the pipeline, improve the stress distribution and avoid the break of the exhaust pipe due to fatigue. Meanwhile, the exhaust pipe has good comprehensive performance in the aspects of improving the energy-efficiency ratio of the air-conditioner and the reliability of dropping transport, etc.

The invention relates to a method and equipment for evaluating the technological property of bolt installation, and the method comprises the steps: determining the fastening sequence of bolts; testing the total pulling force of bolts in an operation process under the condition of different loads; obtaining a real-time stress amplitude value; making a conclusion that an end face of a connected part is cracked when the real-time stress amplitude value is greater than a standard stress amplitude value; and determining the fastening sequence of new bolts till the fastening sequence of the current bolt is judged to be the optimal bolt fastening sequence. The equipment comprises a signal input end module, a signal collection and processing module, and a man-machine interaction module, wherein the signal input end module comprises a strain signal input end, a standard analog input end, and a power circuit. The signal collection and processing module comprises a processing chip. The man-machine interaction module comprises a processor, a communication interface, an operation module, and a display module. The method and equipment can test the bolts, propose a new installation technology, and facilitate the maintenance of the bolts.

The present invention provides a flexible shaft coupling, comprising a tubular hub made of a rigid material, wherein the hub is provided with a slit extending substantially circumferentially for providing flexibility to the hub, the hub having an axial bore so that a rotational force of a drive rotation shaft received in the axial bore at one end of the hub can be transmitted to a driven rotation shaft attached to the other end of the hub, wherein circumferential ends of a part of the hub adjoining the slit are each provided with a convex shape having an arcuately receding surface at least at an outer peripheral portion.

The invention discloses an elastic torque sensor. The elastic torque sensor comprises an outer sensor ring, multiple elastic bodies, an inner sensor ring, inner ring strain gauges, connection beams, a connection beam strain gauge and a center base, wherein the multiple elastic bodies are uniformly distributed circumferentially, two ends of the multiple elastic bodies are respectively connected with the outer sensor ring and the inner sensor ring, each elastic body comprises two symmetric elastic body units, the connection beams are uniformly arranged between the inner sensor ring and the center base, surfaces of the connection beams are bonded with the connection beam strain gauge, and upper and lower surfaces of the inner sensor ring are respectively bonded with the inner ring strain gauges uniformly. According to the elastic torque sensor, the peripheral elastic bodies have filtering effects on impact, so short-time impact exerted on the inner torque sensor can be greatly reduced, compared with a traditional torque sensor manufactured by the same material, the elastic torque sensor provided by the invention has remarkable small volume and light weight, moreover, the strain gauge is employed, so use cost can be greatly reduced compared with a commercial torque sensor.

A turbine support structure supports a turbine casing and is configured to be movable when the turbine casing is thermally deformed while a gas turbine is operated, thus preventing a fatigue fracture of the turbine casing from occurring. The turbine support structure includes a pair of supports, each having an upper and lower end, for supporting respective opposite side surfaces of the turbine casing at the upper end of either support; and a movable unit installed at the lower end of each support and configured to movably support the lower end of the support. The movable unit is spaced outwardly from the corresponding opposite side surface of the turbine casing, so that the corresponding support inclines toward the turbine casing and is rotatable. The lower end of each support is rotatably coupled to the corresponding movable unit so that the support is rotatable toward an axis of the turbine casing.

The invention relates to the technical field of nuclear power stations and in particular relates to a special plane slit vortex type desalter filtering device for a nuclear power station. The plane slit vortex type desalter filtering device consists of an adapter pipe, a water guide port, a sealing tape, a filtering barrel, a sealing ring, a baffle, a sealing side strip, a supporting barrel, a water outlet, a core column, a water guide sleeve, a fastening nut and a plurality of limiting sleeve discs, wherein a fan-shaped filter disc is arranged on the outer side face of each upper positioning ring; an elongated slit is formed in each filter disc; an elastic clamp which is integrated with the corresponding filter disc is arranged on the upper surface of the arc edge of the corresponding filter disc and consists of a cubic block and a rectangular strip; and the cubic block and the upper surface of the corresponding filter disc are integrated. Compared with the prior art, the special plane slit vortex type desalter filtering device has a higher filtering efficiency and mounting efficiency and is good in durability.

The invention relates to an adjustable-bending tissue removal instrument for medical use. The tissue removal instrument comprises a tissue removal head, an adjustable-bending unit, a rotating shaft and an adjusting and control straight pipe, wherein the adjustable-bending unit comprises a linear section and a fixed bending part which is made from an elastic material; the linear section is fixedly connected to an adjusting and control handle; the far end of the rotating shaft is connected to the tissue removal head and the near end is provided with a connecting piece; the part of the rotating shaft, located on the fixed bending part, is composed of multiple sections of flexible shafts, and every adjacent two sections of the flexible shafts are connected by virtue of a stress releaser; each of the stress releasers comprises a plurality of connecting units, and the connecting units at two ends of the stress releaser are connected to nearby flexible shafts; movable connection, which is capable of achieving axis transmission rotating motion along the connecting units, is arranged between the adjacent two connecting units; the adjusting and control straight pipe is sleeved outside the adjustable-bending unit; and by operating the adjusting and control handle, the adjusting and control straight pipe is controlled to move in an axial direction. The rotating shaft of the invention is capable of transmitting torque by virtue of the plurality of the stress releasers, so that the alternating stress from bending is eliminated, fatigue breakage in the flexible shafts is avoided and the reliability of the instrument is improved.

The present invention discloses a method and a device for welding the sampling tube penetrating into the medium container. According to the method, the tube seat base and the tube seat roof are respectively processed with a welding bevel for welding the welding bevel at the base of the welding seat with the medium container. After the welding of the tube seat and the medium container, a rod measuring hole which penetrates the tube seat and the medium container is processed from the tube seat roof. The basal diameter Dd of the welding bevel of the tube seat base is smaller than the diameter Dz of the sampling hole. The sampling tube traverses the tube seat and the medium container and extends into the medium container. The sampling tube is welded with the welding bevel of the pipe seat roof. The sampling tube of the invention is easy welded, and the quality of the welding line is easy controlled. The external surface of the solder is an inclined surface or a cambered surface for reducing the stress at the welding joint. After welding, the processing of the through hole of the installed sampling tube is completed in one time so that the tube seat and the hole on the medium container satisfy the concentricity requirement.

A sound absorption element for means of transport, in particular for aircraft, comprising at least one sound absorption panel arranged on a base panel with the base panel comprising a multitude of recesses, in particular a hole grid or the like, for the transmission of sound.According to the invention, the sound absorption panels are each framed by a frame, wherein on the at least one frame at least in some sections a transition profile, in particular to prevent fatigue fractures due to stepwise changes of rigidity between the at least one frame and the base panel is arranged.Due to the base panel comprising a multitude of recesses, in particular comprising a hole grid, in connection with the sound absorption panels an air-permeable sound absorption element can be achieved.

The invention discloses a fracture-resistance copper and aluminum transition plate which includes a copper end plate (1). The copper end plate (1) is fixedly connected with an aluminum end plate (2). The transition plate is characterized in that the connection position of copper end plate (1) and the aluminum end plate (2) is provided with an anticorrosion pipe (3) which employs a heat shrink pipe or a chilling shrink pipe. Fixing connection holes (4) are arranged in both of the copper end plate (1) and the aluminum end plate (2). A bar-shaped aluminum plate (5) is connected with the copper end plate (1) and the aluminum plate (2) by bolts (6) through the fixing connection holes (4). An insulating layer (7) is arranged between the bar-shaped aluminum plate (5) and the copper end plate (1). The thickness of the insulating layer (7) is identical with the thickness of the anticorrosion pipe (3). The fracture-resistance copper and aluminum transition plate is simple and effective in structure, capable of preventing electrochemical corrosion and preventing fatigue fracture at the joint position of the copper and aluminum transition plate and long in service life.

The invention discloses a network switch capable of preventing a network cable from loosening. The network switch comprises a switch body, wherein a chute is formed inside the switch body; vertical plates are fixedly connected to two sides of inner walls of the chute; a movable block is connected between opposite sides of the two vertical plates in a sliding manner, and one side of the movable block is fixedly connected with a moving rod; one end of the moving rod penetrates through the switch body and extends to the outer part of the switch body. The invention relates to the technical field of network switches. According to the network switch capable of preventing the network cable from loosening, stoppers are fixedly connected to one ends of two slide bars, and the network cable is inserted into a mesh hole to be fixed, so that the stability of the network cable can be improved. During use, the network cable is prevented from dropping due to gentle touch, and the stability of the network is improved. Due to mutual fixation between a first sliding plate and a second sliding plate, the stability of the network cable can be improved by virtue of multiple fixation, the contact property of the network cable is high, and normal operation of the network is ensured.

The invention relates to an elastic spine fixing system and pressure-adjustable fixing rods for clinical application of a department of orthopedics. The elastic spine fixing system comprises any two of the pressure-adjustable fixing rods, two connecting cross rods (50), four fixed hooks (51) and a plurality of pedicle screws (46); each of the adjustable pressure fixing rods comprises an adjusting rod, a sliding fit thread sleeve, an elastic device and a fixed rod. The elastic spine fixing system and the pressure-adjustable fixing rods provided by the invention have the advantages that the pressure is adjustable, fixing is firm, the operation is simple, the adjustment is easy, stress shielding is effectively prevented, osteoporosis is avoided, and fracture healing is accelerated.

The invention discloses a heat treatment method for carrying out isothermal annealing on a railway vehicle axle in advance. The heat treatment method comprises the following steps that 1, isothermal annealing is carried out on the railway vehicle axle in advance; 2, the railway vehicle axle treated in the step 1 is subjected to normalizing one time or two times; 3, the railway vehicle axle treated in the step 2 is subjected to tempering. Compared with the prior art, the microscopic structure of the axle is uniform and tiny, the bad phenomena of grain size disqualification and ultrasonic flaw detection acoustic transmission caused when the open grain structure appears can be reduced, and fatigue crack caused by mixed crystals is prevented.

The invention discloses a muffler of an air conditioning compressor and the muffler comprises a front section connected with a liquid storage tank, a back section connected with a valve gate and a middle section which connects the front section and the back section. The lowest point of the middle part is higher than the bottom plane of the liquid storage tank and comprises at least one section of a circular arc tube distributing around the external circumference of the liquid storage tank, or a bending tube section formed by the transition connection of a plurality of sections of straight tubes in a circular arc way and distributed around the external circumference of the liquid storage tank. The improved muffler can effectively reduce the impact on the pipelines by the refrigerant inside the tube, thus reducing the vibration and noise of the pipelines; at the same time, the stress value of the pipelines is reduced and the stress distribution is improved, therefore, the tube breaking caused by fatigue of the muffler is avoided. At the same time, the muffler of the air conditioning compressor has a good comprehensive performance from the aspects of saving production cost, improving the energy efficiency ratio of the air conditioner and the reliability of the dropping transportation, etc.

The invention relates to the technical field of medical instruments, in particular to a method for designing a femoral stem prosthesis, and solves the problem that the existing femoral stem prosthesisis made of a material with high elastic modulus, so that the difference between the high elasticity and that of human femur is large, resulting in different degrees of stress shielding, the problem that the manufacturing process can hardly satisfy the manufacture requirement on customization and complex interior structure, so that high matching prostheses meeting the individual needs cannot be implemented, and other problems. The method comprises establishing an STL model, carrying out simulation operation to establish a model, establishing a finite element mesh model, establishing model material properties, establishing boundary conditions, setting topological optimization parameters and extracting an STL format file from the optimized model; and carrying out post-processing of fairing and the like to remove chessboard patterns in the software Inspire to obtain an optimized femoral stem model; manufacturing an optimized prosthesis with ti6al4v, and finishing the manufacture by meansof an electron beam melting technique through an Arcam Q10 plus metal printer. The method for designing the prosthetic stem structure adopts integral forming and has no need for cutting, splicing andother processing, and the structure is good in biocompatibility.