61results about How to "Reduce shear stress" patented technology

The invention relates to the technical field of expansion joints, in particular to an anti-corrosion and anti-dust corrugated pipe expansion joint which comprises a corrugated pipe, end pipes, flanges and a pull rod, the two ends of the corrugated pipe are connected with the end pipes, the end pipes are provided with connecting blocks with cambered surfaces, channels connected with the end pipes are formed in the connecting blocks, through openings communicated with the channels are formed in the flanges, and the pull rod is arranged in the through openings. A connecting cavity is formed in the flange, the connecting block is movably connected into the connecting cavity, a rubber ring is arranged on the side, located on the corrugated pipe, of the connecting cavity, the cambered surface is located on one side of the rubber ring, and an adjusting assembly with a push rod is arranged on the flange. The corrugated pipe is changed into a linear shape under the action of self stress through thermal expansion and cold contraction, and the sealing performance of the corrugated pipe expansion joint is ensured when a pipeline starts to convey materials, so that the shearing stress generated by bending of the corrugated pipe due to pipeline deformation is reduced, and the service life of the anticorrosive and dustproof corrugated pipe expansion joint is prolonged.

The invention relates to the field of photo interrupter packaging technology, in particular to a reflective photo interrupter packaging structure, a secondary pressing mold and a packaging method.The reflective photo interrupter packaging structure comprises an optical assembly, and the optical assembly comprises a light source and a light receiver and is used for emitting and receiving light rays; the circuit board is a split circuit board and is used for bearing the light source and the light receiver respectively; the first packaging layer covers the optical assembly and the circuit board and is made of an epoxy resin material; the second packaging layer covers the first packaging layer and is made of an epoxy resin material; a part of the circuit board penetrates out of the first packaging layer and the second packaging layer and is used for being connected with an external circuit. The packaging structure has the effect of improving the packaging stability and reliability of the reflective photo interrupter.

The present invention relates to the technical field of cutting fluids, and in particular to a water-based high-lubricity cutting fluid and a preparation method thereof, comprising triethanolamine, an oily corrosion inhibitor, a lubricating additive, benzotriazole, a surfactant, a potassium hydroxide solution, a pH regulator and deionized water. The water-based high-lubricity cutting fluid in the present invention is compounded by lubricating additives, triethanolamine, an oily corrosion inhibitor, benzotriazole, a surfactant and the like, wherein the sulfide fatty acid ester embedded in the lubricating additive is thrown out from the pores under the action of centrifugal force when subjected to a high centrifugal speed, and adheres to the metal surface to form a dense sulfide film, which plays a lubricating role, can effectively reduce shear stress, reduce friction and power consumption, reduce the temperature of the friction part between the tool and the workpiece and the tool wear, improve the cutting performance of the workpiece material, and improve the lubrication performance of the cutting fluid, so that it has the characteristics of small usage and high cutting quality.

The invention relates to the technical field of electric power construction, and discloses a quick paying-off and wire stripping device for electric power construction, which comprises a bearing box, a protective layer stripping assembly and an insulating layer stripping assembly are arranged on the bearing box, the protective layer stripping assembly is used for stripping a protective layer, and the insulating layer stripping assembly is used for stripping an insulating layer. According to the cable stripping device, a pre-cutting opening is formed in a protective layer through a cable stripping blade on the stripping wheel, so that a cable core cannot be exploded before formal stripping of a cable, and during formal stripping, due to the arrangement of the pre-cutting opening, the protective layer can be easily torn off, and the stability and convenience of cable stripping are effectively improved; a stripping wheel is arranged, so that a worker can control the insertion depth of a wire stripping blade into a protective layer according to the thickness of the protective layer, and the wire stripping blade is prevented from damaging a wire core; by arranging the separating table, the protective layers and the insulating layers are automatically separated, meanwhile, the distance between the insulating layers is increased, subsequent stripping treatment work on the insulating layers is facilitated, and the stripping efficiency is improved.

The invention provides an SIC chip and a manufacturing method thereof, and belongs to the field of semiconductors. The manufacturing method of the SIC chip comprises the steps that the SIC chip is provided, passivation layers are deposited on the inner wall and the bottom of a through hole, and the passivation layers extend to a metal covering layer around the through hole; forming a first PI layer on the surface of the passivation layer, and filling the through hole; a second PI layer is formed on the surface of the first PI layer, and the first PI layer and the second PI layer are opposite in adhesive property; and forming a plastic package layer on the surface of the second PI layer, wherein the plastic package layer covers the second PI layer and the metal covering layer. According to the invention, two PI layers with opposite colloidality are formed. By using the two PI layers, the surface stress gradient structure of the SIC chip can be formed, and the shear stress between the molding compound and the SIC chip in the thermal cycle process can be effectively reduced, so that the shear stress at the edge and the corner of the SIC chip can be reduced, the layering of the SIC chip and the molding compound and the cracking of the SIC chip can be avoided, and the service life of the SIC chip is prolonged. And physical property abnormity and electrical property failure of the device can be further avoided.

The invention relates to the technical field of electric power calandria construction, and discloses a soft soil foundation electric power calandria connecting and fixing structure and a construction method.The soft soil foundation electric power calandria connecting and fixing structure comprises a bottom plate, supporting mechanisms are arranged on the two sides of the upper portion of the bottom plate correspondingly, mounting plates are fixedly connected to the two sides of the exterior of the bottom plate correspondingly, and reinforcing mechanisms are arranged on the two sides of the interiors of the two mounting plates correspondingly; the supporting mechanism comprises first arc-shaped blocks, the first arc-shaped blocks are arranged on the two sides of the upper portion of the bottom plate, and the rear sides of the exteriors of the first arc-shaped blocks are rotationally connected with connecting plates. The bottom plate is placed on a soft soil foundation, supporting is provided, foundation pressure is dispersed, the first arc-shaped block is adjusted according to the length of the electric power calandria, the H-shaped insertion block is inserted into the H-shaped insertion groove of the bottom plate, stable connection is formed, shearing stress of reinforcing steel bars is reduced, then the second arc-shaped block is opened, the electric power calandria is clamped by the second arc-shaped block and the first arc-shaped block, and gravity and shearing force are evenly dispersed. Shear force concentration is avoided, steel bar deformation is reduced, and the service life is prolonged.

The invention relates to the technical field of jet flow heat exchangers, in particular to a longitudinal flow integral baffle plate jet flow heat exchanger. The axis of the horizontal structure is longitudinally horizontal; comprising a tube box, a tube plate, a barrel and a seal head which are sequentially connected from left to right, the heat exchanger further comprises a medium inlet, a medium outlet, heat exchange tubes and baffle plates. The medium inlet is vertically arranged and is fixedly connected to the top of the left end of the cylinder body; the medium outlet is vertically formed and fixedly connected to the bottom of the right end of the barrel; the multiple baffle plates are vertically arranged and fixedly connected into the cylinder body, the baffle plates are integrated, and the flow direction of shell pass fluid is longitudinal flow in the axial direction of the cylinder body; and the heat exchange tubes are longitudinally and horizontally arranged on the tube plate. The whole baffle plate is adopted, the jet flow holes are formed, the flow direction of shell pass fluid is longitudinal flow in the axial direction of the shell, fluid induced vibration is effectively eliminated, and abrasion of a tube bundle is reduced.

The utility model relates to the technical field of sofas, in particular to a sofa armrest with a heat dissipation structure, the sofa armrest with the heat dissipation structure comprises an armrest main body, the armrest main body is provided with a groove for installing a thermostat, the groove is internally connected with a partition plate, and the partition plate divides the groove into a first cavity and a second cavity which are mutually independent; an air inlet for feeding air into the constant-temperature box and an air outlet for dissipating heat of the constant-temperature box are formed in the armrest main body, the air inlet is communicated with the first cavity, and the air outlet is communicated with the second cavity. According to the constant-temperature box, the situation that dissipated hot air is sucked into the constant-temperature box again can be reduced.

The application discloses a large-angle variable stiffness flexible joint, which is composed of a plurality of flexible joint modules stacked together; the flexible joint module comprises a lower chassis, a spiral winding type driver, an elastic main bone and an upper chassis, one end of the elastic main bone is connected with the upper chassis, and the other end is connected with the lower chassis; N spiral winding type drivers are connected between the upper chassis and the lower chassis, and N is greater than or equal to 3; the lower chassis is provided with a buckle mounting groove; the upper chassis is provided with a buckle; the spiral winding type driver is provided with a metal wire; the metal wire is connected with a control system; the elastic main bone is of a space groove type structure; the space groove type structure is provided with one or more symmetrical notches on the elastic main bone; and the stiffness of the elastic main bone is adjusted by adjusting three parameters of a groove height H, a groove inner diameter D and a groove spacing AH. The application adopts modular design and the elastic main bone is adjustable, and large-angle bending and variable stiffness of the flexible joint are realized.

The invention provides a spacer, a turbocharger and a nozzle module of the turbocharger. The spacer includes: a spacer portion; a first assembling part and a second assembling part; comprising at least one of a first transition section, a middle section and an assembly section, the radial size of at least part of the first transition section and the middle section is smaller than that of the assembly section, and a gap is formed between the first assembly section and a first assembly hole of the nozzle ring; the second assembling part comprises a first transition section, a middle section and an assembling section, the radial size of at least part of the first transition section and the middle section is smaller than that of the assembling section, and a gap is formed between the second assembling part and a second assembling hole of the pipe flange. According to the nozzle module, sufficient gaps are formed after the middle sections of the first assembly part and the second assembly part are assembled with the assembly holes of the nozzle ring or the pipe flange, so that deformation of the nozzle module caused by high temperature is buffered, and spacer materials flowing towards the middle sections in the fixed connection process of the assembly sections and the assembly holes such as riveting and the like are contained; the problem of cracks caused by the manufacturing process can be solved.

The utility model relates to the technical field of battery modules, and discloses a module boxing positioning structure which comprises a battery cell module and a box body cross beam, an end plate is installed on one side, close to the box body cross beam, of the battery cell module, a limiting piece protruding upwards is installed on the box body cross beam, a groove matched with the limiting piece is formed in the bottom of the end plate, and the end plate is connected with the box body cross beam. And the end plate is clamped and positioned with the lug boss of the limiting piece through the groove. According to the battery cell module, the end plates are arranged on the two sides of the battery cell module to form the module body, the convex limiting piece is arranged on the box body cross beam, and the grooves formed in the bottom ends of the end plates are clamped with the convex parts of the limiting piece, so that the module body and the box body cross beam are quickly positioned; and meanwhile, the side wall of the groove corresponds to and clings to the periphery of the convex part of the limiting piece, so that the bottom of the end plate can be tightly clamped with the limiting piece, the positioning precision is favorably improved, and the module body is prevented from accidentally moving.

The invention discloses a method for preparing polyethylene by using hexene as a comonomer through a slurry method and high-molecular-weight polyethylene. Monomer ethylene and comonomer 1-hexene are used as raw materials; uniformly mixing a catalyst and supercritical ethane fluid to prepare a catalyst solvent; raw materials, a catalyst solvent, hydrogen and supercritical ethane fluid are continuously added into a first stirring reaction kettle for a prepolymerization reaction, slurry discharged from the first stirring reaction kettle enters a second stirring reaction kettle for a polymerization reaction, and after polymerization is completed, the slurry is subjected to post-treatment to obtain a finished product. According to the method for preparing the polyethylene by the slurry method by taking the hexene as the comonomer, the melt index, the density and the molecular weight of the product can be improved by the supercritical ethane, and the impact resistance of the material is enhanced.

The invention provides a display device. The display device comprises a substrate; a driving device layer disposed on the substrate; a flat layer disposed on the driving device layer, the flat layer including a plurality of trenches; each light-emitting device comprises an anode, a light-emitting layer and a cathode, a first part of the anode of the first light-emitting device is arranged on the flat part of the flat layer, a second part of the anode of the first light-emitting device is arranged on the first side wall and the bottom of the first groove, and a third part of the anode of the first light-emitting device is arranged on the side wall of the second groove; the third part of the anode of the second light emitting device is arranged on the second side wall of the first trench; and a plurality of first partition walls disposed in the trench and covering the second portion of the anode of the first light emitting device and the third portion of the anode of the second light emitting device. According to the technical scheme, the shear stress between the first partition wall and the surface of the anode is reduced, and the surface of the anode is prevented from being damaged.

The invention relates to the technical field of tunnel engineering, aims to solve the problems that an existing flexible connector is prone to breakage when being impacted, the protection effect is difficult to achieve, the connector and a tunnel lining are prone to damage, and potential safety hazards are caused, and provides a tunnel lining self-adaptive segment flexible connecting structure. Comprising a flexible connector arranged between two adjacent secondary lining sections, and the two ends of the flexible connector are used for being connected with the ends of the secondary lining sections on the two sides of the flexible connector respectively; the flexible connector comprises a framework, the interior of the framework is of a hollow structure, and the framework has rigidity and elasticity and can prevent the framework and a lining from being damaged and adapt to tunnel deformation; the flexible connecting structure has certain rigidity, so that the secondary lining section joints have high rigidity, and the secondary lining section joints are not prone to breakage when subjected to large earthquake damage or large-scale energy impact; and in addition, high elasticity and restorability are achieved, large deformation can be adapted, and the anti-dislocation capacity of the tunnel structure is improved.

The invention discloses an aluminum alloy profile for a rocket stringer and a preparation method of the aluminum alloy profile. The aluminum alloy profile for the rocket stringer consists of the following elements in percentage by weight: 2.2-2.4% of Cu, 2.9-3.4% of Mg, 7.3-7.9% of Zn, 0.05-0.15% of Zr, less than or equal to 0.05% of Fe, less than or equal to 0.1% of Si and the balance of Al. The preparation method comprises the steps of extrusion, solid solution heat treatment, stretch straightening, aging heat treatment and the like. The advantages of high purity, high strength, high rigidity, high safety and the like of the 7050-8 aluminum alloy material are utilized, development of the 7050-8 aluminum alloy profile product for the launch vehicle stringer is developed, core technologies such as mold design, extrusion forming, heat treatment strengthening and finishing treatment are overcome in the development process, the launch vehicle structure efficiency in China is improved, and the production cost is reduced. The prepared profile meets the application requirements of a new-generation carrier rocket structure, and application and iteration of a new aluminum alloy material are promoted.

The present invention belongs to the field of bogie primary suspension systems, and specifically relates to a leaf spring protection structure and suspension system, comprising an elastic block which is arranged on the upper and lower outer surfaces of the leaf spring and is in contact with the spring leaf of the leaf spring, the shape of one side of the elastic block in contact with the spring leaf matches the shape of the spring leaf, the shape of the other side of the elastic block matches the shape of a mounting part, and both ends of the elastic block extend to end connectors of the leaf spring. The present invention can effectively protect the leaf spring and prevent damage.

A double-fork-arm type aluminum alloy front steering knuckle for laterally installing fixed calipers comprises a steering pull rod installation part used for installing a steering pull rod, a hub bearing installation part provided with a bearing installation flange face surrounding a bearing via hole, and two boss structures which are formed on the side edges of the front steering knuckle on the opposite sides of the steering pull rod and are separated from each other. The boss structure comprises a vertical face perpendicular to the bearing installation flange face and a threaded structure transversely formed on the vertical face of the boss and perpendicular to the hub bearing direction, and the fixed calipers and the front steering knuckle are laterally matched together through the threaded structure to be locked. Therefore, the structural rigidity and the fatigue life of the knuckle calipers can be improved.

The invention discloses a pin wheel housing and an RV speed reducer, and relates to the technical field of speed reducers, the pin wheel housing comprises a base body and a groove, a plurality of tooth grooves are evenly distributed in the peripheral wall of an inner hole of the base body, and the tooth grooves are used for being matched with tooth pins so as to play a role in positioning and guiding, and it is guaranteed that the tooth pins are located at correct positions and motion trails. A connecting part is formed between every two adjacent tooth grooves, a groove is formed in each connecting part, and a first edge part and a second edge part are formed between each groove and the corresponding two adjacent tooth grooves respectively. And the first edge part and the second edge part can enable the connecting part to have certain strength, so that the edge of the groove is prevented from being damaged and cracked, and the reliability of the pin wheel housing is improved. By arranging the groove, the fit clearance between the cycloidal gear and the connecting part can be increased, and the shear stress can be reduced when the fit clearance is increased, so that the power loss caused by grease stirring is reduced, and the transmission efficiency is improved.

The present invention belongs to the technical field of small engineering tire production and manufacturing, and specifically relates to a small engineering tire belt structure. The belt structure of the present invention includes, from bottom to top, a first belt layer, a first filling layer, a second belt layer, a second filling layer, a third belt layer, and a fourth belt layer that are tightly attached together, and also includes a zero-degree belt layer, wherein the first filling layer is applied between the first belt layer and the second belt layer, the second filling layer is applied between the second belt layer and the third belt layer, and the zero-degree belt layer is arranged at the ends of the third belt layer and the fourth belt layer. The belt structure of the present invention can reduce the shear stress between the belt layers during the use of the tire, and the restraint of the shoulder zero-degree belt layer reduces the deformation of the belt layer end, reduces the tire shoulder space, and increases the tire service life.

The embodiment of the present application provides a kind of infusion tube assembly and infusion equipment.The infusion tube assembly is applied to the infusion equipment with infusion tube, and the infusion tube assembly includes joint, infusion tube and silica gel tube.The first channel for liquid flow is formed in the inside of joint, for being communicated with one end of first channel;The second channel for liquid flow is formed in the inside of silica gel tube, and the second channel is communicated with the other end of first channel, and the hardness of silica gel tube is lower than the hardness of infusion tube;The joint and silica gel tube are integrated, so that the joint is communicated with silica gel tube and infusion equipment.The infusion tube assembly and infusion equipment provided by the embodiment of the present application set up the integrated structure of joint and silica gel tube, do not need to be installed by adhesive, can reduce the process of assembly, improve the reliability of joint and silica gel tube connection, and guarantee the consistency of production.

The present invention discloses a spiral centrifugal impeller, comprising a hub and at least one continuous spiral blade coaxially arranged with the hub and fixedly mounted on the hub, the hub is provided with a through hole coaxial with the spiral blade, each spiral centrifugal blade comprises a working surface and a back surface, the working surface is a three-dimensional space curved surface, the contour line of the working surface comprises an inlet edge, an outer edge line, a hub line and an outlet edge, the inlet edge and the outlet edge are arranged in a straight line, the thickness section of the spiral centrifugal blade is narrowed along the direction from the outer edge to the hub, the working surface and the back surface are connected by a connecting surface at the outer edge line, the connecting surface is inclined up and down along the direction from the back surface to the working surface and has an inclination angle α, the inclination angle α gradually decreases to 0° in the spiral direction from the inlet edge to the outlet edge, and the length of the outlet edge is less than the length of the inlet edge. The present invention includes at least the following advantages: it can avoid the occurrence of hemolysis and greatly improve the blood compatibility of the blood pump.

The application discloses a retired power battery pack disassembling industrial robot operation device and method thereof, and belongs to the technical field of new energy automobile battery recycling, and comprises the following steps: S1, an industrial robot, a Z-direction flexible floating connection mechanism and an air floating ultrasonic composite cutter head assembly are arranged, wherein the Z-direction flexible floating connection mechanism is located below a terminal flange interface of the industrial robot; the air floating ultrasonic composite cutter head assembly and the Z-direction flexible floating connection mechanism are arranged, and a physical self-adaptive system based on fluid statics is constructed; when the cutter head driven by the industrial robot encounters a battery bump, the suspension gap is compressed, the flow resistance effect of airflow in the narrow gap causes the static pressure in the air film to rise exponentially, the aerodynamic repulsive force generated in the instant directly breaks the mechanical balance model, overcomes the pre-tightening force set by the Z-direction flexible floating connection mechanism, and drives the cutter head assembly to physically give way along the Z-axis direction within milliseconds.

The invention relates to the technical field of tread pattern design, and discloses a tire with concave-convex grooves in tread pattern groove walls, which comprises a tread, four circumferential grooves formed in the tread and extending along the tire circumference C direction, and transverse grooves extending towards the outer side of the tire width L direction. The circumferential grooves and the transverse grooves divide the tread into a plurality of block-shaped patterns, and the block-shaped patterns sequentially comprise an inner side shoulder block, an inner side close-to-center block, a middle block, an outer side close-to-center block and an outer side shoulder block from the inner side to the outer side of the tire. According to the tire with the concave-convex grooves in the tread pattern groove wall, the transverse groove of the tread is optimally designed, the groove wall of the groove is specially designed, and design parameters such as the position and the size of the concave-convex grooves in the groove wall are reasonably configured, so that the effects that the noise, the control safety performance and the durability can reach relatively high levels, and other performances are kept optimal are achieved.

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 invention discloses a roadbed widening pile-slab structure and a construction method thereof. The connection problem of a pile plate structure, a newly-built widened roadbed and an existing road roadbed is particularly important. The connecting structure is used for connecting a newly-built widened roadbed and an existing roadbed and comprises a bearing plate, and longitudinal butt straps are arranged on the two sides of the bearing plate in the longitudinal bridge direction correspondingly; a transverse butt strap is arranged between the two longitudinal butt straps; a pile foundation is arranged below the bearing plate, and a stem slope is arranged between the bearing plate and the pile foundation; the bearing plate is connected with the newly-built widened roadbed and the existing roadbed through brackets; the longitudinal butt strap and the transverse butt strap are connected with the bracket of the bearing plate through studs; a concrete bridge floor cast-in-place layer is arranged above the bearing plate, the longitudinal butt strap and the transverse butt strap; the waterproof layer is located between the concrete bridge deck cast-in-place layer and the asphalt concrete bridge deck pavement layer. Stable connection between the newly-built widened roadbed and the existing roadbed is achieved, and the requirement for the safe distance of important pipelines when the roadbed is widened is met.

The invention relates to the technical field of tubular heat exchangers, in particular to a jet heat exchanger. The axis of the horizontal structure is longitudinally horizontal; comprising a left tube box, a left tube plate, a left barrel, a conical section, a barrel, a right tube plate and a right tube box which are sequentially connected from left to right. The heat exchanger further comprises a medium inlet, a medium outlet, heat exchange tubes and baffle plates. The medium inlet is vertically arranged and is vertically and fixedly connected to the top of the left barrel body; the medium outlet is vertically arranged and is vertically and fixedly connected to the bottom of the right end of the cylinder body; the plurality of baffle plates are vertically arranged and are fixedly connected into the cylinder body; the axes of the heat exchange tubes are longitudinally horizontal, and the two ends are connected with the left tube plate and the right tube plate respectively. The flow field distribution is relatively uniform, almost no heat transfer dead zone exists, the shear stress between the tube bundle and the supporting structure is effectively reduced, the transverse scouring to the tube bundle is also eliminated, the fluid induced vibration is effectively eliminated, and the wear of the tube bundle is reduced.

The invention discloses a high-durability gradient reinforced composite material for an aircraft tire and a tire bead structure of the aircraft tire. The Shore A hardness of the high-durability gradient reinforced composite material is 50-75 degrees, the 100%-300% stress at definite elongation is larger than or equal to 5 MPa, the tensile strength is larger than or equal to 20 MPa, and the elongation at break is larger than or equal to 450%. In the thickness direction, the high-durability gradient reinforced composite material has a hardness gradient and / or a modulus gradient. Tire bead reinforcing rubber is arranged between tire bead rubber and the rim edge of the tire bead structure of the aircraft tire, the tire bead reinforcing rubber adopts the high-durability gradient reinforced composite material, the hardness of the tire bead reinforcing rubber is gradually increased and / or the modulus is gradually increased in the direction from the tire bead rubber to the rim edge, the concentration phenomenon of dynamic strain is effectively reduced, the heat generation amount is reduced, and the service life of the tire bead structure is prolonged. Material aging and performance degradation caused by high temperature are avoided, the durability and fatigue resistance of the tire bead structure are remarkably improved, and the use requirements of aircraft tires under high-load and high-frequency strain working conditions are met.

This invention provides a forming method for small-diameter bimetallic composite welded pipes, belonging to the field of steel pipe welding and forming technology. The method involves using a bimetallic composite steel strip, composed of a carbon steel base layer and a corrosion-resistant metal layer, as raw material. The strip is continuously bent into a C-shape and further closed into an O-shaped pipe blank using several roll forming assemblies with upper and lower pressure rollers. The corrosion-resistant metal layer forms the inner surface of the pipe blank after forming. During the forming process, differentiated pressing forces are applied to the upper and lower pressure rollers based on the pre-measured yield strength difference between the carbon steel base layer and the corrosion-resistant metal layer. This guides the coordinated deformation of the two metal layers and reduces interlayer shear stress. The forming method for small-diameter bimetallic composite welded pipes provided by this invention applies different pressing forces to the upper and lower pressure rollers, guiding the two metal layers to achieve coordinated deformation during bending and reducing the shear stress at the interlayer interface.

The present invention discloses a composite foundation of controllable rigid piles and compacted gravel piles and a construction method thereof, the foundation comprising a soft soil foundation, a sand cushion layer laid on the soft soil foundation and a drainage ditch arranged outside the sand cushion layer; a plurality of rigid piles are arranged in the soft soil foundation; a sleeve is arranged on the rigid pile, the top of the sleeve extends upward to the top surface of the sand cushion layer, and the bottom end of the sleeve is contracted to tightly sleeve the rigid pile; the sleeve is respectively connected to a grouting pipeline and a grouting pipeline; cement slurry is injected into the sleeve, and a cover plate is arranged on the sleeve; a plurality of gravel piles are evenly arranged in the sand cushion layer around the cover plate, the top of the gravel pile is flush with the top surface of the sand cushion layer, and the bottom end of the gravel pile penetrates the sand cushion layer and extends into the soft soil layer. The composite foundation of controllable rigid piles and compacted gravel piles of the present invention can reduce the maximum-minimum principal stress difference and shear stress of the foundation soil, thereby improving the foundation stability.

The utility model provides a kind of bottom flow regulator and hydraulic cyclone of bushing integration, this bottom flow regulator includes upper socket fixing piece, the elastic hose for being connected with the bottom flow outlet of hydraulic cyclone, telescopic mechanism and movable lower socket, two ends of the elastic hose are respectively fixedly connected with upper socket fixing piece, movable lower socket, it is connected between upper socket fixing piece, movable lower socket by telescopic mechanism;The telescopic mechanism includes outer tube and inner tube, and the inner tube is located in the outer tube and is movably connected, by adjusting the relative position of outer tube and inner tube, the elongation of elastic hose is changed, to change the diameter of hose nozzle, to adjust the flow rate of bottom flow.Using the technical scheme of the utility model, the bottom flow of hydraulic cyclone can be conveniently adjusted, the turbulent flow is reduced, the wear of bottom flow regulator is reduced, and the risk of blockage is reduced.