20results about How to "Avoid fatigue cracking" patented technology

The invention discloses a femtosecond laser strengthening method for improving the surface integrity of a laser cladding high-temperature alloy, and belongs to the technical field of laser cladding postprocessing, and the femtosecond laser strengthening method comprises the following steps: S1, selecting a proper high-temperature alloy as a base material, and cleaning and pretreating the surface of the base material; s2, a cladding laser is started to clad the base material; S3, a femtosecond laser system is set, and the optimal light beam quality and energy density are obtained; according to the method, the cladding surface is strengthened through femtosecond laser, the defects of cracks, air holes and the like appearing on the material surface after laser cladding are effectively removed, the surface integrity is greatly improved, premature failure caused by the problems of stress concentration and the like in the using process of components can be prevented through elimination of the surface defects, the service life of the components is prolonged, and the production cost is reduced. The safety and stability of the key hot end component are guaranteed, and the surface integrity of the high-temperature alloy component can improve the service performance and reliability under extreme loads such as high temperature, high flow speed and high pressure in the fields of aerospace and the like.

The invention belongs to the technical field of vibration tests, and particularly relates to a standard test piece vibration fatigue test clamp and an installation method, the standard test piece vibration fatigue test clamp comprises a clamp body and a clamping plate, and the clamping plate is inserted into the clamp body; the clamping plate comprises a transverse clamping plate, a longitudinal clamping plate, a columnar clamping plate and a mounting groove; the longitudinal clamping plate is vertically connected to one long side of the transverse clamping plate to form a T shape, the upper and lower plate surfaces of the transverse clamping plate protrude to form columnar clamping plates, and the mounting groove is located in the upper plate surface of the transverse clamping plate and extends to the opposite side from the side where the longitudinal clamping plate is located; preformed holes are formed in the longitudinal clamping plates; the clamp body is provided with a T-shaped groove, the shape of the T-shaped groove is the same as the projection of the clamping plate in the inserting direction of the clamping plate, and the clamp body is provided with a mounting hole communicated and matched with the preformed hole. When the clamping plate is inserted into the clamp body along the T-shaped groove, the mounting hole in the clamp body is connected with the preformed hole in the clamping plate through a bolt.

The application relates to the technical field of batteries, and discloses a battery cell and a battery pack. The battery cell comprises a shell with an open end, the open end of the shell forms a first end face, a cover plate assembly comprises a cover plate body, the cover plate body comprises a body part and a boss, the boss is connected to one side of the body part in the Z direction, the body part is lapped on the first end face, the boss extends into the inner cavity of the shell, and the boss is arranged in a spaced mode with the shell; a guide ring is sleeved on the boss and clamped between the boss and the shell, and the height of the guide ring in the Z direction is greater than the thickness of the boss in the Z direction. By sleeving the guide ring on the outer circumferential side of the boss, the area where the guide ring is in contact with the inner wall of the shell forms a support area, the setting of the guide ring increases the support height of the inner wall of the shell, improves the support stability, reduces the strain of the heat affected zone without increasing the thickness of the cover plate body, avoids the abnormal problem that the welding heat affected zone of the shell is prone to cracking under the action of a large fatigue stress, and improves the safety of the battery cell.

The utility model belongs to the technical field of continuous reactors, and particularly relates to a continuous reactor for producing methacrylate, which comprises an instrument body and a motor, a rotating shaft is arranged at the output end of the motor, a rotating frame is fixedly mounted at the bottom of the rotating shaft, a first gear is fixedly mounted on the outer side of the rotating shaft, and a second gear is arranged on the rotating frame. A supporting column is arranged at the bottom of the second gear, and a stirrer is fixedly installed at the bottom of the supporting column. The scraper blade stirrer is installed to clean the inner wall, the motor is started and drives the rotating shaft to rotate, when the rotating shaft rotates, the rotating shaft then drives the rotating frame to rotate, the second gear on the rotating frame starts to rotate along with rotation of the rotating frame and under the interaction of the first gear, and the inner wall is cleaned through the scraper blade stirrer. The second gear rotates to drive the stirrer to rotate, then stirring is conducted in the instrument body, the stirrer is installed, reaction of reactants can be accelerated, the reaction rate can be increased, and even mixing of raw materials can be promoted.

The utility model discloses a flexible disc of integrated starting gear ring structure relates to flexible disc technical field. The flexible disc of integrated starting gear ring structure, including flexible disc disc body, flexible disc outer end and starting tooth, is set up flexible disc waist hole on flexible disc disc body. The flexible disc of integrated starting gear ring structure, through the machining allowance of flexible disc outer end and remains starting tooth's processing forming, makes starting tooth and flexible disc outer end integrated moulding, cancels the welding of flexible disc outer end and starting gear ring in the prior art and becomes the design, avoids the size of welding scar and cannot standardization, and there is not one, reaches the assembly gear ring of reducing, prevents the occurrence of the incomplete welding, cancels the welding process flow, prevents the failure of welding scar crack, and reduces the cost of sub -parts, and the structure strength of flexible disc disc body is strengthened when the plate enhances the transmission torque, and the flexible disc waist hole symmetric distribution lightens disc body quality, and enough structural strength is reserved simultaneously.

The utility model relates to the field of rubber cups, and discloses a fillet transition rubber cup. According to the rubber sealing ring, stress acting on the rubber sealing ring can be more uniformly distributed through the design of the sealing ring fillets, local stress concentration is avoided, stress distribution is more uniform, material fatigue is reduced, fatigue cracking of the stress concentration place is avoided, meanwhile, the toughness of a product can be improved through the design of the sealing ring fillets, and the service life of the product is prolonged. According to the rubber sealing part of the component, external stress and pressure can be better borne, the risk of breakage or damage is reduced, in addition, the attaching performance of the rubber sealing ring and the contact face can be optimized due to the fact that the toughness is increased, the sealing effect is improved, normal operation of the product is ensured, and the performance requirement is met; the material fatigue can be reduced through the round corner design, and the fatigue cracking risk caused by stress concentration is reduced, so that the fatigue resistance of the sealing ring is improved, and the service life is prolonged.

The present invention discloses a blind plate automatic production line and a method for using the same, and belongs to the field of blind plate production technology. A blind plate automatic production line includes production line equipment for processing metal coils, and the production line equipment includes: a conveying seat, the conveying seat includes a first conveying frame and a second conveying frame arranged at intervals, and is used to limit the conveying of the metal coil; a cutting seat, the cutting seat is arranged on the second conveying frame, and is used to cut the metal coil, and the second conveying frame is provided with a same-distance displacement part for driving the cutting seat to move back and forth; and a cutting overheating prevention component, which is arranged on the cutting seat; the present invention can drive the cutting seat to synchronously displace with the metal coil being conveyed through the same-distance displacement part, and the downward moving cutter will not hinder the continuous conveying of the metal coil, and the cutting seat that has finished cutting the metal coil will automatically reset and move back to the next cutting position of the metal coil, so as to realize the non-stop punching of the metal coil, thereby improving the production efficiency of the blind plate.

The application discloses a shell-mounted magnetic shoe radial pressing clamp, which comprises a clamp base, a shell positioning assembly, two oppositely arranged pressing shoe assemblies, a pressing driving device for driving the two pressing shoe assemblies to move in the radial direction, a signal acquisition module and a controller. The pressing shoe assembly comprises a first arc-shaped bearing area and a second arc-shaped bearing area which are formed by being separated by a partition plate in the axial direction. The first arc-shaped bearing area and the second arc-shaped bearing area are connected to a pressing shoe rear plate through flexible beams. The two arc-shaped bearing seats are connected to the corresponding pressing shoe rear plates through independent flexible beams. The non-magnetic shoe contact side of each flexible beam is provided with a strain detection element. During the radial pressing of the magnetic shoe, the radial reaction force of the first arc-shaped bearing area and the second arc-shaped bearing area of the magnetic shoe is transmitted to the pressing shoe rear plate through the arc-shaped bearing seat and the corresponding flexible beam, and the two strain detection elements output corresponding first stress signals and second stress signals respectively.

This utility model relates to the field of hydraulic cylinder technology, specifically to a telescopic cylinder for a roadheader, comprising a cylinder body with a cavity inside. A piston rod is disposed within the cavity, with its end extending out of the cylinder body. A spacer block with several through holes is located at the bottom of the cavity. A piston is disposed at the bottom of the piston rod and is slidably connected to the inner wall of the cylinder body. A piston seal is also provided on the outer wall of the piston. A limiting sleeve is provided at the top of the piston and is fitted onto the piston rod. A guide sleeve is provided at the end of the cylinder body, through which the piston rod passes. This utility model effectively prevents deformation of the telescopic cylinder and improves the stability and reliability of cylinder operation.

The invention discloses an anti-scouring device and a mounting method. The anti-scouring device comprises a pile body, a sliding block, a plurality of bottom rods, a blocking part and a plurality of connecting rods. The pile body extends in the first direction, the pile body is sleeved with the sliding block, and the sliding block is slidably connected with the pile body. The multiple bottom rods are rotationally connected with the pile body and distributed in the circumferential direction of the first direction at intervals, the blocking parts are connected with the bottom rods, the connecting rod is provided with a first end and a second end which are oppositely arranged in the length direction of the connecting rod, the first end is rotationally connected with the side, away from the pile body, of the sliding block, and the second end is rotationally connected with the bottom rods. The anti-scour device is configured to have a gathering state and an unfolding state, in the gathering state, the blocking part is close to the pile body, in the unfolding state, the blocking part is away from the pile body, and the sliding block moves in the first direction, so that the anti-scour device is switched between the gathering state and the unfolding state. The self-state can be flexibly adjusted, development of scouring of the seabed around the pile is restrained, and the pile is low in cost, long in life cycle and high in adaptability.

The utility model relates to the technical field of joint connection discloses a kind of upper joint of connecting mechanism, including first joint body, first joint body includes pressure bottom plate, transition sleeve and two wing plates, two wing plates are symmetrically arranged in pressure bottom plate both sides, wing plate includes rectangular part and trapezoidal part, rectangular part is connected with pressure bottom plate, rounding treatment is carried out between rectangular part and pressure bottom plate, and the rounding radius of rectangular part and the inner wall of pressure bottom plate is greater than the rounding radius of rectangular part and pressure bottom plate outer wall, transition sleeve is arranged in the middle of one end of pressure bottom plate away from wing plate, wing plate, pressure bottom plate and transition sleeve outer wall are symmetrically provided with reinforcing rib;By setting wing plate and pressure bottom plate form stable bearing frame of U, and cooperate with the middle support structure of transition sleeve, the lift, thrust, lateral force and torsional load generated by flight body can be simultaneously and efficiently transferred, to avoid single direction stress concentration.

The utility model discloses a composite asphalt concrete pavement structure based on RUHPC, which comprises a surface layer, a base layer and a subbase layer, the surface layer is composed of an asphalt layer, a bonding layer and an ultra-high performance concrete layer from top to bottom, the base layer is composed of 5%-6% of cement stabilized macadam, the subbase layer is composed of 4%-5% of cement stabilized macadam, the surface layer is 4-10cm thick, and the bonding layer is 4-10cm thick. The total thickness of the ultra-high performance concrete layer and the bonding layer is 3-6 cm. According to the utility model, the raw material of the asphalt concrete surface layer is saved by 1 / 2 to 2 / 3, the material consumption and the environmental burden are obviously reduced, and the thickness design of the RUHPC layer is flexible and high in adaptability; the utility model not only embodies the pursuit of efficient utilization of resources, but also actively responds to the development trend of low carbon and environmental protection, and shows the technical progress and sustainable advantages of the utility model in the field of road construction.

The utility model discloses a continuous press steel band drive roller axle and end plate's connecting structure, including drive roller axle and end plate, its drive roller axle's both ends adopt interference fit mode and hot jacket assembly technology and install on end plate. The utility model makes end plate material produce elastic deformation, and the powerful radial pressure that forms, relies on the friction between drive roller axle and end plate hole contact surface and transmits greater torque and bears greater axial force, and stress distribution is relatively even, and forms the continuous compression stress in interference fit area, so that drive roller axle and end plate connection intensity and reliability are higher than welding structure.

This invention relates to the field of coating technology, and provides a high weather-resistant composite coating for photovoltaic profiles and its preparation method, solving the problems of poor weather resistance of existing photovoltaic profile coatings and their inability to simultaneously achieve anti-corrosion, superhydrophobic self-cleaning, heat insulation, and antistatic properties. The coating comprises, sequentially from the aluminum alloy substrate outwards, a primer layer and a topcoat layer. The primer layer comprises the following raw materials in parts by weight: 60-80 parts epoxy resin, 0.3-1.0 parts silane-modified graphene oxide, 8-15 parts curing agent, and 5-15 parts mixed solvent. The topcoat layer comprises the following raw materials in parts by weight: 70-90 parts modified hydroxyl fluorocarbon resin, 5-15 parts functional filler, 1-5 parts additives, and 10-20 parts organic solvent. The modified hydroxyl fluorocarbon resin has a hydroxyl-containing fluorocarbon resin main chain, and its side chains are covalently grafted with perfluoropolyether groups.

The utility model relates to a kind of high toughness base for machine tool, including base body, the hollow setting is formed cavity in the base body, multiple first support plate and multiple second support plate are crossly set in the cavity, rectangular slot is set in the first support plate and second support, and the four feet of the rectangular slot are rounded corner settings.A kind of high toughness base for machine tool of the utility model, by setting multiple first support plate and multiple second support plate, the strength of base is guaranteed by supporting base, and rectangular slot is set to reduce the weight of base, and inside angle uses rounded corner transition, force transmission becomes smooth, stress peak is eliminated, fatigue crack and sudden fracture of part under alternating load can be effectively prevented, the reliability and life of product are greatly improved, the root of stress concentration of sharp corner is solved, and the problem that effective fatigue strength and impact toughness of structure can be greatly reduced.

The utility model relates to embankment pipe installation technical field discloses a kind of embankment pipe outlet structures, it includes embankment pipeline, outlet elbow pipe, outlet abutment and anti-scouring component;Embankment pipeline is set to the inside of embankment retaining wall, and the axis of embankment pipeline is along horizontal direction and penetrates embankment retaining wall;One end of outlet elbow pipe is connected with embankment pipeline, the other end of outlet elbow pipe is curved to the downstream direction of river channel for discharging accumulated water to river channel, and gap is provided between outlet elbow pipe and embankment retaining wall;Outlet abutment is cast and fixed to the outside of the bending position of outlet elbow pipe, and the bending part of outlet elbow pipe is circular arc shape, and outlet abutment is used to suppress outlet elbow pipe vibration;Anti-scouring component is set to the outside of outlet elbow pipe terminal, and anti-scouring component is used to dissipate energy and prevent scouring.The utility model is designed by outlet elbow pipe and outlet abutment, effectively reduce the impact of outlet elbow pipe effluent on river channel original water flow system, ensure the stability of river channel original water flow system.

The application discloses a layout wiring method, device and equipment of a special-shaped bending PCB and a medium, relates to the technical field of hardware circuit design, and aims at solving the problem that the existing general PCB layout wiring method cannot meet the high-precision, high-reliability and long-service-life use requirements of an inkjet printing device with a special-shaped bending working condition. The method comprises the following steps: dividing the special-shaped bending PCB into a rigid fixing area, a flexible bending transition area and a limit bending core area according to the bending radius; arranging devices in the rigid fixing area and the flexible bending transition area; adopting different wiring rules to wire each area respectively to obtain a wired special-shaped bending PCB; and performing copper laying, via arrangement and round corner processing on the wired special-shaped bending PCB to complete the layout wiring of the special-shaped bending PCB. The layout wiring method of the special-shaped bending PCB is used to improve the printing precision, reliability and service life of the inkjet printing device with the special-shaped bending working condition.

The primary agricultural product drying processing equipment comprises a drying box and an air heater, the air heater is installed on the end face of the drying box, an air outlet is communicated with the interior of the drying box, one side of the drying box is open, and a stress buffering mechanism is installed on the outer wall of a connecting rod. By arranging the second spring and the balls on the connecting block, the balls are in rolling contact with the arc-shaped grooves of the fixing frame, traditional rigid collision is converted into rolling friction, friction force and impact force in the contact process are greatly reduced, stress is prevented from being concentrated on local positions, and meanwhile when equipment is vibrated or impacted, the equipment is prevented from being damaged. The second spring can play a buffering role in time, absorb and disperse impact force and prevent the impact force from being directly transmitted to the fixing plate and the fixing frame, so that fatigue cracks caused by the fact that parts are in a stress concentration state for a long time are effectively prevented, the service life of key parts of equipment is greatly prolonged, and the maintenance cost and replacement frequency of the equipment are reduced.

The invention relates to the technical field of belt conveying equipment, in particular to a belt tearing detection and early warning method based on stripe marks, which comprises the following steps of: performing a test experiment on a stripe marked belt; adjusting the roller spacing of the conveyor belt based on the belt area ratio of the stripe-marked belt, calibrating the preset width of the oblique stripe-marked area according to the heat dissipation performance ratio, and correcting the gap uniformity of the oblique stripe-marked area according to the thermal expansion amount, an actual oblique stripe marking belt is arranged according to the adjusted roller distance, the calibrated preset width and the corrected gap uniformity, and whether the belt has the risk of tearing or not is judged according to the stripe width variable coefficient of the oblique stripe marking area. According to the method, the optimal roller spacing, the stripe width and the stripe gap uniformity of the belt are obtained by carrying out multi-working-condition simulation test on the stripe marked belt, and the problems that in the prior art, the deformation precursor of the belt cannot be sensed through laser projection, and tearing early warning is difficult to achieve are solved.

The invention provides a welding connection method for high-manganese steel and a steel rail, which comprises the following steps that a transition piece and the steel rail are connected and fixed through flash welding to form a middle piece, and the transition piece is used for connecting a high-manganese steel piece to be welded and the steel rail; normalizing heat treatment is conducted on the middleware, and thermal aging treatment is conducted on the middleware subjected to normalizing heat treatment; and the transition piece and the high manganese steel piece to be welded are connected and fixed through flash welding, so that the high manganese steel piece to be welded and the steel rail are connected and fixed. According to the welding connection method for the high manganese steel and the steel rail, the performance of a final connecting piece product can be effectively improved, internal residual stress of the final connecting piece product is reduced, and the service life of the final connecting piece product is prolonged.