216results 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.

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 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 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.

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 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 discloses a three-dimensional elastic dynamic artificial vertebra. The three-dimensional elastic dynamic artificial vertebra comprises an elastic body, and two connecting bases connected to the upper end and the lower end of the elastic body respectively. Buffer slots are formed in the elastic body, so that the elastic body achieves the elastic deformation capacity, and a vertical channel is formed in the middle of the elastic body in a vertically through mode. The three-dimensional elastic dynamic artificial vertebra further comprises an elastic anti-bending mandrel and an elastic anti-bending shaft sleeve which are arranged in the vertical channel, the ends, away from each other, of the elastic anti-bending mandrel and the elastic anti-bending shaft sleeve are connected with the two connecting bases respectively to limit the connecting bases on the elastic body, the ends, close to each other, of the elastic anti-bending mandrel and the elastic anti-bending shaft sleeve are sleeved together, and the elastic deformation limits of the elastic anti-bending mandrel and the elastic anti-bending shaft sleeve are smaller than that of the elastic body. When the elastic anti-bending mandrel and the elastic anti-bending shaft sleeve deform and reach the elastic deformation limits, the elastic body cannot further deform, and therefore elastic failure and fatigue fracture of the elastic body are effectively avoided.